The ion membrane hydrochloric acid electrolysis technology effectively addresses the challenge of handling by-product hydrochloric acid faced by enterprises in industries such as polyurethane, polyvinyl chloride, and epichlorohydrin production. This technology first purifies the by-product hydrochloric acid, then decomposes it into hydrogen and chlorine gas through an electrolysis process. The chlorine gas can be reintroduced into the upstream production process, while the hydrogen gas can be used as a raw material for other chemical reactions, improving resource utilization efficiency and supporting the green and efficient development of related industries.