Catalytic gasification process with recovery of alkali metal from char
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United States of America Patent
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Mar 8, 2011
Grant Date -
Jul 2, 2009
app pub date -
Dec 23, 2008
filing date -
Dec 28, 2007
priority date (Note) -
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Abstract
Processes are described for the extraction and recovery of alkali metal from the char that results from catalytic gasification of a carbonaceous material. Among other steps, the processes of the invention include a hydrothermal leaching step in which a slurry of insoluble particulate comprising insoluble alkali metal compounds is treated with carbon dioxide and steam at elevated temperatures and pressures to effect the conversion of insoluble alkali metal compounds to soluble alkali metal compounds. Further, processes are described for the catalytic gasification of a carbonaceous material where a substantial portion of alkali metal is extracted and recovered from the char that results from the catalytic gasification process.
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