Fixed bed production device for continuously producing 1, 4-cyclohexanedicarboxylic acid and use method

Abstract

The invention relates to a fixed bed production device for continuously producing 1, 4-cyclohexanedicarboxylic acid, which comprises an oxidation reactor, a heat exchange dissolver, a refining reactor, a crystallizer group consisting of a plurality of crystallizers, a TPA solution storage tank and a fixed bed hydrogenation reactor, wherein the oxidation reactor, the heat exchange dissolver, the refining reactor and the crystallizer group are connected in sequence; wherein the refining reactor and crystallizers in the crystallizer group are connected with shunting pipelines, side lines of the pipelines are connected with a feed port of the TPA solution storage tank, and the fixed bed hydrogenation reactor is connected with a discharge port of the TPA solution storage tank. By transforming TPA production equipment, continuous supply of TPA aqueous solutions with different concentrations, especially high-concentration TPA aqueous solutions in the CHDA production process is realized; the flow setting and control system is simple, the yield of CHDA in unit time is high, and the energy consumption is low; the influence on the TPA production process and the productivity is very small, and synchronous production of TPA and CHDA is realized; the conversion rate of TPA is gt; the content is 99.5%.

Description

technical field [0001] The invention relates to an industrial production device and a use method, in particular to a fixed-bed production device and a use method for continuous production of 1,4-cyclohexanedicarboxylic acid. Background technique [0002] The molecular formula of 1,4-cyclohexanedicarboxylic acid (1,4-cyclohexanedicarboxylic acid, CHDA) is C8H12O4, the molecular weight is 172.18, and the cas registration number is 1076-97-7 (cis and trans mixed), 619-82-7 (trans) , 619-81-8 (cis), mainly used in coatings, polyester modification and medicine and other fields. [0003] The preparation process of CHDA includes direct hydrogenation of terephthalate and TPA aqueous solution. [0004] TPA direct hydrogenation methods include: US47544064 introduced the technology of preparing CHDA by catalytic hydrogenation in stainless steel batch reactors, wherein the concentration of TPA in ethyl acetate was 1:3 to 1:5; US6291706 introduced Eastman’s use of TPA in stainless steel...

AI Technical Summary

Problems solved by technology

[0018] The above TPA direct hydrogenation technology does not solve the problem of how to realize the continuous feeding of hydrogenation raw materials with different concentrations of TPA aqueous solutions, especially the high temperature and high pressure problems faced by high-concentration TPA aqueous solutions. In the prior art, the production of CHDA is prepared by using TPA The process is a single reaction. After the solid TPA raw material is heated and pressurized to 450 kg and above 250 ° C, it is dissolved into a raw material liquid and then participates in the reaction. After the reaction is completed, the temperature and pressure of the reactor are lowered.

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