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This post was last edited by sunjl1981 on 2013-1-6 at 20:04. Recently, chemical industry magazines have been reporting incidents in which explosions occurred in liquid chlorine storage systems or liquid chlorine evaporation systems of certain companies due to operational errors or other mistakes. Through investigation and analysis, it was concluded that the explosion was caused by an excessive level of NCL3 in the system. During the production process of liquid chlorine, it is not possible to completely remove NCL3 due to technical constraints; as a result, concentration of NCL3 inevitably occurs in the liquid chlorine storage tanks and evaporators. If this is ignored, an explosion can occur in certain environments once the concentration reaches a certain level. This makes me think that the source of chlorine used in my company’s phosgene synthesis system is the same as that of some other companies: liquid chlorine is vaporized through a liquid chlorine evaporation system, and then enters the system in gaseous form. Especially now, with liquid chlorine being transported in tankers instead of in bottles, it is inevitable that more NCL3 will be entrained. Therefore, I believe that from a safety perspective, it should be monitored regularly to prevent any unforeseen issues. The following is a brief overview of some properties of NCL3 and the measures taken by our company: 1. Physical and chemical properties of nitrogen trichloride: It is a yellow, viscous liquid or rhombic crystals, and is highly explosive. It has a pungent odor similar to that of chlorine. Density: 1.65 kg/cm², melting point: