Cryogenic treatment of landfill gas to remove troublesome compou

Details Cryogenic treatment of landfill gas to remove troublesome compou Cryogenic treatment of landfill gas to remove troublesome compou

1995-12-26

1997-01-28

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62634, F25J 300

Patent

active

055968848

ABSTRACT:
The cryogenic treatment of landfill gas removes troublesome compounds that cause severe corrosion of combustion engines in which the gas is used as fuel. It involves compressing the gas to an elevated pressure and isenthalpically expanding the gas to chill the gas to a temperature below -20 .degree. F. The compressed gas is first cooled to eliminate moisture as condensate. Methanol is injected into the gas so that it can be deeply chilled without forming ice with residual moisture in the gas. An aqueous methanol condensate containing troublesome compounds forms in, and is removed from, the deeply chilled gas before it is expanded to provide refrigeration for chilling the gas. By adding water to the aqueous methanol, the troublesome compounds lose solubility in diluted methanol and form a supernatant layer that can be separated for disposal. The diluted methanol can be recycled.

REFERENCES:
patent: 4266958 (1981-05-01), Cummings
patent: 4406774 (1983-09-01), Cummings et al.
patent: 4711093 (1987-12-01), Markbreiter et al.

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