US 4,008,290 AGranted

Cumene production

AssigneeUop LLC

InventorDennis J. Ward

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Abstract

A process to reduce utility consumption in the catalytic alkylation of benzene with propylene to form cumene. Propylene and benzene are reacted in an alkylation reaction zone, the effluent of which is divided into two portions, the first being recirculated to the inlet of the reaction zone and the second being passed into a separation zone wherein cumene product, di- and triisopropylbenzene and excess benzene are separated. A portion of the excess benzene is recycled to the inlet of the alkylation reaction zone, and a second portion is admixed with di- and triisopropylbenzene and passed into a transalkylation zone, the effluent of which is introduced into the separation zone. Utility consumption is reduced compared to prior art processes, as a result of a reduction of the portion of excess benzene separated and recycled to the alkylation reaction zone.

Claims11

Dependent claims

A process for the production of cumene which comprises the steps of:

a. reacting propylene with an excess of benzene in the presence of an alkylation catalyst at alkylation reaction conditions in an alkylation reaction zone;
b. dividing the total liquid effluent of said zone into at least two portions of like composition;
c. recirculating one of said portions of the effluent to said reaction zone;
d. introducing another of said portions of said effluent and a transalkylation zone effluent stream, formed as hereinafter set forth, into a separation zone;
e. separating from the admixed effluents in the separation zone a benzene-rich stream, a cumene product stream and a di- and triisopropylbenzene-rich stream;
f. transalkylating the last named stream with benzene in the presence of a transalkylation catalyst in a transalkylation zone to form additional cumene;
g. supplying the effluent of the last mentioned zone to said separation zone as said transalkylation zone effluent stream;
h. passing at least a portion of said benzene-rich stream from the separation zone to said alkylation reaction zone;
and
i. recovering said cumene product stream from the separation zone.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/678,005Filed 19 Apr 1976 · continuation in part
Priority: 10 Mar 1975
Granted: 15 Feb 1977
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

C07C 15/085
Monocyclic hydrocarbons: isopropylbenzene
C07C 2/70
Catalytic processes: with acids
C07C 6/126
Of exclusively hydrocarbons containing a six-membered aromatic ring: of more than one hydrocarbon
C07C 2527/173
Phosphates or other compounds comprising the anion -: phosphoric acid or other acids with the formula Hn+2PnO3n+1