Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB36394/28A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IG Farbenindustrie AGfiledCriticalIG Farbenindustrie AG
Publication of GB303351ApublicationCriticalpatent/GB303351A/en
303,351. I. G. Farbenindustrie Akt.- Ges. Dec. 31, 1927, [Convention date]. Nitric acid is separated from solutions containing other volatile acids such as halogen acids or their salts, by reducing the nitric acid to nitrogen oxides by gaseous reducing agents such as sulphur dioxide, washing the evolved nitrogen oxides with water or alkaline solutions, and oxidizing them with air or oxygen to form nitric acid or by treatment with alkaline agents to form nitrates or nitrites.