Method for the delignification of lignocellulosic material in an amine delignifying liquor containing a quinone or hydroquinone compound
First Claim
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1. A process for the delignification of lignocellulosic raw materials in the production of cellulosic pulps suitable for use in the manufacture of paper or paperboard which consists of pretreating the lignocellulosic raw material with a quinone or a hydroquinone compound in an essentially non-aqueous pretreatment liquor consisting of an amine delignifying liquor and cooking the lignocellulosic raw material with the pretreatment liquor or another amine delignifying liquor.
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Abstract
A delignification process using amine cooking liquors which also contain a quinoid or hydroquinoid compound. The process also encompasses a pretreatment step using the quinoid or hydroquinoid compounds.
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14 Claims
- 1. A process for the delignification of lignocellulosic raw materials in the production of cellulosic pulps suitable for use in the manufacture of paper or paperboard which consists of pretreating the lignocellulosic raw material with a quinone or a hydroquinone compound in an essentially non-aqueous pretreatment liquor consisting of an amine delignifying liquor and cooking the lignocellulosic raw material with the pretreatment liquor or another amine delignifying liquor.
- 10. A process for the delignification of lignocellulosic raw materials in the production of cellulosic pulps suitable for use in the manufacture of paper or paperboard and the like, which consists of cooking said lignocellulosic raw materials with a quinone or hydroquinone compound in an essentially non-aqueous cooking liquor consisting of an amine.
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