Safe distance from phosphorus trichloride
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I am preparing a safety assessment report for a project related to **the monitoring of the chemical phosphorus trichloride**. The site where this facility will be built is located about 20 kilometers away from the city center; the proposed plant area will include a cafeteria and staff rest rooms； 50 meters away from the phosphorus trichloride production facility; phosphorus trichloride is a corrosive and toxic chemical ； It is mainly used as raw material for producing pesticides. Is it allowed to have employee rest rooms and canteens on the factory premises? What is the safety distance? It seems there’s no evidence available on this matter ； Could that expert give some guidance?
The \"Hygienic Standards for the Design of Industrial Enterprises\" GBZ1-2002 stipulates that 4.2.1.2 The zoning of the overall layout of industrial enterprises should be carried out in accordance with the principle of locating administrative and office spaces as well as living and welfare facilities within the area in front of the factory, while production workshops and auxiliary rooms should be placed within the production area. For industrial enterprises that generate harmful substances, no non-production facilities shall be installed within the production area, except for duty rooms, **rooms, and washrooms.
The Code for Fire Protection Design of Buildings stipulates that employee dormitories are strictly prohibited in factory buildings, but they are allowed within the factory complex, provided that the fire separation requirements are met. The 50m you mentioned is already enough.
According to the provisions of Code for Building Design 50016-2006, the fire separation distance is sufficient. However, the issue is that phosphorus trichloride is a **controlled chemical, and its toxicity is: highly hazardous**； The raw materials for producing phosphorus trichloride are yellow phosphorus and liquid chlorine ； All are highly toxic substances ； Workers can easily suffer poisoning from exposure. **Are there any requirements regarding the health protection distance from toxic hazards? So ； This case is primarily focused on preventing the effects of poisoning, and we would like to discuss it from this perspective:
It is sufficient to meet the fire separation distances specified in Code for Building Design 50016-2006; since it is not a gas, its diffusion rate will not be high
The health protection distance is determined based on the calculations carried out by the environmental protection authorities. There are many manufacturing enterprises that handle highly hazardous materials. The construction site for this enterprise is located about 20 kilometers away from the city center, and it is necessary to build appropriate living and welfare facilities there. In terms of the risks posed by toxic substances, the factory area should only accommodate shift workers’ dormitories and temporary housing; complete residential suites should not be built there. The distance between the dormitory and the toxic-producing workshop can be determined as the protective distance calculated using a toxin dispersion model.