The production process mainly includes preheating of sorbitol and oleic acid (in winter), pumping (or vacuuming) to high-level storage tanks for backup, catalyst preparation, sorbitol dehydration, esterification, cooling, filtration, barreling and packaging, etc. In the two-step production process, sorbitol is first dehydrated and then added to the reactor for esterification reaction with oleic acid. Sorbitol dehydration and esterification reactions are separated. After dehydration is completed in a stainless steel sorbitol dehydration tank (with stirring), the dehydration temperature is about 130°C, which can remove 70% of the water. Then it is added to the reactor to esterify with oleic acid, and the reaction is carried out at a constant temperature of 210°C for 5 hours, and the reaction pressure is -0.096MPa.