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1. (WO2018205021) LIGNIN DEPOLYMERIZATION PROCESS USING CHEMICALS RECOVERABLE BY THE KRAFT RECOVERY CYCLE

Pub. No.:    WO/2018/205021    International Application No.:    PCT/CA2018/050547
Publication Date: Fri Nov 16 00:59:59 CET 2018 International Filing Date: Wed May 09 01:59:59 CEST 2018
IPC: C08J 11/12
C07G 1/00
C08H 7/00
Applicants: FPINNOVATIONS
Inventors: PALEOLOGOU, Michael
AHMAD, Zaid
XU, Chunbao
Title: LIGNIN DEPOLYMERIZATION PROCESS USING CHEMICALS RECOVERABLE BY THE KRAFT RECOVERY CYCLE
Abstract:
The present relates to a process for the depolymerization of lignin using chemicals recoverable by the soda or kraft mill recovery cycles. The process involves the use of sodium hydroxide or white liquor to depolymerize lignin in black liquor or other lignins (e.g. hydrolysis lignin, kraft lignin) by conducting the reaction at 170-250 °C for up to 3 hours in the presence or absence of a co-solvent and a capping agent. The depolymerized lignin is then obtained by acidifying the reaction products to a low pH to precipitate the de-polymerized lignin, followed by particle coagulation, cake filtration and washing with acid and water to obtain a purified depolymerized lignin product.