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phosgene

Product name phosgene
Synonyms carbonic acid dichloride
carbonyl chloride
CG
GOST no data
CAS 75-44-5

Phosgene is a colorless, highly toxic gas with odor of recently cut hay or green corn. It is easily soluble in most organic solvents and reacts with water. Phosgene is a chemical warfare agent but it is also a valuable industrial chemical. Phosgene reacts with ammonia to give urea and ammonium chloride. Reaction with amines, depending on conditions, results in alkyl(aryl)substituted carbamides or isocyanates. Interaction with metal oxides yields to anhydrous metal chlorides. Phosgene is an insidious poison as symptoms may be slow to appear. It causes pulmonary edema, chemosis and irritation of mucous tunic.

Production.

Commercially, phosgene is produced by passing purified carbon monoxide and chlorine gas through a bed of highly porous carbon, which acts as a catalyst 125-150°C.

Uses.

Phosgene is applied:

  • as a raw material to produce dyes (reaction with tertiary amines);
  • as an intermediate in manufacture of polycarbonates (polycondensation with diatomic phenols);
  • to produce urea and its derivatives;
  • for anhydrous metal chlorides production;
  • as an intermediate in production of isocyanates, acid chlorides, polyurethanes, pesticides, pharmaceuticals, solvents;

  • Manufacturer(s) JSC Korund
    Chemical structure of phosgene

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