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

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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

Method used

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  • Methyl tetrahydrophthalic anhydride continuous production system and method

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Experimental program
Comparison scheme
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Example Embodiment

[0018]Example 1

[0019]Such asfigure 1As shown, the methyl tetrahydrodoricide continuous production system includes a tumbling reactor 7, a carbon five reservoir 1, an anhydride tank 2, a thin film evaporator 8, a carbon five receiving tank 10, a heat insulator 12, and a finished product. The groove 15, the carbon five reservoir 1 is connected to the tower reactor 7 by the first magnetic pump 3, and the chloric anhydride tank 2 is connected to the tower reactor 7 by the second magnetic pump 4, the tower reactor 7 is connected to the thin film evaporator 8, The thin film evaporator 8 includes a steam outlet and a liquid outlet, and the steam outlet is connected to the carbon five receiving groove 10 through the first condenser 9, and the liquid outlet is attached to the adhesive soula 12, the liquid outlet and the adiabatizer 12 are provided with a catalyst fixture 11. The adiabatic evaporator 12 is connected to the finished tank 15 after connecting the second condenser 14 by the third...

Example Embodiment

[0025]Example 2

[0026]The rawmetry of the molar ratio of 1: 1.05 was delivered to the tower reactor by the first metering pump and the second metering pump, respectively, and the synthesis temperature in the tower reactor was 70-75, respectively. At ° C, it is ensured that the reactant residence time in the tower reactor after 40 seconds, the temperature control is controlled in a thin film evaporator of 116-118 ° C, and in a state of vacuum is greater than -0.98 MPa, the condensed recovery is unreacted carbon 5. The bottom liquid entry temperature is provided in a heat transfer oil in which 170-175 ° C is heated. After heating, it is heated to carry out an isomerization reaction in a catalyst fixture with a catalyst, and then enter the control temperature in an adiabatic evaporator in 136-140 ° C. . The gasified product is condensed through the second condenser. Finally, the product yield was 98.92%, and the isomerization depth was 36.7%.

Example Embodiment

[0027]Example 3

[0028]The rawmetry of the carbon with carbon five is 1: 1.10 is delivered to the tower reactor by the metering pump, and the synthesis temperature is 70-73 ° C to ensure that the reactant resorts within 30 in the tower reactor. After seconds, the temperature was controlled in a thin film evaporator at 112-115 ° C, and the unreacted carbon 5 of the condensation recovered was removed in a state of the vacuum greater than -0.98 MPa. In the heat transfer oil in which the bottom liquid enters the temperature of 165-170 ° C, isomeric reactions in a catalyst fixture with a catalyst, and then enter the heat insulator of 132-135 ° C, gasification The product is condensed through the second condenser. Finally, the product yield was 98.73%, and the isomerization depth 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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