P&IDs and Process Evolution

P&IDs and Process

P&IDs are par for the course in process engineering. Recently, I was poring over P&IDs and process planning for several projects. Each project was multinational, multicultural, and extremely complex. For one specialty chemical filtration application, part of a plant expansion in the southern United States, the engineering company is in the Southeast while the existing processes were from the Netherlands and Austria. In another project, with a similar scope, the plant expansion and the engineering company were both in the Northeast U.S., yet the current processes operate all throughout the UK.

As you can imagine, the piping and instrumentation diagrams (P&IDs) had many changes, each shown in a different color —the Christmas Trees of P&IDs.  There were extensive e-mail threads of comments and questions and, of course, questions/comments about the comments/questions. Plus, the projects required equally fun conference / video calls accounting for time zone differences, various languages and accents, and varied engineering cultures and operating philosophies. You’ve been in this situation too, I’ll bet.

The discussion, though, is invigorating. The idea exchange goes well beyond solid-liquid separation to encompass types of valves, types of pumps, where to put the pumps, how to handle the solids, operator safety, disposal, and on and on and on.  I even had a question about desalination and how to operate the DAF (Dissolved Air Flotation) units (that’s a topic for another blog).

Developing A New Process Path with P & IDs

After one of these calls, I had an “A-Ha” moment about the true value of our plentiful rounds with P&IDs and process. This is where the innovation happens. The P&IDs are idea development in action. This is where we, as I wrote in one of my earlier blogs, clear our path of unknowns.  

Anyone who’s read my blog consistently will recognize this is what is excites me about process engineering and all we do in this role. I’ve decided to take my own early 2019 advice and stretch myself in new directions with the birth of “P&ID-Perlmutter Idea Development” which you can find at perlmutter-ideadevelopment.com.

To me, these two sites work together like a candle filter functions better with the right filter sock. I’m excited to see how this idea develops, and eager to see what my readers, colleagues, and fellow bloggers will want to add and change and discuss (after all, it’s a P&IDs and process we’re talking about here).

Removing Catalyst Fines From Raney Nickel Catalyst Reactions

 

Raney nickel catalysts
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Whether you call it Raney nickel or Raney mud, this alloy of aluminum and nickel is a reagent common to many organic processes. Currently, most Raney nickel catalyst slurries are clarified with the use of manual plate or nutsche filters, bag filters, or cartridge filters. 

Yet any of these approaches require manual operations for cake discharge and cleaning between batches or campaigns. At the same time, they accrue high labor, maintenance and disposal costs  and  expose operators and the environment to toxic and hazardous solvents, solids and contaminated filter tools.  

BHS developed a more contained, cost-effective approach using batch-operated, pressure-filtration systems candle filters. 

A Candle Filter Primer

A candle filter is a pressure vessel filled with tubular filters called candles. The candle is comprised of a filtrate pipe, a perforated core with supporting tie rods, and a filter sock.

The filtrate pipe runs the length of the candle and ensures high liquid flow, as well as maximum distribution of the gas during cake discharge. The tie rods create an annular space between the filter sock and the perforated core, which helps maintain a low pressure drop during operation and promotes efficient expansion of the filter sock during cake discharge. The filter sock, made of various synthetic materials, is installed over the candle and can remove particles smaller than 1 micron (μm).

As the cake builds during operation, the candle filter’s removal efficiency increases, enabling removal of particles as small as approximately 0.5 μm. During operation, pressure from the reactor forces the slurry into the bottom of the pressure vessel. The solids build up on the outside of the filter sock, while the liquid filtrate flows into the candle through the registers and out of the vessel. This process continues until the maximum pressure drop, design cake thickness, minimum flow, or filtration time is reached. 

For concentrated cake discharge, low-pressure gas enters in the reverse direction through the registers and into the individual candles and expands the filter socks. This process breaks apart the cake, which detaches from the filter sock and falls into the vessel cone. The cake is then discharged as a concentrated slurry. 

Raney Nickel Catalyst with Candle Filters for Slurry Discharge

In this application, the current process after the reactor is gravity separation, hydrocyclones and then followed with cartridges and bag filters.  The specification for the process liquid (diamine and water) is less than 3 ppm catalyst.  This recovery process was inefficient and exposes the operators to the diamine and catalysts creating a safety hazard.  The average particle size is 2 um and amorphous crystals.   

