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Method for preparing methyl tetrahydrophthalic anhydride and synthesis system

A technology of methyltetrahydrophthalic anhydride and maleic anhydride, applied in the field of preparation of methyltetrahydrophthalic anhydride, method and synthesis system, can solve the problem of decreased reaction rate and prolongation of the operation time of C5 in petroleum fractions , low conversion rate of maleic anhydride, etc.

Active Publication Date: 2020-10-02
嘉兴南洋万事兴化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Method for preparing methyl tetrahydrophthalic anhydride and synthesis system
  • Method for preparing methyl tetrahydrophthalic anhydride and synthesis system
  • Method for preparing methyl tetrahydrophthalic anhydride and synthesis system

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preparation example Construction

[0070] Examples of Preparation of Raw Materials and / or Intermediates

[0071] Raw material 1: Petroleum fraction C5 (from Sinopec Shanghai Petrochemical Co., Ltd.), including isoprene and piperylene.

[0072] Isoprene, chemical name: 2-methyl-1,3-butadiene

[0073] Molecular formula: C 5 h 8

[0074] Quality Standard: Chemical Research Institute of Sinopec Shanghai Petrochemical Co., Ltd.

[0075] Standard number: Industrial isoprene SH / T 1781-2016

[0076] Piperylene, chemical name: 1,3-pentadiene or pentadiene

[0077] Molecular formula: C 5 h 8

[0078] Quality Standard: Chemical Research Institute of Sinopec Shanghai Petrochemical Co., Ltd.

[0079] Standard number: Industrial piperylene SH / T 1791-2015

[0080] Raw material 2: maleic anhydride (from Ningbo Zhetie Jiangning Chemical Co., Ltd.), maleic anhydride for short.

[0081] Molecular formula: C4H2O3

[0082] Structural formula:

[0083] Properties: white massive or flaky crystals. Has a pungent odor. ...

Embodiment 1

[0088] refer to figure 1 , a synthesis system for preparing methyltetrahydrophthalic anhydride, comprising a maleic anhydride pre-treatment device 100, the maleic anhydride pre-treatment device 100 includes a maleic anhydride metering tank 1, and the top of the maleic anhydride metering tank 1 is communicated with a device placed on the ground The maleic anhydride storage tank 11, the maleic anhydride stored in the maleic anhydride storage tank 11 has been heated and melted to become a liquid, and is transported to the maleic anhydride metering tank 1 through a chemical pump, and is connected with the maleic anhydride storage tank 11 and the maleic anhydride metering tank 1 The flow meter on the tube is used to accurately measure the amount of maleic anhydride required. The top of the maleic anhydride metering tank 1 is connected with a nitrogen tank 12. After the maleic anhydride metering tank 1 is pumped into the maleic anhydride, the nitrogen in the nitrogen tank 12 is pass...

Embodiment 2

[0096] A kind of method for preparing methyltetrahydrophthalic anhydride disclosed by the invention, the specific operation steps are as follows:

[0097] Step 1: raw material pretreatment;

[0098] Step 1.1: For the pretreatment of maleic anhydride, use the flow meter installed on the connecting pipe between the maleic anhydride storage tank 11 and the maleic anhydride metering tank 1 to accurately measure the required maleic anhydride, and transport the maleic anhydride with the correct measurement through the chemical pump In the maleic anhydride metering tank 1; the nitrogen in the nitrogen gas tank 12 is continuously passed into the maleic anhydride metering tank 1, and the air inside the maleic anhydride metering tank 1 is driven out; steam is passed into the first coil 10 to heat the maleic anhydride , so that the temperature of maleic anhydride is controlled at 55°C, P=100Kpa, and kept warm for later use;

[0099] Step 1.2: pretreatment of petroleum fraction C5, step ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/89
CPCC07D307/89
Inventor 储家逸
Owner 嘉兴南洋万事兴化工有限公司
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