Benzoic acid purification method and purification equipment

A purification method, benzoic acid technology, applied in the separation/purification of carboxylic acid compounds, chemical industry, climate sustainability, etc., can solve the problems of easy agglomeration, difficult centrifugation, high flash point of benzoic acid, etc., and achieve production cost Low, simple structure effect

Pending Publication Date: 2019-01-22
辽宁华亿化工实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, benzoic acid is easy to agglomerate after crystallization, and benzoic acid has a high flash point, so it is not easy to centrifuge in the later stage

Method used

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  • Benzoic acid purification method and purification equipment

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Effect test

specific Embodiment 1

[0017] Benzoic acid purification method is characterized in that:

[0018] (1) The benzoic acid solution obtained by oxidation of toluene has a mass content of 51% benzoic acid. The benzoic acid solution crystallizes and hangs on the wall in a tube at 110-120 °C, and the crystals on the inner wall of the tube melt at 130-140 °C and is purified to obtain The mass content of benzoic acid solution is 95.2%;

[0019] (2) Repeat the operation of step (1) for the benzoic acid solution obtained by melting and recycling, and the mass content of benzoic acid in the finally obtained benzoic acid solution is 99.8%.

specific Embodiment 2

[0020] Please refer to the attached figure 1 Shown, be used to realize the benzoic acid purification device of described benzoic acid purification method, it is characterized in that, comprise toluene oxidation liquid storage tank 1, crystallization tubular heat exchanger 2, semi-finished product tank 3, finished product tank 4, toluene oxidation liquid The discharge port of storage tank 1 is connected to the feed port of crystallization tubular heat exchanger 2 through the feeding pump 6, and the discharge port of crystallization tubular heat exchanger 2 is connected to semi-finished tank 3, finished product tank 4, and toluene oxidation liquid storage tank 1 are connected separately, valves are respectively provided on the pipelines connecting the outlet of the crystallization tubular heat exchanger 2 with the semi-finished tank 3, the finished product tank 4, and the toluene oxidation liquid storage tank 1, and the semi-finished tank 3 is connected to the crystallization tub...

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Abstract

The invention relates to a benzoic acid purification method and purification equipment for realizing the purification method. A benzoic acid solution undergoes crystallization and wall hanging in a 110-120DEG C tube nest, and crystals on the inner wall of the tube nest are dissolved at 130-140DEG C and purified. The discharge port of a toluene oxidation liquid storage tank is connected to the feedinlet of a crystal tube nest heat exchanger, the discharge port of the crystal tube nest heat exchanger is connected to a semi-finished product tank, a finished product tank and the toluene oxidationliquid tank respectively, the semi-finished product tank is connected to the feed inlet of the crystal tube nest heat exchanger through a circulating pump, and the inside of the crystal tube nest heat exchanger shell is heated or cooled by heat conducting oil. The equipment provided by the invention has a simple structure, can realize purification of benzoic acid, also the equipment is energy saving and is low in production cost.

Description

technical field [0001] The invention relates to the field of chemical production of benzoic acid, in particular to a method for purifying benzoic acid and a purification device for realizing the method. Background technique [0002] At present, in industrial production, toluene is oxidized with air to obtain benzoic acid. The oxidizing solution contains unreacted toluene and by-products, which affect the purity of benzoic acid. The gasification distillation separation method requires a large investment in equipment and wastes energy. Crystallization is the best purification method for organic matter, and requires less crystallization equipment, and saves energy compared to distillation. However, benzoic acid is easy to agglomerate after crystallization, and the flash point of benzoic acid is high, so it is not easy to be separated by centrifugation in the later stage. Contents of the invention [0003] In order to solve the problems referred to above, provide a kind of sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/43C07C63/06
CPCC07C51/43C07C63/06Y02P20/10
Inventor 赵寒松
Owner 辽宁华亿化工实业有限公司
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