Lab testing and pilot testing was conducted to determine a processing scheme that eliminates solvent exposure, reduces the maintenance and operation requirements of the current scheme and recovers the catalyst to less than 3 ppm.  The final design was a BHS slurry-discharge candle filter with 19 m2 of filtration area. 

Candle Filters for Raney nickel Slurry Discharge

BHS developed this approach working with a client whose process after the reactor included gravity separation, hydrocyclones, then followed with cartridges and bag filters. The specification for the process liquid (diamine and water) was less than 3 ppm catalyst. The average particle size was 2 um and amorphous crystals. Yet, this recovery process was inefficient and exposed operators to the diamine and catalysts, which created a safety hazard.  

BHS conducted lab  and pilot testing to determine a processing scheme that eliminated solvent exposure, reduced maintenance and operation requirements, and recovered the catalyst to less than 3 ppm. The final design was a BHS slurry-discharge candle filter with 19 m2 of filtration area. Learn more about this application in this article.

Troubleshooting When the Filtration System is Not Working

 

filtration system
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These are five dreaded words that no engineer wants to hear on a Saturday night or Sunday morning: “The filtration system is not working.” Of course, we never seem to get this call at 10 in the morning on a work day!

No matter the time of day, let’s not panic, take a deep breath and begin the analysis.  

There are normally three main areas that must be examined when you learn the filtration system is not working:

  1. The filter itself for mechanical reasons
  2. The equipment around the filter is not working
  3. The filter operational procedures are not correct.  

To fully understand the problem, it’s necessary to separate the symptoms from the causes. So, let’s examine each of these groups in more detail.

Troubleshooting Filter Problems

The first thing that should be checked is the filter itself. There could be a failure of the equipment mechanics such an internal components, seals, etc. Many of these issues will be described normally in the preventative maintenance section of the filter’s O & M manual. 

Second, keeping in mind, the filtration system is part of the entire process it’s important to examine the upstream and downstream equipment. For example, you might check:

  • Are the reactors performing correctly in terms of agitation, temperature control, etc. in order to produce the specified crystals?  
  • Are the precoat and body feed systems in tune for mixing, feeding, flow rates, solids loading, etc.?  
  • Are the valves and instruments operating correctly and reading the correct variables (calibrations), etc.?  

Next, take a look at the pumps that feed the slurry and washing liquids as well as the compressors the feed the gas streams for drying and cake discharge.  The pumps must produce the required pressure, flow rates, etc.  The compressors must also produce a certain gas flow at a specific pressure for a certain amount of time.  Are their interlocks in the control system or a control communication problem that are not being recognized that are causing the filter problem.  Finally, if flocculants and chemicals are being used, have these changed?  

Process Engineering Problems? 

The last place to look is the process or operational procedures. These could be responsible for the filtration problems.  For example, the particle size distribution may have changed, the amount of solids in the slurry may have changed, the cake compressibility may have changed, etc.  In terms of the operation, has the filtration pressure changed, timers changes, speed changed, etc.?  Finally, determine whether or not a process parameter has changed.  

Trouble shooting is not easy, but solving the problem brings a great sense of satisfaction. 

Let me know some of your troubleshooting horror stories! I’d love to share some in a future blog. Together, we can make it easier to handle the situation next time we hear those five dreaded words.  

filtration system
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What Are Process Engineering Responsibilities in Technical Sales

technical sales description
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With graduation season coming there will be many chemical engineers on the market looking for their first jobs.  There are many opportunities with operating companies, engineering companies, startups, venture capitalists (yes, engineers in the financial industry), and consulting firms. Nevertheless, my first choice is sales, so let’s flesh out a technical sales description.

Why technical sales? It’s an interesting field for process engineers for several reasons as you get the opportunity to:

  • Combine technical expertise with people skills  and business knowledge to help customers solve problems
  • Define customer’s technical requirements
  • Explain, test, and demonstrate the company’s products to meet the requirements and solve the customer’s problems
  • Employ a flexible approach to technical/commercial situations
  • Interact with a variety of people and positions

The best process engineers for technical sales possess a desire to get involved in the business aspects of many different industries/application and are willing to cultivate long-term selling relationships with varied types of people.

But Will I Still be a Process Engineer?

In school you learned all of the technical skills. Now, in technical sales, you use all of your process engineering skills. How so?

