Continuous cyclic process for alkylation of hydrocarbons

Details Continuous cyclic process for alkylation of hydrocarbons Continuous cyclic process for alkylation of hydrocarbons

1979-06-11

1981-04-07

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Saturated compound synthesis

By condensation of a paraffin molecule with an olefin-acting...

585731, C07C 258

Patent

active

042608465

ABSTRACT:
An improved cyclic process for the alkylation of isoparaffins with olefins in the presence of a circulating concentrated sulfuric acid catalyst is disclosed. Improvement in the octane rating of the product alkylate is achieved by periodic fortification of the sulfuric acid catalyst with a sulfur trioxide-bearing fortifying agent under conditions wherein the harmful effects caused by contact of the sulfur trioxide with the hydrocarbons in the alkylation zone are minimized. The acid catalyst is fortified during less than about 15% of the cycles of the circulating acid catalyst through the alkylation system to maintain the water content of the acid catalyst in the range of above about 1% and below about 4% by weight. The process effects not only essentially 100% utilization of the fortifying agent for water removal but also improves the octane rating of the product alkylate while simultaneously extending the service life of the acid catalyst by allowing use of the catalyst having higher organic content.

REFERENCES:
patent: 2435402 (1948-02-01), McAllister et al.
patent: 2437091 (1948-03-01), Goldsby et al.
patent: 4148836 (1979-04-01), Sturtevant et al.

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