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...

Examples

Embodiment

[0046] refer to figure 1 As shown, the crude terephthalic acid hydrogenation and refining reaction system provided by the embodiment of the present invention mainly includes a crude terephthalic acid raw material tank 11, a hydrogen gas inlet pipeline 12, a hydrogenation reactor 20, a crystallization tower 30, Centrifugal separator 40 , dryer 50 and collection tank 60 . The crude terephthalic acid raw material tank 11 is connected to the hydrogenation reactor 20 through a crude terephthalic acid pipeline 13 so that the crude terephthalic acid enters the hydrogenation reactor 20 . The hydrogenation reactor 20 is internally provided with a hydrogen micro-interface generator 21, a gas distribution pipeline 22 and a palladium-carbon catalyst bed 23, and the hydrogen gas inlet pipeline 12 passes through the side wall of the hydrogenation reactor 20 and the hydrogen micro-interface generator 21 connected.

[0047] The hydrogen micro-interface generator 21 is arranged at the bottom...

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...

Examples

Embodiment

[0046] refer to figure 1 As shown, the crude terephthalic acid hydrogenation and refining reaction system provided by the embodiment of the present invention mainly includes a crude terephthalic acid raw material tank 11, a hydrogen gas inlet pipeline 12, a hydrogenation reactor 20, a crystallization tower 30, Centrifugal separator 40 , dryer 50 and collection tank 60 . The crude terephthalic acid raw material tank 11 is connected to the hydrogenation reactor 20 through a crude terephthalic acid pipeline 13 so that the crude terephthalic acid enters the hydrogenation reactor 20 . The hydrogenation reactor 20 is internally provided with a hydrogen micro-interface generator 21, a gas distribution pipeline 22 and a palladium-carbon catalyst bed 23, and the hydrogen gas inlet pipeline 12 passes through the side wall of the hydrogenation reactor 20 and the hydrogen micro-interface generator 21 connected.

[0047] The hydrogen micro-interface generator 21 is arranged at the bottom...

Images