3 replies to this topic

[Milutin]

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.
What is your opinion?

Regards,

Milutin

[npopov]

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.
What is your opinion?

Regards,

Milutin

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[Zauberberg]

To bypass the deisobutanizer tower - but where? As you know, you can't send unstabilized alkylate to storage tanks. I'm not sure if I understood your post, and I am very much interested if you can elaborate a little bit further on the topic.

Best regards,

[Milutin]

As I understand Mr. npopov, deisobutaniser feed can be bypassed and bypassed stream can be sent only back to reactor, because of high concentration of isobutane and n-butane.
But in my opinion this will not solve problem if concentration of i-C4 on unit inlet is less than normal (C4= to i-C4 1:1.2).

Regards,