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Title: Recovery of alkali metal constituents from catalytic coal conversion residues

In a coal gasification operation (32) or similar conversion process carried out in the presence of an alkali metal-containing catalyst wherein particles containing alkali metal residues are produced, alkali metal constituents are recovered from the particles by contacting them (46, 53, 61, 69) with water or an aqueous solution to remove water-soluble alkali metal constituents and produce an aqueous solution enriched in said constituents. The aqueous solution thus produced is then contacted with carbon dioxide (63) to precipitate silicon constituents, the pH of the resultant solution is increased (81), preferably to a value in the range between about 12.5 and about 15.0, and the solution of increased pH is evaporated (84) to increase the alkali metal concentration. The concentrated aqueous solution is then recycled to the conversion process (86, 18, 17) where the alkali metal constituents serve as at least a portion of the alkali metal constituents which comprise the alkali metal-containing catalyst.
Authors:
 [1]
  1. (Houston, TX)
Publication Date:
OSTI Identifier:
865081
Report Number(s):
US 4459138
DOE Contract Number:
ET-78-C-01-2777
Resource Type:
Patent
Research Org:
Exxon Research and Engineering Co
Country of Publication:
United States
Language:
English
Subject:
recovery; alkali; metal; constituents; catalytic; coal; conversion; residues; coal; gasification; operation; 32; similar; conversion; process; carried; presence; alkali; metal-containing; catalyst; particles; containing; alkali; metal; residues; produced; alkali; metal; constituents; recovered; particles; contacting; 46; 53; 61; 69; water; aqueous; solution; remove; water-soluble; alkali; metal; constituents; produce; aqueous; solution; enriched; constituents; aqueous; solution; produced; contacted; carbon; dioxide; 63; precipitate; silicon; constituents; ph; resultant; solution; increased; 81; preferably; value; range; 12; 15; solution; increased; ph; evaporated; 84; increase; alkali; metal; concentration; concentrated; aqueous; solution; recycled; conversion; process; 86; 18; 17; alkali; metal; constituents; serve; portion; alkali; metal; constituents; comprise; alkali; metal-containing; catalyst; catalytic coal; concentrated aqueous; gasification operation; coal conversion; process carried; containing alkali; similar conversion; water-soluble alkali; conversion process; conversion process; particles containing; alkali metal-containing; alkali metal-containing; metal constituents; metal constituents; metal constituents; metal constituents; metal constituents; carbon dioxide; alkali metal; alkali metal; alkali metal; alkali metal; alkali metal; alkali metal; alkali metal; alkali metal; alkali metal; aqueous solution; aqueous solution; aqueous solution; aqueous solution; coal gasification; coal gas; remove water; metal residues; metal-containing catalyst; metal-containing catalyst; soluble alkali; resultant solution; metal constituent; metal constituent; metal constituent; metal constituent; metal constituent; constituents serve; metal concentration; move water; particles contain /48/208/502/