Method for preparing cyclohexanol by hydrolyzing cyclohexyl formate

Abstract

The invention discloses a novel 'backpack type' reaction rectification process for preparing cyclohexanol by hydrolysis. The process comprises the following steps: placing backpack type reactors outside a rectification tower; continuously feeing cyclohexyl formate into the first backpack type reactor for hydrolysis reaction; feeding materials into the rest of the backpack type reactors from a former tower plate of the rectification tower; putting reaction products into the next tower plate of the rectification tower to obtain a product with the cyclohexanol mole fraction of 95 percent or above. The 'backpack type' reaction and the rectification tower are interrelated to and independent from each other, and the coupling mode can keep the advantages of a reaction rectification integrated technology and enable operation conditions of the reactors and the rectification tower to be independent from each other; therefore, the novel process is short in process flow, flexible in operation control, low in production cost and high in economic benefit; meanwhile, the volumes and the reaction amounts of the reactors can be freely adjusted, so that optimal matching between the reaction property and the separation capacity is realized, and large-scale industrial production is facilitated.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a new production process of cyclohexanol, in particular to a method for preparing cyclohexanol by hydrolysis of cyclohexyl formate, which is a method of using cyclohexyl formate and water as raw materials, through "backpack type "The method of preparing cyclohexanol by the coupling process of reaction and rectification in the reactor. Background technique [0002] Cyclohexanol is an important chemical intermediate used in the production of nylon, adipic acid, caprolactam and other chemical products. In my country, cyclohexanol is mainly used as an intermediate in the production of adipic acid and amine compounds. [0003] The traditional preparation methods of cyclohexanol mainly include cyclohexane oxidation method and phenol hydrogenation method. At present, cyclohexane oxidation method is mainly used in industry. Patent CN102627541A introduces a process and equipment for prepa...

AI Technical Summary

Problems solved by technology

Since the traditional reactive distillation coupling is carried out in the same column, the negative pressure operation of the reactive distillation column causes the temperature of the reaction tray to be 15-30°C, which greatly reduces the reaction rate, and the loading and unloading of the catalyst on the rectification tray It is difficult to replace

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