Technology Unit

Further potential cleaning steps after chlorine drying include:

• adsorption on carbon beds to remove organic impurities;
• absorption-desorption using a suitable solvent such as carbon tetrachloride to remove;
• nitrogen trichloride and organic impurities;
• scrubbing with concentrated hydrochloric acid to remove nitrogen trichloride;
• scrubbing with liquid chlorine to remove nitrogen trichloride, organic impurities, carbon dioxide and bromine;
• irradiation with UV to destroy nitrogen trichloride and hydrogen.