A process for the production of motor fuel product components from an isobutane- containing feed stream, said process comprising:
- a) passing said isobutane feed stream and a recycle stream comprising C.sub.4 hydrocarbons and motor fuel products to a deisobutanizer column;
- b) recovering a dehydrogenation feed comprising at least 80 wt % isobutane from said deisobutanizer column;
- c) combining said dehydrogenation zone feed with a hydrogen stream to produce a combined dehydrogenation zone feed having a hydrogen to hydrocarbon ratio of 0.1 to 4;
- d) passing said combined dehydrogenation feed to a dehydrogenation zone and contacting the dehydrogenation zone feed with a dehydrogenation catalyst comprising a platinum, tin and potassium metals on an alumina base at dehydrogenation conditions including a temperature of 1100.degree. to 1200.degree. F., a pressure of 5 to 150 psig and a LHSV of 10 to 50, and recovering a dehydrogenation effluent comprising isobutene and hydrogen;
- e) compressing said dehydrogenation zone effluent stream to a pressure of from 450 to 600 psig in a compressor to produce a compressed effluent;
- f) passing at least a portion of said compressed effluent to a first separator and recovering from said first separator a hydrogen stream having a purity of at least 80 mol % and a dehydrogenated fraction comprising C.sub.4 olefins and paraffins in a liquid phase;
- g) passing said dehydrogenated fraction to an oligomerization zone without further compression, contacting said oligomerization zone feed with multiple beds of a solid phosphoric acid catalyst at oligomerization conditions including a temperature of 200.degree. to 500.degree. F., a pressure of 400 to 600 psig, and an LHSV of 1 to 4, and injecting a first quench stream comprising C.sub.7 and higher paraffins into said multiple beds to produce an oligomerization effluent comprising C.sub.8 isoolefins;
- h) passing a portion of said hydrogen stream to a hydrotreating reaction zone without further compression and passing said oligomerization zone effluent stream without separation into a hydrotreating reaction zone comprising multiple beds of a solid hydrotreating catalyst to saturate olefins and obtain an essentially complete saturation of said C.sub.8 isoolefins, injecting a second quench stream between beds of said hydrotreating catalyst and recovering a hydrotreated effluent stream;
- i) passing at least a portion of said hydrotreated effluent stream to a second separator to separate a heavy hydrocarbon stream comprising C.sub.7 or higher hydrocarbons and supplying said first and second quench streams from a first portion of said heavy hydrocarbon stream;
- j) passing a second portion of said heavy hydrocarbon stream to said deisobutanizer column as said recycle stream;
- and
- k) recovering a bottoms stream comprising said motor fuel product components from said deisobutanizer.