Multi-section type heat insulation fixed bed reactor for PX production

Abstract

The invention discloses a multi-section type heat insulation fixed bed reactor for PX production. The multi-section type heat insulation fixed bed reactor comprises a basic component, a skirt support and a reactor body, wherein a first reaction region, a second reaction region, a third reaction region and a fourth reaction region are arranged in the reactor body in sequence from top to bottom; a fixed bed layer filled with a catalyst is arranged above each reaction region; a sieve pipe distributor is arranged below each reaction region; a first cold material inlet is formed in the side wall between the first reaction region and the second reaction region; a second cold material inlet is formed in the side wall between the second reaction region and the third reaction region; a heat exchange pipe outlet and a heat exchange pipe inlet are formed between the third reaction region and the fourth reaction region. The multi-section type heat insulation fixed bed reactor for PX production solves the problems that the existing fixed bed reactor is poor in heat dissipation effect, easily causes inactivation of catalysts and high loss of the catalysts and affects the reaction efficiency; meanwhile, by the adoption of material feeding from the side wall, heat in the reactor can be effectively used, and the heat supply cost is reduced.

Description

technical field [0001] The invention relates to a fixed-bed reactor, in particular to a multi-stage adiabatic fixed-bed reactor for PX production. Background technique [0002] Batch reactors and continuous reactors can be selected for the production of PX by using toluene methanol. In continuous reactors, there are mainly fluidized bed, bubbling fluidized bed and fixed bed. Although the fluidized bed can increase the contact between the solid phase and the gas phase area, heat transfer area and has the characteristics of fast mass transfer efficiency, but due to the violent movement of the catalyst particles, the serious back-mixing of the catalyst solid particles and the fluid results in a decrease in the concentration of the generated reactants, a decrease in the conversion rate, and the violent movement of the catalyst particles The catalyst is easily broken, which increases the loss of catalysis. At the same time, the catalyst will collide violently with the reactor wal...

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Problems solved by technology

[0003] In view of the above-mentioned problems in the prior art, the present invention proposes a kind of multistage adiabatic fixed-bed reactor that is used for PX production, solves the problem that the heat dissipation effect of the fixed-bed reactor of toluene methanol production PX is not good, and the reaction in the reactor emits Heat is wasted, heat is not effectively used, catalyst loss is large, reaction conversion rate is low and the concentration of reactants is low.

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