P 2307 (OTTO) Potassium hydroxide, pellets, GR 85%+ Cas 1310-58-3 - used in petroleum and natural gas refining for removal of organic acids and sulfur compounds. P 2307 (OTTO) Potassium hydroxide, pellets, GR 85%+ Cas 1310-58-3 - used to dry basic solvents, especially amines and pyridines.