Several days later the disposal building caught on fire, apparently due to a fire started by the paint filters.Ĭan you explain how this might have happened. The company switched to the reformulated paint. Several test were done to ensure the reformulated paint worked well with the existing spray equipment and that the quality was satisfactory. ![]() This change was done in consultation with the paint company. At the end of each day, the filters were removed, placed in plastic bags, and stored for disposal in a separate building.ĭue to environmental concerns over volatile emissions from paint solvents, the paint supplier reformulated the paint to use a less volatile solvent. The paint droplets were collected by fibrous filters. The spray painting was done in a paint booth to reduce worker’s exposure and to collect any paint droplets that might be entrained in the exhaust air. Of reactants to prevent overpressure in the reactor Reactor vessel size and pressure rating Type of reactor (batch, semi-batch, tubular) Reactor temperature control and sequencing Semi-batch reactor reactant feed rates Catalyst concentrations max fill for batch and semi-batch reactors Alarm/shutdown setpoints Operating and emergency procedures Relief sizing and effluent treatment systems Solvent concentrations required to control reactor temperature 15Ī company had a spray painting operation to paint automotive parts. Heat exchanger duty to achieve required reactor cooling Cooling water requirements and cooling water pump size Condenser size in a reactor reflux system Max conc.Most reactive runaways result in 2-phase flow thru relief and require a relief area 2 to 10 times larger than single phase relief. Low reaction temperature in semi-batch reactor. Runaway Reactions Some ways for runaways to occur: Some chemicals can achieve self heat rates of 100’s deg. Larger vessels respond faster - less heat transfer thru walls!!! High pressure due to: Vapor pressure of liquid. Understanding Reactive Systems Cooling Water Exothermic Reaction Why important: reactions. Table AF-6: Some polymerizing compounds (these chemicals may polymerize rapidly with release of large amounts of heat). ![]() Table AF-4: Common water-reactive chemicals. Table AF-3: Chemical categories susceptible to water reactivity. Table AF-2: Some chemical structures susceptible to peroxide formation (the peroxides formed may become unstable and explode when disturbed).
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