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Method and apparatus for producing PTA via deep oxidation by using oxygen-deficient gas

A technology of deep oxidation and oxygen-poor gas, which is applied in the fields of chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of oxidative combustion loss of solvent acetic acid, high investment, and large energy consumption, etc., to avoid oxidation of acetic acid Effects of burning, reducing investment and saving energy

Active Publication Date: 2013-03-27
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

At present, the technical defects of the deep oxidation (or aging) method in the world are high investment, high energy consumption, and a lot of oxidation and combustion losses of the solvent acetic acid.

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  • Method and apparatus for producing PTA via deep oxidation by using oxygen-deficient gas
  • Method and apparatus for producing PTA via deep oxidation by using oxygen-deficient gas

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Embodiment Construction

[0021] The invention provides a method for producing PTA by deep oxidation using oxygen-poor gas. The method includes two steps: step (1) is the oxidation stage, adding p-xylene (PX), acetic acid solvent and catalyst to the oxidation reaction device Usually, the oxidation gas introduced in step (1) is fresh air, which oxidizes p-xylene (PX) to terephthalic acid (TA), and at the same time generates an intermediate product: p-toluic acid (PT acid), p-carboxy basic formaldehyde (4-CBA), p-tolualdehyde (TALD), the oxidation tail gas is waiting for subsequent treatment; step (2) is the deep oxidation stage, and the mixture produced by the oxidation stage enters the deep oxidation reaction device, using Oxygen-depleted gas deeply oxidizes the mixture. The oxygen-depleted gas can be a mixture of purified exhaust gas and fresh air produced in step (1). The ratio of the two gases is about 4:1-10:1, such as 4:1 , 6:1, 8:1 or 10:1. The oxygen content in the mixed gas is preferably 4-10%...

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Abstract

The invention relates to a method and an apparatus for producing PTA via deep oxidation by using an oxygen-deficient gas. The method comprises the following steps of (1) oxidizing p-xylene in an acetic acid solvent by using an oxygen-containing gas to form oxidation slurry of p-xylene and intermediate products; and (2) performing deep oxidation on the oxidation slurry obtained from the step (1) by using the oxygen-deficient gas so as to obtain PTA. The apparatus comprises an oxidation reaction device, a deep oxidation reaction device and a tail gas purification treatment device. The material outlet of the oxidation reaction device is connected with the material inlet of the deep oxidation reaction device; the gas inlet of the deep oxidation reaction device is connected with the gas outlet of the tail gas purification treatment device through a tail gas delivery pipeline; and the gas inlet of the deep oxidation reaction device is also connected with a compressed air delivery pipeline. The deep oxidation is carried out by using the oxygen-deficient gas, so that requirements for oxygen concentration of a deep oxidation reaction can be met; oxidation combustion of acetic acid caused by too high oxygen content in the gas can be prevented; and gas volume fraction in the reaction slurry can be increased.

Description

technical field [0001] The invention relates to a process and a process device for generating terephthalic acid by catalytic oxidation of p-xylene in industrial production, and belongs to the field of terephthalic acid production. Background technique [0002] At present, there are two main production routes of polymeric terephthalic acid (PTA) in the world. One of the production techniques is the deep oxidation method, or aging reaction, that is, p-xylene (PX) is dissolved in the solvent acetic acid (HAC). The air oxidizes it to generate terephthalic acid (TA) and intermediate products. After oxidation, continue to pass air into the TA slurry containing the intermediate product to make it deeply oxidized, and the intermediate product p-toluic acid (PT acid) and p-carboxybenzaldehyde (4-CBA) are oxidized to form TA. The main reaction process is as follows: [0003] [0004] p-xylene p-tolualdehyde p-toluic acid p-carboxybenzaldehyde terephthalic acid [0005] The oxid...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C63/26C07C51/265
Inventor 玄昌伟许贤文姚瑞奎汪英枝李利军阚学成
Owner BC P INC CHINA NAT PETROLEUM CORP
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