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:
Feb. 10, 1981
Filed:
Apr. 02, 1979
Applicant:
Inventors:
Allan F Gilbert, Thunder Bay, CA;
W Howard Rapson, Scarborough, CA;
Assignee:
ERCO Envirotech Ltd., Islington, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21C / ;
U.S. Cl.
CPC ...
162 17 ; 2330 / ; 162 / ; 162 / ; 162 33 ; 423D / ;
Abstract
The accumulation of potassium values in a closed cycle pulp mill process usually using sodium hydroxide as a pulping chemical is prevented by removal of potassium values as potassium chloride by crystallization. A variety of procedures are described, including coprecipitation from white liquor with sodium chloride followed by separation of the codeposited salts, precipitation from white liquor separate from sodium chloride precipitation, and intermittent precipitation from green liquor with intermittent precipitation of sodium chloride from white liquor.