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Production method and apparatus of polyvinyl alcohol

A polyvinyl alcohol and production method technology, applied in the field of polyvinyl alcohol production devices, can solve the problems of reducing market competitiveness, reducing product quality, increasing production costs, etc., and achieving enhanced market competitiveness, convenient operation, and increased time and area effect

Active Publication Date: 2017-01-04
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methanol content is controlled by increasing the drying temperature. Affected by the characteristics of the polyvinyl alcohol product itself, as the temperature rises, it becomes more difficult for the methanol inside the material to evaporate, and as the drying temperature increases, the material consumption and hue need to be increased. Deterioration not only increases production costs, but also reduces product quality, thereby reducing market competitiveness

Method used

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  • Production method and apparatus of polyvinyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1, the production method of polyvinyl alcohol (PVA 18-99), the production device see figure 1, including alcoholysis machine 1, pulverizer 2 and dryer 3, pulverizer 2 includes first pulverizer 2-1 and second pulverizer 2-2 and is connected, first pulverizer 2-1 is connected with alcoholysis machine 1 , the second pulverizer 2-2 is connected with the dryer 3, and the second pulverizer 2-2 is connected with the substituent delivery system 4; The machine 2-2 is connected with the dryer 3; one way of the substitute agent input pipeline 4-1 is connected with the refined methanol delivery pipeline 4-3 and the additive liquid delivery pipeline 4-4 through a pipeline mixer 4-2, and the other way of the substitute agent input pipeline is 4-1 is connected with refined methanol delivery pipeline 4-3 and additive liquid delivery pipeline 4-4 through another pipeline mixer 4-2. The refined methanol delivery pipeline 4-4 is provided with a flowmeter 4-5 and a control valve 4...

Embodiment 2

[0037] Example 2, the production method of polyvinyl alcohol PVA24-97, the production device is as in Example 1, including the following steps: after adjusting the polyvinyl acetate-methanol solution with a mass concentration of 30% to a specified temperature of 40-50 ° C, enter the mixing machine, the caustic soda-methanol solution with a water content of 20% also enters the mixer, and the two materials are fully mixed in the mixer and then enter the alcoholysis machine 1 for alcoholysis reaction. During the mixing process, the water in the caustic soda-methanol solution be evenly distributed inside the material. The uniformly mixed material reacts while being conveyed in the belt type alcoholysis machine. The material changes from liquid to solid, and then enters the first pulverizer 2-1 to be pulverized into strip-shaped materials, and the strip-shaped materials enter the second pulverizer 2-2 to be crushed. Grinding into granular materials, one-third of the methyl acetate-...

Embodiment 3

[0044] Embodiment 3, polyvinyl alcohol （ PVA 088-04) production method, production equipment see figure 1 , including the following steps: after adjusting the polyvinyl acetate-methanol solution with a mass concentration of 40% to a temperature of 40-50°C, adding it to a mixer, and adding a caustic soda-methanol solution with a water content of 10% to the mixer at a rate of 100 ~400 l / h, after being fully mixed, enter the alcoholysis machine 1 for alcoholysis reaction. During the mixing process, the water in the caustic soda-methanol solution is evenly distributed inside the material; the uniformly mixed material is in the alcoholysis machine 1. Reacting while conveying, the material changes from liquid to solid, and then enters the pulverizer 2 to be pulverized into specified particles. The material first enters the first pulverizer 2-1 to be pulverized into strip materials, and then enters the second pulverizer 2-2 to be pulverized into granular materials. One-third of the ...

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Abstract

The invention relates to a production method of polyvinyl alcohol. A polyvinyl alcohol product is obtained by adopting polyvinyl acetate-methanol as a raw material, adopting caustic soda-methanol as a catalyst, adopting methyl acetate-methanol-aqueous solution as a substitution agent by virtue of steps such as alcoholysis, pulverizing and drying; and the methyl acetate-methanol-aqueous solution is distributed in the pulverizing step and the drying step. An apparatus used in the production method comprises an alcoholysis machine, a pulverizing machine and a drying machine, which are successively connected with one another, and the pulverizing machine and the drying machine are respectively connected with a substitution agent adding system. By adopting the production method, the contact time and contact area between water and materials are increased, the effect of substituting methanol by the water is improved, and the content of the methanol in the materials is effectively reduced. The polyvinyl alcohol production apparatus can effectively control the flow quantity, total amount and water content of the substitution agent added into the pulverized material and the dried material, and is convenient to operate and simple in structure.

Description

technical field [0001] The invention relates to a production method of polyvinyl alcohol and also relates to a production device of the polyvinyl alcohol. Background technique [0002] Polyvinyl alcohol is a water-soluble polymer with a wide range of uses. Because polyvinyl alcohol has unique strong adhesive properties, film flexibility, smoothness, oil resistance, solvent resistance, protective colloid properties, gas barrier properties, abrasion resistance and water resistance after special treatment, it is not only used as fiber In addition to raw materials, it is also widely used in the production of coatings, adhesives, paper processing agents, emulsifiers, dispersants, films and other products, and its application range covers cosmetics, food, medicine, textiles, construction, wood processing, papermaking, printing, Agriculture, iron and steel, polymer chemical industry and other industries. The production process of polyvinyl alcohol is mainly composed of three unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F118/08C08F8/00
Inventor 刘世均黄勇秦庆伟杨坤尹富强
Owner CHINA PETROCHEMICAL CORP
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