Mysore Petro Chemicals, a public limited company promoted by H P Dhanuka in 1976, manufactures phthalic anhydride (PA) and Maleic Anhydride (MA)from it's plant at Raichur, Karnataka(12000 tpa capacity) and Taloja Maharashtra (5400 mt capacity) respectively. The process knowhow for anhydride plant was supplied by Chemis he Fabrik von Heyden, Germany. The production of phthalic anhydride depends on the availability of the raw material orthoxylene, which is imported.

MPCL has diversified into the manufacture of maleic anhydride at its plant at Taloja, New Bombay, with a capacity of 45,000 tpa, in technical and financial collaboration with Lurgi, Germany. MPCL promoted a new company, I G Petrochemicals, a 100% EOU, in collaboration with Lurgi, Germany to produce Pathalic Anhydride.

The commercial production of Phthalic Anhydride (PA)-2 of IGPL plant has commenced during the year 1999-2000.

In 2000-01, to imporve the yield and the quality of PA, the company has recently changed the new catalyst in its plant at Raichur Plant. Due to erosion of networth the company has been referred to BIFR and subsequently the board has declared the company has Sick unit. IIBI was appointed as operating agency by BIFR.