C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/3
C10G 1/04 (2006.01) B01D 12/00 (2006.01)
Patent
CA 1138800
SOLIDS PRECIPITATION PROCESS FOR COAL-DERIVED LIQUIDS USING RECYCLED SOLVENT FRACTIONS ABSTRACT A solids removal step for coal liquefaction-hydrogenati processes utilizes the addition of a selective solvent liquid fraction to coal-derived liquids to produce rapid precipitation of solids and thereby achieve a high percentage of solids removal from the coal-derived liquids. It uses a selected solvent additive liquid fraction which is convenient obtained from the coal liquefaction process by distillation, without need for additional hydrogenation steps or the addition of any extraneous liquids. The solvent liquid used is a coal-derived liquid fraction boiling between about 300-550°F, which has a Watson characterization factor (K) in the range of 9.5-11, and also has a Kauri-butanol value exceeding about 40 and preferably is 50-130. Following mixing of the two hydrocarbon liquids together, the resulting settling time for particulate solids in the liquid mixture is relatively short, usually less than about 45 minutes and under certain conditions may be about 15-30 minutes. The resulting clarified overflow liquid portion from this solids precipitation step contains less than about 0.1 W % ash and unconverted coal solids, while the underflow liquid portion contains 30-50 W % solids and may receive further processing as desired, such as coking. Although this solids precipitation step is useful with various coal liquefaction processes, it is preferably used with catalytic hydrogenation processes such as the H-Coal? process wherein between about 2 and 4 W % hydrogen is chemically combined with the coal derived liquid.
338696
Shen John
Volk William
Gowling Lafleur Henderson Llp
Hydrocarbon Research Inc.
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