Process for producing (meth)acrolein or (meth)acrylic acid

A technology of acrolein and acrylic acid, which is applied in the direction of oxidative preparation of carboxylic acid, carboxylate preparation, organic chemical methods, etc., can solve uneconomical problems, and achieve the effect of ensuring continuous stable operation and superior economy

Inactive Publication Date: 2005-11-16
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering the required installation space and cost as well as its production capacity, it is very uneconomical to provide a preparatory workshop of substantially the same size, which remains non-operational except for the shutdown of the main workshop

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Acrylic acid is produced using a workshop for the production of acrylic acid, which sequentially includes an oxidation reaction step, a reaction gas cooling step, a low-boiling fraction separation step, a purification step, and a high-boiling fraction decomposition step, and has a production capacity of 100,000 tons per year, of which the oxidation reaction Steps - The reaction gas cooling step is provided in three series A, B and C, the low boiling fraction separation step and subsequent steps are provided in a single series. The production capacity of series A including the oxidation reaction step-reaction gas cooling step is 25000 tons per year (based on 25% of the total capacity); the production capacity of series B is 25000 tons per year (based on 25% of the total capacity); and series C The production capacity is 50000 tons / year (based on 50% of the total capacity). After 10 months from the start of operation of the plant, the pressure differential of the oxidatio...

Embodiment 2

[0062] Acrylic acid is produced using a workshop for the production of acrylic acid, which sequentially includes an oxidation reaction step, a reaction gas cooling step, a low-boiling fraction separation step, a purification step, and a high-boiling fraction decomposition step, and has a production capacity of 75,000 tons per year, of which the oxidation reaction Steps - The reaction gas cooling step is provided in two series A and B, the low boiling fraction separation step and subsequent steps are provided in a single series. The production capacity of series A including the oxidation reaction step-reaction gas cooling step is 25000 tons per year (based on about 33% of the total capacity); and the production capacity of series B is 50000 tons per year (based on about 67% of the total capacity). After 10 months from the start of operation of the plant, the pressure differential of the oxidation reactor used in series A increased and it became impossible to feed feed thereto. ...

Embodiment 3

[0064]The production of acrylic acid was carried out using the same equipment as in Example 2. After 10 months from the start of operation of the plant, the pressure differential of the oxidation reactor used in series B increased and it became impossible to feed feed thereto. Therefore, the operation of Series B was stopped. At this time, the operation of the oxidation reaction step-reaction gas cooling step in series A is continued. Because the operating capacity of the oxidation reaction step-reaction gas cooling step in series A is about 33%, while the operating capacity of the low-boiling point fraction separation step and subsequent steps is 50 to 100%, the part of the acrylic acid product obtained in the purification step introduces a low The boiling point fraction separation step to control the operating load of the low boiling point fraction separation step and subsequent steps to 50%. Continue to operate the plant under the above conditions. After complete repair ...

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Abstract

There is provided a process for producing (meth)acrolein or (meth)acrylic acid which is capable of avoiding stoppage of operation of a plant for production thereof as a whole due to failure of an oxidation reaction step in the process and ensuring a continuous stable operation of the plant, and is excellent in economical aspects. The process for producing (meth)acrolein or (meth)acrylic acid according to the present invention sequentially comprises an oxidation reaction step of subjecting a raw gas to gas-phase catalytic oxidation; a reaction gas cooling step of cooling the resultant reaction gas; a low-boiling fraction separation step of separating low-boiling components from the reaction product; a purification step of separating and removing high-boiling components from the reaction product; and a high-boiling fraction decomposition step of decomposing high-boiling components contained in a bottom liquid obtained from the purification step, said oxidation reaction step comprising a plurality of oxidation reaction steps which are disposed in parallel with each other and operated at the same time.

Description

technical field [0001] The present invention relates to a method for preparing (meth)acrolein or (meth)acrylic acid, more particularly, the present invention relates to a method for preparing (meth)acrolein or (meth)acrylic acid, which can avoid the The failure of the oxidation reaction step in the process completely stops the operation of the plant used for their production, and ensures continuous stable operation of the plant, and this method is superior in terms of economy. Background technique [0002] A conventional method for producing (meth)acrolein or (meth)acrylic acid includes an oxidation reaction step of subjecting a raw material gas such as propylene, propane and isobutylene to gas-phase catalytic oxidation using molecular oxygen; a reaction gas cooling step of cooling the reaction gas, the Reaction gas containing (meth)acrolein or (meth)acrylic acid thus prepared; low-boiling fraction separation step for separating low-boiling components from reaction products;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07B61/00C07C45/33C07C45/35C07C45/82C07C47/22C07C51/16C07C51/25C07C51/44C07C57/05
CPCC07C45/33C07C45/35C07C51/252C07C47/22C07C57/04
Inventor 矢田修平小川宁之高崎研二铃木芳郎
Owner MITSUBISHI CHEM CORP
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