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
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[0025] Example 1
[0026] 1. Esterification reaction
[0027] Put 2500kg of raw material isooctyl alcohol into a 4000L stainless steel kettle with stirring and pressure resistance, turn on the stirring and heat up to 165-175°C to remove the water contained in the material.
[0028] Put preheated 875kg of isooctyl alcohol into a 5000L stainless steel esterification reactor with stirring and pressure resistance, turn on the stirring, then put in 1000kg terephthalic acid, and close the lid.
[0029] Turn on the steam to heat up, and at the same time pass a small amount of nitrogen from the bottom of the esterification reaction kettle into the materials in the kettle for bubbling to prevent the materials from settling. When the temperature in the kettle reaches 170~180°C, put in 3.85kg of esterification catalyst and continue to heat up , When the temperature in the kettle is 200~220℃ and the pressure is 0.01~0.03MPa, the remaining 1625kg of isooctyl alcohol in the preheated kettle will be...
Example Embodiment
[0035] Example 2
[0036] 1. Esterification reaction
[0037] Put 2800kg of raw material isooctyl alcohol into a 4000L stainless steel kettle with stirring and pressure resistance, turn on the stirring and heat up to 165-175°C to remove the water contained in the material.
[0038] Put preheated 980kg of isooctyl alcohol into a 5000L stainless steel esterification reactor with stirring and pressure resistance, turn on the stirring, then put in 1000kg terephthalic acid, and close the lid.
[0039] Turn on the steam to heat up, and at the same time pass a small amount of nitrogen from the bottom of the esterification reaction kettle into the materials in the kettle for bubbling to prevent the materials from settling. When the temperature in the kettle reaches 170-180°C, add 4.56kg of esterification catalyst and continue to heat up. When the temperature in the kettle is 200-220℃ and the pressure is 0.01-0.03MPa, the 1820kg isooctyl alcohol remaining in the preheated kettle will be added ...
Example Embodiment
[0045] Example 3
[0046] 1. Esterification reaction
[0047] Put 3200kg of raw material isooctyl alcohol into a 4000L stainless steel kettle with stirring and pressure resistance, turn on the stirring and heat up to 165-175°C to remove the water contained in the material.
[0048] Put preheated 1120kg of isooctyl alcohol into a 5000L stainless steel esterification reactor with stirring and pressure resistance, turn on the stirring, then put in 1000kg terephthalic acid, and close the lid.
[0049] Turn on the steam to heat up, and at the same time pour a small amount of nitrogen from the bottom of the esterification reaction kettle into the materials in the kettle for bubbling to prevent the materials from settling. When the temperature in the kettle reaches 170-180°C, put in 4.83kg of esterification catalyst and continue to heat up. When the temperature in the kettle is 200-220℃ and the pressure is 0.01-0.03MPa, the remaining 2082kg of isooctyl alcohol in the preheated kettle will be...
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