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Production technique of diethylene glycol dibenzoate

A diethylene glycol dibenzoate and production process technology, applied in the production process field of plasticizer diethylene glycol dibenzoate, can solve the problems of no fluidity, inability to use directly, poor cold resistance, etc., and achieve Increase whiteness, reduce cost and freezing point, wide application effect

Inactive Publication Date: 2013-04-03
CENXI XIANGSHENG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diethylene glycol dibenzoate produced by this technical solution is generally a light yellow oily liquid with a darker color and a freezing point of about 20°C. It will crystallize below 20°C and has no fluidity. It is used in plastics Poor cold resistance, can not be used directly, the scope of application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] at 6m 3 3000Kg of benzoic acid, 1500Kg of diethylene glycol, and 28Kg of tin oxide were put into a reaction kettle, stirred and heated, and kept at 190-210°C for 6 hours to obtain the crude product, and the crude product was added with a concentration of 150 kg of 35% hydrogen peroxide aqueous solution for oxidation. Then add alkali to neutralize, add water to wash, add 4Kg gac to carry out decolorization in the steam stripping process, add 400kg palm oil and mix uniformly, finally obtain 4000kg light-colored product by pressure filtration, the freezing point of gained product is 10 ℃.

Embodiment 2

[0017] Put 3000Kg of benzoic acid, 1200Kg of diethylene glycol, and 21Kg of tin oxide into a 6m3 reactor, stir and heat up, and keep warm at 190-210°C for 7 hours to obtain a crude product. Add 210kg of 35% hydrogen peroxide aqueous solution to the crude product for oxidation. Then add alkali to neutralize, add water and wash, add 3.36Kg of gac to carry out decolorization in the stripping process, add 495kg of palm oil and mix evenly, finally obtain 3300kg of light-colored products by pressure filtration, and the freezing point of the gained products is 10 ℃.

Embodiment 3

[0019] Put 3000Kg of benzoic acid, 1667Kg of diethylene glycol, and 37.35Kg of tin oxide into a 6m3 reactor, stir and heat up, and keep the temperature at 190-210°C for 8 hours to obtain the crude product, and add 93.34kg of 50% hydrogen peroxide aqueous solution to the crude product to carry out Oxidation, then add alkali to neutralize, add water to wash, add 4.67Kg of activated carbon to decolorize during the stripping process, add 1260kg of palm oil to mix evenly, and press filter to finally obtain 4200kg of light-colored product, the freezing point of the obtained product is 10 °C.

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Abstract

The invention discloses a production technique of diethylene glycol dibenzoate, which comprises the following steps: putting benzoic acid, diethylene glycol and catalyst into a reactor to carry out esterification reaction, neutralizing the synthesized crude product, washing with water, stripping, decolorizing, and carrying out pressure filtration to obtain the finished product. The invention is characterized in that a vegetable oil plasticizer, which accounts for 10-30% of the finished product, is added to the decolorization product, and after the vegetable oil plasticizer and the decolorization product are evenly mixed, pressure filtration is carried out on the mixture; the weight ratio of the benzoic acid to the diethylene glycol is (1.8-2.5):1; and the catalyst accounts for 0.5-0.8% of the total amount of the benzoic acid and the diethylene glycol. Compared with the prior art, the invention lowers the production cost and reduces the environmental pollution; and oxidation technique and low-cost low-color-number vegetable oil plasticizer are added to the after-treatment process to obtain the light-color low-cost low-freezing-point diethylene glycol dibenzoate, thereby further widening the application range of the product.

Description

technical field [0001] The invention relates to the technical field of production of plastic additives, in particular to a production process of plasticizer diethylene glycol dibenzoate. Background technique [0002] Plasticizers are additives that can increase the flexibility of plastic materials. Dioctyl phthalate (DOP) and dibutyl phthalate (DBP) are the most widely used in the market. DOP, as the main plasticizer, was suspected to be carcinogenic by the National Cancer Institute (NCI), and its use was restricted. Western developed countries such as Europe and the United States have already introduced restrictive measures. In February 2011, the European Union included DOP, DBP, and butyl benzyl phthalate (BBP) in the chemical elimination list. At present, China only stipulates that the total content of the three types of phthalates DOP, DBP and BBP shall not exceed 0.1% in the limit standard for harmful substances in toy coatings. It is reported that my country is form...

Claims

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Application Information

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IPC IPC(8): C07C69/78C07C67/08C07C67/62
Inventor 陈俭文
Owner CENXI XIANGSHENG CHEM CO LTD
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