The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 1979
Filed:
Sep. 15, 1975
Henry A Fremont, Hamilton, OH (US);
Champion International Corporation, Stamford, CT (US);
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.