Alkylation process utilizing plural olefinic reactants

Details Alkylation process utilizing plural olefinic reactants Alkylation process utilizing plural olefinic reactants

1978-05-09

1980-07-22

Crasanakis, George

Chemistry of hydrocarbon compounds

Saturated compound synthesis

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

585723, C07C 354

Patent

active

042141150

ABSTRACT:
A cyclic system for the alkylation of an isoparaffin, e.g., isobutane, wherein a first olefinic reactant, e.g., butylene, is used to alkylate the isoparaffin for a first period of time in an alkylation reactor and then a second olefinic reactant, e.g., propylene, is used to alkylate the isoparaffin for a second period of time in the same alkylation reactor. During the period that the isoparaffin is alkylated with the first olefinic reactant, the reactor effluent stream is continuously separated into a liquid hydrocarbon phase comprising alkylation products and unreacted isoparaffin and a liquid acid alkylation catalyst phase. The acid catalyst is continuously recycled to the reactor and the hydrocarbon phase is passed to a first surge zone or holding tank. During the second period of time, the isoparaffin-rich hydrocarbon phase from the first surge zone and the second olefinic reactant, along with continuously recycled catalyst, are charged to the same alkylation reactor so that, preferably, feed to the reactor is continuously effected. The reactor effluent is continuously separated into a liquid hydrocarbon phase containing unreacted isoparaffin and a liquid catalyst phase. The hydrocarbon phase is charged in part to fractionation and in part to a second surge zone. During the first period of time, hydrocarbon from the second surge zone is charged to this fractionation so the fractionation is continuously in operation. Isoparaffin is continuously removed from the fractionation to a third surge zone. Isoparaffin can be charged from the third surge zone to the alkylation reactor.

REFERENCES:
patent: 3780131 (1973-12-01), Sobel

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