INSTALLATION AND METHOD FOR PRODUCING LIQUID CARBON DIOXIDE FROM GAS MIXTURES CONTAINING CARBON DIOXIDE USING MEMBRANE TECHNOLOGY Russian patent published in 2018 - IPC C01B32/50 B01D61/00 F25J1/00 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical technology and can be used in removal of carbon dioxide from gas mixtures containing it, as well as in production of liquid carbon dioxide and dry ice. Plant is made in the volume of a standard 13.7 meter container and contains the first, second and third compressors (8.1), (8.2) and (8.3), six membrane separation units for obtaining the corresponding permeates and retentates, vacuum pumps (15.1) and (15.2), heat exchanger (9) for cooling flow compressed by first compressor (8.1); heat exchanger (10) for cooling a stream compressed by second compressor (8.2), smoke cooler (11), buffer tanks (12) and (13), carbon dioxide compressor (16), drying unit (17), condenser-evaporator and isothermal vessel (20) for storing condensed carbon dioxide. Installation may comprise dry ice pelletizer (21), filling station for cylinders (22), ballon (23), scales (24), and circulating water system including cooling tower, water tank (26), and pump (27). Membrane separation units from the first to the fourth are made of membranes based on organosilicon polymers with selectivity for a pair of gases carbon dioxide/basic non-target gas of not less than 9 and productivity of carbon dioxide of at least 10 m³/m²*h*MPa. Fifth membrane separation unit is made of membranes based on organosilicon polymers with selectivity for a pair of carbon dioxide gases/basic non-target gas of at least 20. Operating pressure for second and third compressors (8.2) and (8.3) is set above the operating pressure of first compressor (8.1) by at least 0.1 MPa.

EFFECT: installation is compact and provides increase in the efficiency of obtaining liquid carbon dioxide from gas mixtures containing it, as well as the possibility of additional nitrogen extraction.

5 cl, 2 dwg, 2 tbl