Applications of by-product HCl in the PVC industry

The by-produced HCL can be used to generate HCl gas through a hydrochloric acid desorption unit, thereby reducing reliance on the chlor-alkali system. At the same time, this approach reduces the amount of by-product acid produced; such acid contains mercury, which limits its applications and creates significant sales challenges.

The by-product hydrogen chloride has several advantages in the production of vinyl chloride: 1. It reduces the amount of hydrochloric acid produced, thereby alleviating the pressure to sell this acid； 2. It can help reduce costs by decreasing the amount of hydrogen chloride used in synthesis, allowing chlorine to be applied to other profitable products such as propylene oxide and trichloroethylene. Disadvantages: 1. The by-produced hydrogen chloride contains impurities that need to be treated and purified before it can be used; otherwise, it can cause blockages in subsequent equipment, especially leading to self-polymerization. 2. Currently, the purification technologies for by-product hydrogen chloride are not yet fully developed; the operating conditions for hydrochloric acid desorption and pressure swing adsorption have limitations, and removing water and preventing corrosion caused by hydrogen chloride pose significant challenges.

What harmful components are present in the by-product hydrochloric acid after dialysis, which can affect subsequent processes? What treatments are required? Can the treated hydrogen chloride meet the requirements for entering the conversion process? Please explain! :)

Who knows what range of organic matter content in the by-product acid is suitable for desorption use? Thank you!