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Process for producing (meth)acrylic acid

A technology of acrylic acid and methyl, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., and can solve problems such as insufficient inhibition of polymerization reactions

Active Publication Date: 2005-11-16
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, those countermeasures alone are not enough to suppress the polymerization reaction in the (meth)acrylic acid purification step, and the emergence of higher-level polymerization prevention technology is required in order to achieve stable continuous operation.

Method used

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  • Process for producing (meth)acrylic acid
  • Process for producing (meth)acrylic acid

Examples

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Embodiment 1

[0065] A distillation column having a diameter of 1,000 mm, equipped with a reboiler at the bottom of the column, a condenser at the top of the column, and 30 corrugated trays inside the distillation column was used as an azeotropic distillation column. The outlet of the condenser is connected with vacuum equipment. The reboiler is installed in the circulation line to circulate the liquid at the bottom of the azeotropic distillation column by extracting part of the liquid at the bottom of the azeotropic distillation column (column bottom liquid) from the bottom of the column, and to supply the bottom liquid to the azeotropic distillation column again .

[0066] A receiver for receiving condensate formed in the condenser is provided between the condenser and the vacuum apparatus. Pipes, etc., are optionally connected to the receiver to reflux each portion of the top and bottom layers of the condensate received independently to the azeotropic distillation column or to extract e...

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Abstract

The present invention provides a method for suppressing an undesirable polymerization reaction of (meth)acrylic acid in a purification step for producing (meth)acrylic acid and for avoiding troubles due to clogging of devices or the like, to thereby attain a stable continuous operation. The present invention provides a method for producing (meth)acrylic acid comprising: distilling a water-containing liquid of (meth) acrylic acid containing (meth)acrylic acid and water by using a distillation column in the presence of an azeotropic solvent boiling together with at least water to remove water from the water-containing liquid of (meth)acrylic acid through azeotropy with the azeotropic solvent, in which the water-containing liquid of (meth)acrylic acid is distilled in the presence of the azeotropic solvent after distillation by the azeotropic solvent is carried out in the distillation column.

Description

technical field [0001] The present invention relates to a method for producing (meth)acrylic acid, and more particularly to a method for producing (meth)acrylic acid capable of stably purifying (meth)acrylic acid by distillation using a distillation tower over a long period of time, Simultaneously prevent the polymerization of (meth)acrylic acid in the purification of (meth)acrylic acid solution by gas-phase catalytic oxidation of propane, propene, acrolein, isobutene or tert-butanol and obtained. [0002] In this specification, "(meth)acrylic acid" is a generic term for acrylic acid and methacrylic acid, and may refer to any one or both of them. Background technique [0003] (Meth)acrylic acid is industrially very important as a raw material for superabsorbent polymers or as a raw material for various (meth)acrylates. (Meth)acrylic acid has recently been produced by gas-phase catalytic oxidation of propane, propylene, isobutylene, and the like. However, (meth)acrylic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/46C07C57/07
CPCC07C51/46C07C57/04
Inventor 矢田修平高崎研二铃木芳郎小川宁之
Owner MITSUBISHI RAYON CO LTD