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:
Jun. 30, 2015
Filed:
Jun. 10, 2009
Anders Littorin, Hisings Kärra, SE;
Henrik Wallmo, Alingsås, SE;
Hanna Kristina Karlsson, Göteborg, SE;
Martin Wimby, Torslanda, SE;
Anders Littorin, Hisings Kärra, SE;
Henrik Wallmo, Alingsås, SE;
Hanna Kristina Karlsson, Göteborg, SE;
Martin Wimby, Torslanda, SE;
VALMET POWER AB, Goteborg, SE;
Abstract
The method is for separation of lignin from original black liquor. Lignin is precipitated in a first acidification stage followed by dewatering a first lignin suspension while forming a first filter cake. The first lignin filter cake is suspended in a second acidification stage whereupon a second lignin suspension is obtained. The second lignin suspension is dewatered to form a second filter cake. The second filter cake is washed and the washed second lignin cake is dewatered to obtain a lignin product. Waste gases from the second acidification stage is recirculated back to the first acidification stage and mixed with the original black liquor.