Hydrogasification gas processing studies

Technical Report · Wed Feb 01 04:00:00 EST 1978

OSTI ID:6461555

Three methods of separating hydrogen from methane and carbon monoxide were evaluated: use of a moving bed of activated carbon (hypersorption), use of cryogenics, and use of an ''absorbing oil'' to absorb the methane. The feed gas stream studied was the make-gas from a hydrogasifier. This separation was necessary to permit: (a) recycle of the hydrogen to the hydrogasifier, and (b) production of a pipeline gas quality methane stream that would meet the low carbon monoxide specification for pipeline gas. Hypersorption (moving bed of activated carbon) was the method of gas separation chosen. Its advantages are competitive economics and recovery of each of the components with nil quantities of the others at nearly system pressure. This makes is possible to eliminate methanation facilities, thereby simplifying the process. The opportunity for simplification of the process was made possible by the higher conversion gained in the single-stage flash hydropyrolysis unit compared to the first stage of the Hydrane process. By holding the total conversion during the flash hydropyrolysis at about 46%, a ''balance'' is struck between the conversion of coal to hydrocarbons and the production of sufficient char to make the needed hydrogen for the hydrogasifier. Processing of the gas from the hydrogasifier into a product gas stream containing less than 0.1% CO and a recycle hydrogen stream results in the desired simplification by eliminating the need for methanation of the product gas stream.

• Research Organization: Dravo Corp., Pittsburgh, PA (USA)
• OSTI ID: 6461555
• Report Number(s): METC/CR-78/19
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010403 -- Coal & Coal Products-- Hydrogenation-- (-1987)
010404* -- Coal
Lignite
& Peat-- Gasification
010405 -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ACTIVATED CARBON
ADSORBENTS
ALKANES
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
COAL GASIFICATION
COAL LIQUEFACTION
COMPARATIVE EVALUATIONS
CRYOGENIC FLUIDS
CRYOGENICS
ELEMENTS
FLASH HYDROPYROLYSIS PROCESS
FLUIDS
GASIFICATION
HYDRANE PROCESS
HYDROCARBONS
HYDROGEN
HYDROGEN PRODUCTION
LIQUEFACTION
METHANATION
METHANE
MODIFICATIONS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS PRODUCTS
RECOMMENDATIONS
SEPARATION PROCESSES
SNG PROCESSES
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES