Method for preparing cyclohexanol and cyclohexanone based on multi-layer guide cylinder bubbling reactor

Abstract

The invention discloses a method for preparing cyclohexanol and cyclohexanone based on a multi-layer guide cylinder bubbling reactor. The method comprises the following steps: in a multi-layer guide cylinder bubbling reactor, oxidizing cyclohexane with an oxygen-containing gas to generate a cyclohexyl hydroperoxide-containing oxidation liquid, extracting an oxidation liquid with a strong base solution so as to obtain a cyclohexyl hydroperoxide-containing alkali water phase and a cyclohexane organic phase, performing a decomposition reaction on the cyclohexyl hydroperoxide-containing alkali water phase in the presence of a high-melting point solvent, performing sedimentation separation on a decomposition liquid, distilling the cyclohexane organic phase so as to obtain a mixture of cyclohexanol and cyclohexanone, and feeding back the extracted cyclohexane solution to the cyclohexane oxidation reaction process. By adopting the method, the oxidation selectivity and the reaction efficiencyof the cyclohexane can be greatly improved, and the cyclohexane distillation energy consumption can be reduced.

Description

technical field [0001] The invention relates to a method for preparing cyclohexanol and cyclohexanone, in particular to a method for preparing cyclohexanol and cyclohexanone based on a multilayer draft tube bubbling reactor; it belongs to the technical field of KA oil preparation. Background technique [0002] To prepare cyclohexanol and cyclohexanone, cyclohexane is usually oxidized with a gas containing molecular oxygen. First, a cyclohexane oxidation solution containing cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone is generated, and then cyclohexane is treated Oxidize the liquid, decompose the cyclohexyl hydroperoxide in it to generate cyclohexanol and cyclohexanone, then distill the unreacted cyclohexane for recycling, and the reaction product is obtained through multiple rectifications to obtain cyclohexanol and cyclohexanone. [0003] The cyclohexane oxidation reactor is generally a bubble tower, and internal components such as a draft tube can be added to t...

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Problems solved by technology

Increasing the oxidation conversion rate of cyclohexane can reduce the evaporation of cyclohexane, but increasing the conversion rate will lead to a decrease in the selectivity of the target product, resulting in an increase in material consumption; reducing the oxidation conversion rate of cyclohexane can increase the selectivity of the target product, but the product The proportion of cyclohexane in the medium is higher, and more cyclohexane needs to be evaporated

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