Patent ID: 6238638
Filing Date: 2001-05-29
Classification: C01B

Abstract:
A process for the preparation of nitrosyl chloride from a solution of nitrosylsulphuric acid in sulphuric acid and from hydrogen chloride, the said process comprising:preparing the nitrosyl chloride by a continuous process in a device that is a reactor or a column whereina) said solution of nitrosylsulphuric acid in sulphuric acid is substantially free of water,b) said solution of nitrosylsulphuric acid in sulphuric acid is fed into the top of the device,c) aqueous hydrochloric acid is fed into the top of the device,d) gaseous hydrogen chloride is fed into the bottom of the device, ande) said aqueous hydrochloric acid and said gaseous hydrogen chloride are used in amounts such that the molar ratio of aqueous hydrochloric acid to nitrosylsulphuric acid is between 0.25 and 1.2, and the molar ratio of aqueous hydrochloric acid and of gaseous hydrogen chloride to nitrosylsulphuric acid is between 1.25 and 5.