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Catalyst for lowering N-vinyl-2-pyrrolidone in polyvinylpyrrolidone (PVP), and preparation method and application thereof

A technology of polyvinylpyrrolidone and vinylpyrrolidone, which is applied in the field of catalysts, can solve the problems of low production capacity, increased equipment investment, etc., and achieves the effects of low cost, industrialized production, and simple use method.

Active Publication Date: 2013-01-30
SICHUAN CHEM IND HLDG GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can reduce the content of residual monomer NVP in the PVP product to below 10ppm, but the disadvantage of this method is that it is necessary to add a set of ultrasonic devices to the existing industrial equipment, increase the investment of equipment, and the production capacity is low

Method used

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  • Catalyst for lowering N-vinyl-2-pyrrolidone in polyvinylpyrrolidone (PVP), and preparation method and application thereof
  • Catalyst for lowering N-vinyl-2-pyrrolidone in polyvinylpyrrolidone (PVP), and preparation method and application thereof
  • Catalyst for lowering N-vinyl-2-pyrrolidone in polyvinylpyrrolidone (PVP), and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to the mass ratio of nitric acid and natural diatomite 1:1, measure nitric acid and natural diatomite with a concentration of 0.25N, soak the natural diatomite with nitric acid with a concentration of 0.25N at room temperature and normal pressure for 3 hours, and the soaking time expires Finally, solid-liquid separation, the separated diatomite was washed 3 times with deionized water, dried in the air, then put into an oven, and dried at normal pressure at 100°C for 12 hours to obtain powdery refined diatomite A.

Embodiment 2

[0031] According to the mass ratio of nitric acid and natural diatomite 2:1, measure nitric acid and natural diatomite with a concentration of 0.25N, soak the natural diatomite with nitric acid with a concentration of 0.25N at room temperature and normal pressure for 5h, and the soaking time expires Finally, solid-liquid separation, the separated diatomite was washed 5 times with deionized water, dried in the air, then put into an oven, and dried at 120°C under normal pressure for 10 hours to obtain powdery refined diatomite B.

Embodiment 3

[0033] According to the mass ratio of nitric acid and natural diatomite 3:1, measure nitric acid and natural diatomite with a concentration of 0.25N, soak the natural diatomite with nitric acid with a concentration of 0.25N at room temperature and normal pressure for 6 hours, and the soaking time expires Finally, solid-liquid separation, the separated diatomite was washed 6 times with deionized water, dried in the air, then put into an oven, and dried at normal pressure and 150°C for 6 hours to obtain powdery refined diatomite C.

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Abstract

The invention relates to a preparation method of a catalyst for lowering residual monomer N-vinyl-2-pyrrolidone in polyvinylpyrrolidone (PVP). The catalyst is prepared from the following raw materials in percentage by mass: 50-70% of refined kieselguhr, 5-20% of aluminiferous compound, 5-20% of binding agent, 1-2% of pore-enlarging agent and 10-20% of active component. The preparation method comprises the following steps: (1) measuring the refined kieselguhr, aluminiferous compound, binding agent, pore-enlarging agent and active component according to the percentage by mass, evenly mixing, and regulating with a diluter to obtain a paste material satisfying the extrusion requirement, wherein the diluter is hydrochloric acid, nitric acid or phosphoric acid; and (2) carrying out extrusion forming on the paste material obtained in the step (1), airing the parison, and roasting to obtain the catalyst. The catalyst provided by the invention can be used for lowering the content of the residual monomer N-vinyl-2-pyrrolidone in the PVP, wherein the PVP is PVP K15, PVP K30, PVP K60, PVP K90, PVP K120 or PVPP.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a catalyst for reducing the content of residual N-vinylpyrrolidone monomers in polyvinylpyrrolidone polymers, a preparation method and application thereof. Background technique [0002] Polyvinylpyrrolidone (PVP for short) is a non-ionic polymer compound, which is polymerized by monomer N-vinylpyrrolidone (NVP for short) under the action of an initiator. According to different molecular weights, its products are mainly divided into PVP K15, PVP K30, PVP K60, PVP K90, PVP K120 and PVPP. Polyvinylpyrrolidone with different molecular weights exhibits different functional properties and is used in different fields. Its linear polymer products are easily soluble in water, and can be miscible or compounded with various high-molecular and low-molecular substances. Therefore, it is widely used in chemical fields such as medicine, daily chemical, food, paint, and new materials. It is an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F26/10C08F6/10
Inventor 吴勇赵世比刘明刚魏先全周珂阳杨东刘孔满徐家富张利周志明
Owner SICHUAN CHEM IND HLDG GRP
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