Why does the by-product hydrochloric acid generated during the absorption of hydrochloric acid in the chlor-alkali chlorination process turn red when exposed to light?

Probably because the by-product hydrochloric acid makes it feel as though it isn’t produced using normal processes; it has an introverted even shy personality and a thin skin, which is why its face turns red when exposed to light. In the by-product production process, some kind of impurity must end up in the hydrochloric acid. A comprehensive analysis of a sample should allow it to be determined what type of impurities are present, and how these impurities are related to the production process and the equipment used.

The by-product hydrochloric acid turns red when exposed to light, and a red precipitate appears after resin adsorption, mainly due to the presence of ferric chloride (FeCl3). During the chlor-alkali chlorination process, metal impurities such as iron may enter the reaction system. These metal impurities form corresponding chlorides by reacting with chlorine gas. In particular, iron, which forms ferric chloride in hydrochloric acid, causes the liquid to turn red. At the same time, when resin is used for treatment, if the resin has an adsorptive effect on ferric chloride, then the deposition of ferric chloride on the surface or in the pores of the resin will also result in a red precipitate. To address this issue, consider optimizing the production process to reduce the intrusion of metal impurities, or using treatment methods that can effectively remove metal ions. .