Process for separating soap from black liquor

Details Process for separating soap from black liquor Process for separating soap from black liquor

1975-10-01

1977-05-10

Lutter, Frank W.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Including recovery of organic by-product

159DIG5, 162 29, 210 71, 260 976, 260 977, D21C 1100

Patent

active

040226530

ABSTRACT:
Soap is separated from spent, cellulosic pulping liquor by strenuously percolating a gaseous, aliphatic hydrocarbon through a quantity of liquor volume under such temperature and pressure conditions that an equilibrious strata of liquid phase hydrocarbon is sustained on the surface of the liquor. Following strenuous combination and agitation, the gas-liquor mixture is allowed to settle so that the entrained, gaseous hydrocarbon and coagulated soap floc gravimetrically rises to the liquor surface and stratifies with the soap layer between the residual liquor solution and a liquid phase layer of hydrocarbon. Thereafter, the liquid hydrocarbon and soap layer are decanted away from the residual liquor solution and depressurized to vaporize the hydrocarbon leaving a reservoir of isolated soap.

REFERENCES:
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patent: 2200468 (1940-05-01), Cirves
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patent: 2371307 (1939-12-01), Mitchell
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patent: 3578628 (1971-05-01), Chun et al.
patent: 3830789 (1974-08-01), Garrett et al.
patent: 3880704 (1975-04-01), Ziegler et al.
patent: 3965085 (1976-06-01), Holmbom et al.

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