Reaction system and method for hydrofining crude terephthalic acid

Abstract

A reaction system for hydrofining crude terephthalic acid comprises a hydrogenation reactor, and a hydrogen micro-interface generator used for dispersing broken hydrogen is arranged in the hydrogenation reactor. The side wall of the hydrogenation reactor is communicated with a crude terephthalic acid pipeline and a hydrogen inlet pipeline, and the hydrogen inlet pipeline penetrates through the side wall of the hydrogenation reactor and is led into the hydrogen micro-interface generator. A product purified terephthalic acid obtained after reaction in the hydrogenation reactor sequentially enters a crystallization tower, a centrifugal separator and a dryer, and finally solid purified terephthalic acid is formed and enters a collection tank. According to the reaction system, the mass transfer rate and the macroscopic hydrogenation rate of the gas phase to the reaction liquid are greatly improved, so that the original reaction pressure, reaction temperature and catalyst consumption can be reduced, and the reaction efficiency is improved.

Description

technical field [0001] The invention relates to the field of refining crude terephthalic acid, in particular to a reaction system and method for hydrogenation and refining of crude terephthalic acid. Background technique [0002] Purified terephthalic acid production process, as the mainstream terephthalic acid (PTA) production process, usually includes an oxidation process and a hydrotreating process. The production process is as follows: the crude terephthalic acid ( CTA) is transported to the hydrogenation reactor through the raw material preparation unit, and the compressed hydrogen gas delivered to the hydrogenation reactor after being distributed through the distribution main pipe is fully contacted in the space above the liquid layer in the hydrogenation reactor, and the reaction liquid is redistributed after reaching the dissolution equilibrium. Flow through the reaction liquid layer and the catalyst bed, and hydrogenation reaction occurs in the catalyst bed, the cat...

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Problems solved by technology

[0005] (1) Small gas-liquid interface area and low mass transfer rate

Moreover, the distribution of hydrogen in the solution is uneven, the hydrogenation effect is poor, and the catalyst loss is large

[0006] (2) The reaction pressure of the trickle bed hydrogenation process is relatively high (about 8MPa), the investment cost and operating cost of the device are high, and the safety is reduced

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