Method of producing water slurry of SDA asphaltene
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United States of America Patent
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Sep 12, 2000
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N/A
app pub date -
Jul 10, 1997
filing date -
Jul 12, 1996
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Abstract
Disclosed is a method of producing water slurry of SDA asphaltene by dispersing residue resulting from solvent deasphalting of petroleum vacuum residue produced in refineries, which has low viscosity even at a high solid concentration and is stable for a long period of time, in industrial scale under stable operation. The method comprises a grinding step of grinding the SDA asphaltene with water in a grinding apparatus in the presence of a dispersing agent, followed by a stabilizing step of stirring the resulting slurry to stabilize it. In the grinding step a suitable amount of a thickener such as carboxymethyl cellulose is added. Grinding is preferably carried out at a temperature not higher than 80.degree. C. Jacketed ball mills are conveniently used. In the stabilizing step a stabilizer such as Attapulgus clay is added after stirring the slurry to decrease viscosity thereof and stirring is continued.
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