Abstract: This paper studies batch absorption with a two–section column for the treatment of tail gas containing hydrogen chloride (HCl). The operation not only makes the emission of hydrogen chloride meet the environment standard, but also can produce hydrochloric acid as a by–product. In the lower section of the column, dilute hydrochloric acid is recycled at a large flow rate as the absorbent. Fresh water at a smaller flow rate is used in the upper section. The temperature of the absorbent in the lower section should be below 40℃. In a laboratory test column, when the concentration of dilute hydrochloric acid in the lower section is 1%～15%, the rate of absorption for hydrogen chloride was over 99.5 %. In an industrial test column, the average rate of absorption for hydrogen chloride reached 97.6% and the concentration of by–product hydrochloric acid was 10%～15%.