Method for producing benzoic acid

A production method and technology of benzoic acid, which are applied in the fields of hydrocarbon liquid phase oxidation and rectification separation, can solve the problems of high energy consumption, long reaction time, and low product yield, and achieve reduced toluene unit consumption, shortened reaction time, and refined The effect of shortening the distillation time

Active Publication Date: 2009-07-29
BEIJING HONGYUESHUN CHEM FACTORY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the technical problems of long reaction time, long rectification and separation time, low yield, high energy consumption, high cost, low product yiel

Method used

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  • Method for producing benzoic acid

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Embodiment 1

[0015] Each batch of raw material toluene was put into 10 tons, and the catalyst was put into 20 kg of cobalt naphthenate. The oxidation reaction time was 10 hours, the reaction temperature was 165°C, and the reaction pressure was 0.58Mpa. When the oxidation reaction was stopped for 10 hours, the oxidation tail gas was sampled and analyzed. In the tail gas, O 2 The content is 20.180%, the reaction is complete, and the conversion rate is 78%.

Embodiment 2

[0017] Each batch of raw material toluene was put into 12 tons, and 24 kg of catalyst cobalt naphthenate was put in. The oxidation reaction time was 9 hours, the reaction temperature was 160°C, and the reaction pressure was 0.60Mpa. When the oxidation reaction was stopped for 9 hours, the oxidation tail gas was sampled and analyzed, and O in the tail gas 2 The content is 20.517%, the reaction is complete, and the conversion rate is 82%.

Embodiment 3

[0019] Each batch of raw material toluene was put into 12 tons, and 24 kg of catalyst cobalt naphthenate was put in. The reaction temperature was 160°C, the reaction pressure was 0.59Mpa, and the reaction time was 8 hours. When the oxidation reaction was stopped for 8 hours, the oxidation tail gas was sampled and analyzed. In the tail gas, O 2 The content is 17.28%, the reaction is not complete, and the conversion rate is 71%.

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Abstract

A benzoic acid production method solves the technical problems of the existing production method such as long reaction time, long rectification separation time, low yield, high energy consumption, high cost, low product output and poor quality. In the production method, cobalt naphthenate is used as a catalyst to oxidize toluene and then the product obtained in the oxidation reaction is rectified to obtain the final product. The oxidization time is 8 to 10 hours, the reaction temperature is 155 to 165 DEG C and the reaction pressure is 0.55 to 0.62MPa; the rectification separation time is 4.5 to 7 hours, the rectification temperature is 177 to 190 DEG C, the rectification pressure is -0.09 to -0.085MPa and the reflux time is 0.5 to 1.5 hours. The invention with simple process, short flow, low energy consumption and no pollution can be used in the large-scale production of benzoic acid.

Description

technical field [0001] The invention relates to a process method for liquid phase oxidation and rectification separation of hydrocarbons, in particular to a method for producing benzoic acid. Background technique [0002] Benzoic Acid is a fine chemical product, which can be divided into food and pharmaceutical grade and industrial grade according to its application. It can be widely used in the fields of medicine, food, flavor, preservative, plasticizer, mordant and organic synthesis. [0003] At present, the industrial production of benzoic acid generally uses toluene as a raw material, uses cobalt naphthenate or cobalt sulfate as a catalyst, and undergoes an oxidation reaction to obtain crude benzoic acid, which is then put into a rectifying tower for vacuum distillation and separation, and the obtained product The purity of benzoic acid is about 98%. The benzoic acid produced by the existing production technology has the advantages of long reaction time, long rectificat...

Claims

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Application Information

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IPC IPC(8): C07C63/06C07C51/44C07C51/265
Inventor 王连成
Owner BEIJING HONGYUESHUN CHEM FACTORY
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