GB190501202A - Improvements in the Manufacture of Non-inflammable Products from Benzene - Google Patents

Abstract

1202. Birkbeck, H., [Barboni, E. B.]. Jan. 21. Chloro-benzenes.-Benzene is chlorinated in the presence of carbon bisulphide and iodine, or substances such as antimony, pentachloride, for the purpose of rendering it non-inflammable. The benzene is contained in an enamelled cast-iron vessel A, provided with a water jacket B, or an internal steam coil, and with a hollow perforated rotating stirrer C, through which dry chlorine is introduced. The vessel A is connected with either a reflux condenser D or an ordinary condenser H, as may be required. In the example given, benzene is mixed with carbon bisulphide, and iodine is dissolved in the mixture. Chlorine is introduced, with stirring, the vessel being connected with the reflux condenser, and the hydrochloric acid evolved being absurbed in water in the carboys F. Suction may be applied at G. The operation ceases when iodine chloride is deposited. Sulphur is then added to the cooled liquid through a man-hole, the current of chlorine being interrupted. The vessel being connected with the condenser H, a jet of steam is introduced into the jacket, and the liquid is distilled. The distillate is agitated with water to decompose sulphur chloride, decanted, and agitated with dilute caustic soda, after which the product is dried, e.g. with calcium chloride, and then filtered. The product is a mixture of chluro derivatives dissolved in unchanged benzene, their general formula being C6 H6-n Cln Specification No. 17,695, A.D. 1902, is referred to.