Catalytic gasification process with recovery of alkali metal...

C - Chemistry – Metallurgy – 10 – J

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C10J 3/00 (2006.01) C10J 3/46 (2006.01)

Patent

CA 2713642

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 hydrother-mal 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 catalyt-ic gasification of a carbonaceous material where a substantial portion of alkali metal is extracted and recovered from the char that re-sults from the catalytic gasification process.

La présente invention concerne des procédés d'extraction et de récupération de métal alcalin à partir du résidu carboné qui résulte de la gazéification catalytique d'une substance carbonée. Parmi d'autres étapes, les procédés de l'invention comprennent une étape de lixiviation hydrothermique dans laquelle une boue de matières particulaires insolubles comprenant des composés métalliques alcalins est traitée avec du dioxyde de carbone et de la vapeur à des températures et des pressions élevées pour effectuer la conversion de composés métalliques alcalins insolubles en composés métalliques alcalins solubles. En outre, l'invention décrit des procédés de gazéification catalytique d'une substance carbonée au cours de laquelle une partie substantielle de métal alcalin est extraite et récupérée à partir du résidu carboné qui résulte du procédé de gazéification catalytique.

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