METHOD OF MANUFACTURING ALKYL JASMONATE WITH HIGH EPIMER CONCENTRATION

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing continuously and efficiently alkyl jasmonate with epimer concentration >=20% from alkyl jasmonate having low epimer concentration which comes from alkyl jasmonate distillation purification process. SOLUTION: A series of processes are continuously executed which comprises (i) an isomerization process in which a fraction of alkyl jasmonate with epimer concentration <10% is used as source material and isomerization reaction enhances the epimer concentration to 10% or higher, (ii) a concentration distillation process in which the product obtained in the isomerization process (i) is distilled and concentrated to the epimer concentration >=20% and (iii) a process in which thin-film evaporation treatment is applied to the crude fraction having high epimer concentration obtained in the process (ii) and a fraction containing impurity of high boiling point is continuously eliminated.