OXIMIDOSULPHOXATES OR SULPHAZOTATES. ;[ 7 



classed apart by Claus and by Raschig shown to be such as tn demon- 

 strate the unity of their coiistifutioii as oximidosulphonates, or 

 Fremy's sulphazotates. 



Preparation of sodium and potassium oximidosulphonates. 



In practice two courses are open by which to proceed in prepar- 

 ing oximidosulphonates from nitrites : * to mix together solutions of 

 the nitrite and sulphite ; and to treat a solution of the nitrite and 

 hydroxide or carbonate with sulphur dioxide. The question, already 

 discussed by Claus, whether these methods are in [)rinciple identical, 

 need not here be considered, and will l^e taken up in a future paper. 



Fremy succeeded only by the second of these methods in getting 

 oximidosulphonates. Claus found both successful but the second to 

 be much more productive. Raschig recommended ÇAnnalen, 241) 

 the first method as being the more convenient and productive when 

 sodium salts are worked with, neutral potassium oximidosulphonate 

 and also an alkaline potassium-sodium oximidosulphonate being tlien 

 got by double decomposition wäth potassium chloride. Only in- 

 cidentally, in discussing Claus's views, did he mention that the second 

 method of getting tlie potassium oximidosulphonates is occasionally 

 successful. He included, however, this method in the specification of 

 his patent (1887)** for the manufacture of hydroxylamine. Both 

 methods have been investigated by us, and in what follows it will be 

 seen that we have found the second method to be much the better one, 

 whether for the potassium or for the sodium salt, but that the first 

 can be made far more successful than it has hitherto proved to be. 



* It has been shown by Raschig that oximidosulphonates are also obtainable from nitric 

 oxide, namely, by first converting it into nitrososulphonate, Pélouze's salt, and then letting this 

 decompose in alkaline solution. 



** Our references concerning the patent are abstracts in the Berichte, J. Cli. S., and 

 J. S. Ch. Ind. 