  • Selling requires logical analysis and documentation to the client to make them feel comfortable with the product
  • Performing calculations allows you to be successful in risk taking and feel confident in your decisions
  • Continuing to trouble shoot the process and solve difficult problems even after you have sold the equipment

Graduating with the technical skills under control, there are certain attributes that can help you transition to a technical sales role as a process engineer. Those looking to hire you for technical sales will want to see:

  • Are you a good listener?
  • Are you motivated?
  • Do you have thick-skin so that if the client is not satisfied you can accept criticisms?
  • Can you be part of a team?
  • Are you a good writer?
  • Do you like to be in front of people making presentations?
  • Are you both curious and creative?

My Path to Technical Sales

I embarked on this career path with degrees in chemistry and environmental science and technology.  I joined the US Environmental Protection  Agency in 1976 when we were a young agency.  I did air sampling (clean shaven and no beard) and rule development and was able to learn about many industries and applications.  After getting by MBA at night (over four long years), I joined Pall Corporation in technical marketing.  This role was fun, creative but now here I am working with BHS-Sonthofen. Some 35 years later, technical sales and marketing are ingrained in my psyche.

Know that you have my thoughts on shaping a technical sales description, let me know if I can help you with your career decisions and training.  Good hunting.

Chemical Process Optimization needs Out of the Box Thinking

chemical process optimization
A continuous vacuum belt filter with 9.0-m2 filter area.

Loyal readers of this blog know how much I value innovation and creativity. So, you can’t be surprised that I want to share with you a chemical process optimization success story. We partnered with a client to develop an optimized filtration process for a zinc oxide product.

As discussed in a coauthored article for Chemical Processing, Madison Industries and BHS-Sonthofen Inc. worked together on laboratory and field pilot testing. Engineers from both firms showed creativity and “outside-the-box” thinking in looking at the process from new vantage points in their quest to find a better option than the installed batch filter press.

Our efforts led to the selection of continuous vacuum filtration. The continuous filter, which was installed in 2016, provides maximum filtration efficiency and improves product quality while increasing yield and reducing operating and maintenance costs.

chemical process optimization
Figure 1. Technology, based on fixed vacuum trays, features step-wise movement of filter media.

Case Background

Madison Industries, based in Old Bridge, N.J., supplies copper and zinc compounds such as copper sulfate, copper carbonate, zinc sulfate, zinc chloride, zinc orthophosphate and phosphoric acid as well as other chemical products containing copper and zinc. Applications include animal feed, water treatment, dairy farming, food and pharmaceutical processing, and pool and wood preservative chemicals, among others.

The Madison facility was using a plate-and-frame filter press to filter a zinc oxide slurry made from a mix of various zinc feedstocks. The solids were mixed with water to form a slurry of 20% solids and then filtered. The cake was bagged in 2,000-lb totes, moved to another area of the plant and reslurried in sulfuric acid for further processing.

Madison wanted to expand production and replace the present labor-intensive process with a continuous operation — this led to chemical process optimization.

Crucial Tests

BHS process engineers began laboratory evaluation of the process. Madison was open to all ideas and formed a team to brainstorm different approaches.

BHS conducted several weeks of testing and evaluated both pressure and vacuum filtration based upon the specific characteristics of the solids and slurries. The testing led to the following observations:

• Filtrate clarity: The most-appropriate filter cloth is a double-weave 12-micron polypropylene.
• Filtration rate: Vacuum filtration produced the maximum filtration flux rate at a cake thickness of 6 mm.
• Cake washing: Maximum displacement washing was achieved with wash ratios of 2.6:1.
• Cake moisture: Although not a critical parameter because the cake is reslurried, cake moisture is approximately 35%.

Based on its creative testing, BHS’s process engineers recommended continuous-indexing vacuum filtration as the optimum option.

Why Continuous Indexing

The BHS continuous-indexing vacuum belt filter provides for vacuum filtration, cake washing, pressing and drying of high solids slurries. The technology is based upon fixed vacuum trays, a continuously feeding slurry system and indexing or step-wise movement of the filter media (see Figure 1). In practical terms, the belt filter operates similarly to a series of Buchner funnels.

At each indexed belt position, washing and drying efficiencies are maximized with the stopped belt and the mechanism of plug flow for gases and liquids. Cake pressing and squeezing further enhance drying. Finally, the fixed trays allow for the mother liquor and the wash filtrates to be recovered individually and recirculated/recovered/reused for a more efficient operation. The design also can integrate steaming as well as counter-current washing.

