Decomposition method of cyclohexyl hydrogen peroxide

Abstract

The decomposition method of cyclodexyl hydrogen peroxide is characterized by that under the heterogeneous condition intermittently or continuously adding solid alklouli catalyst whose PKa=10-47 in decomposition reactor, controlling the weight ratio of the solid alkali catalyst and cyclodexane oxide product in 1:20-1:300, reaction temp. is 10 deg.C-170 deg.C, reaction time is 5-200 min. and can decompose the cyclodexyl hydrogen peroxide into cyclodexanone and cyclodexanol.

Description

technical field [0001] The invention relates to a method for decomposing cyclohexyl hydroperoxide, in particular to a method for decomposing cyclohexyl hydroperoxide produced in the process of preparing cyclohexanone, cyclohexanol and KA oil by oxidation of cyclohexane. technical background [0002] In the prior art, cyclohexane is oxidized to produce cyclohexanone, cyclohexanol, and KA oil. First, cyclohexane is catalyzed or oxidized under a certain temperature and pressure to obtain cyclohexyl hydroperoxide; Then cyclohexyl hydroperoxide is decomposed to obtain cyclohexanone, cyclohexanol, KA oil. The decomposition methods of cyclohexyl hydroperoxide are as follows: [0003] 1. Using cobalt salt catalysis to carry out two-phase decomposition under the action of aqueous sodium hydroxide solution, the peroxide decomposition yield of this method can only reach 90%-93%, the consumption of raw materials per unit of cyclohexanone is relatively high, and a large amount of causti...

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Problems solved by technology

[0003] 1. Using cobalt salt catalysis to carry out two-phase decomposition under the action of aqueous sodium hydroxide solution, the peroxide decomposition yield of this method can only reach 90%-93%, the consumption of raw materials per unit of cyclohexanone is relatively high, and a large amount of caustic soda is consumed. A large amount of saponification waste lye is produced, and the treatment of waste lye is difficult and costly

[0004] 2. The homogeneous catalytic decomposition method adopted by Phone Puolonc in France, that is, adding an oil-soluble chromium salt catalyst to the oxidation product, without adding sodium hydroxide and water, and implementing low-temperature homogeneous decomposition. This method basically does not consume alkali , but the decomposition rate of peroxide is low, and the decomposition reactor is prone to fouling, so it needs to be shut down once every six months for cleaning

[0005] 3. U.S. Patent U.SP4, 482746 proposes adding two metals, cobalt and chromium, as catalysts in the homogeneous catalytic decomposition, which can significantly increase the ketone / alcohol ratio, but the fouling of the homogeneous catalytic decomposition requires periodic cleaning of the system, which affects continuous drive