Process for the production of substitute natural gas. [with recycling of high pressure steam from wet methanation of carbonaceous material]

Patent · Fri Sep 06 04:00:00 EDT 1974

OSTI ID:7177622

White, G A; Rozkowski, T R

A process is claimed for the production of substitute natural gas which comprises: (a) providing from the process a supply of high pressure steam; (b) using a portion of the high pressure steam to liquefy air and generate, from the liquefied air, gaseous oxygen; (c) introducing the gaseous oxygen, steam, and a carbonaceous material to a partial oxidation reaction zone to form an initial gas stream containing predominately hydrogen and the oxides of carbon and minor amounts of methane; and (d) passing at least a portion of the initial gas stream and steam through at least one wet methanation reaction zone where the gas stream and steam contact a low metal content wet methanation catalyst which comprises from about 5 to about 35 percent by weight of at least one metal from the third period of Group VIII of the Periodic Table on a temperature stabilized, ceramic alumina support, said support being heat treated at a temperature above the highest temperature encountered in said methanation zone prior to the addition of said metal thereto, at a temperature from about 900 to about 1600/sup 0/F where the feed temperature to said wet methanation zone is at least about 900/sup 0/F and the exit temperature from said methanation zone is up to about 1600/sup 0/F to form methane followed by cooling of the gas stream exiting the wet methanation zone to produce high pressure process steam.

• Assignee: Ralph M. Parsons Co.
• Patent Number(s): US 3938968
• OSTI ID: 7177622
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ALKANES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
FLUIDS
GASIFICATION
HIGH TEMPERATURE
HYDROCARBONS
METHANATION
METHANE
ORGANIC COMPOUNDS
PARTIAL OXIDATION PROCESSES
SYNTHESIS
VERY HIGH TEMPERATURE