US Patent 7968053 Chlorine analyzing apparatus

A chlorine analyzing apparatus includes a reaction tube of a double tube structure with an inner tube for receiving a sample and an outer tube for recovering hydrogen chloride. An electric furnace has a reaction tube insertion hole into which the reaction tube is inserted. The electric furnace is equipped with a heater disposed around the reaction tube insertion hole. A titration cell receives acetic acid as an electrolyte and subjects hydrogen chloride withdrawn from the reaction tube to coulometric titration. A deodorization tube is disposed on a rear stage side of the titration cell for thermally decomposing a vapor of acetic acid discharged from the titration cell. The deodorization tube is fitted into the electric furnace.