Dibutyl Sebacate CAS 109-43-3

The dosage of catalyst is 0.3%, the temperature is 130-140°C, the esterification is about 4-6 hours under normal pressure, and 0.1-0.3% activated carbon is added during esterification. The crude ester obtained is neutralized, dealcoholized and filtered to obtain the finished product. The raw material sebacic acid is prepared from castor oil. Raw material consumption (kg/t) sebacic acid 665 butanol 525
Refining method: vacuum distillation and refining.

In a 100mL three-necked flask equipped with a thermometer, reflux condenser and water separator, add a certain amount of sebacic acid, n-butanol and a small amount of catalyst, and use benzene as the water-carrying agent. After heating, dissolving and stirring, take a sample Determine its acid value. Heat and reflux to separate the water until almost no water comes out. After cooling slightly, take a sample to measure its acid value. After the reaction is completed, the reaction liquid is poured out. The catalyst is insoluble in the reaction liquid and remains in the reaction bottle for reuse. The reaction solution was washed with water, dilute Na2CO3 solution, and water respectively, and then dried with MgSO4. First, steam out the unreacted n-butanol and benzene under normal pressure, and then distill under reduced pressure to collect the fraction at 168~171℃/400Pa, which is the product. Copper sulfate is used as the esterification reaction catalyst. The reaction conditions are: 0.05 mol sebacic acid, the catalyst dosage is 3.0g, the amount ratio of alkyd substances is 4, the reaction time is 3.0h, the water-containing agent is 12mL, the ester of sebacic acid The conversion rate can reach 97.23%.

In a four-necked flask equipped with a water separator, a thermometer and a reflux condenser, add a certain amount of sebacic acid, n-butanol and ferric ammonium sulfate dodecahydrate. After heating, dissolving and stirring, take a sample to measure its acid value. Then heat and reflux to separate the water until almost no reflux water comes out. After cooling slightly, take a sample to measure its acid value. Use the GB1668-81 method to measure the change in acid value before and after the reaction, and calculate the esterification rate. After the reaction is completed, the reaction solution is neutralized to weak acidity, and then washed with water, 10% sodium carbonate aqueous solution, and water respectively; distilled, n-butanol is first evaporated under normal pressure, and then distilled under reduced pressure to collect the n-butanol at 172~175°C/400Pa. The fraction is the product.