C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 5/27 (2006.01) C07C 9/16 (2006.01) C10G 61/06 (2006.01) C10G 67/06 (2006.01) C10L 1/06 (2006.01)
Patent
CA 2049535
"INTEGRATED ISOMERIZATION AND ADSORPTION STEPS FOR UPGRADING C5 AND C6 HYDROCARBONS" ABSTRACT An integrated combination isomerization and liquid phase adsorptive separation process for C5 and C6 hydrocarbons 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 C5+ 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 the extract stream from an adsorptive separation section to form a combined feed. C5 and C6 hydrocarbons in the combined feed are isomerized and passed directly into the adsorption section. In the adsorption section, normal hydrocarbons are selectively adsorbed on an adsorbent material, and a raffinate stream comprising desorbent and isoparaffins is passed to the deisohexanizer column. A desorbent stream is recovered as a sidecut from the deisohexanizer column and supplies the desorbentfor 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 A bottoms stream comprising C7 and higher boiling hydrocarbons is withdrawn from the bottom of the deisohexanizer column.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.
Haizmann Robert S.
Hibbs Frederick M.
Raghuram Srikantiah
Macrae & Co.
Uop
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