Production method of tetrahydrofuran

Abstract

The invention discloses a production method of tetrahydrofuran, relates to the field of chemical engineering, and aims to solve the problems of high refining energy consumption and low dehydration efficiency during tetrahydrofuran production. The production method of tetrahydrofuran comprises the following steps: under the blocking of a dividing wall structure, feeding a raw material at least containing 1, 4-butanediol into a catalytic reaction section, and then carrying out a first dehydration cyclization reaction on 1, 4-butanediol in the catalytic reaction section by adopting a solid acid catalysis mode, a first gas-phase product and a first liquid-phase product at least comprising a first water phase containing tetrahydrofuran are obtained. Wherein the first water phase enters the first stripping section through the dividing wall structure, and a second gas phase product is separated from the first water phase by utilizing the first stripping section. And finally, feeding the first gas-phase product and the second gas-phase product into a separation device from a gas-phase product outlet of the dividing wall type reactor, and separating tetrahydrofuran from the first gas-phase product and the second gas-phase product by using the separation device. The tetrahydrofuran production method provided by the invention is used for producing tetrahydrofuran.

Description

technical field [0001] The invention relates to the chemical field, in particular to a production method of tetrahydrofuran. Background technique [0002] Tetrahydrofuran is an important organic chemical raw material with high polarity, low boiling point, low toxicity and other excellent properties, so it is called a universal solvent. Among them, 1,4-butanediol dehydration cyclization is the most important method for preparing tetrahydrofuran. [0003] At present, the commonly used catalysts for the preparation of tetrahydrofuran by dehydration of 1,4-butanediol are inorganic acids, strongly acidic cation exchange resins or solid acids. Among them, the use of inorganic acid as a catalyst has the risk of corroding equipment, and has many side reactions and complicated processes; using solid acid as a catalyst has a high reaction temperature, and the polymerization of the product tetrahydrofuran at high temperature and high concentration will lead to an increase in the amoun...

AI Technical Summary

Problems solved by technology

Among them, the use of inorganic acid as a catalyst has the risk of corroding equipment, and there are many side reactions and complicated processes; the use of solid acid as a catalyst has a high reaction temperature, and the polymerization of product tetrahydrofuran at high temperature and high concentration will increase the amount of tar; using strong acid As a catalyst, cation exchange resin has low reaction temperature and few side reactions, but the conversion rate of 1,4-butanediol is low. If the reaction temperature is increased to increase the conversion rate of raw materials, the service life of the catalyst will be reduced

A large amount of 1,4-butanediol, tetrahydrofuran and the by-products generated during the reaction process are discharged in the form of tar and incinerated, which will cause waste of materials and poor atom economy.

In the separation process of tetrahydrofuran, the combination of high and low pressure rectification towers is commonly used for dehydration, and this method requires a large amount of THF to circulate between the two rectification towers, resulting in high energy consumption for refining and low dehydration efficiency.

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