Tianjin Chemical Plant, formerly known as "Hangu Workshop of Toyo Chemical Industry Co., Ltd.", was built by the Japanese invaders in 1938. It has more than 250 employees and produces chemical products such as caustic soda, hydrochloric acid, mirabilite, bromine and potassium chloride. 1946 was accepted by the national government and changed to "Hangu Factory of Tianjin Chemical Company, Resources Committee". 1948 65438+February, after Hangu was liberated, it was taken over by Jidong administrative office and martial law was imposed. 1949 1 was changed to North China People's Government, and in August it was renamed as "Hangu No.1 Factory, Preparatory Office of North China Chemical Industry Company of the Ministry of Public Enterprises". 1950 changed its name to "Tianjin Chemical Plant" in August, and it belongs to the Chemical Industry Administration Bureau of the Ministry of Heavy Industry. July 1956, changed to Ministry of Chemical Industry. 1958 1 month, changed to the First Industry Department of Hebei Province, and was attached to Tianjin Chemical Industry Bureau in July. In July, 1960 was attached to Tangshan Light and Chemical Handicraft Bureau; 1962 belongs to the Ministry of Chemical Industry, and 1969 belongs to Tianjin Chemical Industry Bureau. 1993, changed to Tianjin Bohai chemical group.