1. In a cotton seed oil manufactory, cotton seeds are crushed and extracted with n-hexane to produce oil. (nHexane: b.p.:68C; e.1.: 1.27.7). (15)a) Discuss the safe work condition by considering explosion limits (e.1.). If the formation of a hazardous explosive atmosphere cannot be completely eliminated, it is necessary to take measures to avoid active sources of ignition. The more strongly dangerous explosive atmosphere is likely to occur, the more precisely it should avoid such sources. What to do in this situation: - use of other materials instead of combustible materials, if possible. -limitation of concentrations. -inert substance use. to prevent or limit the formation of explosive atmosphere around the factory. -To prevent ignition sources from coming together with explosive atmosphere. (15)b) Which engineering, administrative and personal control measures should be taken for a safe process? Explain briefly. Since n-hexane is highly toxic and hazardous for the environment, process control equipments are needed. In general, process control engineering application instruments are used to prevent the formation of hazardous explosive atmospheres or sources of ignition or to reduce the hazards of explosion. PCE Instruments are protective systems with instruments used to reduce the harmful effect of explosion. " working equipment conditions - selection of equipment "installation of equipment If there is a potential risk of explosion in a workplace, this work organization has an obligation to take certain precautions: operating instruction "worker's license "employee training -work permit system "maintenance and repair -supervision and control - Marking of dangerous areas