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An oxidation reaction device and its application in the oxidation reaction of aldehyde compounds

An oxidation reaction and reaction device technology, applied in the preparation of organic compounds, chemical methods for reacting liquid and gas media, chemical/physical processes, etc., can solve the problems of inability to install heat transfer devices, safety risks, and easy accumulation of static electricity etc. to save compression power and cost, avoid combustion or explosion, and speed up the reaction process

Active Publication Date: 2022-04-19
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal structure of the device is complicated, and it is impossible to install a sufficient or effective heat transfer device in the reaction device, and it is also impossible to completely prevent the nitrogen in the gas phase space from being involved below the liquid surface, and the device uses mechanical stirring for vapor-liquid mixing, stirring The paddle turning equipment itself is prone to build up static electricity and is a potential source of ignition, posing a safety risk

Method used

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  • An oxidation reaction device and its application in the oxidation reaction of aldehyde compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 Oxygen-enriched air oxidation of propionaldehyde

[0035] Use reaction apparatus A to carry out oxidation reaction, propionaldehyde feed rate 1g / min, oxygen-enriched air (O 2 : 70mol%, N 2 : 30mol%) flow rate: 0.2755NL / min (oxygen-aldehyde molar ratio 0.5), control the gas side pressure of the oxygen feed part to be 1.5bar, the reaction temperature is 30°C, and the reaction pressure is 1bar. Test after the reaction: the conversion rate of propionaldehyde is 99.0%, and the selectivity of propionic acid is 98.3%.

Embodiment 2

[0036] Embodiment 2 pure oxygen oxidation of n-hexanal

[0037] Use reaction device B to carry out oxidation reaction, n-hexanal feed rate 3g / min, oxygen flow rate: 0.3488NL / min (oxygen aldehyde molar ratio 0.52), control the gas side pressure of oxygen feed part to be 1bar, reaction temperature 50 ℃, reaction pressure 0.5 bar. Test after the reaction: the conversion rate of n-hexanal was 98.9%, and the selectivity of n-hexanoic acid was 98.5%.

Embodiment 3

[0038] Example 3 Oxidation of 3,5,5-trimethylhexanal with pure oxygen

[0039] Use reaction device A to carry out oxidation reaction, 3,5,5-trimethylhexanal feed rate 4.21g / min, oxygen flow rate: 0.3212NL / min (oxygen aldehyde molar ratio 0.505), control the gas side pressure of oxygen feed part The reaction temperature is 0.5 bar, the reaction temperature is 70°C, and the reaction pressure is 0 bar. Tests after the reaction: the conversion rate of 3,5,5-trimethylhexanal was 99.1%, and the selectivity of 3,5,5-trimethylhexanoic acid was 98.7%.

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Abstract

The invention provides an oxidation reaction device and its application in the oxidation reaction of aldehyde compounds. The oxidation reaction device includes a shell-and-tube reactor and a gas-liquid separator, and the gas-liquid separator communicates with the top of the shell-and-tube reactor through a pipeline. The shell-and-tube reactor is sequentially divided into raw material liquid feeding part, oxygen feeding part, reaction part and nitrogen feeding part from bottom to top. The cavities of each part are provided with reaction tubes and the cavities are separated by sealing plates. The present invention fully proceeds the oxidation reaction and reduces the risk of combustion or explosion through various means. In addition, the present invention can use pure oxygen or oxygen-enriched air as the raw material for the oxidation reaction, and the reaction speed is significantly higher than that of traditional air oxidation, which can ease the reaction. Conditions, reduce reaction temperature and pressure, improve selectivity; and the reduction of gas volume can save the compression power and cost of compressed air, and can effectively reduce the loss of materials caused by tail gas entrainment and other reasons.

Description

technical field [0001] The invention relates to a reaction device, in particular to an oxidation reaction device and its application in the oxidation reaction of aldehyde compounds. Background technique [0002] Gas-liquid two-phase oxidation reaction is a commonly used chemical production process. For example, hydrocarbons, alcohols, aldehydes and other compounds are oxidized to produce aldehydes, ketones, carboxylic acids and other products. The oxidant is usually air, oxygen-enriched air or pure Oxygen, the use of oxygen-enriched air or pure oxygen oxidation has many advantages such as accelerating the reaction rate, easing the reaction conditions, reducing the amount of waste gas, reducing material loss, and saving gas compression costs. However, compared with air oxidation, when the oxygen concentration increases, the material occurs The possibility of combustion or explosion will be greatly increased, which will bring hidden dangers to safe production. Therefore, ensur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/235C07C53/122C07C53/126B01J10/00
CPCC07C51/235B01J10/00B01J2219/00076C07C53/122C07C53/126
Inventor 刘振峰赵一鸣袁帅董龙跃丛鑫董科刘超黄少峰吕艳红任亚鹏赵聪刘喆许振成崔乾王鹏余炎冰王加琦何金同李洪昌邓萌于冠群路赟
Owner WANHUA CHEM GRP CO LTD