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Method for efficiently producing diethylene glycol dibenzoate

A technology of diethylene glycol dibenzoate and benzoic acid, which is applied in the chemical field, can solve the problems of production efficiency and quality, insufficient production and research of plasticizers, etc., and achieve low price, good compatibility, The effect of improving efficiency

Active Publication Date: 2014-06-11
广州正道环保新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, at present, the production and research on plasticizer (DEDB) at home and abroad are not enough, and the production efficiency and quality are far from each other.

Method used

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  • Method for efficiently producing diethylene glycol dibenzoate
  • Method for efficiently producing diethylene glycol dibenzoate

Examples

Experimental program
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Embodiment example

[0041] Put 3.87 tons of benzoic acid, 1.6 tons of diethylene glycol, and 16 kg of sodium bisulfate as a catalyst in the reactor. Heat the heat transfer oil through the heat transfer tube. When it is determined that all the benzoic acid is dissolved, start stirring. When the temperature is heated to 180°C, benzoic acid with water and sublimation will distill out. When there is little water flowing out, the temperature quickly rises to 200°C. At this time, it can be considered that the reaction is basically completed, and the heating is stopped. Use cooling heat transfer oil to pass into the heat transfer pipe to cool the reaction material. When the temperature in the reaction kettle drops to 100°C, it is drawn from the bottom of the reaction kettle through a pipeline and sent to the neutralization kettle. Neutralize the unreacted benzoic acid with 5% NaOH aqueous solution at 70°C and adjust to PH=8. After the reactants are stratified, the crude product in the lower layer is p...

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PUM

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Abstract

The invention discloses a method for efficiently producing diethylene glycol dibenzoate. Process flow of the method is as follows: weighing benzoic acid and diglycol, as well as a catalyst sodium hydrogen sulfate in proportion, and adding into a reaction kettle to carry out alcoholization; pumping into a neutralizing kettle, adding NaOH aqueous liquor for neutralizing, washing with water after layering, discoloring after layering, and then washing with water, drying, filtering and inspecting to obtain finished products. The invention discloses a method for producing a 4.5-tonnage high-quality plasticizer or DEDB (Diethylene Glycol Dibenzoate) in a reaction kettle with capacity of 5.5 cubic meters by taking sodium hydrogen sulfate as the catalyst.

Description

Technical field [0001] The invention relates to the field of chemistry, in particular to a method for efficiently producing diethylene glycol dibenzoate. Background technique [0002] my country's plasticizers are widely used and have a large output. Nearly 80% of plasticizers are phthalates, such as DOP and DBP. Since DOP was suspected of being carcinogenic by the National Cancer Institute (NCI), countries such as Europe and the United States began to restrict its use. my country also stipulates that all products related to food, medicine, toys, etc. cannot use phthalate plasticizers. [0003] DEDB is a new non-toxic plasticizer developed and produced in my country this year. The raw materials for production are benzoic acid and diethylene glycol, which are cheaper than DOP raw materials. [0004] It has excellent compatibility with most emulsions, especially VAE and PVAC, and can provide good viscosity response and stability. It can reduce the glass transition temperature of the...

Claims

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Application Information

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IPC IPC(8): C07C69/78C07C67/08
CPCC07C67/08C07C69/78
Inventor 叶大铿陈路生胡海思
Owner 广州正道环保新材料有限公司
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