| 摘要 |
<p>In a coal gasification operation or similar conversion process carried out in the presence of an alkali metal-containing catalyst wherein solid particles containing alkali metal residues are produced, alkali metal constituents are recovered from the particles by mixing them with a calcium or magnesium-containing compound and heating the resultant mixture of solids to a temperature sufficiently high to cause the calcium or magnesium-containing compound to react. with water-insoluble constituents of the alkali metal residues, such as alkali metal aluminosilicates, to produce reaction products containing water-soluble alkali metal constituents and waterinsoluble compounds such as calcium silicates and the like. The reaction products are contacted with water, which leaches the water-soluble alkali metal constituents from. the solids thereby forming an aqueous solution containing these constituents. The aqueous solution is recycled to the gasification process where the alkali metal constituents serve as at least a portion of the alkali metal constituents which comprise the alkali metal-containing catalyst.</p> |
