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:
Aug. 09, 2022
Filed:
Nov. 14, 2017
Upm-kymmene Corporation, Helsinki, FI;
Mauno Miettinen, Lappeenranta, FI;
Sami Turunen, Lappeenranta, FI;
Meri Ventola, Lappeenranta, FI;
Juha Tamper, Levänen, FI;
UPM-KYMMENE CORPORATION, Helsinki, FI;
Abstract
In a method and an apparatus for recovering chemicals from an alkaline lignin material, the alkaline lignin material () which comprises NaOH or KOH is precipitated in presence of an acid in a precipitation stage () for forming a precipitated lignin (), the precipitated lignin () is supplied to a separation stage () in which a purified lignin () is recovered and from which at least one fraction () which comprises Na or K is supplied to a crystallization stage (), and the fraction () which comprises Na or K is treated by crystallization in the crystallization stage () for forming a crystallized compound (). Further, the invention relates to use of the purified lignin, and lignin and chemical products.