×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Alky Unit

Alky Unit

Alky Unit

(OP)
Dear all

In our refinery as I suppose in many other refineries we are short for i-C4 as feed to alkilation unit. As I know for C4 alkylation unit, ratio of C4 olefins an i-C4 is about 1:1.2 respectively. And we run our alky unit in that manner, it is sulphuric acid alky unit.

During discussion with some of my colleagues they mentioned that is possible to run alky unit with ratio C4= to i-C4, 1 : 0.9 respectively. In my opinion it is not possible, because if we have ratio 1 : 0.9 we will consume i-C4 cooling media, and i-C4 recycle from disobutaniser column.

Is it possible to run alky unit with ratio 1:0.9?

Regards,

Milutin

RE: Alky Unit

The normal practice is to consume almost all of the olefin in the alkylation reaction.  Therefore, the iC4 is always comfortably in excess of the stoichiometric ratio.  The excess iC4 is recycled.

Recall that the iC4 in the feed is usually not 100% pure - it comes with some nC4 which goes straight through the reactor.  Generally, the nC4 is separated, but not completely, from the iC4 recycle in the deisobutanizer column.

I have never seen a C4-/iC4 ratio less than about 1 : 1.10

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!


Resources