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Title: Delignification of lignocellulosic material with an alkaline liquor containing a cyclic amino compound
Abstract:
A process for the delignification of a lignocellulosic material, which comprises the steps of: (a) digesting the lignocellulosic material with an aqueous, alkaline pulping liquor containing from about 0.1% to about 10% based on the weight of oven-dried lignocellulosic material, of a cyclic amino compound selected from the group consisting of phenazine, dihydrophenazine, quinoxaline, and their alkyl, alkoxy, hydroxy, carboxy and amino derivatives at a temperature of from about 150.degree. C. to about 200.degree. C. for a period of from about 5 to about 480 minutes; and then (b) removing the aqueous pulping liquor from the lignocellulosic material with water or an aqueous wash liquor inert to the lignocellulosic material to obtain a delignified cellulosic material.
Other info: Inventors: Eckert, Robert C. (Kent, WA, US) Application Number: 910164 Filing Date: 1978-05-26 Publication_date: 1979-01-16 Assignee: International Paper Company (New York, NY) Primary Class(es): 162/72 162/90 Other Classes: US Patent Ref:
Other Refs:
Takagi et al., Starke 20, No. 8 pp. 251-256, (8-1968), "Determination of Carbonyl Groups In Starches . . ." | |