Tetrachlorphthalic anhydride   Tetrachlorphthalic anhydride  [117-08-8] (TCPA) is manufactured by the ferric chloride catalyzed chlorination of phthalic anhydride. The relatively low chlorine content and the lower flame retardant efficiency of the aromatic chlorides limit use to unsaturated polyester resin formulations that do not require a high degree of flame retardancy.

Molecular formula : C8Cl4O3 MW : 285.90 CAS No. :117-08-8 nature : colorless crystal or powder needle. Melting point 255 ° C (sublimation), the boiling point of 366 ° C (371 ° C). Soluble 1,4-dioxane, insoluble in ether, is not soluble in cold water, hot water into tetrachlorophthalic terephthalic acid decomposition. Odorless.  Preparation : anhydride made by the sulfuric acid generated from chlorine reaction. Nothing may also terephthalic acid chloride in 98 ° C heat dehydration obtained.  Applications:: reactive flame retardant, can be used for polyester, epoxy resin. Tetrachlorophthalic phthalic anhydride is pesticides (rice blast phthalocyanine), dyes, pharmaceuticals, plasticizers, fire proof paints and other organic synthesis intermediate.

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