-
+1 - 312-224-1615
Get in touch with us
-
support@helpwithassignment.com
Send us an e-mail
Solution Library
Use of Carbon Dioxide in Decaffeination Process
Question
Decaffeinated coffee produced using carbon dioxide is often considered to have the best taste. CO2, at 90°C and 250 bar, is fed into an extraction unit where it contacts the green coffee beans, removing most of the caffeine. CO2 at these conditions is an excellent solvent for caffeine and selectively absorbs only caffeine from the coffee beans. The CO2, containing 2.5 weight percent caffeine, is then sent to a caffeine removal unit operation, where its temperature is reduced to 30°C and the caffeine precipitates out of solution and is filtered out. The CO2 is then heated, and recycled back to the extraction unit. A schematic of the process is shown in figure below. Please note that the pressure is approximately constant throughout the process.
a) Draw and label a pressure versus temperature phase diagram for carbon dioxide. Include on the diagram the operating points of both the extraction unit and caffeine removal unit.
b) Why is CO2 at 90°C a good solvent for caffeine but at 30°C is a poor solvent.
c) Determine the flow rate of CO2 (in m3/min) entering the extractor.
Summary
The question belongs to Chemical Engineering and it is about the process of applying CO2 for caffeine extraction from green coffee beans. The solution discusses some variations in the process.
Note: The solution is in handwritten format.
WHAT OUR STUDENTS SAY
I was really nervous about my college application essay for a university in Sydney but luckily I came across HwA and with the help of their wonderful support team, my application essay was highly appraised. Since then I often take help and assistance for my essay writing projects.
Charlotte Johnson Student
Great assistance!!! Thank you guys for all your support. I love the way you dealt with my every instruction and I’m very much satisfied with the work. As I had difficulties managing time for studies and job, you really saved both.
Brendon Student
As an undergraduate statistics student at one of the leading institutes in Singapore I was finding it increasingly difficult keeping up with the assignments with the rest of the class. I was lost, and not in a good way, in probability, displaying data etc. That is when I found TheReliableTutor. Here the stats homework solver helped me out with all my assignments and I have been getting great reviews and grades since then.
Jun Jie Student
I took constant help from HwA for mean, median and mode assignments of random variables and I am very happy with the feedback I get from my professor. The statistics experts at HwA are very helpful and they assisted me to get good grades in all my random variable assignments.
Chris Mathew Student
I always wished to be a tax attorney and my dream has come true with the assistance of HwA. After completing my graduation in law I pursued a master degree on taxation. However, I faced severe problems while dealing with the numerical given as assignments. Then one of my friends suggested about this website and I got wonderful response.
Katherine Jones Student
Comments
this is a very good website
I have 50 questions for the same test your page is showing only 28
hi can you please help or guide me to answer my assignments. thanks
hi can anyone help or guide me to my assignments. thanks
This solution is perfect ...thanks
Hello Allison,I love the 2nd image that you did! I also, had never heard of SumoPaint, is something that I will have to exolpre a bit! I understand completely the 52 (or so) youtube videos that you probably watched. Sometimes they have what you want, sometimes they don't! However, it is always satisfying when you are able to produce something that you have taught yourself. Great job!Debra 0 likes
Perfect bank of solution.
great !
thanks for the quick response. the solution looks good. :)
thnx for the answer. it was perfect. just the way i wanted it.
works fine.