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Process for producing (meth) acrylic acids

一种甲基、制造设备的技术，应用在丙烯酸类的制造领域，能够解决妨碍有用物高回收率、压差上升、气液接触状态恶化等问题

Inactive Publication Date: 2005-01-12
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, these solids will adhere, accumulate, and accumulate on the trays inside the distillation column or in the gaps of the packing, causing pressure differences to rise, deteriorating the gas-liquid contact state, and causing clogging, etc.
As a result, there is a problem that it prevents obtaining a high recovery rate of useful substances, or prevents stable continuous operation
[0038] Therefore, the liquid level meter cannot be used for continuous and accurate measurement, and the equipment cannot be operated stably for a long time.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach b

[0177] In this embodiment b, when implementing the decomposition reaction of (meth)acrylic-type Mikkel adducts, it is found that the tower bottom liquid is not continuously drawn out from the bottom of the reactor, but sent out by pulsation, that is, intermittently drawn out, which can be achieved without clogging for a long time. implemented to achieve the purpose. The reason why clogging is prevented well is not clear, but the present inventors infer from the experimental facts that clogging in the pipe under normal flow makes the flow of fluid more turbulent due to intermittent flow, although the flow of fluid has nothing to do with temporary stop, but the The disorder effect is due to extremely effective suppression of clogging.

[0178] and are the same as in the case of embodiment a.

[0179]

[0180] Figure 6 It is an example of the production pipeline of the thermal decomposition reaction of the present invention, except for C: heat exchanger for heating, F: in...

Embodiment approach C

[0186] Embodiment C solves the problems of attachment, accumulation and accumulation of solids by using overflow plate discs and ring-shaped trays as the trays of the distillation tower. That is, the disc and ring-shaped trays are trays in which disc-shaped trays and ring-shaped trays are alternately arranged at appropriate intervals, as will be shown later. Figure 7 , Figure 8 As shown, because the structure is extremely simple and the opening is very large, it is difficult for solids to settle and accumulate, so the problems of adhesion, accumulation and accumulation of solids can be solved.

[0187] Therefore, the decomposition of by-products and the recovery of useful substances during (meth)acrylic acid production can be stably performed by using a distillation column having discs and ring-type trays, which are extremely structurally It is simple, and has an advantage that construction costs such as manufacturing costs and installation costs of the distillation tower a...

Embodiment approach d

[0212]Embodiment d is an invention in which oxygen or an oxygen-containing gas is directly supplied to the distillate containing the decomposition product produced by the decomposition reaction of the above-mentioned by-product, and uses the action of this oxygen to suppress the polymerization of the easily polymerizable compound in the decomposition product. method. As a result of various studies, it has been found that the addition of such oxygen or oxygen-containing gas sufficiently suppresses the polymerization of the easily polymerizable compound in the decomposition product. This is presumably because the added oxygen increases the polymerization inhibitor effect of the polymerization inhibitor normally contained in the decomposition reaction raw material.

[0213] The (meth)acrylate in embodiment d is not particularly limited, and the same examples as those described in embodiment c can be cited. In addition, the same contents as those described in the embodiment c can...

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Abstract

A process for producing (meth)acrylic acid or (meth)acrylic acid esters, which comprises a reaction step comprising vapor phase catalytic oxidation of propylene, propane or isobutylene and, if necessary, a reaction step comprising an esterification step, characterized in that at the time when a high boiling mixture (hereinafter referred to as a high boiling material) containing a Michael addition product, is decomposed in a decomposition reactor to recover (meth)acrylic acids, while forcibly imparting a liquid flow in the circumferential direction to a liquid reaction residue in the decomposition reactor, the liquid reaction residue is discharged. In a process for recovering a valuable substance by thermally decomposing the high boiling material containing the Michael addition product of (meth)acrylic acids, it is possible to transfer the decomposition residue from the decomposition reactor to the storage tank without clogging, whereby a long-term continuous operation is possible.

Description

[0001] This application is a divisional application of the international application (PCT / JP02 / 12709) with a filing date of December 4, 2002, a national application number of 02824318.8, and an international application entitled "Method for Manufacturing (Meth) Acrylics". technical field [0002] The present invention relates to a method for producing (meth)acrylic acid, which is a by-product of (meth)acrylic acid or (meth)acrylic acid ester Mikel adduct Decompose by-products such as (meth)acrylic acid, (meth)acrylic acid esters and alcohols, and recover useful compounds such as (meth)acrylic acid, (meth)acrylates, and alcohols to reduce the amount of industrial waste, and because of the high recovery rate, it is beneficial to industrial manufacturing (meth) Acrylic method. [0003] In addition, in this specification, (meth)acrylic acid is a generic term for acrylic acid and methacrylic acid, and it may be either one type or both types. The so-called (meth)acrylic acid is a g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/24B01D3/32B01J8/22B01J14/00B01J19/00B01J19/18C07C51/25
CPCB01J8/228B01J14/00B01D3/322B01D3/225B01J19/0066B01J2219/00094B01J2208/0084B01D3/14B01D3/24B01J2208/00283B01J2219/00774B01J2219/00252B01J2219/00006B01J19/18B01J2219/00247C07C51/252B01J19/006B01J2208/003C07C57/04
Inventor 矢田修平小川宁之铃木芳郎高桥洁高崎研二
Owner MITSUBISHI RAYON CO LTD
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