Main-Product

Phosgene is the chemical compound with the formula COCl₂. This colorless gas is valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles freshly cut hay or grass. In addition to its industrial production, small amounts occur naturally from the breakdown and the combustion of organochlorine compounds, such as those used in refrigeration systems. The chemical was named by combining the Greek words 'phos' (meaning light) and genesis (birth).

Industrially, phosgene is produced by passing purified carbon monoxide and chlorine gas through a bed of porous activated carbon, which serves as a catalyst:

The reaction is exothermic, therefore the reactor must be cooled. Typically, the reaction is conducted between 50 and 150°C. Above 200°C, phosgene reverts to carbon monoxide and chlorine, K_eq (300K) = 0.05.

Source: Infogalactic, Phosgene

Gas