Preparation method for Chinese red pine dissolving pulp

A technology of masson pine and dissolving pulp, which is applied in the direction of spinning solution preparation, chemical preparation of bast fiber, fiber chemical characteristics, etc., can solve the problems of complex process flow and high consumption of chemical preparations, and achieve environmental pollution reduction, chemical preparations and The effect of energy consumption reduction

Inactive Publication Date: 2009-02-18
福建省南平南纸有限责任公司
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Problems solved by technology

From the known preparation method of producing masson pine dissolving pulp, its main disadvantages are: complex technological process, higher consumption of energy and chemical preparations

Method used

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  • Preparation method for Chinese red pine dissolving pulp

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Embodiment Construction

[0037] A preparation method for masson pine dissolving pulp, comprising the following steps:

[0038] 1) Prepare materials, select 5-10-year-old Masson pine and cut it into sheets with a specification of 25×25×5, and the moisture content of Masson pine is 40%.

[0039] 2) steam prehydrolysis, divided into three stages:

[0040] In the first stage, the initial temperature is raised to 130°C, and the heating time is 40 minutes. After the temperature is raised to 130°C, the air is released once for 5-10 minutes;

[0041] In the second stage, from 130°C to 172°C, the pressure rises to 7.5kg / cm 2 , heating time 30min;

[0042] The third stage, temperature 172 ℃, pressure 7.5kg / cm 2 , keep warm for 50min;

[0043] Finally, drain the liquid. This liquid is called waste acid. The pH value of waste acid is about 3.5. It should be drained as clean as possible. If it is not drained, the amount of alkali used in alkali boiling will be greatly increased. The time is 20 minutes, and the...

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Abstract

The invention discloses a preparation method for masson pine dissolving pulp, including the following steps: 1) material preparation; 2)steam prehydrolysis; 3) alkali cooking; 4)washing, filtration and desanding; 5) bleaching; 6) acid treatment; 7) bleaching and filtration; and 8)pulping. Compared with prior art, the masson pine dissolving pulp prepared through the method is increased in the purity and the content of methyl cellulose, and the purity and the content of methyl cellulose are increased by 1.5-2.5% as compared with the prior art. The product can be further improved, and the consumption of chemical reagents and energy are reduced and the pollution to the environment is further reduced.

Description

technical field [0001] The invention relates to a preparation method of masson pine dissolving pulp, in particular to a preparation method of masson pine dissolving pulp used in the textile and chemical fiber industry. Background technique [0002] Masson pine is a widely distributed fast-growing wood in the south, and it is a high-quality raw material for the pulp and paper industry. Masson pine pulp produced by the kraft process is commonly used in papermaking. Masson pine dissolving pulp is mainly used as raw material for man-made fibers and textile fibers, and its requirement is high purity and high content of cellulose A in masson pine dissolving pulp. [0003] Chinese patent 93121600.1 discloses a method for producing viscose silk pulp, which uses lignocellulose commonly used in pulping and papermaking to prepare viscose silk pulp. Viscose silk pulp is regenerated fiber, which is used to make artificial fiber, cellophane, carboxymethyl cellulose, nitrocellulose, cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/02D01D1/02D01F2/00
Inventor 吴冰文林孝帮叶世城郑飞
Owner 福建省南平南纸有限责任公司
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