Successful Switch

Madison and BHS installed the vacuum belt filter in 2016. The unit has met all product quality specifications. Madison has realized a 50% savings in wash liquids per batch as well as a reduction in labor and operating costs because the vacuum belt filter operation is fully automatic. Since the installation, Madison has optimized the operation, improving yields and minimizing costs.

The Madison and BHS collaboration illustrates a successful relationship between client and technology supplier. The BHS approach of lab and pilot testing, coupled with idea-generation, fosters identifying the optimal option for critical and difficult solid/liquid separations.

Selecting the Right Types of Filtration for Solid-Liquid Separation

types of filtration
Photo by Picturepest on Foter.com / CC BY

Filtration selection, if we think back to Sherlock Holmes, means “not jumping to conclusions.”  There is no “one size fits all” process solution.  Selecting a filtration technology requires a systems approach incorporated with other solids processing such as reactors, dryers, solids handling, etc.  You could gain an objective overview by filling out an application data sheet (like the ones I use for new or existing applications) that can help identify what’s involved in the specific solid-liquid separation.

Ultimately, the process has three components:

  • Material properties, which I’ll describe in more detail below
  • Separation performance objectives including, for example, filtrate quality (conductivity or residual solids) cake dryness, flowability of the cake, crystal breakage /fines generation and conditioning of the cake for further processing
  • Mechanical properties — The specification must be clear in terms of material of construction, temperatures/pressures, FDA validation, cleaning procedures, manufacturing codes, etc.  Each equipment type will have its own mechanical specifications that must be satisfied.

These three considerations are combined and ranked choices are then evaluated for operational, economic, and plant (internal and external) objectives.

Finding the Best Filtration Procedure

Your examination of material properties considers the solids and the liquids.  For solids, the engineer needs to know the total suspended solids (TSS) and solids concentration, particle size distribution (PSD), and particle shape.  The PSD should be based upon particle counts at different sizes rather than by weight or volume.

The particle shapes can vary:  spheres, rounded, angular, flaky, or thinly-flaked are among the examples.  Shape will influence the filtration rates for the process and also impact the PSD due to the nature of particle size measuring equipment.

Knowing this, the solid-liquid filtration system further requires a systems approach to incorporate other solids processing such as reactors, dryers, and solids handling, etc.  The full scope should include the actual upstream and downstream.

Consider this typical example of a chemical process including all of the associated processing steps:

  • Chemical synthesis and Crystallization:
    • Types of catalysts
    • Solvents
    • Continuous or batch
    • Temperature
    • Flashing
    • Inerting
  • Filtration
  • Drying
  • Dissolution
  • Hydrogenation
  • Secondary crystallization
  • Filtration
  • Final drying
  • Solids and slurry handling in all steps

General Guidelines to Selection

So, the question is where to begin to make the preliminary filtration technology choices for solid-liquid separation?  Here are some general guidelines for selecting among types of filtration:

Filter Press Continuous Vacuum and Pressure Nutsche  Filter & Filter-Dryer Clarification
Solid content of the suspension (%) 5 to 30 10 to 40 10 – 40 < 5
Maximum Pressure Difference 100 bar -1 to 6 bar 6 bar 10 bar
Cake Thickness (mm) 5 to 50 5 to 150 5 to 300 20
Average Particle Size 1 to 100 micron 1 to 100 micron 5 to 200 micron 1 to 50 micron
Type of Operation Batch Continuous Batch Batch
Comments Good for slow filtration and can produce dry filter cakes; Excellent cake washing and pre-drying Good when reactor batch times equal to total cycle times Disposable for low flows; candle and plate filters for large flows

Let me know if this is helpful to you.  My idea is to do a series of types of filtration systems for solid-liquid separation for various applications.  What is troubling you?

Reflecting on Speed, and Time to Prosper

process engineering

Welcome to 2018.

What do “Star Wars — The Force Awakens,” the New England Patriots and the Kansas City Royals and this blog all have in common?  As you might have guessed, they all had special events in 2015.  Yes, my blog has been up and running now for over three years! Plus, 2015 is when Star Wars debuted and both New England and Kansas City won their respective championships.

