TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The solution is provided by dissolving celecoxib in the ketone solvent at a temperature of below the reflux temperature of ketone solvent used, where the heating step is carried out at a temperature of 40-65 degrees C for at least 5 minutes, and the solution obtained in step (a) or step (b) is optionally subjected to carbon treatment or silica gel treatment. The dissolution in step (a) is carried out at a temperature of 20-40 degrees C, and the heating in step (b) is carried out at a temperature of 45-55 degrees C for 10 minutes to 2 hours. The combining in step (c) is accomplished by adding the hot solution to the water or by adding the water to the hot solution at a temperature of above 40 degrees C for at least 10 minutes, and the reaction mass obtained after completion of the addition process in step (c) is cooled and stirred at a temperature of below 35 degrees C for at least 15 minutes to produce the slurry. The addition in step (c) is carried out at a temperature of 45-55 degrees C under stirring for 15 minutes to 1 hour, and where the reaction mass obtained after completion of the addition process in step (c) is cooled at a temperature of 0-30 degrees C for 30 minutes to 20 hours. The recovering in step (d) is carried out by filtration, filtration under vacuum, decantation, centrifugation, filtration employing a filtration media of a silica gel and/or Celite (RTM: Diatomite) and the substantially pure celecoxib polymorphic Form III obtained is further dried under vacuum or at atmospheric pressure, at a temperature of 35-70 degrees C. Preferred Components: The ketone solvent is acetone, methyl ethyl ketone, methyl isobutyl ketone and/or methyl tert-butyl ketone, where the amount of ketone solvent is less than 10 (preferably 4-6) vol./g of celecoxib. ACTIVITY - Antiinflammatory.    MECHANISM OF ACTION - Cyclooxygenase-2 (COX-2) enzyme inhibitor.    EXAMPLE - Celecoxib (10 g) was dissolved in acetone (50 ml) and the solution was heated to 50 degrees C. Water (50 ml) was added to the solution at 50 degrees C over a period of 30 minutes. The separated product was cooled to 5 degrees C and the slurry was stirred for 1 hour at 5 degrees C and then filtered. The product obtained was washed with a mixture of acetone and water followed by drying at 60 degrees C for 12 hours to give celecoxib in polymorphic form III (8.6 g, Purity by HPLC: 99.92%).