METHOD FOR SEPARATION OF COMPONENTS IN AZEOTROPIC OR AZEOTROPE-LIKE MIXTURE, AZEOTROPIC AND AZEOTROPE-LIKE MIXTURES FOR SEPARATION, EXTRACTIVE DISTILLATION SYSTEM FOR SEPARATION OF AZEOTROPIC OR AZEOTROPE-LIKE MIXTURE

摘要

FIELD: technological processes.;SUBSTANCE: invention relates to method for separation of components in azeotropic or azeotrope-like mixture, which represents a flow outging from polymerisation reactor, including contact of extractant, including at least one hydrocarbon with mixture, containing at least one C₄-C₇isoolefin and dissolvent, including one or more fluorohydrocarbons, to produce a product of contact, which represents a dissolvent, including one or more fluorohydrocarbons, substantially free of at least one C₄-C₇isoolefin, where one or several fluorohydrocarbons comply with the formula C_xH_yF_z, in which x stands for integer number from 1 to 40 and y and z stand for integer numbers from one and more, and hydrocarbon is selected from alkanes, including linear, cyclic, branched alkanes, alkenes, aromatic compounds from C₄ to C₂₂ or their mixtures. Method for separation is carried out in extractive distillation system, including section of polymerisation reactor, from where azeotropic or azeotrope-like mixture is withdrawn, one column with section for entry of extractant, including at least one hydrocarbon, at least one condensation heat exchanger, from where product of contact is withdrawn, and at least one evaporation heat exchanger. Invention also relates to azeotropic mixture for separation, including 1,1,1,2-tetrafluoroethane and isobutylene at 0.84 mole fraction of 1,1,1,2-tetrafluoroethane at 25°C and 684 kPa and at 0.88 mole fraction of 1,1,1,2-tetrafluoroethane at 75°C and 2378 kPa; to azeotrope-like mixture for separation, including 1,1,1,2-tetrafluoroethane and isobutylene in the range from 0.8504 to 0.9968 mole fraction of 1,1,1,2-tetrafluoroethane at 25°C and from 663.29 to 683.99 kPa, and in the range from 0.8851 to 0.9958 mole fraction of 1,1,1,2-tetrafluoroethane at 75°C and from 2349.5 to 2377.5 kPa; to azeotropic mixture for separation, including 1,1-difluoroethane and isobutylene at approximatelt 0.87 mole fraction of 1,1-difluoroethane at 25°C and 603 kPa and at approximately 0.94 mole fraction of 1,1-difluoroethane at 75°C and 2091 kPa; to azeotropic mixture for separation, including 1,1-difluoroethane and isolbutylene in the range from 0.7536 to 0.813 mole fraction of 1,1-difluoroethane at 25°C and from 596.98 to 603.10 kPa and in the range from 0.7670 to 0.9325 mole fraction of 1,1-difluoroethane at 75°C and from 2054.0 to 2090.6 kPa.;EFFECT: production of substantially pure dissolvent, which may be used in polymerisation of C₄-C₇isoolefin at higher temperatures with considerable reduction of contamination in polymerisation reactor.;19 cl, 4 dwg, 7 tbl