Before thinking about 2018, and this blog’s fourth year, I wanted to take a moment to reflect on the year 2017.  What intrigues me is what we know now that we did not know in January 2017, one year ago. There were many surprises ranging from politics, world events, social issues, to business and career, sports, food and entertainment.  In the comments below, let’s start a conversation about what you learned in 2017.

Reflecting on 2017 and 2018 Success

Of course, I have many ideas about what I learned last year. Yet, in boiling it down to one theme, I would focus on “speed.”  In all of our endeavors, the speed of information flow, decision making, world events, politics, etc., is increasing dramatically.  From a business point of view, technology, marketplace, competition, manufacturing, etc. are all changing at breakneck speed.  At BHS, for example, we addressed a marketplace request to incorporate “clean-in-place” (CIP) systems which led to changes with our rubber belt filter.

At the same time, if speed is what characterized 2017, for 2018 I’ve decided it’s time to slow down and reflect. For one thing, I have improved my yoga practice. In other areas of my day, I’m taking the time needed to review facts and data, analyze decisions, gather inspiration from many sources, and finally proceed with definite actions. Of course, I still need to be ready to change, as things will continue coming at “breakneck speed,” but I am optimistic about success.

For 2018, I’ve already started thinking with excitement about what posts my readers want to read.  There will be more blogs about “problem-solving” with topics on filtration, particle technologies, drying, and solids handling.  Yet I always invite you to make suggestions! In fact, I’d welcome guest blogger contributions to improve the chemical process industry.  Finally, read often, thick critically, and let’s all prosper in 2018.

The Technique of Technical Writing

technical writing skills
Image source: Foter.com

I challenge you to think of a job in which communication skills won’t increase your chances of success. Even zoo keepers working with other species benefit from communicating non-verbally with the lions, tigers, and bears (oh my!) in their care.

In our engineering/business careers, technical writing skills are an even more important subset of communication, and highly valuable. If you follow this blog regularly, read the BHS newsletter or visit our website, you know already how much I enjoy writing and communicating ideas to the marketplace.

To me, while we may call ourselves engineers and professionals, we are also technical writers. All of us craft e-mails, white papers, reports, proposals, justifications, etc. Thinking about this made me want to share some of my thoughts on clarity of communication (with an appreciative ‘I’m not worthy’ nod to all the editors, some of whom I count as friends, of engineering magazines who have studied technical writing / journalism much more closely than I have).

Consider Your Audience

What language are you using? I do not mean to ask whether you’re utilizing a foreign language. Rather, are you employing the language of your audience? For example, many words are relative and they reflect the experience of the writer. Consider for instance the word “large.” What is a large motor, large pipe diameter, or large filter area? The answer depends upon the marketplace, application, place in the world, company, etc. A large motor for a pharmaceutical engineer is much different than for the engineer working in a refinery.   A large filter area is different in the mining industry compared to a specialty chemical. Or what about the word “high”? Think about all of the ways this one word is used…high cost, high efficiency, high pressure, high temperature….I could go on and on.

Going further, when we look at language, we should also look at our own company’s languages. Every vendor, every client, and every software device has its own acronyms and code words. It is like the United Nations without the use of the headphone translations.

Ultimately, clear and concise writing can prevent a safety accident, make a project proceed better, reduce the need for calls in the middle of the night to the process engineer (or worse to the vendor) and improve overall satisfaction. Take care with your writing.

Principles for Better Writing

How do we get better at writing? Write often. Read a lot (you’re off to a great start subscribing to this blog!). I also try to focus on the following:

  • Accuracy — Don’t get caught up in impressing people will all that you know about a subject. Instead, pay attention to accurately communicating the essential information.
  • Write to the audience — You draft for you. You revise for your audience. Always look at what you have written with fresh eyes to consider what will make sense to the person reading.
  • Conversational — Technical writing doesn’t need to be bogged down with jargon. Everything is more interesting to read when the reader is engaged in the story you are trying to tell.
  • Clear and concise — Don’t try to impress people with multisyllabic words and quotes from great classical minds. Cut the excess in favor of getting right to the point and staying there for only as long as you need — no longer.
  • Simple — There are many complex concepts we address every day in our professional lives. That’s what keeps it interesting in the office, right? Only you needn’t share all of the nuances with your reader. The job of the writer is to process the information and identify the main point and important takeaways. Do the thinking first and then share your simple observations in your writing rather than rambling on at length about all of the options you might have considered.

These are the techniques that I focus on in my writing. I hope that you’ll see my blog follows these principles.

