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An energy-saving and emission-reducing process for producing pyromellitic dianhydride by solvent refining

A pyromellitic dianhydride, solvent refining technology, applied in sustainable manufacturing/processing, chemical industry, climate sustainability, etc., can solve problems such as energy and material waste

Active Publication Date: 2017-04-26
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing system cannot fully exert the effect of the process when performing the process, and will cause a certain waste of energy and materials. Therefore, there is an urgent need for a solvent refining process for pyromellitic dianhydride that saves energy and reduces emissions.

Method used

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  • An energy-saving and emission-reducing process for producing pyromellitic dianhydride by solvent refining

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Embodiment Construction

[0030] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0031] see figure 1 , the embodiment of the present invention includes:

[0032] A solvent refining system for pyromellitic dianhydride, comprising: a reaction kettle 1, a filter 2, a crystallization kettle 3, a centrifuge 4, a dryer 5, a filtrate tank 6, a distillation kettle 7 and a liquid ring vacuum pump unit 8 ;

[0033] The reaction kettle 1 includes a kettle body and a feeding port positioned on the kettle body, a vent opening, an air extraction port and a discharge port, the vent port is located at the upper end of the reaction kettle 1, and is communicated with a vent pipe, and the vent The pipeline at least includes a section of the f...

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Abstract

The invention discloses an energy-saving emission-reduction process for producing pyromellitic dianhydride in a solvent refining method. A solvent refining system of pyromellitic dianhydride is adopted, a liquid circulating vacuum pump unit in the system comprises a condenser and a circulating liquid storage tank, the circulating liquid is solvent capable of being recycled, extracted solvent vapor and heat produced by the rotation of a pump can be completely absorbed after being condensed by the condenser, loss of the circulating liquid is avoided, and the leakage of the solvent vapor is avoided; a centrifugal machine and a filter liquid tank are adopted, so that the solvent is recycled, and an energy-saving and emission-reduction purpose can be realized.

Description

technical field [0001] The invention relates to the field of refining pyromellitic dianhydride, in particular to an energy-saving and emission-reducing process for producing high-end pyromellitic dianhydride by solvent refining. Background technique [0002] Aromatic polyimide film has the characteristics of ultra-high heat resistance, acid and alkali resistance, excellent mechanical properties, electrical properties and dimensional stability, so it is widely used in aviation, aerospace, micro High-tech fields such as electronics and atomic energy. Pyromellitic dianhydride is one of the important raw materials for the production of aromatic polyimide films. With the wide application of aromatic polyimide films, there are more and higher requirements for its quality; As one of the important raw materials of aromatic polyimide film, tetraformic dianhydride has more and higher requirements. [0003] The refining methods of pyromellitic dianhydride mainly include vacuum sublim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D493/04
CPCC07D493/04Y02P20/10
Inventor 苏仁球李凤娟顾雪良王玉山夏炳华周志浩
Owner HUAWEI TEHCHNOLOGIES CO LTD