METHOD FOR OBTAINING XENON CONCENTRATE FROM NATURAL GAS Russian patent published in 2021 - IPC C01B23/00 F25J3/02 

FIELD: inorganic chemistry.

SUBSTANCE: invention relates to the field of inorganic chemistry, namely to separation of the components of natural gas by gas hydrate crystallisation and membrane gas separation methods combined in a single mass transfer apparatus, and can be used to obtain xenon concentrate. The method includes forming gas hydrates of xenon at a pressure of 2.4 to 8.0 MPa and temperature of 273 to 283 K followed by decomposition thereof forming a xenon concentrate. Areas of low pressure from 0.01 to 0.1 MPa and high pressure from 2.4 to 8.0 MPa are thereon created in a membrane-gas hydrate crystalliser, separated by a non-porous polymer gas separation membrane. The natural gas flow is then supplied to a high pressure area with a 6-10-fold water excess therein relative to the volume concentration of hydrate-forming gases in natural gas under the specified conditions to form gas hydrates of xenon. The components of natural gas with high gas permeability are then removed from the membrane-gas hydrate crystalliser after passing through the non-porous polymer gas separation membrane in the low pressure area. When xenon appears in the exhaust gases, the natural gas supply is terminated, and the formed gas hydrates are taken with a screw into the separation module for destruction into water and xenon concentrate with an increase in the temperature from 293 to 323 K, the remaining components of natural gas are removed from the high pressure area for processing.

EFFECT: technical result of the claimed invention consists in increasing the degree of concentration of xenon.

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