HYDROGEN SULPHIDE REMOVAL FROM NATURAL GAS FLOW Russian patent published in 2012 - IPC B01D53/52 B01D53/24 F25J3/08 

FIELD: process engineering.

SUBSTANCE: invention relates to chemistry. Hydrogen sulphide is removed from natural gas flow bearing methane CH₄ and H₂S to cool said flow in heat exchanger 13, 16, 18. At least, portion of cooled flow is fed via feed pipeline 19, 21 into cyclone expander-separator 1. Here, cooled flow is expanded in nozzle 4 to be additionally cooled to temperature and pressure below dew point of hydrogen sulphide and separated in tubular separation chamber 9 into fraction of cooled low-density fluid. Said fraction is rich in methane and hydrogen sulphide depleted. Another fraction of aforesaid cooled flow represents high-density fluid rich in hydrogen sulphide and methane-depleted. Low-density cooled fluid flow is fed in gas product pipeline 33 communicated with heat exchanger 14 to cool down natural gas flow fed into cyclone expander-separator 1. High-density cooled fluid flow is fed in fractionator 8 for additional separation.

EFFECT: higher yield.

4 dwg