Chemistry of hydrocarbon compounds – Saturated compound synthesis – By isomerization
Patent
1990-07-30
1991-08-27
McFarlane, Anthony
Chemistry of hydrocarbon compounds
Saturated compound synthesis
By isomerization
585738, 585748, 585821, 585826, C07C 513, C07C 712
Patent
active
050435256
ABSTRACT:
A combination isomerization and liquid phase adsorptive separation process is given increased efficiency and cost effectiveness while also improving the product quality by eliminating the columns for the separation of desorbent material from extract and raffinate streams. In this arrangement a C.sub.5 + naphtha stream is split into a heavy hydrocarbon stream comprising normal hexane and higher boiling hydrocarbons and an isomerization zone feedstream comprising isohexane and lower boiling hydrocarbons. The heavy hydrocarbon stream goes directly to a deisohexanizer column. The isomerization zone feedstream is combined with an excess desorbent stream and the extract stream from an adsorptive separation section to form a combined feed. Hydrocarbons in the combined feed are isomerized and after stabilization pass directly into the adsorption section. In the adsorption section, normal pentanes are selectively adsorbed on an adsorbent material, and a raffinate stream comprising desorbent and isoparaffins is passed to the deisohexanizer column and supplies the desorbent for the adsorption section. Any desorbent in excess of that required for the adsorption section is combined with the isomerization zone feed. The extract stream that is combined with the isomerization zone feed is recovered from adsorption section. A bottoms stream comprising C.sub.7 and higher boiling hydrocarbons is withdrawn from the bottom of the deisohexanizer column. A high octane isomerate is taken overhead from the deisohexanizer as a product stream.
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Haizmann Robert S.
Hibbs Frederick M.
Raghuram Srikantiah
McBride Thomas K.
McFarlane Anthony
Phan Nhat
Tolomei John G.
UOP
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