×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Question on Splitter Diagram

Question on Splitter Diagram

(OP)
I am working on gaining a better understanding of the operation of towers and am reading through "A Working Guide to Process Equipment".

My question is on the attached photo:

Feed flow rate of 10,000 lb/hr of 90% Water and 10% Alcohol
Heavy flow rate of 9,000 lb/hr of water
Light flow rate of 1,000 lb/hr of alcohol
Reflux flow rate of 10,000 lb/hr

My misunderstanding happens with the feed rate being 10,000 lb/hr and the reflux rate being 10,000 lb/hr. I have limited knowledge of the operation of towers, so this may be a dumb question.

How is the feed rate 10,000 lb/hr and the flow rate leaving the system a combined 20,000 lb/hr?

RE: Question on Splitter Diagram

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Question on Splitter Diagram

(OP)
That's what I'm leaning towards now.

RE: Question on Splitter Diagram

The reflux is not leaving the system. Draw a boundary around the column and only three streams cross the boundary, the feed, lights, and heavies. At SS, In = Out. 10,0000 = 9,000 + 1,000. I see no problems with the diagram.

Good Luck,
Latexman

RE: Question on Splitter Diagram

What type of alcohol - ethanol, methanol or propanol or some other?

RE: Question on Splitter Diagram

In a distillation column, the feed is separated into its components based on their differing boiling points. The vaporized components rise up the column, while the condensed liquid flows downward.

RE: Question on Splitter Diagram

@JD,

Latexman is correct (i dont think the other read your post thoroughly So the reflux is internal and can (in theory) be any fraction of the inlet flow. Reflux is needed for improved separation of the components in the feed. The overhead is vapour (high energy) - energy is removed in the condenser - and by reintroducing this cooled stream back into the top of the column you take away some of the energy (added from the feed and from the reboiler). By cooling the light fraction you will improve separation because the heavy component(s) are more inclined to condense than the light.

Downside - increased energy consumption for cooling and heating.

--- Best regards, Morten Andersen

RE: Question on Splitter Diagram

hi,
On a safety point of view i'm not comfortable with PCV on diaphragm pump,better to add a second dedicated pump.
my view
Pierre

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!