Preparation method of diethylene glycol dibenzoate

A technology of diethylene glycol dibenzoate and monobenzoate is applied in the field of production and preparation of diethylene glycol dibenzoate, and can solve the problems of toluene environmental pollution, potential safety hazards, complicated production process, and the like, Achieve the effect of good pollution resistance, low cost, safe and stable process operation

Inactive Publication Date: 2012-12-12
PLASTIC LIGHT CHEM IND LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of this production method is complex, and sulfuric acid has a certain corrosive effect on the equipment. In addition, toluene, as a water-carrying agen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the reactor, according to the total weight of raw materials, add 66.5 parts of benzoic acid and 33.5 parts of diethylene glycol, and heat up (hot oil temperature 220 ° C); during the heating process, benzoic acid begins to dissolve; after the benzoic acid is completely dissolved , the stirrer works, and 0.05 parts of composite catalyst are added; continue to heat up, the temperature reaches 190 ° C, and keep it warm for 4 hours to make the reaction complete; Formate: add 0.1 part of diatomaceous earth and 0.1 part of activated carbon, decolorize and filter to obtain the finished product of diethylene glycol dibenzoate.

Embodiment 2

[0019] In the reaction kettle, according to the total weight of raw materials, add 68.5 parts of benzoic acid and 31.5 parts of diethylene glycol, and heat up (hot oil temperature 250 ° C); during the heating process, benzoic acid begins to dissolve; after the benzoic acid is completely dissolved , the stirrer works, and 0.08 parts of composite catalyst are added; continue to heat up, the temperature reaches 210°C, and keep warm for 6 hours to make the reaction complete; Formate: add 0.15 parts of diatomaceous earth and 0.15 parts of activated carbon, decolorize and filter to obtain the finished product of diethylene glycol dibenzoate.

Embodiment 3

[0021] In the reactor, according to the total weight of raw materials, add 67 parts of benzoic acid and 33 parts of diethylene glycol, and heat up (hot oil temperature 240°C); during the heating process, benzoic acid begins to dissolve; after the benzoic acid is completely dissolved , the stirrer works, and 0.06 parts of composite catalyst are added; continue to heat up, the temperature reaches 200 ° C, and keep it warm for 5 hours to make the reaction complete; Formate: add 0.12 parts of diatomaceous earth and 0.12 parts of activated carbon, decolorize and filter to obtain the finished product of diethylene glycol dibenzoate.

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PUM

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Abstract

The invention discloses a preparation method of diethylene glycol dibenzoate. Benzoic acid and diethylene glycol are used as raw materials, and a composite catalyst employed is a mixture of tetraisopropyl titanate and a solid titanium base compound. The method comprises steps of: adding by weight 66.5-68.5 parts of benzoic acid and 31.5-33.5 parts of diethylene glycol in a reaction kettle; heating; after complete dissolving of benzoic acid, adding 0.05-0.08 part of the composite catalyst; insulating at a temperature of 190-210 DEG C for 4-6 h to achieve complete reaction; after the reaction, removing alcohol by reducing temperature and pressure to obtain crude diethylene glycol dibenzoate; adding 0.1-0.15 part of diatomite and 0.1-0.15 part of activated carbon; and decolorizing and filtering to obtain the diethylene glycol dibenzoate finished product. The preparation method provided by the invention has characteristics of safe and stable technical operation, low cost, no environmental pollution, short reaction time and high yield of finished product.

Description

technical field [0001] The invention relates to a production and preparation method of a plasticizer, in particular to a production and preparation method of diethylene glycol dibenzoate. Background technique [0002] At present, the traditional production method of diethylene glycol dibenzoate is to take benzoic acid and diethylene glycol as the main raw materials, wherein the benzoic acid needs to be excessive, the concentrated sulfuric acid is used as the catalyst, and a certain amount of toluene is added as the water-carrying agent. Reaction at low temperature, then neutralization, water washing, solvent removal, decolorization, and finally the product is obtained by filtration. The production process of this production method is complex, and sulfuric acid has a certain corrosive effect on the equipment. In addition, toluene, as a water-carrying agent, has potential safety hazards in operation because of its flammable and explosive characteristics, and improper ha...

Claims

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Application Information

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IPC IPC(8): C07C69/78C07C67/08
Inventor 宋庆余
Owner PLASTIC LIGHT CHEM IND LIMITED
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