METHOD OF DRYING CARBON DIOXIDE GAS AFTER REGENERATION OF SYNTHETIC ZEOLITE WHEN PRODUCING LIQUID CARBON DIOXIDE OF PRIME GRADE FROM UNDERGROUND SOURCES Russian patent published in 2020 - IPC B01D53/00 

FIELD: technological processes.

SUBSTANCE: invention is intended for industries using high-grade carbon dioxide and can be used in production of liquid carbon dioxide. Mixture of natural carbon dioxide and water vapor is supplied to gasholder 1 with open valve 2. From gasholder at pressure of 0.17 MPa and temperature of 10 °C through open valve 4 is supplied to adsorber of moisture 7 with synthetic zeolite of grade KA-CO. At that time second adsorber 8 is in regeneration. Valves 3, 5, 9–11, 14 are closed, valves 4, 6, 12 are open. Dry gas is sucked from adsorber 7 by double-stage oil-free carbon-dioxide compressor 15. After the first compression stage, gas with pressure of 0.4 MPa and temperature of 70 °C enters intermediate water cooler 16 where it is cooled. Further, the cooled carbon dioxide at temperature of 15–30 °C is sucked by the second stage of the compress and compressed to pressure of 1.75 MPa and temperature of 120–130 °C. Then, the main portion of the gas is injected into water cooler 17, which passes the gas for condensation, and small portion 1.92–1.95 % of gas flow is supplied to adsorber 8, through valve 6, for regeneration of zeolite. Duration of regeneration per day makes 0.92–1.1 hours. After regeneration and cooling of zeolite in adsorber 8, duration of 2.8–3.12 hours, it is put into operation, and working before adsorber 7 is switched to regeneration. Carbon dioxide and water vapors from regenerated adsorber 8 at pressure 0.17 MPa with open valve 9 are supplied to water cooler 13, where they are cooled to temperature of 30–50 °C and carbon dioxide is dried. Further, when valve 14 is open, gas is mixed with dried carbon dioxide after adsorber at mixture temperature of 10.5–11 °C and sucked by first stage of compressor 15.

EFFECT: invention increases efficiency of installation of liquid carbon dioxide from underground sources at constant operating costs, which will reduce cost of obtained liquid carbon dioxide.

1 cl, 1 dwg, 3 ex