Method for preparing plasticizer 1, 2, 4-benzenetricarboxylicacid tris(2-propyl heptyl) ester

A method for preparing a plasticizer 1, 2, 4-benzenetricarboxylicacid tris(2-propyl heptyl) ester belongs to the technical field of chemical synthesis. The method comprises the steps: by adopting trimellitic anhydride and 2-propyl heptanol as main reaction raw materials, mixing and heating in the presence of a titanate catalyst, activated carbon and attapulgite to esterify to obtain a 1, 2, 4-benzenetricarboxylicacid tris(2-propyl heptyl) ester crude product after reaction is finished; and carrying out neutralizing, alkali washing and washing on the crude product in turn, distilling at reduced pressure to remove the excessive alcohol, and filtering to obtain the 1, 2, 4-benzenetricarboxylicacid tris(2-propyl heptyl) ester finished product. The method has the advantages of available and low price selected raw materials, small catalyst usage, no obvious corrosiveness, small environmental pollution and the like, and is convenient for operation and energy-saving. The obtained product has small volatility, extraction resistance and transfer resistance and has advantages which are similar to those of a polyester catalyst; and moreover, the compatibility, processability and lower temperature performance of the obtained product are comparable to those of phthalic acid ester, and the obtained product has a wide application.