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Method for synthesizing methacrylic anhydride

A technology of methacrylic anhydride and methacrylic acid, applied in the field of organic synthesis, can solve the problems of inability to overcome the intermittent production mode, unsuitable for industrial production, high production efficiency and energy consumption, and achieves high production efficiency, convenient for industrialization, and high product quality. Stable quality effect

Inactive Publication Date: 2018-06-08
HANGZHOU HOLLYSYS AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low production efficiency, high energy consumption and high by-products of the first type of synthesis reaction, the second type of batch reaction distillation is generally used to synthesize methacrylic anhydride in actual production.
Although the efficiency of the second type of batch reaction distillation process has been improved compared with the first type, it still cannot overcome the batch production mode. The production efficiency and energy consumption are still high, and by-products are easy to be produced, so it is not suitable for industrial production.

Method used

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  • Method for synthesizing methacrylic anhydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) Methacrylic acid enters the first heat exchanger (01) at the methacrylic acid inlet (014) for preheating. After preheating, the temperature is controlled by the temperature control device (011) to be 95 ° C, and enters the reactive distillation tower ( 04), keep a vacuum of -11KPa in the reactive distillation tower (04), and methacrylic acid is sucked in the reactive distillation tower (04) through the negative pressure in the reactive distillation tower (04), and is carried out through the atomizer (045). Atomization; At the same time, acetic anhydride enters the second heat exchanger (02) at the acetic anhydride inlet (024) for preheating. After preheating, the temperature is controlled by the temperature control device (021) to be 85 ° C, and enters the reactive distillation column (04 ), acetic anhydride is inhaled in the reactive distillation tower (04) by negative pressure in the reactive distillation tower, and is atomized through the atomizer (045) in the tow...

Embodiment 2

[0074](1) Methacrylic acid enters the first heat exchanger (01) at the methacrylic acid inlet (014) for preheating. After preheating, the temperature is controlled to 90°C by controlling the temperature control device (011), and enters the reactive distillation tower ( 04), keep a vacuum of -12KPa in the reactive distillation tower (04), methacrylic acid is sucked in the reactive distillation tower (04) through the negative pressure in the reactive distillation tower (04), and is carried out through the atomizer (045). Atomization; At the same time, acetic anhydride enters the second heat exchanger (02) at the acetic anhydride inlet (024) for preheating. After preheating, the temperature is controlled by the temperature control device (021) to be 90 ° C and enters the reactive distillation column (04 ), acetic anhydride is inhaled in the reactive distillation tower (04) by negative pressure in the reactive distillation tower, and is atomized through the atomizer (045) in the to...

Embodiment 3

[0079] (1) Methacrylic acid enters the first heat exchanger (01) at the methacrylic acid inlet (014) for preheating. After preheating, the temperature is controlled to be 100°C by controlling the temperature control device (011), and enters the reactive distillation tower ( 04), the vacuum in the reactive distillation tower (04) is maintained at -10KPa, and methacrylic acid is sucked into the reactive distillation tower (04) through the negative pressure in the reactive distillation tower (04), and is carried out through the atomizer (045). Atomization; At the same time, acetic anhydride enters the second heat exchanger (02) at the acetic anhydride inlet (024) for preheating. After preheating, the temperature is controlled by the temperature control device (021) to be 80 ° C and enters the reactive distillation column (04 ), acetic anhydride is inhaled in the reactive distillation tower (04) by negative pressure in the reactive distillation tower, and is atomized through the at...

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Abstract

The invention provides a method for synthesizing methacrylic anhydride. The method comprises the following steps: (a) preheating and mixing methacrylic acid and acetic anhydride, carrying out a reaction under vacuum, and then carrying out rectification to obtain acetic acid and methacrylic anhydride respectively; (b) condensating the acetic acid obtained in the step (a), mixing the condensated acetic acid with a polymerization inhibitor, carrying out backflow, mixing with the methacrylic anhydride obtained in the step (a), and after stabilization, continuously producing the methacrylic anhydride. Compared with the prior art, according to the method for synthesizing methacrylic anhydride provided by the invention, through continuous feeding, continuous reaction rectification and the backflow, continuous production of methacrylic anhydride is realized, the whole process trends to be stable, rectification of continuous reaction can be realized, and the production efficiency is high; the method is high in reaction conversion rate and stable in product quality. Experimental results show that, according to the method for synthesizing methacrylic anhydride provided by the invention, the conversion rate of the raw material methacrylic acid is 99% or higher, the product yield is 90% or higher, and the purity is 95% or higher.

Description

technical field [0001] The invention relates to the technical field of organic compound synthesis, and more specifically, relates to a method for synthesizing methacrylic anhydride. Background technique [0002] Methacrylic anhydride is a strong esterification agent, and it is a necessary reagent for the preparation of methacrylic acid thioester, methacrylamide and methacrylate (especially esters of tertiary alcohols), and can be used as a cross-linking agent in polymerization reactions. The coupling agent is used in the synthesis of materials such as photocurable coatings and cross-linked resins, and can also be used as a raw material for the synthesis of special fine chemicals, which has broad market application prospects. [0003] At present, the techniques for synthesizing methacrylic anhydride disclosed in the prior art are mainly divided into two categories: the first category is the synthesis reaction first, and the rectification starts after the reaction is completed...

Claims

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Application Information

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IPC IPC(8): C07C57/04C07C51/56C07C51/573
CPCC07C51/56C07C51/573C07C57/04
Inventor 薛亮亮
Owner HANGZHOU HOLLYSYS AUTOMATION
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