Method for producing alkali cellulose comprising removal of cellulose particles

一种碱纤维素、碱金属的技术，应用在生产碱纤维素领域，能够解决碱纤维素碱分布不均匀等问题，达到抑制透光度的下降、提高抑制、防止脱液效率的下降的效果

Active Publication Date: 2012-08-22
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One reason is the uneven distribution of alkali in alkali cellulose

Method used

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  • Method for producing alkali cellulose comprising removal of cellulose particles
  • Method for producing alkali cellulose comprising removal of cellulose particles
  • Method for producing alkali cellulose comprising removal of cellulose particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] A pipe with an inner diameter of 38 mm and a length of 10 m is installed. A serpentine pump equipped with a hopper (NVL40PL type produced by Heishin Ltd.) was connected to the inlet of the pipe, and a 44% by weight aqueous sodium hydroxide solution at 40° C. was fed to the serpentine pump at a rate of 900 L / h from a cylindrical tank. hopper. Simultaneously, 4mm 4mm wood derived from wood with a solids content of 93% by weight was introduced at a rate of 50 kg / h. 2 pulp crumbs. The outlet of the tube was connected to a screw discharge type continuous rotary frame in which the contact mixture between the pulp chips and the sodium hydroxide solution discharged from the tube was continuously deliquored at a centrifugal efficiency of 1,150. The weight ratio of the alkali metal hydroxide in the obtained alkali cellulose to the solid component in the pulp was determined by a titration method and found to be 1.25.

[0080] The liquid portion obtained by deliquoring was retur...

Embodiment 2

[0084] Alkali cellulose was prepared in the same manner as in Example 1 except that nitrogen gas was used to bubble the liquid phase in the tank at a rate of 0.15 L / min. The concentration of cellulose particles in the liquid phase in the tank after 100 hours of operation was 0.10% by weight. The weight ratio of the alkali metal hydroxide in the obtained alkali cellulose to the solid component in the pulp was 1.25.

[0085] Hydroxypropylmethylcellulose was produced in the same manner as in Example 1, using the alkali cellulose obtained after 100 hours of operation as a raw material. The results are shown in Table 1.

Embodiment 3

[0087] Alkali cellulose was prepared in the same manner as in Example 1 except that the liquid at the bottom of the tank was drawn at a rate of 500 L / h and the liquid portion obtained by deliquification was dropped into the tank from the top of the tank. The concentration of cellulose particles in the liquid phase in the tank after 100 hours of operation was 0.10% by weight. The weight ratio of the alkali metal hydroxide in the obtained alkali cellulose to the solid component in the pulp was 1.25.

[0088] Hydroxypropylmethylcellulose was produced in the same manner as in Example 1, using the alkali cellulose obtained after 100 hours of operation as a raw material. The results are shown in Table 1.

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Abstract

There is provided a method for producing alkali cellulose comprising efficiently removing cellulose particles which are introduced by a pulp and have accumulated in a circulating alkali metal hydroxide solution. More specifically, there is provided a method for producing alkali cellulose, comprising at least the steps of bringing a pulp into contact with an alkali metal hydroxide solution to obtain a contact product, draining the contact product by a drainer, reusing an alkali metal hydroxide solution recovered in the step of draining for contact with a pulp, and adjusting an amount of cellulose particles in the recovered alkali metal hydroxide solution to 0.5% by weight or less prior to reusing for contact with the pulp.

Description

technical field [0001] The present invention relates to a method for producing alkali cellulose and a method for producing cellulose ether by using the alkali cellulose. Background technique [0002] A method of producing cellulose ether is known in which highly purified pulp is brought into contact with an alkaline solution to form alkali cellulose, and the alkali cellulose is subjected to an etherification reaction by using an etherifying agent. By sufficiently controlling the degree of substitution, the finally obtained cellulose ether becomes water-soluble. However, the water-insoluble part still exists therein to reduce the transmittance of its aqueous solution or to reduce commercial value as a pollutant. [0003] The insoluble portion is caused by a low-substituted portion having an insufficient amount of substituents to be insoluble in water. One reason is that the alkali distribution in the alkali cellulose is not uniform. [0004] The activity of this base inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B1/08C08B11/00
CPCC08B1/08C08B11/00C08B11/193
Inventor 成田光男
Owner SHIN ETSU CHEM CO LTD
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