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Novel synthetic process of tris (2-propylheptyl) trimellitate

A technology of trimellitic acid tris and trimellitic anhydride, which is applied in the field of organic chemical synthesis and the synthesis of plasticizer trimellitic acid triester, and can solve the index of trimellitic acid tris(2-propylheptyl)ester The color number and resistivity are difficult to reach high-grade products, etc., to achieve the effects of reducing energy consumption, speeding up the reaction speed, and increasing the washing temperature

Inactive Publication Date: 2014-04-02
ZHEJIANG HAILIYE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional production process, the target color number and resistivity of the produced tris(2-propylheptyl) trimellitate are difficult to reach high-grade products. Therefore, it is necessary to optimize the existing production process to obtain better grade product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Get 1920 kilograms of trimellitic anhydride, 3248 kilograms of heptanol, and 17.1 kilograms of isopropyl titanate for subsequent use; earlier, 1920 kilograms of trimellitic anhydride, 2900 kilograms of heptanol, and 13.7 kilograms of isopropyl titanate are put into the reaction kettle, and the temperature rises. React at 180-190°C; after 2 hours of reaction, continue to heat up to 210°C, add the remaining 348 kg of heptanol and 3.4 kg of isopropyl titanate until the end of the reaction; add 52 kg of activated carbon and 51.9 kg of hydrogen peroxide was decolorized, and the crude product was obtained after decolorization; the crude product was neutralized and washed, and the temperature of the washing was controlled at 105° C., dealcoholized after washing, and filtered to obtain the finished product tris(2-propylheptyl) trimellitate.

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PUM

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Abstract

The invention discloses a novel synthetic process of tris (2-propylheptyl) trimellitate. The process comprises the following steps: (1) taking raw materials according to a molar ratio of trimellitic anhydride to heptanol being 1:2.7-2.9, and taking a catalyst isopropyl titanate accounting for 0.3-0.35% of the total weight of trimellitic anhydride and heptanol; (2) taking raw materials according to a molar ratio of trimellitic anhydride to heptanol being 1:2.5-2.6, adding 80% of the catalyst into the reactor and heating for reaction; (3) continuing to heat the reaction materials to 200-220 DEG C, and adding the remaining heptanol and the catalyst isopropyl titanate into the reaction kettle for reaction; (4) decolorizing the reaction materials to obtain a crude product, and adding hydrogen peroxide accounting for 1-1.2 wt% of the whole reaction system in the decolorization process; and (5) conducting neutralization washing on the crude product with neutralization washing temperature at 105-110 DEG C, dealcoholizing and filtering to obtain a finished product of tris (2-propylheptyl) trimellitate. The process provided by the invention not only can reduce the production energy consumption but also can improve the color and grade of the finished product.

Description

technical field [0001] The invention belongs to the field of organic chemical synthesis, in particular to the field of synthesis of a plasticizer tris(2-propylheptyl) trimellitate. Background technique: [0002] Tris(2-propylheptyl) trimellitate is an industrial plasticizer which has the advantages of polyester plasticizer and monomeric plasticizer. It has good plasticizing performance, migration resistance, water extraction resistance and thermal stability, and can be used as a heat-resistant and durable material for various resins such as polyvinyl chloride, vinyl chloride copolymer, nitrocellulose, and ethyl cellulose. Non-toxic plasticizer, especially suitable for products that require heat resistance and durability, such as heat-resistant cable materials, plates, sheets, and gaskets. [0003] In the traditional production process, the target color number and resistivity of the produced tris(2-propylheptyl) trimellitate are difficult to reach high-grade products. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/76C07C67/08
CPCC07C67/08
Inventor 张桂琴刘雪强周旭楚姚文超
Owner ZHEJIANG HAILIYE TECH
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