METHOD OF PRODUCING OXYGEN BY VPSA, COMPRISING USING FOUR ADSORBERS Russian patent published in 2019 - IPC B01D53/47 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing oxygen by adsorption from an atmospheric air flow, comprising using a VSPA-type apparatus comprising four adsorbers, one air compressor and two vacuum pumps, wherein each adsorber undergoes one cycle of pressure change with phase time shift, which includes the following steps: a) obtaining a first gas stream characterized by C1 oxygen content when loading an atmospheric air stream upstream of the adsorber; b) obtaining a second gas stream characterized by oxygen content of C2 < C1; c) obtaining a third gas stream characterized by oxygen content of C3 < C2 < C1, while simultaneously extracting a nitrogen-rich waste stream; d) eluting the adsorber, from which the three gas streams obtained at steps a), b) and c) are released, by means of exclusively the second gas stream obtained at step b), or the third gas stream obtained at step c); e) repeatedly increasing the pressure in the adsorber which has been eluted at step d), successively by at least two streams, first and second streams providing a re-pressure, characterized by increasing oxygen content, wherein the first flow providing repeated pressure increase is the third gas flow obtained at step c), and the second flow providing repeated increase of pressure is the second gas flow obtained at stage b).

EFFECT: disclosed is a method of producing oxygen by VPSA, which involves use of four adsorbers.

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