High-quality polymerization inhibitor and preparation technology of same

A manufacturing process and technology of polymerization inhibitor, applied in the field of high-grade polymerization inhibitor and its manufacturing process, can solve the problems of high cost, difficult to achieve 99% purity, strong heat sensitivity of products, etc., and achieve the effect of high added value

Inactive Publication Date: 2013-04-10
南通市振兴精细化工有限公司
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AI Technical Summary

Problems solved by technology

Because the reaction of this product is violent when it is synthesized, the present invention adopts the Venturi tube mixing and dropping method, and the reaction is mild; the product is highly heat-sensitive, and the purity is difficult to reach 99%. At present, the development of this product in China is still in the small test stage.
According to the current situation in China, the cost of using the refining process is high and the yield is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation methods Tetramethylpiperidinol, acetaldehyde, 50% hydrogen peroxide.

[0018] (a) In a 500ml four-necked flask equipped with a condenser, a reflux tube, a thermometer and a stirrer, add quantitatively 15.7g of 2,2,6,6-tetramethyl-4-piperidinol, 11g of ethyl alcohol Put the aldehyde into the synthesis kettle, start the agitator at 65-68°C, start mixing and adding hydrogen peroxide, and start heating the reactor at the same time, keep it warm at 65-68°C for 10 hours, and the sampling test is qualified; filter; then use molecular distillation Obtain qualified products, increase yield, reduce consumption and improve product quality.

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Abstract

The invention discloses high-quality 4-methoxyl-2, 2, 6, 6-tetramethylpiperidinol (polymerization inhibitor 705 for short) and a preparation technology of the same. The high-quality polymerization inhibitor is prepared by the processes of: firstly, preparing tetramethylpiperidinol, and then, carrying out mixing, oxidizing, filtering, molecular distillation, packaging and on the like. The technology for preparing the polymerization inhibitor 705 comprises carrying out oxidization on tetramethylpiperidinol and acetaldehyde. According to the technology disclosed by the invention, the polymerization inhibitor 705 is obtained by molecular distillation and purification, thus, high-quality products can be provided for the clients and the company.

Description

technical field [0001] The invention relates to a manufacturing process of a high-grade polymerization inhibitor 705, which is a method by changing the refining process into a molecular distillation process. Background technique [0002] High-grade polymerization inhibitor 705 has good polymerization inhibition effect on acrylate substances. As a high-grade polymerization inhibitor, the added value of this product is extremely high. Because reaction is violent when this product is synthesized, the present invention adopts Venturi tube mixing and dripping method, and reaction is gentle; Product thermosensitivity is extremely strong, and purity is difficult to reach 99%, and the development of this product is still in the small-scale test stage in China at present. According to the current situation in China, the cost of using the refining process is high and the yield is low. The present invention uses molecular distillation to purify and obtain high-grade polymerization inh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D211/94
Inventor 陈建华徐鸿彬夏跃雄
Owner 南通市振兴精细化工有限公司
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