光气（ COCl2）又名碳酰氯或氯代甲酰氯，常温下为无色气体，易液化，具有强烈的刺激性气味和窒息性，不易燃，微溶于水，易溶于苯、甲苯、二甲苯、氯仿、四氯化碳等有机溶剂。光气遇水后易分解。光气属于剧毒物质，急性中毒易引起肺水肿、肺炎、使人感到胸闷胸痛、呼吸困难， Phosgene (COCl2), also known as carbonyl chloride or chloroformate, colorless gas at room temperature, easy liquefaction, with a strong irritating odor and asphyxia, non-flammable, slightly soluble in water, soluble in benzene, toluene, Xylene, chloroform, carbon tetrachloride and other organic solvents. Phosgene easy to decompose after contact with water. Phosgene is a highly toxic substance, acute poisoning can cause pulmonary edema, pneumonia, chest pain, chest pain, difficulty breathing,