olefin in reforming product

[Nagara]

Recently we noticed that our feed-effluent exchanger, prior to our reforming reactors, has a leak. We were told that in order to quantify this leak we could measure naphtenes in the products, as their conversion should be 100% at the severity we are operating. Product PIONA shows that naphtenes conversion is 94% aprox.However, we noticed also that the olefin level in the product is 2% (used to be 0 or 0.0009%), and our feedstock has not changed. This phenomena can not be related to the leak, but we do not know why we are producing olefin in our reactors......

 

[25362]

Nevertheless, have you checked the olefin content of your feedstock ?

 

[Milutin]

Negara

Olefin content is dependent on reactor temperature, as cycle goes to EOR you increase temperature to keep target octane number, and olefin content goes up.

Regards,

 

[Nagara]

Olefin content of the charge is 0, as it comes from an hydrotreating unit. There was no increase in reactor temperature when olefin content went up. We also noticed that in the same period, naphtenes conversion went down by 3%.
I hope this helps to clear out my question.

 

[Petro0707]

have you noticed any sulfur content went up ? because due to increase in sulfur content will also lead to increase in olefin in the product or overcracking will lead to more olefin in the product.

 

[25362]

You may find interesting reading material in

http://patft.uspto.gov/netahtml/PTO/srchnum.htm

by printing 4193895 under the heading Query.

 

[epoisses]

Nagara
what carbon number are the olefins found by PIONA?
what happened to H2 and liquid yields?
what kind of reformer is it?