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Oxidizing reactor in bubbling tower of internal circulation for producing aromatic acid

An oxidation reactor and internal circulation technology, applied in chemical instruments and methods, organic chemistry, carboxylate preparation, etc., can solve problems affecting reaction efficiency, complex internal structure of reactor, low oxygen concentration, etc., and achieve good application prospects , Improve the axial oxygen concentration gradient and promote the effect of material circulation

Active Publication Date: 2007-12-26
SINOPEC YIZHENG CHEM FIBER
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Problems solved by technology

However, the oxygen concentration in the upper part of the bubble column with a large aspect ratio is relatively low, which affects the reaction efficiency
[0007] Patent CN1293184 starts from the perspective of changing the flow form of the material in the reactor, so that the reaction is carried out in a tower reactor with a flow form close to plug flow, and the speed and conversion rate of p-xylene oxidation to terephthalic acid are improved. The internal structure of the reactor is relatively complex

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  • Oxidizing reactor in bubbling tower of internal circulation for producing aromatic acid
  • Oxidizing reactor in bubbling tower of internal circulation for producing aromatic acid

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Embodiment Construction

[0019] In a conventional bubble column oxidation reactor, after the gas enters the reactor through the gas distributor at the bottom of the reactor, the bubbles continue to rise, coalesce, and grow up, forming large-diameter bubbles in the upper and middle parts of the reactor. Higher apparent gas holdup, but the gas-liquid interface area and gas-liquid mass transfer capacity are not as good as the middle and lower parts of the bubble column reactor. On the other hand, inside the bubble column without internal components, the liquid phase flow is chaotic, and there is a concentration difference in the height direction of the column, and the inlet and outlet of the liquid and solid phase materials are generally set in the lower section of the column, resulting in a lower reaction efficiency in the upper part of the bubble column. For bubble columns with a large aspect ratio, the above problems are more prominent.

[0020] The present invention adopts the method of rationally ar...

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Abstract

This invention relates to an inner circulating bubbling column oxidation reactor for producing aromatic acids. The column is composed of three sections, i.e., a gas-liquid separation section at the upper part, a multi-stage bubbling section at the middle part and a solid-liquid suspension section at the lower part. The multi-stage bubbling section is equipped with 1-5 stage gas distributor and 1-5 stage inner circulating draft-tube. The reactor is free of any moving part inside, and can promote raw material circulation in a certain region in the column, effectively eliminate inadequate mixing zone, and obviously decrease raw material concentration and temperature gradient by synergistic effect of inner circulating draft-tube and gas distributor.

Description

technical field [0001] The invention relates to a technical method and a reaction device for preparing aromatic acids by liquid-phase oxidation of aromatic hydrocarbons, in particular to an internal circulation bubble tower oxidation reactor for producing aromatic acids, which belongs to the technical field of chemical equipment. Background technique [0002] The bubble column reactor is an important device for gas-liquid two-phase or gas-liquid-solid three-phase mass, energy and chemical reactions, and has the characteristics of simple structure and stable operation. The technical method for the preparation of aromatic acids by the liquid-phase oxidation of aromatic hydrocarbons can be industrially used in bubble column reactors, especially for the preparation of terephthalic acid by liquid-phase catalytic oxidation of p-xylene. In recent years, there has been a trend of increasing scale. [0003] Most commercial-scale terephthalic acid preparation processes use acetic acid...

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Application Information

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IPC IPC(8): C07C63/26C07C51/265B01J19/00
Inventor 冯连芳张军顾雪萍仲军实王嘉骏李良超
Owner SINOPEC YIZHENG CHEM FIBER
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