A Study on Tetrachlorophthalic Anhydride by Catalytic Chlorination of Phthalic Anhydride Using GCMS

The synthesis of tetrachlorophthalic (TCPA) was studied by catalytic chlorination of phthalic anhydride (PAA) in the medium of chlorosulfonic acid using iron and iodine as catalyst. Qualitative analysis of chloro-products and its relative percentage of chloroproducts during different chlorination reaction stages (monochloro-phthalic anhydride, dichloro-phthalic anhydride, trichlorophthalic anhydride and isomerides) was analysed by means of GC-MS. Optimum process condition for promoting of product yield was found.