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LIGNIN DEPOLYMERIZATION PROCESS USING CHEMICALS RECOVERABLE BY THE KRAFT RECOVERY CYCLE
LIGNIN DEPOLYMERIZATION PROCESS USING CHEMICALS RECOVERABLE BY THE KRAFT RECOVERY CYCLE
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机译:使用牛皮纸回收循环可回收的化学物质进行木质素解聚过程
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摘要
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.
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