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. 20, 1994
Filed:
Jul. 30, 1992
Tuomo S Nykanen, Glens Falls, NY (US);
Brian F Greenwood, Glens Falls, NY (US);
Johan Gullichsen, Helsinki, FI;
Erkki Kiiskila, Karhula, FI;
Esko Mattelmaki, Varkaus, FI;
Joseph R Phillips, Glens Falls, NY (US);
Jan Richardsen, Roswell, GA (US);
Rolf Ryham, Roswell, GA (US);
Jarmo Soderman, Helsinki, FI;
Karl G Wiklund, Karhula, FI;
Kamyr, Inc., Glens Falls, NY (US);
Abstract
Apparatus for a pulp and paper mill, and methods of acting on liquid effluents produced in the mill, which minimizes the discharge of polluting gaseous and liquid effluents to the environment. Liquid effluents from the bleach plant are concentrated (e.g. evaporated), incinerated (e.g. gasified), leached, crystallized (e.g. freeze crystallized) then washed, and then fed to the plant chemical recovery loop. White liquor produced from the recovery boiler melt is fully oxidized and used in place of caustic in the bleach plant. Essentially all sulfuric acid, sulfur dioxide, caustic, and chlorine dioxide necessary for the pulp mill is produced from mill liquid effluents and gas waste streams, on site at the pulp mill. Typical bleaching sequences that can be used are DE.sub.op D.sub.n D, or AZE.sub.o PZP.