Method for preparing methyl tetrahydrophthalic anhydride and synthesis system

Abstract

The invention discloses a method for preparing methyl tetrahydrophthalic anhydride and a synthesis system thereof. The method for preparing methyl tetrahydrophthalic anhydride comprises the followingsteps: pretreatment of maleic anhydride, pretreatment of petroleum fraction C5, synthesis operation of diolefin, and isomerization of a diolefin reaction material. The synthesis system comprises a diene reaction device, a maleic anhydride pretreatment device, a raw material storage device and an isomerization reaction device; wherein the diene reaction device comprises a diene reaction kettle, a first stirring mechanism and a first C5 recovery mechanism, a reaction cavity and a heat preservation cavity are formed in the diene reaction kettle, and the isomerization reaction device comprises anisomerization reaction kettle, a reduced pressure distillation collection device and a second C5 recovery mechanism. By adopting the preparation method, the utilization rate of maleic anhydride is high, and the yield of a target product is relatively high; the synthesis system disclosed by the invention has the advantage of improving the production efficiency of methyl tetrahydrophthalic anhydride. The problem that in the prior art, the production efficiency of methyl tetrahydrophthalic anhydride is low is solved.

Description

technical field [0001] The invention relates to the field of preparation of methyltetrahydrophthalic anhydride, in particular to a method and a synthesis system for preparing methyltetrahydrophthalic anhydride. Background technique [0002] Methyltetrahydrophthalic anhydride, the molecular formula is C 9 h 10 0 3 , is a new type of liquid organic acid anhydride epoxy resin curing agent with excellent performance, with high purity, light color, low viscosity, low volatility, low toxicity, small heating loss, stable performance, long pot life, low freezing point and room temperature Under the excellent characteristics of long-term storage, it is widely used in epoxy resin potting materials, casting materials, bonding, lamination, impregnation, molding and winding processes, and is also suitable for insulating bushings, oil pipelines, fishing machinery, etc. For example: casting and filling electronic components, large dry-type transformers, high-voltage switches, capacitors...

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Problems solved by technology

[0008] The prior art scheme in the above-mentioned has the following defects: adopt the above-mentioned intermittent production process to prepare methyltetrahydrophthalic anhydride, along with the dropwise addition of petroleum fraction carbon five liquid, the maleic anhydride in the methyltetrahydrophthalic anhydride solution A large amount of consumption, the concentration of maleic anhydride is low, and the reaction rate decreases, resulting in a low conversion rate of maleic anhydride

Simultaneously prior art is in order to improve the conversion rate of maleic anhydride, adopts the dripping amount that improves petroleum fraction C5 and increases the holding time after the petroleum fraction C5 liquid is added dropwise, what brings is that the operating process of whole reaction is longer , and the increase in the amount of C5 added in petroleum fractions will not only increase the consumption of raw materials, but also lead to a further extension of the operation time for subsequent atmospheric distillation to remove the residual C5 in petroleum fractions, making the production of methyltetrahydrophthalic anhydride lower volume

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