Preparation of oleic acid trimethylolpropane easter

Oleic acid trimethylolpropane easter with the property of lubrication is synthesized from esterification of oleic acid and trimethylolpropane as the raw material under reduced pressure with p-toluenesulfonic acid(PTSA) as catalyst.Through comparing esterification rate and product colour,the effect factors on the reaction are discussed: amount of catalyst,reaction time and reaction temperature.The optimum conditions are found as follows: amount of PTSA is 1%(mass fraction) based upon mass of total material,the reaction temperature is 150 ℃,n(oleic acid)/n(trimethylolpropane)is 3.0∶1,reaction time is 3 h.Under the optimum conditions,esterification rate of repeated experiment is all above 95% and the product yield is all above 90%.