The various parameters of the low-column system in the VCM plant are normal; then why is the material in the high column and recovery column acidic?
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All parameters of the low-tower system are normal; why is the material in the high-tower, recovery tower acidic?
The high tower unit is acidic, so the waste discharged into the recovery tower must also be acidic. All the individual parameters for entering the high tower are normal; where in the high tower was sampling done that showed acidity? It should be the decomposition of the monomer, releasing hydrogen chloride; however, such a decomposition reaction generally occurs under high temperature and pressure. What method did you use to determine that the monomer is acidic, and what is the pH value?
It may be caused by moisture in the monomer, corrosion of pipeline equipment, etc. Trace amounts of oxygen can promote the decomposition of the monomer, while the hydrolysis of iron ions generates acidic substances. Please feel free to offer your criticism and suggestions!