CELLULOSE-CONTAINING MATERIAL MANUFACTURING PROCESS Russian patent published in 2005 - IPC

FIELD: cellulose derivatives production.

SUBSTANCE: invention is intended to be employed in paper-and-pulp industry in sulfate or natron cellulose manufacture process. Coniferous or foliferous wood is cooked in alkali solution at elevated temperature and pressure in presence of anthraquinone as delignification catalyst, the latter being product obtained after acylation of phthalic anhydride with benzene, which is added in 0.01-0.1% excess to dry wood, cooking being carried out in a way that 12-16% of active alkali based on the weight of dry wood is consumed.

EFFECT: improved quality of produced material due to reduced degree of delignification and amount of non-cooked raw material, increased yield, and improved physicochemical characteristics.

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