Reaction rectification device and method for preparing cyclohexanol by hydrating cyclohexene

Abstract

The invention belongs to the technical field of a chemical process and equipment, and relates to a reaction rectification device and a reaction rectification method for preparing cyclohexanol by hydrating cyclohexene. The device comprises four parts, namely a reaction rectification tower, a settling separator, a separation tower and a liquid storage tank. Steam and slurry in the reaction rectification tower are in reverse contact to generate violent disturbance, so that the cyclohexene hydration reaction process is realized; reaction products are subjected to settling separation and only the organic phase is added into a stripping section, so that reverse reaction of the cyclohexanol can be inhibited; in the settling separator, the aqueous phase and the organic phase are separated, and water and a catalyst can be recycled; the cyclohexene, a cosolvent and the cyclohexanol in the separation tower are separated to obtain high-purity cyclohexanol, and the cyclohexene and the cosolvent canbe recycled; and the high-purity cyclohexanol is stored in the liquid storage tank. By the device and the method, the problems that conversion per pass of the cyclohexene is low and the reaction energy consumption is high in the cyclohexene hydration reaction; moreover, the device and the method has the following advantages: the whole flow can be operated continuously and stably, the water and the catalyst can be recycled, and the cyclohexene and the cosolvent can be recycled.

Description

technical field [0001] The invention belongs to the technical field of chemical technology and equipment, and relates to a reactive distillation device and method for preparing cyclohexanol through hydration of cyclohexene. Background technique [0002] Cyclohexanol is an excellent organic chemical product with a medium to high boiling point, mainly used as an intermediate raw material for the production of important chemical products such as adipic acid, caprolactam and polyamide-66; in the coating industry as a solvent for paint, shellac and varnish, It has good emulsifying ability; it can be used as a dye solvent and matting agent in the textile industry; it can also be used as a stabilizer for water-soluble latex. Traditional methods for producing cyclohexanol include phenol hydrogenation and cyclohexane oxidation, but these methods have problems such as complex raw material preparation process, poor operation safety, low conversion rate, high raw material cost, and larg...

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Problems solved by technology

In 2014, it was reported that macroporous resin 15 catalyst was used to simulate reactive distillation process. In 2017, Fuzhou University used ion exchange resin A-36 catalyst to simulate reactive distillation process. However, macroporous resin 15 and ion exchange resin A -36 has disadvantages such as poor mechanical strength, poor thermal stability, and short service life.

Although the reactive distillation method can theoretically greatly increase the conversion rate of cyclohexene and reduce the energy consumption of the system, the hydration reaction speed is slow. This process increases the concentration of cyclohexene in water by adding a co-solvent to the reactive distillation system. Solubility, speed up the hydration reaction rate of cyclohexene, can be used to solve the existing problems in the current industrial production

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