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Catalytic Gasification Process with Recovery of Alkali Metal from Char

a gasification process and alkali metal technology, applied in the field of catalytic gasification process, can solve the problems of substantially insoluble alkali metal compound in water and has little effect as gasification catalyst, and achieve the effect of reducing the amount of makeup catalyst required

Inactive Publication Date: 2009-07-02
SURE CHAMPION INVESTMENT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The process can be run continuously, and the recovered alkali metal can be recycled back into the process to minimize the amount of makeup catalyst required.

Problems solved by technology

As an aluminosilicate, the alkali metal compound is substantially insoluble in water and has little effectiveness as a gasification catalyst.

Method used

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  • Catalytic Gasification Process with Recovery of Alkali Metal from Char
  • Catalytic Gasification Process with Recovery of Alkali Metal from Char

Examples

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example 1

Process that Can Be Used for Catalyst Extraction from a Carbonaceous Char

[0109]Hot char produced from the gasification of a potassium-loaded coal feedstock (lignite) is discharged directly into a quench slurry tank at about atmospheric pressure. Wash solution is introduced (recycled from a downstream CC Washing operation) containing about 25-40% of the total K. The concentration is such that the water insoluble char solids and the liquid phase gives a slurry density of about 20% solids. The temperature of the quench solution is about 95-100° C., and the steam that is generated (about 6-10% of the water) is condensed and recycled as wash water in the integrated process.

[0110]At this point, the main K species will be carbonates with possible amounts of hydroxide. The hot quench slurry is thoroughly dewatered by filtration and the filtered solids are washed (displacement washing on filter) with a KOH solution. The filtrate and the displacement KOH wash solution are each split into 2 st...

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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.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Ser. No. 61 / 017,293 (filed Dec. 28, 2007), the disclosure of which is incorporated by reference herein for all purposes as if fully set forth.[0002]This application is related to commonly owned U.S. application Ser. No. 11 / 421,511, filed Jun. 1, 2006, entitled “CATALYTIC STEAM GASIFICATION PROCESS WITH RECOVERY AND RECYCLE OF ALKALI METAL COMPOUNDS”; U.S. application Ser. No. ______, (filed concurrently herewith), entitled “CATALYTIC GASIFICATION PROCESS WITH RECOVERY OF ALKALI METAL FROM CHAR” (attorney docket no. FN-0014 US NP1); U.S. application Ser. No. ______, (filed concurrently herewith), entitled “CATALYTIC GASIFICATION PROCESS WITH RECOVERY OF ALKALI METAL FROM CHAR” (attorney docket no. FN-0015 US NP1); and U.S. application Ser. No. ______, (filed concurrently herewith), entitled “CATALYTIC GASIFICATION PROCESS WITH RECOVERY OF ALKALI METAL F...

Claims

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Application Information

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IPC IPC(8): C22B26/10
CPCC10J3/00C10J3/463C10J2300/0903C10J2300/093C10J2300/0943C10J2300/1853C10J2300/0986C10J2300/16C10J2300/1631C10J2300/169C10J2300/1807C10J2300/0973
Inventor RAPPAS, ALKIS S.SPITZ, ROBERT A.
Owner SURE CHAMPION INVESTMENT LTD
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