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Method for inhibiting side reaction in gas-liquid oxidation column reactor

A liquid-phase reaction and oxidation tower technology, which is applied in chemical methods, chemical instruments and methods, and organic chemistry for reacting liquids and gaseous media to achieve uniform distribution, reduction of reaction by-products, and high conversion rates.

Inactive Publication Date: 2014-11-19
李金金
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to overcome the problem that the gas-liquid phase reaction occurs without uniform mixing of the components of the liquid phase reaction material, the invention provides a method for suppressing side reactions in the gas-liquid phase oxidation tower reactor, including a gas-liquid phase oxidation tower and a mixer, which is characterized in that several mixers are added to the gas-liquid phase oxidation tower feed line, and each component of the liquid phase reaction material is uniformly mixed through the mixer before entering the oxidation tower, and then passed through the same liquid phase The feed pipe enters the oxidation tower to participate in the gas-liquid phase reaction; the gas phase reaction material enters the oxidation tower through a gas phase feed pipe to participate in the gas-liquid phase reaction

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  • Method for inhibiting side reaction in gas-liquid oxidation column reactor
  • Method for inhibiting side reaction in gas-liquid oxidation column reactor

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Effect test

Embodiment 1

[0014] Such as figure 2 Shown, a kind of method of suppressing side reaction in the gas-liquid phase oxidation tower reactor of the present invention is as follows: adopt 3 static mixers (static mixer A6, static mixer B7, static mixer C8) and add in liquid phase By-products (crude benzaldehyde 3, crude benzyl benzoate 4). The main reactant, toluene 1, first enters the static mixer A6 together with the cobalt naphthenate catalyst 2 for mixing, and after mixing evenly, the material enters the static mixer B7 together with the crude benzaldehyde 3 for mixing, and after mixing evenly, the material is then mixed with crude benzoic acid The benzyl ester 4 enters the static mixer C8 for mixing, and after mixing evenly, it directly enters the oxidation tower to participate in the gas-liquid phase reaction; the air 5 enters the oxidation tower alone through a pipeline to participate in the gas-liquid phase reaction. The components of the liquid phase material are uniformly mixed befo...

Embodiment 2

[0016] Such as figure 2 Shown, a kind of method of suppressing side reaction in the gas-liquid phase oxidation tower reactor of the present invention is as follows: adopt 2 static mixers (static mixer B7 and static mixer C8), and add byproduct (crude) in liquid phase Benzaldehyde 3, crude benzyl benzoate 4). The main reactant toluene 1 first enters the static mixer B7 together with the cobalt naphthenate catalyst 2 and the crude benzaldehyde 3 for mixing, and after mixing evenly, the material enters the static mixer C8 for mixing together with the crude benzyl benzoate 4, and mixes well Then directly enter the oxidation tower to participate in the gas-liquid phase reaction; air 5 enters the oxidation tower alone through a pipeline to participate in the gas-liquid phase reaction; the components of the liquid phase material are uniformly mixed before entering the oxidation tower. The addition amount of by-products crude benzaldehyde 3 and crude benzyl benzoate 4 is determined ...

Embodiment 3

[0018] Such as figure 2 Shown, a kind of method of suppressing side reaction in the gas-liquid phase oxidation tower reactor of the present invention is as follows: adopt 1 static mixer (static mixer C8), and add byproduct (crude benzaldehyde 3, crude Benzyl Benzoate 4). The main reactant, toluene 1, enters the static mixer C8 together with the cobalt naphthenate catalyst 2, crude benzaldehyde 3, and crude benzyl benzoate 4 to mix, and after mixing evenly, directly enters the oxidation tower to participate in the gas-liquid phase reaction; 5 alone through a pipeline into the oxidation tower to participate in the gas-liquid phase reaction. The components of the liquid phase material are uniformly mixed before entering the oxidation tower. The addition amount of by-products crude benzaldehyde 3 and crude benzyl benzoate 4 is determined by each manufacturer according to their actual production. Since the components of the liquid-phase reaction material are uniformly mixed bef...

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Abstract

The invention provides a method for inhibiting side reaction in a gas-liquid oxidation column reactor which includes a gas-liquid oxidation column and mixers. A plurality of mixers is added to a feeding pipeline of the gas-liquid oxidation column. The components in a liquid-phase reaction material are uniformly mixed through the mixers before being fed into the oxidation column and then are fed into the oxidation column through a liquid-phase material feeding pipe for being subjected to a gas-liquid reaction. A gas-phase reaction material is fed into the oxidation column through a gas-phase material-feeding pipe for being subjected to the gas-liquid reaction. Because the components in the liquid-phase reaction material are uniformly mixed, reaction products are distributed more uniformly in a liquid phase. The invention has following advantages: (1) a selectivity of a main reaction is high; (2) a reaction rate of the main reaction is high; (3) a conversion per pass of the main reaction is high; and (4) sub reaction products are few. By means of the feeding manner in the invention, the sub reaction products are greatly reduced. In a benzoic acid production enterprise, purity of benzoic acid can be increased from 99.0% (first class product) to 99.5% (premium class product).

Description

technical field [0001] The invention belongs to the technical field of preparing organic compounds by a gas-liquid phase oxidation method, and in particular relates to a method for suppressing side reactions in a gas-liquid phase oxidation tower reactor. The gas-liquid phase oxidation method here includes the reaction of adding gas-phase oxygen elements to the liquid-phase organic matter to synthesize organic oxides and the reaction of adding gas-phase halogen elements to liquid-phase organic matter to synthesize organic halides. Background technique [0002] In the past ten years, along with the upgrading of industrialization technology in the organic chemical industry, small batch chemical equipment can no longer meet the needs of enterprises for low energy consumption and low cost, and new continuous chemical equipment has developed rapidly. In recent years, in the technical field of preparing organic compounds by gas-liquid phase oxidation, gas-liquid phase oxidation tow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J10/00C07C63/06C07C51/265
Inventor 李金金
Owner 李金金