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Composite polymerzation inhibitor for producing methyl propenoic acid and its ester

A composite polymerization inhibitor, methacrylic acid technology, applied in the preparation of carboxylate, the separation/purification of carboxylic acid compounds, the preparation of organic compounds, etc. Large synergistic effect, the effect of preventing polymerization and inhibiting the ability of oxidation

Active Publication Date: 2008-03-12
SHANGHAI HUAYI NEW MATERIAL
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AI Technical Summary

Problems solved by technology

Since the electron-donating properties of methacrylic acid and its esters are weaker than those of styrene, the polymerization inhibition effect is relatively reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0010] Under the conditions of no air and a temperature of 120 ° C, using MAA raw materials with a purity of 99.8%, 2,2,6,6-tetramethyl 4-hydroxypiperidine nitroxide radical compound (ZJ-705) or phosphorous acid- The complex of 3-(2,2,6,6-tetramethyl-4-hydroxypiperidinyl nitroxide) ester (ZJ-7056) and copper salt is used as a polymerization inhibitor in a 50ml pear-shaped bottle Silicone oil was heated for polymerization inhibition experiment, and the results are shown in Table 1.

[0011] Table 1 Binary composite polymerization inhibitor experimental results

[0012]

Embodiment 5-6

[0014] Experimental condition is the same as embodiment 1. The raw material is the solvent phase of the methacrylic acid aqueous solution produced by the catalytic oxidation of tert-butanol or isobutene after solvent extraction (composition: 0.76% of water, 79.06% of toluene, 2.86% of acetic acid, 1.49% of acrylic acid, and 14.97% of methacrylic acid), and Add 300ppm of binary composite polymerization inhibitor, and use a small glass sieve plate tower to carry out continuous rectification and desolventization at the bottom temperature of the rectification tower at 94°C and a vacuum degree of 13kPa. The experimental results are shown in Table 2.

[0015] The polymerization inhibition experiment result under the continuous rectification condition of table 2

[0016]

Embodiment 7-10

[0018] Experimental condition is the same as embodiment 1. Methyl methacrylate with a content of 99.5% was used as a raw material, and a polymerization inhibition experiment was carried out in a 50 ml pear-shaped bottle by heating with silicone oil, and the results are shown in Table 3.

[0019] Table 3 Binary composite polymerization inhibitor experimental results

[0020]

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Abstract

The present invention relates to a kind of composite polymerization inhibitor for the production process of methylacrylic acid and its ester. The composite polymerization inhibitor is re-compounded with nitrogen and oxygen free radical type compound and copper salt type polymerization inhibitor. The composite polymerization inhibitor has high polymerization inhibiting effect and no requirement on oxygen content in the material system.

Description

technical field [0001] The invention relates to a composite polymerization inhibitor developed for preventing the polymerization of materials (methacrylic acid and its esters) during the production process of methacrylic acid and its esters. Background technique [0002] During the production (such as esterification, rectification or extraction) and storage and transportation of methacrylic acid (MAA) and its esters, due to the unsaturated carbon-carbon double bonds and carboxyl groups or esters in the molecular structure of methacrylic acid and its esters The base has extremely strong polymerization characteristics and is very easy to undergo polymerization reactions. Once polymerization occurs (sometimes implosion occurs, causing the entire material to condense into a block), it will not only cause production stoppage, but even cause damage to the entire equipment. Therefore, preventing the polymerization of MAA and its esters is very critical and is an important link in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/50C07C57/04C07C67/62C07C69/54
Inventor 马建学刘书举张庆怀罗明陨汪青海邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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