Defoamers for Phosphoric Acid and Fertilizer Production

Wet-process phosphoric acid production from phosphate rock generates significant amounts of foam and undesirable gases, which limit plant production efficiency. In a typical wet-process phosphoric acid production process, phosphate rock is reacted with sulfuric acid in large digesters or reactors. In addition to the calcium phosphate in the ore being converted to phosphoric acid (P2O5) and calcium sulfate (gypsum), there are numerous side reactions due to impurities in the rock, which contribute to foam and gas generation in the reactor.