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Method for reducing N oxo-compound

A compound and oxygen technology, applied in the field of reducing N-oxyl compounds contained in easily polymerizable substances, can solve problems such as decreased stability and increased acid value

Inactive Publication Date: 2002-11-06
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, this publication also discloses that in the case of proposing the use of activated clay in Japanese Patent Publication No. 59-38254 (corresponding to Japanese Unexamined No. 50-145449), since physical adsorption and electrostatic adsorption are main, activated clay and Positive ion exchange occurs between metal ions remaining in the ester, and protons are released. As a result, there are problems such as an increase in the acid value of the ester and a decrease in stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 100 g of MMA containing 100 ppm of N-oxyl compound 8 and 0.5 g of activated clay Galeona-su GSF (manufactured by Mizusawa Chemical Industry Co., Ltd.) were added to a 300 ml four-necked flask, and stirred at room temperature for 60 minutes. The treated solution after stirring was filtered with a membrane filter (pore diameter: 0.5 μm) to obtain 98.7 g of MMA (98.7% recovery rate). The N-oxyl compound 8 contained in this MMA was below the quantitative limit (0.1 ppm).

Embodiment 2

[0044] The N-oxyl compound reduction treatment was carried out in the same manner as in Example 1, except that 100 g of MMA containing 20 ppm of the N-oxyl compound 1 was used as a polymerization inhibitor. The obtained MMA was 98 g (98% recovery), and the N-oxyl compound 1 contained therein was below the quantitative limit (0.1 ppm). Example 3

Embodiment 3

[0045] The N-oxyl compound reduction treatment was carried out in the same manner as in Example 1 except that 100 g of ethylene glycol dimethacrylate was used instead of MMA. The obtained ethylene glycol dimethacrylate was 98.5 g (98.5% recovery rate), and the N-oxyl compound 8 contained in it was below the quantitative limit (0.1 ppm).

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PUM

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Abstract

The present invention provides an excellent method for reducing N-oxyl compounds that can sufficiently reduce N-oxyl compounds contained in easily polymerizable substances with little loss of easily polymerizable substances. The easily polymerizable substance containing the N-oxyl compound is brought into contact with the acid. Furthermore, not only N-oxyl compounds but also organic titanium group compounds contained in easily polymerizable substances can be sufficiently reduced.

Description

technical field [0001] The present invention relates to a method for reducing N-oxyl compounds contained in easily polymerizable substances, and particularly relates to a method for reducing N-oxyl compounds contained in (meth)acrylic acid or (meth)acrylate. The present invention further relates to a method for reducing an organic titanium group compound contained in an easily polymerizable substance. Background technique [0002] Japanese Patent Application Laid-Open No. 50-145449 discloses a method for improving the properties of an ester plasticizer. In the presence of a catalyst, the ester obtained by reacting an alcohol with a specific carbon number with an aromatic acid or a fatty acid with a specific carbon number Process for the preparation of ester plasticizers in contact with activated clay, magnesium oxide and / or calcium oxide in the presence of water. According to this method, impurities such as unreacted acids, monoesters, catalysts, side-reaction products, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D211/94C07D235/02C07D471/10
CPCC07D211/94C07D235/02C07D471/10
Inventor 德田正德吉田康一
Owner MITSUBISHI CHEM CORP
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