How should liquid-phase monomer contained in PVC polymerization off-gases be treated?
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How should liquid-phase monomer contained in PVC polymerization off-gases be treated?
In PVC off-gas recovery, is that portion consisting of liquid-phase monomers and non-condensable gases? What are the main control parameters for the general process of exhaust gas recovery used by the poster? Details have been provided; hello everyone, please share some suggestions.
Is it winter? Otherwise, how could it be in a liquid state? Ensure proper insulation.
Is there a blockage in the condenser, causing poor flow of the liquid?
By checking which section contains the liquid-phase monomer, a reflux line can be added to lead it to the monomer recovery tank, as long as self-polymerization of the liquid phase does not occur.
The entry of liquid (monomer or water) into the recovery device can have a significant impact on the membrane (membrane recovery) or adsorbent, even leading to their destruction. Therefore, a buffer tank (or gas-liquid separator tank) is generally installed in front of the recovery unit
Is there any liquid phase discharge from the polymer tail gas recovery vent? If it is indicated that the condensation efficiency of the polymer tail gas recovery condenser is poor, it is recommended to use water at 7°C or 0°C as the cooling medium for the primary and secondary condensers, which will enable better condensation and recovery of the monomer.
The PVC polymerization off-gases must first be cooled in a pre-cooler to a temperature of 0–7°C; thereafter, an airfoil-type high-efficiency gas-liquid separation unit is used to remove the liquid droplets carried in the gas phase. Only then does the clean gas stream proceed to the membrane recovery device. Otherwise, the membrane recovery device will be damaged. For information on the feather-leaf type high-efficiency gas-liquid separator, please visit www.novelenergytech.com to learn about its performance parameters, application records, and contact details.