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:
Apr. 13, 1976
Filed:
Dec. 12, 1973
Douglas W Reeve, Orton, CA;
ERCO Envirotech Ltd., Islington, CA;
Abstract
In the recovery and regeneration of spent pulping chemicals from the production of cellulosic fibrous material pulp there is provided a white liquor containing dissolved quantities of sodium chloride and unregenerated pulping chemicals. The white liquor is concentrated by evaporation to deposit therefrom sodium chloride and unregenerated pulping chemicals, unregenerated pulping chemicals substantially free from sodium chloride are recovered from the deposited materials, and sodium chloride is separated and recovered from the deposited materials. The deposition of sodium chloride and unregenerated pulping chemicals is usually carried out in two stages, with unregenerated pulping chemicals substantially free from sodium chloride being deposited in the first stage. The sodium chloride then is deposited in the second stage, possibly in admixture with unregenerated pulping chemicals, in which event substantially pure sodium chloride is separated from the deposited mixture. At least part of the unregenerated pulping chemicals substantially free from sodium chloride are forwarded to the spend pulping liquor.