US 5,675,052 AGranted

Hydrocarbon alkylation process

AssigneeThe BOC Group, Inc.

InventorsRaghu Menon, Ramakrishnan Ramachandran, Virginia Malik, Martin Bulow

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Abstract

A hydrocarbon stream is cracked to produce a hot gaseous stream which is compressed and cooled to condense almost all of the hydrocarbons contained in the stream. A noncondensed stream remaining after the condensation step, comprised predominantly of hydrogen and C.sub.1 to C.sub.3 hydrocarbons, is subjected to pressure swing adsorption or temperature swing adsorption at an adsorption temperature of about 0.degree. to about 250.degree. C. in a bed of adsorbent which selectively adsorbs ethene and propene, thereby adsorbing substantially all of the ethene and propene from the gas stream. The ethene and/or propene is recovered upon bed regeneration. Higher alkenes are separated from alkanes by various methods.

Claims31

Dependent claims

A method of producing an alkylate of i-butane and propene, comprising the steps:

(a) subjecting a mixture comprised of propene and propane to an adsorption process using a propene-selective adsorbent, thereby producing a propene-enriched fraction and a propane-enriched fraction;
(b) subjecting a mixture comprised of i-butane and propane to a separation process selected from distillation, adsorption using an i-butane-selective adsorbent, membrane separation using a membrane which is impermeable to i-butane but permeable to propane, or combinations of these processes, thereby producing an i-butane-enriched fraction and a propane-enriched fraction;
and
(c) contacting said propene-enriched fraction with said i-butane-enriched fraction under conditions which effect the alkylation of i-butane with propene.

1 more element

Dependencies are inferred from the claim text.