US 5,847,252 AGranted

Process for integrated oligomer production and saturation

AssigneeUop LLC

InventorsLaurence O. Stine, Bipin V. Vora, Harold U. Hammershaimb

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Abstract

A process for the production motor fuel components from isoparaffins by dehydrogenation, oligomerization and saturation uses a combination of low severity dehydrogenation, first and second feed input locations and a primary separation column that receives feed and effluent components to deliver a dehydrogenation zone feed and a motor fuel products. A separation column receives the an isobutane input stream and a product containing effluent stream to distill a dehydrogenation zone input steam. The dehydrogenation zone operates at low severity conditions to produce the effluent stream that compliments the operation of an oligomerization zone by delivering an effluent stream that is higher in pressure and contains inert paraffinic diluent materials. The oligomerization effluent passes to a saturation reaction zone that provides a saturated effluent stream. The saturation zone effluent is divided to provide quench to both the oligomerization reaction zone and the saturation zone and saturated motor fuel components to the separation column.

Claims16

Dependent claims

A process for the production of a motor fuel product from a first isobutane containing input stream and a second olefin-rich input stream, said process comprising:

a) passing at least a portion of said first input stream comprising isobutane and a fraction of a saturation zone effluent stream comprising C4 hydrocarbons to a dehydrogenation zone and contacting C4 hydrocarbons in said dehydrogenation zone with a dehydrogenation catalyst at dehydrogenation conditions including a temperature of 950.degree. to 1200.degree. F. and a pressure of 30 to 150 psig and an LHSV of 0.5-50 and recovering hydrogen and a dehydrogenation effluent comprising C4 isoolefins with a total olefin concentration of less than 35 wt % and at least 50 wt % isobutane;
b) passing at least a portion of said dehydrogenation zone effluent and a second input stream comprising at least 20 wt % normal butenes to an oligomerization zone to supply an oligomerization zone feed having an isobutene to normal olefin ratio of at least 0.35 and contacting said oligomerization zone feed with a solid oligomerization catalyst at oligomerization conditions including a temperature of 200.degree. to 500.degree. F., a pressure of 100 to 1500 psig, and an LHSV of 0.8 to 5 to recover an oligomerization effluent comprising C7 and higher isoolefins;
c) passing at least a portion of the effluent from the oligomerization zone into a saturation zone and passing hydrogen recovered from said dehydrogenation zone into said saturation zone and contacting said oligomerization zone effluent and hydrogen with a saturation catalyst at saturation conditions to saturate olefins in said oligomerization effluent and recovering a saturation zone effluent stream;
d) passing at least a portion of said saturation zone effluent stream to a separation zone;
and
e) recovering a stream comprising said motor fuel product from said separation zone.

3 more elements

Dependencies are inferred from the claim text.