Method for producing unsaturated aldehyde and unsaturated carboxylic acid

A manufacturing method and unsaturated technology, which are applied in the preparation of carboxylate, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of the reduction of the reaction rate of raw materials and the reduction of catalyst activity, and achieve the effect of long-term use.

Active Publication Date: 2009-05-20
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The catalyst used in this gas-phase catalytic oxidation reaction can be used for a long time, but usually the activity of the catalyst decreases with time, and the reaction rate of the raw material decreases

Method used

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  • Method for producing unsaturated aldehyde and unsaturated carboxylic acid
  • Method for producing unsaturated aldehyde and unsaturated carboxylic acid
  • Method for producing unsaturated aldehyde and unsaturated carboxylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] (1st response)

[0095] 2000 g of the catalyst obtained in Reference Example was filled in the reaction tube used in Reference Example. Next, the temperature of the heating bath was set at 320°C, and a reaction gas composed of 5 vol% of isobutylene (reaction raw material), 9 vol% of oxygen, 10 vol% of water vapor, and 76 vol% of nitrogen was passed through at a catalytic time of 4.5 seconds. Gas-phase catalytic oxidation of isobutene is carried out under the conditions of the catalyst layer. As a result of analyzing the initial reaction products, the reaction rate of isobutylene was 95.7%, the selectivity of methacrolein was 87.9%, and the selectivity of methacrylic acid was 5.4%. The temperature of the heat bath at this stage was 320° C., the average reaction pressure was 100 kPa, and the molar ratio of molecular oxygen in the reaction gas / raw material was 2.0 (initial reaction conditions).

[0096] (second response)

[0097] Next to the first reaction, control is p...

Embodiment 2

[0103] (1st response)

[0104] The first reaction was carried out in the same manner as in Example 1.

[0105] (second response)

[0106] In the 1st reaction, then, as figure 2 As shown, the second reaction was carried out in the same manner as in Example 1 except that the temperature of the heating bath and the average reaction pressure were changed. The cycle of continuous operation is 7520 hours. Analysis of the reaction product at this stage revealed that the reaction rate of isobutylene was 95.6%, the selectivity of methacrolein was 87.9%, and the selectivity of methacrylic acid was 5.4%. The temperature of the hot bath at this stage was 335° C., the average reaction pressure was 110 kPa, and the molar ratio of molecular oxygen / raw material in the reaction gas was 2.0 (reaction condition 2).

[0107] (3rd reaction)

[0108] After the second reaction, the third reaction was carried out in the same manner as in Example 1. Analysis of the initial reaction product at t...

Embodiment 3

[0112] (1st response)

[0113] The first reaction was carried out in the same manner as in Example 1.

[0114] (second response)

[0115] Then the first reaction, such as image 3 As shown, the second reaction was carried out in the same manner as in Example 1, except that the temperature of the heating bath and the molar ratio of molecular oxygen in the reaction gas / raw material were changed. The cycle of continuous operation is 8000 hours. Analysis of the reaction products at this stage revealed that the reaction rate of isobutylene was 95.7%, the selectivity of methacrolein was 87.9%, and the selectivity of methacrylic acid was 5.4%. The temperature of the hot bath at this stage was 335° C., the average reaction pressure was 100 kPa, and the molar ratio of molecular oxygen in the reaction gas / raw material was 2.3 (reaction condition 3).

[0116] (3rd reaction)

[0117] After the second reaction, the third reaction was carried out in the same manner as in Example 1. An...

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PUM

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Abstract

Disclosed is a method wherein propylene, isobutylene or a tertiary butanol is catalytically oxidized with molecular oxygen in a vapor phase for producing corresponding unsaturated aldehyde and unsaturated carboxylic acid. This method enables to use a catalyst for a long time. Specifically disclosed is a method wherein propylene, isobutylene or a tertiary butanol as a raw material is catalytically oxidized with molecular oxygen in a vapor phase in the presence of a catalyst, which is composed of a complex oxide essentially containing molybdenum, bismuth and iron, for producing corresponding unsaturated aldehyde and unsaturated carboxylic acid. In this method, the reaction pressure and/or the molar ratio between oxygen and the raw material are controlled so that the reaction rate of the raw material is kept constant at a certain level within a temperature range of not less than (TA - 15) DEG C and not more than TA DEG C with TA DEG C being the boundary temperature of the activation energy of the catalyst.

Description

technical field [0001] The present invention relates to the production method of unsaturated aldehyde and unsaturated carboxylic acid, relate to in the presence of catalyst and use molecular state oxygen to carry out gas-phase catalytic oxidation of propylene, isobutene or tert-butanol to produce respectively corresponding unsaturated aldehyde and unsaturated carboxylic acid Method for Unsaturated Carboxylic Acids. Background technique [0002] The method of producing the corresponding unsaturated aldehyde and unsaturated carboxylic acid by gas-phase catalytic oxidation of propylene, isobutene or t-butanol in the presence of a catalyst is well known, and this method is also used industrially. As the catalyst, for example, a catalyst composed of a composite oxide containing molybdenum, bismuth, and iron as essential components is used (Patent Documents 1 to 6). In this case, the reaction is carried out at a temperature of 300 to 400° C. using a catalyst in the form of a fixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/35B01J23/88C07C47/22C07C51/235C07C57/055
CPCB01J37/0009C07C51/235C07C45/37B01J23/002C07C45/35C07C51/252B01J37/0045B01J2523/00C07C47/22C07C57/04B01J2523/15B01J2523/27B01J2523/53B01J2523/54B01J2523/68B01J2523/842B01J2523/845B01J23/88
Inventor 近藤正英河藤诚一黑田彻
Owner MITSUBISHI CHEM CORP
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