FIELD: oil and gas industry.
SUBSTANCE: low-temperature separation method for gas mixtures consists in delivery of cooled gas mixture to be separated to the column, heat is supplied to liquid fraction of high-boiling component in the separated gas mixture in the column bottom from evaporator and electric heater, heat is removed from the separated gas mixture by cooling medium in the condenser with formation of wet reflux and gaseous fraction of low-boiling component and temperature control is performed along the column height. Then intermediate component is delivered additionally to the column, and condensation temperature of this component at the preset pressure in the column is higher than condensation temperature of low-boiling component in the separated gas mixture but less than condensation temperature of high-boiling component in the separated gas mixture. The intermediate component is maintained in the rectifying profile by regulating consumption rate of the extracted gaseous fraction of low-boiling component in the gas mixture according to temperature and pressure in the rectifying profile. Delivery of the intermediate component is started upon cooling with wet reflux at the length minimum of 20% of the rectifying profile that adjoins the condenser, and delivery of the intermediate component is completed upon cooling of the whole rectifying profile with wet reflux, and cooling of stripping profile is accompanied by delivery of the separated gas mixture with limitation of consumption rate up to 20-30% of full consumption rate, which is performed when liquid fraction of high-boiling component of the separated gas mixture appears in the column bottom.
EFFECT: extension of application area.
5 cl, 4 dwg, 2 tbl
