Method for producing acetification-grade dissolving pulp by using veneer

A technology for dissolving pulp and board skin, which is applied in the direction of pulping with organic compounds, pulping with inorganic alkalis, and cellulose treatment with microorganisms/enzymes, etc., to achieve the effect of cleaning the production process
CN109403115AInactive Publication Date: 2019-03-01QILU UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QILU UNIV OF TECH
Publication Date
2019-03-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of dissolving pulp preparation and particularly relates to a method for producing acetification-grade dissolving pulp by using veneer. The method comprisesthe following steps: adding auxiliaries for prehydrolysis; Soda / AQ cooking stage I; Soda / AQ cooking stage II; OPDQEPP bleaching; enzyme collaborative treatment. The veneer acetification-grade dissolving pulp with high purity and high reaction activity is prepared; the applied chemicals are clean and environmentally friendly, and the production technology is clean.
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Description

technical field

[0001] The invention relates to the technical field of dissolving pulp preparation, in particular to a method for producing vinegar grade dissolving pulp by using poplar veneer. Background technique

[0002] At present, the world's output of cellulose acetate is nearly 1 million tons, while my country's annual output of cellulose acetate is nearly 400,000 tons, and the annual consumption of acetate-grade wood dissolving pulp is about 300,000 tons. The esterification grade dissolving pulp is mainly used to prepare triacetate fiber cellulose diacetate, the hydroxyl groups on the 2, 3, and 6 positions of the cellulose glucose unit in the dissolving pulp are almost completely acetylated to obtain cellulose triacetate (substitution degree > 2.7), and cellulose triacetate is hydrolyzed to obtain Cellulose diacetate (substitution degree is 2.4-2.6), the reaction process is shown in the following formula.

[0003] Cellulose triacetate is widely used in films, polari...

Claims

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