Method for producing KA oil through oxidizing cyclohexane by using air on basis of gas-liquid-solid heterogeneous reaction separation synchronization reactor

Abstract

The invention discloses a method for producing KA oil through oxidizing cyclohexane by using air on the basis of a gas-liquid-solid heterogeneous reaction separation synchronization reactor, wherein the water-containing cyclohexane is added into the reactor, the reactor comprises a reaction tower and at least two constant temperature settlement towers communicated with the bottom of the reaction tower, and the reaction tower is internally provided with a gas phase area, an oxidization area and a gas outlet; the oxidization area and the constant temperature settlement towers are filled with the cyclohexane in the reaction, the air is introduced continuously from the bottom of the oxidization area and is in contact with the cyclohexane to carry out the oxidization reaction, meanwhile, the produced KA oil is blended with water to form a KA oil phase, the KA oil phase is settled into the constant temperature settlement tower, the cyclohexane in the constant temperature settlement tower at the moment enters the oxidization area through an external circulation system, so that the reaction is conducted continuously, the KA oil phase continues to settle in the constant temperature settlement tower until the constant temperature settlement tower is fully filled the KA oil phase, then the reaction tower is switched to be communicated with the other constant temperature settlement tower filled with the cyclohexane, the operation is conducted on the constant temperature settlement towers alternatively to continuously produce the KA oil. The method is used to continuously produce the KA oil with high percent of conversion and high selectivity, the production efficiency is improved, and the production cost is lowered.

Description

technical field [0001] The invention relates to a process for producing KA oil by using air to oxidize cyclohexane, belonging to the field of KA oil production. Background technique [0002] KA oil is a mixture of cyclohexanol and cyclohexanone, which is the basic chemical raw material for the production of Nylon 6 and Nylon 66. Industrially, liquid-phase air oxidation of cyclohexane is the main method for preparing KA oil. At present, the method for producing KA oil by oxidation of cyclohexane in industry is the non-catalyzed oxidation method of Stamica Company in the Netherlands. In this method, the liquid-phase air oxidation of cyclohexane is carried out under high temperature and high pressure conditions, and the reaction yield is low. Product selectivity is poor. At present, the best conversion rate of cyclohexane that can be achieved in industry is 4%, and the yield of KA oil is 82%. Patent CN1191218 discloses a method for preparing KA oil by air oxidation of cycloh...

AI Technical Summary

Problems solved by technology

The continuous process of insoluble products can be realized by adding solvents; however, the addition of solvents makes the chemical production process complicated, and also increases the corresponding equipment investment and energy consumption, material consumption and environmental pollution by solvents; another One option is to use interstitial operations to produce

In the above two schemes, the residence time of the reaction product in the reaction system will be increased, and under the reaction operating conditions, the reaction product will be decomposed or deeply reacted, resulting in a decrease in the selectivity and yield of the reaction product

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