Reactor and recovery system for upgrading lower olefins

Details Reactor and recovery system for upgrading lower olefins Reactor and recovery system for upgrading lower olefins

1989-09-29

1991-10-22

Pal, Asok

Chemistry of hydrocarbon compounds

Apparatus considerations

Using recited apparatus structure

585314, 585315, 585316, 585322, 585415, 585533, C07C 212

Patent

active

050597442

ABSTRACT:
An improved olefin upgrading technique and fixed-bed reactor system has been developed for increasing production of premium heavy hydrocarbons, such as distillate fuel, from lower olefinic feedstock. During recovery and recycle of intermediate range hydrocarbons products, a technique has been found for withdrawing a fraction rich in C.sub.5 -C.sub.9 gasoline range olefinic hydrocarbons from the oligomerization reactor effluent stream. By separating the reaction effluent in a multi-stage distillation system, fractionation feed can be separated into a heavier bottoms stream rich in C.sub.10 + hydrocarbons and a light hydrocarbon overhead, while withdrawing a liquid stream as an overflash fractionation stream rich in intermediate hydrocarbons. The overflash stream is combined to form a portion of the recycle stream to the reactor, thereby providing a more efficient and lower cost recovery process.

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