Highly regulated hazardous chemical processes – reactions at atmospheric pressure
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Requirements for hazardous chemical processes under strict supervision: Basic requirements for safety control; Alarms and interlocks for the temperature and pressure in reaction vessels； Proportional control and interlock of reaction materials ； Stable control of stirring ； Feed buffer ； Emergency feed cut-off system ； Emergency cooling system ； Safety relief system ； Chlorine absorption and neutralization system in accident conditions ； Flammable and toxic gas detection and alarm devices, etc. A suitable control approach is to establish an interlock relationship between the temperature and pressure inside the chlorination reactor, as well as the mixing speed within the reactor, the flow rate of the chlorinating agent, and the inlet valve for the cooling water in the reactor’s jacket; furthermore, an emergency shutdown system should be implemented. Safety facilities include safety valves, high-pressure valves, emergency vent valves, level gauges, check valves, and emergency shut-off devices, etc. Some hazardous processes are carried out at atmospheric pressure. The reaction time vent valve is always in the open state; is it still necessary to install a safety valve in such a situation? How to set up a safety instrumented system?
The reaction takes place at atmospheric pressure; is the valve on the vent line always open? Is it possible that the valve was closed due to human error? Is it possible for the valve to get clogged? Is the material viscous or prone to crystallization, which could cause material buildup and blockage in the pipelines?
What specific parameters does stable control of stirring refer to?
The stirring condition and current are for reference only
Can hazardous chemical processes that are under strict supervision still have vent lines in place? Shouldn’t it be a safety valve? Valves are locked to prevent accidental operation, and burst discs are installed to avoid blockages.