Selective adsorption process
In pressure swing adsorption processing including higher pressure adsorption, cocurrent depressurization to intermediate pressure, countercurrent depressurization and/or lower pressure purge and repressurization, a cocurrent purge step is employed at adsorption pressure prior to cocurrent depressurization. Methane or natural gas is advantageously employed as the cocurrent purge gas. The cocurrent purge step reduces the storage of product gas, such as hydrogen, in the bed, enhances product recovery and correspondingly reduces the amount of desired product gas discharged with the waste gas discharged the countercurrent depressurization and/or purge steps used for bed regeneration. The value of the waste gas as a fuel is likewise enhanced by the presence of said methane or natural gas therein.
- Assignee:
- Union Carbide Corporation
- Patent Number(s):
- US 4475929
- OSTI ID:
- 6137664
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
030400* -- Natural Gas-- Products & By-Products
ADSORPTION
ALKANES
AMMONIA
DEPRESSURIZATION
ELEMENTS
ENERGY SOURCES
FLUIDIZED BED
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDRIDES
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
IMPURITIES
METHANE
NATURAL GAS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC COMPOUNDS
PRESSURE DEPENDENCE
PRODUCTION
PURIFICATION
SEPARATION PROCESSES
SORPTION
SYNTHESIS
SYNTHESIS GAS