S(=O)(=O)(O)O.Cl.P(=O)(O)(O)O.C(O)(=O)[C:13](O)=[O:14].[C:18](O)(=O)[CH2:19][C:20]([CH2:25]C(O)=O)([C:22]([OH:24])=[O:23])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:22]([O:24][CH:31]([CH3:41])[CH2:32][O:14][CH3:13])(=[O:23])[CH:20]([CH3:19])[CH3:25].[C:22]([O-:24])(=[O:23])[CH2:20][CH2:19][CH3:18]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 and methane sulfonic acid are preferred. The boiling points of propylene glycol monomethyl ether iso-butyrate and n-butyrate obtained according to the present application are 167.2° C. and 180.5° C., respectively, while other reactants and products having respective boiling point of 120° C. for PGM, 154.4° C. for iso-butyric acid, 164° C. for n-butyric 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 effect achieved by the process according to the present invention.
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