Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • 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.

Students Click Here

Grease to Diesel

Grease to Diesel

Grease to Diesel


I am new to this forum and is not expert at all regarding petroleum engineering. Somebody told me that diesel can be made from Grease by adding sulfuric acid to it. Is it correct? If yes then is it viable at large scale. Is it legal?

He told me that one of his friend is doing this business and processing 4000 drums per month. He is using Irani Calcium Grease and using so called chemical H2SO4 (Sulfuric Acid) and getting 90% diesel and 10% waste.

I would like to educate myself about this process and its technicality.


RE: Grease to Diesel

Amazngly enough it seems to be true

See http://www.extension.org/pages/28000/used-and-wast... and follow the links under acid pre-treatment

As usual it is a bit more complex and time consuming (mixing period is days not hours)than might first appear....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: Grease to Diesel

If you're making biodiesel from calcium soap and sulphuric acid, you're missing a reagent- methanol.

If you're just interested in making stearic acid or mixed free fatty acid, that's not anywhere nearly what a person would call diesel, though you can probably run a diesel engine on it- if you keep it melted...

RE: Grease to Diesel

This kind of way to to make biodiesel are not new at the moment we have an unit which is processing biodiesel from animal fat.

RE: Grease to Diesel

"Acid ptretreatment" for feeds with high free fatty acid content is definitely not new. But the process is still esterification with methanol, not just acid hydrolysis of a soap/grease.

RE: Grease to Diesel

If mixing this material is the limiting factor in productivity, then there are a very few mixing setups that can move thick material around efficiently. Maybe only one. Invest in a mixing expert and lab time if this needs to be viable, as the difference between optimal and suboptimal mixing can be orders of magnitude.

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.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


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
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’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:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close