Study on the Process Parameters for Deacidification and Decolorization of Pentaerythritol Ester Through Distillation
Molecular distillation,a non-equilibrium continuous distillation technology that operates under high vacuum for liquid-liquid separation,is employed to achieve deacidification and decolorization of pentaerythritol ester,which is an ester-type base oil.By examining the effects of distillation temperature,distillation pressure,and distillation flow rate on the refining result of the oil,optimal process parameters for deacidification and decolorization through distillation are identified to provide a reference for industrial production.The results show that molecular distillation is an effective method to reduce the acid value and impurities,and improve color transparency of pentaerythritol ester.The optimal deacidification process parameters were found to be a distillation temperature of 170 ℃ to 180 ℃ and a distillation vacuum of 7 Pa to 10 Pa.Under this process,the distillation yield of the oil is consistently above 97%,with a distillation capacity of over 3.4,and the oil acid value can be reduced from 2.17 mg/g(milligrams of KOH required,same throughout the text)to 0.16 mg/g~0.22 mg/g.The optimal decolorization process parameters were found to be a distillation temperature of 220 ℃,a distillation flow rate of 597.60 g/h to 768.00 g/h,and a distillation pressure of 0.1 Pa.Under these conditions,the acid value of the oil could be reduced to 0.15 mg/g~0.16 mg/g,and the color could be processed to a water-white transparent color.(Charts8 Tables5 References15)