Comprehensive processing method for waste through production of phthalic anhydride

A technology for comprehensive treatment of pyromellitic dianhydride, which is applied in the field of comprehensive treatment of waste produced by pyromellitic dianhydride, can solve problems such as environmental pollution and resource waste, and achieves high practicability, low energy consumption, Excellent comprehensive performance

Inactive Publication Date: 2017-11-24
常熟联邦化工股份有限公司
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Problems solved by technology

[0003] The production of homoanhydride mainly adopts durene gas-phase air oxidation reaction technology, and its production process is mainly divided into the following four processes: (1) oxidation process, (2) capture process, (3) hydrolysis decolorization process and (4) ) dehydration sublimation process, during this process, will produce waste silica gel balls after decolorization treatment, reaction tail gas and a large amount of high-concentration organic wastewater produced during hydrolysis of homoanhydride. waste and cause serious environmental pollution

Method used

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Embodiment 1

[0023] A comprehensive treatment method for pyromellitic dianhydride production waste. The pyromellitic dianhydride is produced by air gas phase oxidation, and the waste includes waste silica gel balls produced from the dehydration and sublimation process of the production system, The industrial waste gas discharged from the terminal catcher of the production system and the organic wastewater produced during the hydrolysis of homoanhydride;

[0024] Described processing method comprises the steps:

[0025] (1) Treatment of waste silica gel balls: Mix the recovered waste silica gel balls with water at a mass ratio of 1:3~5, then stir at a stirring rate of 50~100r / min to prevent the waste rubber balls from settling, and heat to 98 Boil in water at ~105°C for 10-15 minutes. After boiling, carry out vacuum hot suction filtration under the condition of 0.03MPa. The filtrate is cooled and crystallized to recover the acid. Stir to melt the filter cake, then add activated carbon acco...

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Abstract

The invention discloses a comprehensive processing method for waste through production of phthalic anhydride. The phthalic anhydride is produced by employing an air gas phase oxidation process, the waste comprises waste silica-gel spheres generated from a dehydration sublimation process of a production system, industrial exhaust gas discharged from a trap at an end of a production system, and organic waste water generated during hydrolysis of phthalic anhydride; and the processing method comprises the following steps: 1) waste silica-gel sphere processing; 2) tail gas recovery; 3) organic waste water processing; and 4) waste liquid processing. The comprehensive processing method for waste through production of phthalic anhydride can process and recover all wastes in a solid state, a liquid state or a gas state generated during production of phthalic anhydride, and the wastes enable reasonable recovery and utilization, no secondary refuse is generated, and the comprehensive processing method has the advantages of simple process, high enforceability, low energy consumption, and excellent comprehensive properties.

Description

technical field [0001] The invention relates to the technical field of pyromellitic dianhydride preparation, in particular to a comprehensive treatment method for pyromellitic dianhydride production waste. Background technique [0002] Pyromellitic dianhydride (referred to as homoanhydride) is an important chemical raw material with a wide range of uses [1,2]. Homoanhydride polyimide has excellent electrical insulation and mechanical properties, and is an essential material for aviation, aerospace, electronics, and electrical industries. Its derivatives play an important role in the fields of coatings, plasticizers, adhesives, scale removers, and preservatives. [0003] The production of homoanhydride mainly adopts durene gas-phase air oxidation reaction technology, and its production process is mainly divided into the following four processes: (1) oxidation process, (2) capture process, (3) hydrolysis decolorization process and (4) ) dehydration sublimation process, durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08B01D53/14B09B3/00C07C51/43C07C51/087C07C63/313C02F103/36
CPCB01D53/14B09B3/00C02F1/302C02F1/66C02F1/72C02F1/722C02F9/00C02F2103/36C07C51/087C07C51/43C07C63/313
Inventor 苏仁秋李凤娟王玉山
Owner 常熟联邦化工股份有限公司
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