Methyl tetrahydrophthalic anhydride continuous production system and method

A technology of methyltetrahydrophthalic anhydride and a production system, applied in the chemical industry, can solve the problems of not really realizing continuous production of methyltetrahydrophthalic anhydride, low efficiency, etc., and achieve improved product quality stability, low energy consumption, and residence time. the effect of shortening

Pending Publication Date: 2021-04-16
JIAXING ZHENGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis reaction kettle synthesizes a pot of semi-finished products and then enters the magnetic isomerization reaction kettle for treatment, that is, the whole reaction is carried out in batches, so this process belongs to the optimization and upgrading of the batch production process, and does not really realize the methyl tetrahydrophthalic anhydride Continuous production, there is a problem of low efficiency

Method used

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  • Methyl tetrahydrophthalic anhydride continuous production system and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, the continuous production system of methyl tetrahydrophthalic anhydride includes a tower reactor 7, a carbon five storage tank 1, a maleic anhydride storage tank 2, a thin film evaporator 8, a carbon five receiving tank 10, an adiabatic evaporator 12 and a finished product Groove 15, carbon five storage tank 1 is connected tower reactor 7 by first magnetic force pump 3, and maleic anhydride storage tank 2 is connected tower reactor 7 by second magnetic force pump 4, and tower reactor 7 is connected thin film evaporator 8, The thin film evaporator 8 includes a steam outlet and a liquid outlet, the steam outlet is connected to the carbon five receiving tank 10 through the first condenser 9, the liquid outlet is connected to the adiabatic evaporator 12, and a catalyst holder 11 is arranged between the liquid outlet and the adiabatic evaporator 12 , the adiabatic evaporator 12 is connected to the second condenser 14 through the third magnetic pump...

Embodiment 2

[0026]The raw material with a molar ratio of maleic anhydride to C5 of 1:1.05 is transported to the tower reactor at 5T / h through the first metering pump and the second metering pump respectively, and the synthesis temperature in the tower reactor is controlled to be 70-75 ℃, to ensure that the reactant stays in the tower reactor for 40 seconds and then enters the thin-film evaporator whose temperature is controlled at 116-118℃. Under the condition of vacuum greater than -0.98MPa, the unreacted C5 is extracted and condensed to recover. The liquid at the bottom enters the heat-conducting oil heating jacket pipe whose temperature is set at 170-175°C. After heating, it enters the catalyst holder with catalyst for isomerization reaction, and then enters the adiabatic evaporator whose temperature is controlled at 136-140°C. . The vaporized products are condensed and collected by the second condenser. Finally, the product yield was 98.92%, and the degree of isomerization was 36.7%....

Embodiment 3

[0028] The raw material with a molar ratio of maleic anhydride to C5 of 1:1.10 is transported to the tower reactor at 4T / h through a metering pump, and the synthesis temperature is controlled at 70-73°C to ensure that the residence time of the reactants in the tower reactor is 30 Seconds later, it enters the thin-film evaporator whose temperature is controlled at 112-115°C, and under the condition of vacuum greater than -0.98MPa, the unreacted C5 is extracted and condensed to recover. The liquid at the bottom enters the jacketed pipe heated by heat transfer oil at a temperature of 165-170°C, undergoes isomerization reaction in a catalyst holder with a catalyst, and then enters an adiabatic evaporator with a controlled temperature of 132-135°C for gasification The product is condensed and collected by the second condenser. Finally, the product yield was 98.73%, and the degree of isomerization was 35.8%.

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Abstract

The invention discloses a methyl tetrahydrophthalic anhydride continuous production system and method. The production system comprises a tower reactor, a C5 storage tank, a maleic anhydride storage tank, a film evaporator, a C5 receiving tank, a heat insulation evaporator and a finished product tank, the C5 storage tank is connected with the tower reactor through a first magnetic pump, and the maleic anhydride storage tank is connected with the tower reactor through a second magnetic pump; the tower reactor is connected with the film evaporator, the film evaporator comprises a steam outlet and a liquid outlet, the steam outlet is connected with the C5 receiving tank through a first condenser, the liquid outlet is connected with a heat insulation evaporator, and a catalyst fixer is arranged between the liquid outlet and the heat insulation evaporator; and the heat insulation evaporator is connected with a second condenser through a third magnetic pump and then connected with the finished product tank. According to the methyl tetrahydrophthalic anhydride continuous production system, continuous production of methyl tetrahydrophthalic anhydride is truly achieved, compared with a traditional process, the efficiency is improved by about 200%, reaction is more thorough, meanwhile, the C5 amount input is reduced, energy consumption is reduced, and the product yield and quality are improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a continuous production system and method of methyltetrahydrophthalic anhydride. Background technique [0002] Liquid methyl tetrahydrophthalic anhydride has the characteristics of light color, non-volatile, low toxicity, stable performance, low freezing point, long-term sealed storage at room temperature, low viscosity, and good compatibility with various epoxy resins. Its curing It has excellent electrical properties and heat resistance, and can be combined with epoxy resin and fillers to form insulating potting materials and castables. It is widely used in electronic and electrical industries, aerospace industries and other fields. Methyltetrahydrophthalic anhydride is prepared by polymerizing maleic anhydride with piperylene and isoprene in C5. The product has two isomers, namely 4-methyltetrahydrophthalic anhydride and 3-methyltetrahydrophthalic anhydri...

Claims

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Application Information

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IPC IPC(8): C07D307/89
Inventor 杨丽艳沈建琴范鸿炜邱艳慧史沈明吴荣明
Owner JIAXING ZHENGDA CHEM
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