Method for efficiently producing dipropylene glycol dibenzoate

A technology of dipropylene glycol dibenzoate and dipropylene glycol, which is applied in the chemical field, can solve the problems of insufficient production and research of plasticizers, poor production efficiency and quality, etc., achieve good viscosity response, extremely stable, improve efficiency, and better compatibility effect

Inactive Publication Date: 2014-04-23
广州正道环保新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, the production and research on plasticizer (DPDB) at home and abroad a

Method used

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  • Method for efficiently producing dipropylene glycol dibenzoate

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Embodiment example

[0021] In the reactor, drop into 3.84 tons of benzoic acid, 1.77 tons of dipropylene glycol, and 14 kg of catalyst tin protochloride. Heat the heat conduction oil on the heat conduction pipe, and when it is determined that the benzoic acid is completely dissolved, the propeller of the reaction kettle starts to stir. When the temperature is heated to 180°C, water and sublimated benzoic acid will evaporate. When very little water flows out, the temperature rises rapidly to 230°C. At this point, the reaction was substantially complete, and the heating was stopped. Use cooling heat conduction oil to pass through the heat conduction tube to cool the reaction materials. When the temperature in the reactor drops to 100°C, it is drawn out from the bottom of the reactor through the pipeline and sent to the neutralization tank. Neutralize unreacted benzoic acid with 5% NaOH aqueous solution at 70°C and adjust to pH=8. After the reactants are separated, the crude product in the lower ...

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Abstract

The invention relates to a method for efficiently producing dipropylene glycol dibenzoate. The method comprises the process flows of weighing benzoic acid and dipropylene glycol proportionally, and adding benzoic acid and dipropylene glycol as well as a catalyst sodium bisulfate into a reaction kettle for esterification; then, pumping to another neutralization kettle, adding a NaOH aqueous solution to neutralize, washing with water after layering, decoloring after layering, washing with water, drying, filtrating, and then, inspecting, thereby obtaining a finished product. According to the method, 4.5t of high-quality plasticizer or named DPDB can be produced in a reaction kettle with the volume of 5.5 cubic meters in a manner of taking stannous chloride as a catalyst.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a method for efficiently producing dipropylene glycol dibenzoate. Background technique [0002] Plasticizers in my country have a wide range of uses and a large output. Nearly 80% of the 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 phthalate plasticizers cannot be used in products related to food, medicine, toys, etc. [0003] DPDB is a new non-toxic plasticizer developed and produced in my country this year. The raw materials are benzoic acid and dipropylene glycol. It has excellent compatibility with most emulsions, especially VAE and PVAC, and can provide good viscosity response and stability. It can lower the glass transition temperature of the resin. The compatibility between DPDB and P...

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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