C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/3
C10G 1/04 (2006.01) C10G 1/00 (2006.01)
Patent
CA 1117453
ABSTRACT OF THE DISCLOSURE A process for the liquefaction of a calcium-containing sub- bituminous or lower rank coal; wherein the coal is first treated to form a water-insoluble thermally stable calcium compound which remains in the pore of the coal on liquefaction, by (i) contacting the coal in particulate form with single compound MX, in an aqueous solution, capable of forming the said water-insoluble, thermally stable calcium compound, M being H+, an ammonium ion or a monovalent or multiple cation selected from the group consisting of the Group IA, IVA, VIB, and VIII metals of the periodic table of the elements, and X being sulfate, carbonate or phosphate, and (ii) maintaining the contact for a period of time sufficient for impregnation of the compound into the pores of the coal; and wherein the thus single compound impregnated coal is then recovered and subjected to coal liquefaction conditions. On separation of the impregnated particul- ate coal from the solution, the coal can be liquefied in a coal liquefaction reactor (reaction zone) at coal liquefaction conditions without significant formation of vaterite or other forms of calcium carbonate scale on reactor surfaces, auxiliary equipment and the like.
297099
Gorbaty Martin L.
Taunton John W.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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