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Method of distilling liquid containing easily polymerizable compound

A distillation method and compound technology, applied in the field of distillation, can solve problems such as unfavorable economy, and achieve the effect of inhibiting polymerization

Active Publication Date: 2010-03-24
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, in order to suppress the generation of polymers in the distillation apparatus, it is necessary to introduce a complicated polymerization inhibition system, which becomes economically disadvantageous.

Method used

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  • Method of distilling liquid containing easily polymerizable compound
  • Method of distilling liquid containing easily polymerizable compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0057] Hereinafter, the present invention will be described in more detail by way of production examples, examples and comparative examples, but the present invention is not limited to these examples.

manufacture example

[0059] A distillation device made of SUS316 with a capacity of 2000L (simple distillation form. A multi-tube reboiler is set as a heating source, and a circulation pump is used for forced circulation.) is evacuated until the internal pressure reaches 5.33hPa, and then 1150kg (93.5% by mass) is fed ) a liquid containing hydroxyethyl methacrylate (hereinafter referred to as "HEMA") obtained from the reaction of methacrylic acid and ethylene oxide, and 0.12kg of p-methoxyphenol and 0.20kg of phenothiazine as polymerization inhibitors , steam was passed into the reboiler, and the distillation of the above-mentioned HEMA-containing liquid was started.

[0060] Distillation started when the liquid temperature reached 70°C, and was kept constant at 85°C thereafter. Distillation was terminated when the distilled amount reached 980 kg (85.2% by mass of the initial feed liquid), and 170 kg of distillation tower bottom liquid was obtained. Thereafter, the entire amount of the obtained d...

Embodiment 1

[0062] (first distillation)

[0063] In the same distillation apparatus as in the production example, feed 1150 kg of HEMA-containing liquid obtained by the reaction of methacrylic acid and ethylene oxide and 0.12 kg of p-methoxyphenol and 0.20 kg of phenothiene as a polymerization inhibitor. Zinc, start distillation.

[0064] From the moment when the amount of distillate reached 810 kg (70.4% by mass of the initial feed liquid), 62 kg (5.4% by mass of the initial feed liquid) of the distillation bottom liquid obtained in the production example was supplied to the distillation apparatus using a liquid delivery pump, Continue to distill. After 3.5 hours from the start of distillation, distillation was stopped when the amount of distillate reached 1100 kg (95.7% by mass of the initial feed liquid).

[0065] After the distillation was completed, 112 kg of residual tower bottom liquid remaining in the distillation apparatus was transferred to the same waste oil storage tank as i...

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Abstract

A method of batch simple distillation of a liquid containing an easily polymerizable compound that, in the batch simple distillation of a liquid containing an easily polymerizable compound, such as (meth)acrylic acid, attains preventing of polymerization inside a distillation apparatus and reducing of the amount of residual liquid discarded as a waste oil. Whenever the amount of distillate is 70%or more of the amount of liquid initially charged in the distillation apparatus, the distillation residual liquid is introduced in a distillation apparatus of simple distillation mode and distillation is continued.

Description

technical field [0001] The present invention relates to a method for distillation of a liquid containing an easily polymerizable compound. Specifically, the present invention relates to a method for distilling liquids containing easily polymerizable compounds such as (meth)acrylic acid and (meth)acrylate. More specifically, the present invention relates to a distillation method that does not discard as it is after the completion of the distillation when a liquid containing easily polymerizable compounds such as (meth)acrylic acid and (meth)acrylate is simply distilled intermittently. Instead of the distillation bottoms liquid remaining in the distillation apparatus, the polymerization inhibitor contained in the distillation bottoms liquid is effectively used by recycling a part of the distillation bottoms liquid in the distillation apparatus. Background technique [0002] Refinement of easily polymerizable compounds such as (meth)acrylic acid and (meth)acrylic acid esters b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/54C07C51/44C07C57/07C07C69/54
CPCC07C67/54C07C51/44C07C57/04C07C69/54B01D3/141C07C67/48Y10S203/00
Inventor 石田德政上村政宏
Owner NIPPON SHOKUBAI CO LTD
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