Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1977-12-23
1979-04-10
Crasanakis, George
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07C 354
Patent
active
041488369
ABSTRACT:
An improved process for the alkylation of isoparaffins by olefins in the presence of a sulfuric acid catalyst is disclosed. Improvement in the octane rating of the product alkylate is achieved by the periodic fortification of the sulfuric acid catalyst with sulfur trioxide-bearing fortifying agents and the incorporation of a holding time to delay the return of the fortified acid to the alkylation zone. Fortification is employed less than 6% of the time the catalyst is in contact with the hydrocarbons and a preferred water content of between 1.5% and 2.5% is maintained in the acid. By maintaining an optimum water content and fortifying less frequently, lower water and organic build-up rates are observed than previously thought possible. By incorporation of a holding time before the acid is returned to the alkylation reactor, there is essentially complete utilization of the fortifying agent for water removal and no free SO.sub.3 is available for harmful side reactions with the hydrocarbon feeds in the reactor. When the organic impurities dispersed in the recycle acid are more completely removed prior to periodic fortification, a wider range of SO.sub.3 -bearing agents can be applied than previously thought possible. This nondestructive, periodic fortification process effects improvement in the octane rating of the product alkylate while simultaneously extending the service life of the sulfuric acid catalyst by allowing use of the acid to a higher final organic content.
REFERENCES:
patent: 2071598 (1937-02-01), Girsewald et al.
patent: 2435402 (1948-02-01), McAllister et al.
patent: 2593128 (1952-04-01), Felter
patent: 2863724 (1958-12-01), Skelly et al.
Gancy Alan B.
Karsay Bela I.
Sturtevant Robert L.
Allied Chemical Corporation
Crasanakis George
Hoffman Thomas D.
Stewart Anthony J.
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