C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/12
C10G 1/04 (2006.01) C10G 1/00 (2006.01)
Patent
CA 1138360
U.S. 20,603 ABSTRACT OF THE DISCLOSURE Scale formation during the liquefaction of lower ranking coals and similar carbonaceous materials is significantly reduced and/or prevented by pretreatment with a combination of pretreat- ing agents comprising S02 and an oxidizing agent. The pretreat- ment is believed to convert at least a portion of the scale- forming components and particularly calcium, to the correspond- ing sulfate prior to liquefaction. The pretreatment may be accomplished with the combination of pretreating agents either simultaneously by using a mixture comprising S02 and an oxidiz- ing agent or sequentially by first treating with S02 and then with an oxidizing agent.
336118
Gorbaty Martin L.
Poddar Syamal K.
Stone John B.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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