Equipment for separating waste liquid formed by producing methyl tetrahydrophthalic anhydride

Abstract

The present invention is an equipment for separating and utilizing methyltetrahydrophthalic anhydride to produce waste liquid, comprising a generating device, a sealing cover, a first conveying pipe, a gas conveying port, a separating device, a second conveying pipe, a distillation device, a third conveying pipe and Condenser, the top of the generating device is provided with a sealing cover, the left side of the top of the sealing cover is provided with a first conveying pipe, the bottom of the left side of the first conveying pipe is provided with a gas delivery port, and the bottom of the gas delivery port is provided with A separation device, the left side of the separation device is provided with a second conveying pipe, the left side of the second conveying pipe is provided with a distillation device, the left side of the distillation device is provided with a third conveying pipe, and the left side of the third conveying pipe is provided with Condenser, this kind of equipment that separates and utilizes the production of methyl tetrahydrophthalic anhydride to form waste liquid is used to separate the waste liquid in methyl tetrahydrophthalic anhydride. The main reason is that the existing technology cannot effectively separate the production waste liquid, and often produces The methyl tetrahydrophthalic anhydride produced still remains waste liquid, which affects the production quality. The novel structure is simple and easy to realize.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to a device for separating and utilizing methyltetrahydrophthalic anhydride to produce and form waste liquid. Background technique [0002] Methyl tetrahydrophthalic anhydride is the most commonly used curing agent for epoxy resins. Methyl tetrahydrophthalic anhydride is generally obtained from the by-product C5 fraction of ethylene cracking. Mixed carbon five) is a raw material, and is obtained by reacting with maleic anhydride, methyltetrahydrophthalic anhydride can be obtained by further hydrogenation, and the mixed carbon five of piperylene is reacted with maleic anhydride to generate methyltetrahydrophthalic anhydride. In the reaction, the main reaction with maleic anhydride is piperylene. In addition, a small amount of cyclopentadiene contained in the raw material also undergoes a similar reaction with maleic anhydride to form nadic anhydride, because nadic anhydride is also...

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Problems solved by technology

[0002] Methyltetrahydrophthalic anhydride is the most commonly used epoxy resin curing agent. Methyltetrahydrophthalic anhydride is generally obtained by separating the by-product C5 fraction from ethylene cracking. Mixed carbon five) as raw material, reacted with maleic anhydride, methyl tetrahydrophthalic anhydride can be obtained by further hydrogenation, methyl hexahydrophthalic anhydride, piperylene mixed carbon five and maleic anhydride react to produce methyl tetrahydrophthalic anhydride In the reaction of maleic anhydride, piperylene is mainly reacted with maleic anhydride. In addition, a small amount of cyclopentadiene contained in the raw material also reacts similarly with maleic anhydride to generate nadic anhydride. Because nadic anhydride is also a good cyclopentadiene Oxygen resin curing agent, so Nadic anhydride is usually allowed to exist in methyl tetrahydrophthalic anhydride products without treatment in production. It should be pointed out that piperylene has two isomers, cis and trans. In the reaction between pentadiene and maleic anhydride, only trans-pentadiene participates in the reaction, while cis-pentadiene and other components that do not participate in the reaction in the mixed carbon five pass through the reaction product during the production process. Distillation is separated and becomes the production waste liquid of methyltetrahydrophthalic anhydride. Generally, the ratio of piperylene mixed carbon pentapentadiene trans to cis is between (1.5~3): 1, participating in The reacted trans-piperylene and cyclopentadiene account for about 30-50% of the total amount of raw materials. The production process of Tian Ji. Methyl phthalic anhydride will produce a considerable amount of waste liquid, but the existing technology cannot Effective separation of production waste liquid, often produced methyl tetrahydrophthalic anhydride still remains waste liquid, affecting production quality

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