S(=O)(=O)(O)O.Cl.P(=O)(O)(O)O.C(O)(=O)[C:13](O)=[O:14].C(O)(=O)C[C:20]([CH2:25][C:26]([OH:28])=[O:27])(C(O)=O)O.[C:31]1([CH3:41])C=CC(S(O)(=O)=O)=C[CH:32]=1.CS(O)(=O)=O>C(O)(=O)C>[C:26]([O:28][CH:31]([CH3:41])[CH2:32][O:14][CH3:13])(=[O:27])[CH2:25][CH3:20]The catalysts used in the present invention include inorganic acids, such as sulfuric acid, hydrochloric acid and phosphoric acid, and organic acids, such as acetic acid, oxalic acid, citric acid, p-toluene sulfonic acid and methane sulfonic acid, among which the strong acids including sulfuric acid, p-toluene sulfonic acid or methane sulfonic acid is preferred. Propylene glycol monomethyl ether propionate obtained according to the present application has a boiling point of 160.5° C., while other reactants and products having respective boiling point of 120° C. for PGM, 140.8° C. for propionic acid and 100° C. for water. It is apparently easier to rectify this solution comparing the respective boiling point of 146° C. for propylene glycol monomethyl ether acetate, 118° C. for acetic acid and 120° C. for PGM as in the conventional case. This is one of the effects achieved by the process according to the present invention.
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