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Method for preparing environment-friendly plasticizer cyclohexane-1, 2-dicarboxylic acid diethylhexyl ester

A technology of diisooctyl dicarboxylate and environmentally friendly plasticizer, which is applied in the field of chemical engineering, can solve the problems of hygienic performance, non-toxicity and difficulty in meeting environmental protection requirements, and achieve excellent performance, low mobility, and extended service life Effect

Inactive Publication Date: 2009-12-30
ZHEJIANG SHANGTONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main plasticizers produced by domestic enterprises are difficult to meet the requirements of environmental protection in terms of many properties, especially hygiene and non-toxicity.

Method used

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  • Method for preparing environment-friendly plasticizer cyclohexane-1, 2-dicarboxylic acid diethylhexyl ester
  • Method for preparing environment-friendly plasticizer cyclohexane-1, 2-dicarboxylic acid diethylhexyl ester

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Effect test

Embodiment 1

[0016] Cyclohexane-1,2-dicarboxylic anhydride and 2-ethylhexanol molar ratio is 1 / 2.4, total mass is 4720kg cyclohexane-1,2-dicarboxylic anhydride and 2-ethylhexanol are added Heat in the reactor, then add 0.2% tetraisopropyl titanate catalyst relative to the mass of cyclohexane-1,2-dicarboxylic acid anhydride, heat, heat up from 185°C to 220°C, react for 4 hours, dealcoholize, and cool to 85°C Add 80kg of 1.0wt% NaOH aqueous solution at ~90°C to neutralize, wash with water at 90°C to 95°C, and then use steam stripping to refine for 4 hours, add 0.1% of the total amount of active carbon in the kettle to absorb and decolorize for 20 minutes, and press filter to obtain cyclohexane - Diisooctyl 1,2-dicarboxylate, the yield is 97.1%, and the purity is 99.0%.

Embodiment 2

[0018] Cyclohexane-1,2-dicarboxylic acid anhydride and 2-ethylhexanol molar ratio is 1 / 2.5, total mass is 4720kg cyclohexane-1,2-dicarboxylic anhydride and 2-ethylhexanol are added Heating in the reactor, then adding 0.2% tetraisopropyl titanate catalyst relative to the mass of cyclohexane-1,2-dicarboxylic acid anhydride, heating, raising the temperature from 185°C to 220°C for 3.8h, dealcoholization, cooling to 85 Add 75kg of 1.0wt% NaOH aqueous solution at ℃~90℃ for neutralization, wash with water at 90℃~95℃, then steam strip and refine for 4h, add 0.1% activated carbon of the total amount of the kettle material to absorb and decolorize for 20min, and press filter to obtain cyclohexane Diisooctyl alkane-1,2-dicarboxylate has a yield of 98.3% and a purity of 99.1%.

Embodiment 3

[0020] Cyclohexane-1,2-dicarboxylic anhydride and 2-ethylhexanol molar ratio is 1 / 2.6, total mass is 4720kg cyclohexane-1,2-dicarboxylic anhydride and 2-ethylhexanol are added Heating in the reactor, then adding 0.2% tetraisopropyl titanate catalyst relative to the mass of cyclohexane-1,2-dicarboxylic acid anhydride, heating, raising the temperature from 185°C to 220°C for 3.5h, dealcoholization, cooling to 85 Add 75kg of 1.0wt% NaOH aqueous solution at ℃~90℃ for neutralization, wash with water at 90℃~95℃, then steam strip and refine for 4h, add 0.1% activated carbon of the total amount of the kettle material to absorb and decolorize for 20min, and press filter to obtain cyclohexane Diisooctyl alkane-1,2-dicarboxylate has a yield of 98.2% and a purity of 99.0%.

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Abstract

The invention discloses a method for preparing environment-friendly plasticizer cyclohexane-1, 2-dicarboxylic acid diethylhexyl ester. The method comprises the steps: 1) 1 mole of cyclohexane-1, 2-dicarboxylic acid ahhydride, 2.4-2.6 mole of 2-ethylhexanol and catalyst are mixed together and then heated; the temperature is raised to 220 DEG C from 185 DEG C, and the reaction is carried out for 3-4h; crude product of the cyclohexane-1, 2-dicarboxylic acid diethylhexyl ester is obtained after dealcoholization; 2) the obtained crude product of the cyclohexane-1, 2-dicarboxylic acid diethylhexyl ester is cooled and added with NaOH water solution to be neutralized; after being washed and processed by steam stripping, the reaction product is refined for 3-4h and added with active carbon having the quantity being 0.1-0.2% of the total quantity of the materials for adsorption and decoloration, and purified product can be obtained after filter pressing. The product is a non-phthalate esters environment-friendly plasticizer which is suitable for sensitive application of PVC, has high safety, and is used for low peculiar smell automobile cables, automobile internal decorating parts, medical equipment such as a medical nutrition supply pipe and the like, food touching products such as domestic food touching gloves, refreshing films, food suction tubes and the like, environment-friendly indoor wallpaper, decorative sheet, toys for children, etc.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a preparation method of an environmentally friendly plasticizer cyclohexane-1,2-diisooctyl dicarboxylate. Background technique [0002] Plasticizers are the most widely used additives in the plastics industry, and play a decisive role in promoting the development of the plastics industry, especially the polyvinyl chloride (PVC) industry. At present, various new plastics have penetrated into various fields such as industry and agriculture, transportation, transportation, medicine, food, clothing, construction, and national defense. With the improvement of environmental protection awareness in various countries around the world, plastic products such as medical packages, medical devices, food packaging, daily necessities, and toy processing have put forward higher hygiene requirements for the main plasticizer. Applied research on required plastic products. However, t...

Claims

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Application Information

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IPC IPC(8): C07C69/75C07C67/08C07C67/48C08K5/12
Inventor 商集平周少杰方猷泉
Owner ZHEJIANG SHANGTONG TECH
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