Temperature control during dropwise addition reaction
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In the production of phenolic resins, phenol is first heated in the reaction vessel, after which the steam supply is turned off; then a formaldehyde solution is added drop by drop to the vessel to carry out a polycondensation reaction, and the temperature of the reaction vessel is regulated by opening and closing the water valve. When adding the formaldehyde solution, the steam valve on the reaction vessel is closed; if the reaction temperature is high at this time, should the steam supply be cut off via interlock as well? (Is this contradictory to the temperature control measures in the polymerization process controls?)
Didn’t understand? The steam valves are all closed. With a high reaction temperature, aren’t the valves supposed to remain closed at all times? To cool down, the only way is to use refrigerant
If a steam pipeline is equipped only with manual valves and no interlocked shut-off valves, it is advisable to conduct a HAZOP analysis. In the event that the manual valves leak, an interlocked shut-off valve should be added as a precaution.