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Carbonaceous Fines Recycle

  • US 20090217589A1
  • Filed: 02/27/2009
  • Published: 09/03/2009
  • Est. Priority Date: 02/29/2008
  • Status: Active Grant
First Claim
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1. A particulate composition having a particle distribution size suitable for gasification in a fluidized bed zone, the particulate composition comprising an intimate mixture of:

  • (a) a carbonaceous fines material having an average particle size of less than about 45 microns;

    (b) a particulate carbonaceous feedstock material having a particle distribution size suitable for gasification in a fluidized bed zone; and

    (c) a gasification catalyst which, in the presence of steam and under suitable temperature and pressure, exhibits gasification activity whereby a plurality of gases comprising methane and one or more of hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia and other higher hydrocarbons are formed from the particulate composition,wherein;

    (1) the carbonaceous fines material and particulate carbonaceous feedstock are present in the particulate composition at a weight ratio of from about 1;

    99 to about 99;

    1;

    (2) the carbonaceous fines material is physically associated with the particulate carbonaceous feedstock;

    (3) the carbonaceous fines material and the particulate carbonaceous feedstock each comprise a gasification catalyst; and

    (4) the gasification catalyst comprises a source of at least one alkali metal and is present in an amount sufficient to provide, in the particulate composition, a ratio of alkali metal atoms to carbon atoms ranging from 0.01 to about 0.08.

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