Process for esterification production of phthalate

The invention relates to a process for preparing phthalate, comprising following steps: (1) taking benzoic anhydride and relative excess alcohols as raw material, stirring and heating for dissolution, getting monoesters; (2) adding solid aluminum oxide into said alcohols solution, acting with caustic soda solution, getting sodium aluminate, adding lithium hydrate into said reactant of benzoic anhydride and alcohols for bi-esters action; filtering lithium compounds from reactants after reaction and getting coarse ester; (3) neutralizing said coarse ester to be alkalinity, washing alkalinity, dewatering and dealcoholizing, getting phthalate. The process is characterized by good color of product and high volume electrical resistivity.