Patent ID: 6943276

Claim:
An alkylation process comprising a) alkylating an alkylation substrate with an alkylating agent to form alkylate in a reactor; b) recovering from the reactor a reactor effluent comprising the alkylate and the alkylation substrate; c) flashing a first portion of the reactor effluent to form a refrigerant exchanger feed comprising the alkylate and the alkylation substrate; d) heating at least a portion of the refrigerant exchanger feed in a refrigerant heat exchanger and recovering from the refrigerant heat exchanger a refrigerant exchanger effluent comprising the alkylate and the alkylation substrate; e) passing at least a portion of the refrigerant exchanger effluent to an effluent vapor-liquid separator and recovering from the effluent vapor-liquid separator a vapor phase comprising the alkylation substrate and a liquid phase comprising the alkylate and the alkylation substrate; f) compressing the vapor phase to form a compressed stream comprising the alkylation substrate; g) at least partially condensing at least a portion of the compressed stream to form a condensed stream comprising the alkylation substrate; h) indirectly exchanging heat in the refrigerant heat exchanger from at least a portion of the condensed stream to the at least a portion of the refrigerant exchanger feed to form a chilled recycle stream comprising the alkylation substrate; i) recycling at least a portion of the chilled recycle stream to the reactor; and j) recovering the alkylate from the liquid phase; k) flashing a second portion of the reactor effluent comprising the alkylate and the alkylation substrate to form a recycle exchanger feed comprising the alkylate and the alkylation substrate; l) heating at least a portion of the recycle exchanger feed in a recycle heat exchanger and recovering from the recycle heat exchanger a recycle exchanger effluent comprising the alkylate and the alkylation substrate; m) passing at least a portion of the recycle exchanger effluent to the effluent vapor-liquid separator; n) recovering a substrate recycle stream comprising the alkylation substrate from the liquid phase; o) indirectly exchanging heat in the recycle heat exchanger from at least a portion of the substrate recycle stream to the at least a portion of the recycle exchanger feed to form a cooled recycle stream comprising the alkylation substrate; and p) recycling at least a portion of the cooled recycle stream to the reactor.