Synthesis system and method for preparing adiponitrile by ammoniation of adipic acid

Abstract

The invention provides a synthesis system and method for preparing adiponitrile by ammoniation of adipic acid. The synthesis system comprises an ammoniation reactor and a reactive distillation tower which are connected in sequence, wherein the reactive distillation tower comprises a distillation section and a deep dehydration reaction section; and the ammoniation reactor is provided with a raw material inlet and a reaction feed liquid outlet, the raw material inlet comprises an ammonia gas inlet, a micro-interface generation system is arranged in the ammoniation reactor, and the micro-interface generation system is used for dispersing ammonia gas and / or reaction feed liquid. According to the synthesis system provided by the invention, by uniformly integrating rectification separation and synthesis reaction, the reaction route is optimized, the reaction separation efficiency is improved, the product quality and yield are further improved, and in addition, the effects of saving the equipment cost and saving the occupied area of the equipment are also achieved.

Description

technical field [0001] The invention relates to the field of adiponitrile preparation, in particular to a synthesis system and method for preparing adiponitrile by ammoniating adipic acid. Background technique [0002] Adiponitrile is traditionally used as an intermediate in the production of nylon 66 resin. In recent years, with the development of technology, its application field has been further expanded. It can be processed and synthesized into caprolactam, which can then be used to produce nylon 6 resin. Plasticizers, antioxidants, stabilizers, sterilizers, extractants, bleaching agents, vulcanizing agents, etc., are widely used in coatings, medicines, spices, fuels, electroplating, washing, textile solvents, analytical chemical determinations, etc. [0003] The synthesis process routes of adiponitrile mainly include acrylonitrile (AN) electrolytic dimerization method, butadiene (BD) method, adipic acid (ADA) catalytic amination method and caprolactam method. Among the...

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Problems solved by technology

[0005] In the prior art, in the process of preparing adiponitrile by adipic acid catalytic ammoniation, there are problems such as too long reaction route and low efficiency of the reaction separation system, and the generated adiponitrile cannot be taken out in time to make the dehydration reaction reach an equilibrium state , resulting in long reaction residence time and more by-products, affecting the quality of the product and reducing the yield of the product

[0006] In addition, the phase boundary area in the reaction process has a greater influence on the volumetric mass transfer coefficient, but the reaction devices such as tank reactors, tubular reactors, and tower reactors in the prior art generally have low mass transfer efficiency. Therefore, it is difficult to make a breakthrough in the reaction efficiency, which affects the reaction efficiency in the reaction process.

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