Process for enhancing recovery of tall oil soap from black liquo

Details Process for enhancing recovery of tall oil soap from black liquo Process for enhancing recovery of tall oil soap from black liquo

Filed on

1975-09-15

Date issued

1979-03-06

Examiner

Spitzer, Robert H.

Patent Class

Liquid purification or separation

SubClass

With alarm, indicator, register, recorder, signal or...

SubSubClass

Responsive to fluid flow

Other Related Categories

210 44, B01D 1300

Type

Patent

Status

active

Patent number

041429672

Description

ABSTRACT:
Black liquor obtained from the sulfate pulping of resinous woods, such as that obtained from sulfate pulp digestors, is flowed into a skim tank where tall oil soap is skimmed from the surface. The skimmed effluent black liquor from the skim tank is passed through an ultrafiltration unit. Residual tall oil soap content in the black liquor effluent is concentrated in this unit and then recycled to the skim tank, while the permeate is sent to disposal. A by-pass is provided around the ultrafiltration unit to prevent build up of insoluble material such as fiber and other debris in the skim tank. The continued concentration of the tall oil soap in the skim tank causes the tall oil soap to agglomerate thereby decreasing its solubility in the black liquor, and allowing additional tall oil soap to be recovered. Improved yields of tall oil soap at lower costs and use of energy result. Tall oil is then produced by acidifying the recovered tall oil soap skimmings.

REFERENCES:
patent: 3356603 (1967-12-01), Drew
patent: 3404063 (1968-10-01), Harding
patent: 3519558 (1970-07-01), Cooper IV, et al.
patent: 3749657 (1973-07-01), LeBras et al.
patent: 3758405 (1973-09-01), Fremont
patent: 3917526 (1975-11-01), Jennings
Michaels et al., Membrane Ultrafiltraton, Jan. 1971, Chemical Technology, pp. 56-63.

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