A method and system for preparing cyclohexyl acetate and separating cyclohexane and acetic acid

A technology of cyclohexyl acetate and cyclohexane, which is applied in the direction of carboxylate preparation, chemical instruments and methods, distillation purification/separation, etc., can solve the problems of unsuitability for large-scale industrial production, high cost, and low output, and achieve Reduce investment cost and operating cost, reduce separation energy consumption, and shorten the effect of separation process
CN108976127BActive Publication Date: 2021-07-30CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2021-07-30

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Abstract

The invention relates to a method for removing acetic acid from cyclohexane in preparation of cyclohexyl acetate by reactive distillation, and belongs to the field of petrochemical technology development. In the present invention, the mixture of cyclohexene and cyclohexane obtained by partial hydrogenation of benzene is used as a raw material, and in the process of preparing cyclohexyl acetate by reacting with acetic acid in a reactive distillation tower, the water phase at the top of the reactive distillation tower is circulated and refluxed, and combined with Cyclohexane in the tower forms an azeotrope, thereby reducing or eliminating the azeotropy between cyclohexane and acetic acid, and obtaining cyclohexane with an acetic acid content of less than 5wt%; then distilling cyclohexane through a simple azeotropic rectification tower to remove cyclohexane acetic acid in. The invention has simple process, strong parameter controllability, low energy consumption and material consumption, and is convenient for large-scale industrial application.
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Description

technical field

[0001] The invention relates to a method for preparing cyclohexyl acetate by reactive distillation and removing acetic acid by cyclohexane, and belongs to the field of petrochemical technology development. Background technique

[0002] Cyclohexyl acetate is a liquid with banana or apple aroma, and the fruity flavor prepared with it is widely used in food, beverage and cosmetic industries. In addition, cyclohexyl acetate has good solubility for resins, and is often used as an environmentally friendly solvent for high-grade paints and paints. Ethanol and cyclohexanol can be obtained by hydrogenation of cyclohexyl acetate. Ethanol is the raw material of ethanol gasoline, and cyclohexanol is the raw material of nylon 6 and nylon 66. The industrial application prospect of cyclohexyl acetate is broad.

[0003] Before the 1980s, cyclohexyl acetate was synthesized by the reaction of cyclohexanol and acetic acid, and the output was low cost, which was not suitable fo...

Claims

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