FIELD: chemistry.
SUBSTANCE: invention relates to versions of an alkylation method, one of which involves: a) alkylation of an alkylation substrate in form of paraffin hydrocarbons with 4-6 carbon atoms using an alkylating agent in form of olefins with 2-6 carbon atoms, with formation of an alkylate in the reactor; b) extraction of an exhaust stream from the reactor, containing alkylate and alkylation substrate; c) flash evaporation of at least part of the exhaust stream of the reactor with formation of supply for a heat exchanger with coolant, containing alkylate and alkylation substrate, where the supply for the heat exchanger with coolant has the same composition as at least part of the exhaust stream of the reactor; d) heating at least part of the supply for the heat exchanger with coolant in the said heat exchanger and extraction from the heat exchanger with coolant of an exhaust stream formed by the supply for the heat exchanger, which contains alkylate and alkylation substrate; e) passing at least part of the exhaust stream from the heat exchanger to a separator for separating liquid phase of the exhaust stream from vapour and extraction from the separator of a vapour phase which contains alkylation substrate, and a liquid phase which contains alkylate; f) compressing the vapour phase with formation of a compressed stream which contains alkylation substrate; g) at least partial condensation of at least part of the compressed stream with formation of a condensed stream which contains alkylation substrate; h) indirect heat exchange in the heat exchanger with coolant from at least part of the condensed stream to at least part of the supply for the heat exchanger with coolant, with formation of a cooled return flow which contains alkylation substrate; i) returning at least part of the cooled return flow into the reactor, and j) extraction of alkylate from the liquid phase.
EFFECT: returning light components such as hydrogen chloride and prevention of loss of hydrogen chloride without excess expenditure on compression.
12 cl, 2 dwg