Have you had any specific experiences or funny experiences where “language “has been confusing? Let me know. I’d love to follow this blog up with one sharing amusing stories from our field.

Get Out There and Learn!

Genchi Genbutsu
Photo credit: NASA Goddard Photo and Video via Foter.com / CC BY

Years ago, when I was an MBA candidate at the University of Illinois, we were introduced to the MBWA (Management By Walking Around) principle. In Japan, the principle is known as “Genchi Genbutsu.” Toyota, in particular, is known for this “actual place, actual thing” philosophy. Ultimately, in all aspects of engineering — from operational efficiency to process development to system dynamics — this “go and see for yourself” approach is worthy of discussion. No matter how good the information may seem to be, firsthand knowledge is fundamental.

My experience is as a technology supplier, but this action-oriented principle equally applies to the production and processes of our clients. For example, we have a pharmaceutical client that moved from batch processing to continuous processing with BHS technology. The process engineer may be satisfied that the client’s goals and objectives were achieved. However, we insist the next step is to “go see ourselves” and observe the operation. What are the machine efficiencies? Is the design easy to operate and maintain? What is the operator mindset?

In another case, involving a commercial scale-up of a new chemical process, we must know the catalyst; how the scale-up is planned…step-by-step or full in; sequential or parallel technologies…vacuum or pressure; options and costs; and finally value-engineering. The best way for BHS to meet the scale-up needs is to follow the approach of “seeing for ourselves.”

Always be Learning

In looking to always be learning how to best serve customer needs, we also incorporate Jay Forrester’s system dynamics. This technique of feedback and impacts considers questions such as: How does the competition react? What are the consequences — intended or unintended?

Although system dynamics had its beginnings in the physical realm, this method of thinking has moved to areas such as leadership, operational structure, interactions of variables and making decisions for how things are changing for the future. This is easily applied to chemical engineering where “gifted all-arounders” are preferred in a world of increasing complexity.

This idea of Genchi Genbutsu, exploring a system fully, aiming to truly understand the actual thing functioning in the actual place can greatly impact learning. It poses interesting questions too: How would a car company make pills? How would a chemical company make water bottles? How does a CEO of an airplane company succeed in begin a CEO of a car company? And so on.

Learning in one field can become applicable to others. This blog invites readers and followers to share experiences and improve engineering and innovation processes. Let’s keep this conversation going.

Innovating Zero Gravity Espresso

chemical engineering problems
Image source: foter.com

Ambition to improve is everywhere, and not only limited to corporate labs and academia. I love to see examples of innovation in any field — from wind turbines to cloud seeding or surfing to strawberries. Those who are loyal readers of this blog know that I’ve already written about each of those. Today though I am turning to some new tech that relates to what we do every day to solve chemical engineering problems.

Despite what contrarians might say, humans long ago solved the mystery of making perfect coffee on earth. Yet building an espresso machine for the international space station was a much bigger challenge. Bloomberg last year featured an Italian engineering firm, Argotec, spent over 18 months with 11 engineers working to develop a microgravity brewing process that could meet NASA’s rigorous safety standards.

In Earth gravity, we force almost boiling water through finely ground coffee beans. The water boils, becomes less dense and the steam pushes into the air above. But hot water behaves differently in near-zero gravity. The steam does not rise; staying put it can create a dangerous vapor bubble suspended in a ball of water. So, to avoid bubbles, Argotec used a special thin-steel pipe to ensure the water couldn’t build up heat bubbles.

The next problem was pressure. NASA safety rules anything over 60 psig a concern. Espresso brewing requires at least twice as much pressure. Argotec engineers determined that they could address this by eliminating a traditional rotary pump and instead using an electric motor to drive the plunger.

What about leaks and pressure relief? This is a common problem for all chemical plants, but even more difficult in zero gravity. Argotec made it so that every piece of pipe had relief valves with piping back to a central pressure containment chamber.

 

That left the question of how to drink an espresso in outer space? Think, after all, of the Tang crystals that are so famous as a space drink. The espresso-loving engineers designed a mechanism to blow air through the coffee capsule into a zip-lock coffee cup.

chemical engineering problems

We all know how nice it is to have a hot espresso when trying to solve a process-related chemical engineering problem. Now our astronauts have the same opportunity to get the brain cells jumping in space. This is yet another exciting example of how process engineers have to brainstorm new approaches to separation problems.