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Prehydrolysis additive for dissolving pulp production and preparation method thereof

A technology of pre-hydrolysis and dissolving pulp, which is applied in the direction of pulping with acid acid/anhydride, which can solve the problems affecting the application of dissolving pulp and the high ash content of dissolving pulp, so as to protect from degradation, improve the removal rate, The effect of reducing the content

Active Publication Date: 2014-12-10
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these metal ions cannot be effectively removed during the production of dissolving pulp, it will lead to high ash content in dissolving pulp, especially iron content, which will affect the application of dissolving pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 10kg of fatty alcohol polyoxyethylene ether, 35kg of sodium bisulfite, 5kg of sodium hexametaphosphate, 5kg of oxalic acid, and 5kg of citric acid, and mix the above components uniformly at room temperature for 30 minutes to obtain the finished hydrolysis aid. It can leave the factory after discharging and bagging.

[0024] Bamboo slices from a paper mill in Sichuan were taken, and the analysis showed that the hemicellulose content was 21.68%, the ash content was 1.63%, and the lignin content was 25.45%. It was subjected to steam prehydrolysis, and the results are shown in Table 1.

[0025] Table 1 Contents of chemical components of tablets after prehydrolysis

[0026] Auxiliary dosage ( %) 0.0 0.5 0.7 1.0 Hemicellulose (to raw material) (%) 11.75 9.91 9.48 8.92 Hemicellulose removal rate (to raw material) (%) 45.80 54.29 56.27 58.86 Ash content (to raw materials) (%) 1.32 1.10 0.89 0.82 ...

Embodiment 2

[0030] Weigh 5kg fatty alcohol polyoxyethylene ether, 5kg alkylphenol polyoxyethylene ether, 35kg sodium bisulfite, 5kg sodium hexametaphosphate, 5kg oxalic acid, 5kg citric acid, and mix the above components uniformly at room temperature for 60 Minutes, it is the finished hydrolysis aid, and it can leave the factory after discharging and bagging.

[0031] Poplar wood chips from a paper mill in Henan were taken, and the analysis showed that the hemicellulose content was 23.19%, the ash content was 0.47%, and the lignin content was 18.22%. It was subjected to water prehydrolysis, and the results are shown in Table 2.

[0032] Table 2 Contents of chemical components of tablets after prehydrolysis

[0033] Auxiliary dosage ( %) 0.0 0.5 0.7 1.0 Hemicellulose (to raw material) (%) 12.37 10.62 9.78 8.61 Hemicellulose removal rate (to raw material) (%) 46.65 54.20 57.83 62.87 Ash content (to raw materials) (%) 0.36 ...

Embodiment 3

[0036] Weigh 30kg of fatty alcohol polyoxyethylene ether, 75kg of sodium bisulfite, 25kg of sodium hexametaphosphate, 15kg of oxalic acid, and 15kg of citric acid, and mix the above components uniformly at room temperature for 60 minutes to obtain the finished hydrolysis aid. It can leave the factory after discharging and bagging.

[0037] Self-provided masson pine wood chips, the analysis shows that the hemicellulose content is 8.65%, the ash content is 0.43%, and the lignin content is 28.52%. It was prehydrolyzed with hydrochloric acid, and the results are shown in Table 3.

[0038] Table 3 Contents of chemical components of tablets after prehydrolysis

[0039] Auxiliary dosage ( %) 0.0 0.5 0.7 1.0 Hemicellulose content (to raw material) (%) 4.87 4.16 3.87 3.65 Hemicellulose removal rate (to raw material) (%) 43.70 51.91 55.26 57.80 Ash content (to raw material) (%) 0.34 0.30 0.24 0.21 Ash remov...

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Abstract

The invention discloses a prehydrolysis additive for dissolving pulp production and a preparation method thereof, and aims at solving the problems that in current dissolving pulp production process, less hemicellulose is removed in a prehydrolysis phase, which causes high pulp hemicellulose content, high ash (especially iron ion) content, or the pulp viscosity is greatly decreased during great hemicellulose removal; the prehydrolysis additive comprises the following components by weight: 10-30 parts of a nonionic surfactant, 5-25 parts of sodium hexametaphosphate, 35-75 parts of hydrosulphite, 5-15 parts of oxalic acid, and 5-15 parts of citric acid. The prehydrolysis additive provided in the invention can effectively improve the removal of hemicellulose and lignin, reduce lignin condensation during prehydrolysis, protect cellulose from degradation, reduce pulp hardness after boiling, thus effectively reduce the using amount of chemical medicines in a subsequent bleaching process, reduce production cost, and reduce pollution load.

Description

technical field [0001] The invention relates to the field of producing dissolving pulp by using wood and non-wood plant fiber raw materials, in particular to a prehydrolysis auxiliary agent for dissolving pulp production and a preparation method thereof. Background technique [0002] In recent years, with the rapid economic development and the continuous improvement of people's living standards, the demand for dissolving pulp is also increasing. Dissolving pulp is also called special pulp, or refined pulp, which is mainly used to produce viscose fiber as textile raw material. In addition, dissolving pulp is also the raw material of cellophane, sterilized filter paper in the pharmaceutical industry, cellulose acetate (raw material for cigarette over-mouth rod), nitrocellulose, carboxymethyl cellulose, microcrystalline cellulose and other products. With the rapid development of the textile industry, the contradiction between supply and demand of various fiber raw materials is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/04D21C3/12
Inventor 李文俊杨玲谢斌
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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