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Method of producing (meth)acrylic acid or ester thereof

A manufacturing method and technology of acrylic acid, applied in the field of manufacturing acrylic acid or its ester acrylic acid "), can solve the problems of low density, device clogging, high polymerization, etc., and achieve the effects of improving recovery rate, preventing clogging, and improving vacuum degree

Active Publication Date: 2020-08-21
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vapor pressure of most of the polymerization inhibitors is lower than that of (meth)acrylic acid, and in most cases, the added polymerization inhibitor is hardly included in the volatilized gas of (meth)acrylic acid
It is considered that even if no polymerization inhibitor is contained, the (meth)acrylic acid in the gas state has a low density, so the polymerization reaction does not substantially occur, but once the gas is condensed to form a condensate, the condensate has a high degree of polymerization. caused by the blockage of the device, etc.

Method used

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  • Method of producing (meth)acrylic acid or ester thereof
  • Method of producing (meth)acrylic acid or ester thereof
  • Method of producing (meth)acrylic acid or ester thereof

Examples

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Embodiment 1

[0140] Using propylene as a raw material, the crude acrylic acid obtained through the reaction step of catalytic gas phase oxidation reaction and the purification step is supplied to figure 1 In the shown distillation column 1, the distillation of acrylic acid is carried out continuously. Assuming that the tower top pressure of distillation tower 1 is 2.4kPaA, and the reflux ratio is 1.2, the acrylic acid vapor distilled from the tower top is supplied to figure 2 In the vertical shell and tube heat exchanger 20 of the shown structure.

[0141] A device having 225 SUS304 heat transfer tubes with an inner diameter of 1 inch was used as the vertical shell-and-tube heat exchanger 20 . The supply temperature of the cooling water is 15-19°C, and the temperature of the condensed high-purity acrylic acid is 30-33°C. About 5 to 10% by mass of the condensate is circulated to the receiving chamber 25 side. An acrylic acid solution of hydroquinone monomethyl ether was added to this ci...

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Abstract

The present invention relates to a method of producing (meth)acrylic acid or ester thereof which includes a step of generating distillation gas from process fluid that comprises (meth)acrylic acid orester thereof under reduced pressure effected by a reduced pressure device and generating a condensate from the distillation gas using a vertical multitubular heat exchanger, wherein the vertical multitubular heat exchanger has a spray nozzle that can spray droplets having a Sauter mean diameter of 570 to 1500 [mu]m and the average gas flow rate of the uncondensed distillation gas that flows intoa relay space from an extraction chamber is 15.0 m / s or less.

Description

technical field [0001] This invention relates to the manufacturing method of (meth)acrylic acid or its ester (it may be called a "(meth)acrylic" hereafter). In detail, the present invention relates to a method for producing (meth)acrylic acid, which comprises converting a treatment liquid containing (meth)acrylic acid into a distilled gas under reduced pressure using a decompression device, making the distilled gas The process of making condensate using a vertical shell-and-tube heat exchanger can prevent the formation and accumulation of polymers in the decompression system of the vertical shell-and-tube heat exchanger, and perform it stably for a long time (methyl) Continuous production of acrylics. [0002] In addition, in this specification, (meth)acrylic acid is a generic term for acrylic acid and methacrylic acid, and it may be either one or both. In addition, (meth)acrylic acid may be only any one of (meth)acrylic acid and (meth)acrylate, and may include both. Backg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/44B01D3/10B01D3/14B01D3/34B01D5/00C07C57/07F28F9/22
CPCC07C51/44B01D1/065B01D3/105C07C51/50C07C57/04B01D3/10B01D3/14B01D3/34B01D5/00F28F9/22
Inventor 中村将成小川宁之
Owner MITSUBISHI CHEM CORP
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