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Solvent refining method for pyromellitic dianhydride

A pyromellitic dianhydride and solvent refining technology, which is applied in sustainable manufacturing/processing, chemical industry, climate sustainability, etc., can solve the problems of difficult pollution control and high energy consumption of high-end PMDA, and achieve short process flow, The effect of using less equipment and high vacuum degree

Inactive Publication Date: 2012-02-01
常熟联邦化工股份有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to provide a solvent refining method of pyromellitic dianhydride, which solves the problems of high energy consumption and difficult pollution control in the production of high-end PMDA, energy saving and emission reduction, low production cost, and no pollution to the environment

Method used

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  • Solvent refining method for pyromellitic dianhydride
  • Solvent refining method for pyromellitic dianhydride

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Embodiment Construction

[0023] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0024] Such as figure 1 As shown, the present invention discloses a solvent refining method of pyromellitic dianhydride, which is realized through six steps of dissolving and decolorizing, filtering to remove impurities, cooling crystallization, solid-liquid separation, drying and solvent distillation. The filtration and impurity removal, cooling crystallization, solid-liquid separation, drying, solvent distillation and material transportation are all realized by the negative pressure generated by the liquid ring vacuum pump unit.

[0025] In the present invention, the dissolving and decolorizing steps are to dissolve the c...

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Abstract

The invention discloses a solvent refining method for pyromellitic dianhydride. The method comprises six steps of: dissolving and decoloring; filtering to remove impurities; cooling for crystallization; performing solid-liquid separation; drying; and distilling a solvent; and the steps of filtering to remove the impurities, cooling for crystallization, performing solid-liquid separation, drying and distilling the solvent, and the conveying of materials are completed through negative pressure generated by a liquid ring vacuum pump unit. The liquid ring vacuum pump unit has high sucking rate and high vacuum degree; the pumped solvent vapor is condensed by a condenser to form circulation fluid used by the liquid ring vacuum pump unit, the circulation fluid is not lost and the solvent vapor is not leaked, so that the aims of saving energy and reducing emission are fulfilled. In the whole production process, three wastes are hardly generated, the yield and purity of the product are high, and the method is an ideal environment-friendly process.

Description

technical field [0001] The invention relates to the technical field of preparation of pyromellitic dianhydride, in particular to a solvent refining method of pyromellitic dianhydride. Background technique [0002] Environmental protection is the basic state policy of our country. Accelerating the development of the chemical industry must take environmental protection as a prerequisite, and chemical production and construction must develop in harmony with environmental protection. In order to continuously improve my country's environmental quality and protect the global environment, the chemical industry must not only do a good job in the prevention and control of chemical pollution itself, but also provide technical support for pollution prevention and control in other industries, and vigorously develop the chemical environmental protection industry. Chemical industry itself is more likely to produce pollution than other industries, but chemical products are closely related...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D493/04
CPCY02P20/10
Inventor 苏仁球王玉山顾雪良袁珉虹周志浩陈丽萍余文丛
Owner 常熟联邦化工股份有限公司
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