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Preparation method of environment-friendly plasticizer dioctyl terephthalate

A technology of dioctyl phthalate and terephthalic acid, which is applied in the field of preparation of environmentally friendly plasticizer dioctyl terephthalate, can solve the problems of long production process and high energy consumption, and achieve the catalyst dosage Less, high esterification conversion rate, mild reaction effect

Inactive Publication Date: 2018-07-27
YIXING YANGYANG PLASTIC ADDITIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly aims at defects such as long time-consuming production process and high energy consumption in the prior art, and provides a new production process and new method for the synthesis of environmentally friendly dioctyl terephthalate, so that during production, A preparation method that achieves sufficient reaction, short esterification time, low production energy consumption, and stable product quality

Method used

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  • Preparation method of environment-friendly plasticizer dioctyl terephthalate
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  • Preparation method of environment-friendly plasticizer dioctyl terephthalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Esterification reaction

[0027] Put 2500kg of raw material isooctyl alcohol into a 4000L stainless steel kettle with stirring and pressure resistance, start stirring and heat up to 165-175°C to remove the moisture contained in the material.

[0028] In a 5000L stainless steel esterification reaction kettle with stirring and pressure resistance, 875kg of preheated isooctyl alcohol is put into it at one time, the stirring is started, and then 1000kg of terephthalic acid is put into it, and the lid of the kettle is closed.

[0029] Turn on the steam to heat up the temperature, and at the same time, pass a small amount of nitrogen into the material in the tank from the bottom of the esterification reaction tank for bubbling to prevent the material from settling. , when the temperature in the kettle is 200-220°C and the pressure is 0.01-0.03MPa, start to drop the remaining 1625kg of isooctyl alcohol in the preheating kettle, and the time to complete the dropwise addition...

Embodiment 2

[0036] 1. Esterification reaction

[0037] Put 2,800kg of raw material isooctyl alcohol into a stirred, pressure-resistant 4,000L stainless steel kettle, start stirring and heat up to 165-175°C to remove the moisture contained in the material.

[0038] Put 980kg of preheated isooctyl alcohol into a 5000L stainless steel esterification reaction kettle with stirring and pressure resistance at one time, start stirring, then put in 1000kg of terephthalic acid, and close the lid of the kettle.

[0039]Turn on the steam to heat up the temperature, and at the same time, pass a small amount of nitrogen into the material in the tank from the bottom of the esterification reactor for bubbling to prevent the material from settling. , when the temperature in the kettle is 200-220°C and the pressure is 0.01-0.03MPa, start to add dropwise the remaining 1820kg of isooctyl alcohol in the preheating kettle, and the time to complete the dropwise addition is 1.1h. After the dropwise addition of i...

Embodiment 3

[0046] 1. Esterification reaction

[0047] Put 3,200kg of raw material isooctyl alcohol into a stirred, pressure-resistant 4,000L stainless steel kettle, start stirring and heat up to 165-175°C to remove the moisture contained in the material.

[0048] 1120kg of preheated isooctyl alcohol is put into a 5000L stainless steel esterification reaction kettle with stirring and pressure resistance at one time, the stirring is started, and then 1000kg of terephthalic acid is put into it, and the lid of the kettle is closed.

[0049] Turn on the steam to heat up the temperature, and at the same time, pass a small amount of nitrogen into the material in the tank from the bottom of the esterification reaction tank for bubbling to prevent the material from settling. , when the temperature in the kettle is 200-220°C and the pressure is 0.01-0.03MPa, start to add dropwise the remaining 2082kg of isooctyl alcohol in the preheating kettle, and the time to complete the dropwise addition is 1....

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Abstract

The invention belongs to the field of chemical industry, particularly relates to a production and synthesis technology of a plasticizer, and provides a preparation method of an environment-friendly plasticizer dioctyl terephthalate for the plasticizer industry . According to the preparation method of the environment-friendly plasticizer dioctyl terephthalate, terephthalic acid and isooctanol are used as main raw materials and are continuously fed into a reactor in the presence of a composite esterification catalyst for esterification reaction after being heated in a pre-heating kettle, and byadjustment of reaction pressure in the earlier and later periods in an esterification kettle, reaction rate is increased, reaction time is shortened, energy is saved, and energy consumption is reduced; a small amount of nitrogen is introduced in the esterification reaction process, and material settling can be prevented, so that materials are fully reacted. The preparation method comprises the specific operation process as follows: preheating of raw materials, esterification reaction, negative-pressure dealcoholization, alkali addition for neutralization, water washing, steam stripping, adsorption and decoloration and filtration. Meanwhile, the production and synthesis technology, particularly the new process adopting the composite catalyst has the advantages of being high in esterification conversion rate, low in catalyst consumption and recyclable.

Description

technical field [0001] The invention belongs to the field of chemical industry, specifically relates to the production technology of plasticizers, mainly aims at the plasticizer industry, and provides a preparation method of an environment-friendly plasticizer dioctyl terephthalate. Background technique [0002] Plasticizer is a substance added to increase the plasticity, fluidity and flexibility of the finished product when processing high polymers such as rubber, plastics, and coatings. The world's largest producer and consumer country. Dioctyl terephthalate is a plasticizer with excellent performance. It is a non-toxic, green and environmentally friendly non-phthalic plasticizer. It has good cold resistance, heat resistance, extraction resistance, electrical insulation, and low temperature softness. At the same time, it has low volatility and high plasticizing efficiency. As the main plasticizer, dioctyl terephthalate can replace dioctyl phthalate. It is widely used as ...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/82
CPCC07C67/08C07C69/82Y02P20/584
Inventor 杭春涛杨健
Owner YIXING YANGYANG PLASTIC ADDITIVE
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