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:
Dec. 26, 1978
Filed:
Mar. 12, 1973
Oliver A Laakso, Glens Falls, NY (US);
Kamyr Inc., Glen Falls, NY (US);
Abstract
A method is provided for recovery of white liquor and sodium hydroxide following the oxygen bleaching of pulp. A green liquor recovery system concentrates the spent black liquor, including spent liquor from the oxygen bleaching and spent black liquor, and then burns the spent liquor to form a smelt. This smelt is then dissolved in water to form the green liquor. The green liquor is divided into a first portion which is fed to a sodium hydroxide recovery system for recycling to the oxygen bleaching reactor and a second portion which is fed to a white liquor recovery system for recycling to the digester. A lime cycle is also provided to convert the resulting calcium carbonate (lime mud) to calcium oxide for recycling into the sodium hydroxide and white liquor recovery systems.