Micro-interface reaction system and method for hydrofining crude terephthalic acid

Abstract

The invention discloses a micro-interface reaction system for hydrofining crude terephthalic acid, which is characterized by comprising a hydrogenation reactor, wherein a hydrogen micro-interface generator for dispersing and breaking hydrogen is arranged in the hydrogenation reactor; the hydrogenation reactor is provided with a bubbling tower type reactor in parallel, and the bubbling tower type reactor is connected with an external micro-interface unit; and products obtained after reaction of the hydrogenation reactor and the bubbling tower type reactor are connected in parallel and sequentially enter a crystallization tower, a centrifugal separator and a dryer, and finally solid refined terephthalic acid is formed and enters a collecting tank. According to the reaction system, the mass transfer rate of the gas phase to the reaction liquid and the macroscopic hydrogenation rate 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 micro-interface 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 catal...

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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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