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Method for producing elasticizer diethylene glycol dibenzoate

A technology of diethylene glycol dibenzoate and production method, which is applied in the production field of plasticizer diethylene glycol dibenzoate, can solve the problems of toluene environmental pollution, complex production process, equipment corrosion, etc., and achieve resistance Good pollution, safe and stable process operation, good light denaturation resistance

Inactive Publication Date: 2009-07-29
无锡双象新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this production method is: the production process is complex, and sulfuric acid has a certain corrosive effect on equipment, in addition, as toluene with water agent, because of its flammable and explosive characteristics, there is a potential safety hazard in operation. For the treatment of toluene Improper will also cause environmental pollution

Method used

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  • Method for producing elasticizer diethylene glycol dibenzoate
  • Method for producing elasticizer diethylene glycol dibenzoate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] at 30m 3 Drop into 13300kg of benzoic acid and 6700kg of diethylene glycol in a stainless steel reactor, and heat up (hot oil temperature 220°C-250°C). All the benzoic acid is dissolved, start the stirring, add the composite catalyst tetraisopropyl titanate and 10kg of solid titanium-based compound, continue to heat up to 190°C-210°C, and keep it warm for 4-6 hours to complete the reaction. Then lower the temperature to 190±2°C, dealcoholize under reduced pressure (vacuum degree≤-0.095Mpa) to obtain crude DEDB. Add 20kg of diatomaceous earth and 25kg of activated carbon, and obtain DEDB through traditional decolorization and filtration methods.

Embodiment 2

[0022] at 30m 3 Drop into 13300kg of benzoic acid and 6700kg of diethylene glycol in a stainless steel reactor, and heat up (hot oil temperature 220°C-250°C). All the benzoic acid is dissolved, start stirring, add the composite catalyst tetraisopropyl titanate and 16 kg of solid titanium-based compound, continue to heat up to 190°C-210°C, and keep it warm for 4-6 hours to complete the reaction. Then lower the temperature to 190±2°C, dealcoholize under reduced pressure (vacuum degree≤-0.095Mpa) to obtain crude DEDB. Add 25kg of diatomaceous earth and 30kg of activated carbon, and obtain DEDB through traditional decolorization and filtration methods.

Embodiment 3

[0024] at 30m 3 Drop into 13400kg of benzoic acid and 6600kg of diethylene glycol in a stainless steel reactor, and heat up (hot oil temperature 220°C-250°C). All the benzoic acid is dissolved, start stirring, add the composite catalyst tetraisopropyl titanate and 14kg of solid titanium-based compound, continue to heat up to 190°C-210°C, and keep the temperature for 4-6 hours to complete the reaction. Then lower the temperature to 190±2°C, dealcoholize under reduced pressure (vacuum degree≤-0.095Mpa) to obtain crude DEDB. Add 20kg of diatomaceous earth and 25kg of activated carbon, and obtain DEDB through traditional decolorization and filtration methods.

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Abstract

The invention relates to a production method of a plasticizing agent, in particular to a production method of the plasticizing agent of DEDB. The invention is achieved as follows: taking acidum benzoicum and diglycol as the raw materials, adding a compound catalyst, adopting a solvent-free method and completing the reaction at a special temperature. The material formula comprises (by weight): the acidum benzoicum: 66.5 to 68.5 percent; the diglycol: 31.5 to 33.5 percent; the compound catalyst: 0.05 to 0.08 percent (by total feed capacity); activated carbon: 0.1 to 0.15 percent (by total feed capacity); and diatomite: 0.1 to 0.15 percent (by total feed capacity). The invention is achieved by taking the acidum benzoicum and the diglycol as the raw materials, adding the compound catalyst, adopting the solvent-free method and completing the reaction at a special temperature, thus shortening the reaction time and increasing the yield rate of finished products.

Description

technical field [0001] The present invention relates to the production method of plasticizer, specifically a kind of production method of plasticizer diethylene glycol dibenzoate. Background technique [0002] The invention is applicable to the production of the synthetic plasticizer diethylene glycol dibenzoate (namely DEDB) with diethylene glycol and benzoic acid as main raw materials. [0003] The traditional production method is to use benzoic acid and diethylene glycol as the main raw materials, of which benzoic acid needs to be excessive, and concentrated sulfuric acid is used as a catalyst, and a certain amount of toluene is added as a water-carrying agent, reacted at a specific temperature, and then neutralized and washed with water , solvent removal, decolorization, and finally the product is obtained by filtration. The defect of this production method is: the production process is complex, and sulfuric acid has a certain corrosive effect on equipment, in addition,...

Claims

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Application Information

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IPC IPC(8): C07C69/78C07C67/08C08K5/103
Inventor 何天华沈伟邹敏
Owner 无锡双象新材料有限公司
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