Preparation method of triethylene glycol di-2-ethylhexoate
A technology of isooctanoate and triethylene glycol diethylene glycol is applied in the field of plasticizers to achieve the effects of inhibiting side reactions, simple methods, and improving product quality
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Embodiment 1
[0017] Take a 500ml four-neck flask, equipped with mechanical stirring, oil bath heating device, install a condenser, a distillation head, and a thermometer, add 75g of triethylene glycol, 225g of isooctanoic acid, and 0.5g of activated clay, heat and stir, when the temperature rises to 40 ° C ~ 80 °C, add 1.5 g of catalyst and stir for 2 hours.
[0018] Continue to raise the temperature, control the temperature at 80°C-90°C, dehydrate under negative pressure, control the vacuum degree at 10mmHg-15mmHg, and react for 6 hours to obtain the esterification mixture;
[0019] The above-prepared esterification mixture was lowered to room temperature, and 100 g of 1.0% sodium hydroxide aqueous solution was added dropwise within 1 hour, and 5.0 g of decolorizing agent (activated carbon) was added. Distill under the condition of 1mmHg to remove excess isooctanoic acid, and then filter to obtain triethylene glycol diisocaprylate.
Embodiment 2
[0021] Take a 1000ml four-neck flask, equipped with mechanical stirring, oil bath heating device, install a condenser, distillation head, thermometer, add 75g triethylene glycol, 200g isooctanoic acid, 0.5g activated carbon, heat and stir, when the temperature rises to 40 ℃ ~ 80 ℃ When, add 1.5g catalyst, stir 2 hours.
[0022] Continue to raise the temperature, control the temperature at 90°C to 105°C, dehydrate under negative pressure, control the vacuum at 10mmHg to 15mmHg, and react for 4.5 hours to obtain an esterification mixture;
[0023] The esterification mixture prepared above was lowered to room temperature, and 100 g of 1.2% sodium hydroxide aqueous solution was added dropwise within 1 hour, and 4.5 g of decolorizing agent (activated carbon) was added. Distill under the condition of 1mmHg to remove excess isooctanoic acid, and then filter to obtain triethylene glycol diisocaprylate.
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