ß ART. 13. — T. HAGA : 



ascertained that about a molecule of sulphur dioxide becomes fixed 

 during the reduction of a molecule of dibenzenesulphohydroxyl- 

 amine. Further, the total quantity of free sulphuric acid after 

 hydrolysis at l.WC. corresponds to more than ninety per cent 

 of the quantity required by the equation already given (p. 2). It 

 becomes, therefore, almost certain that sulphur dioxide is oxidised 

 to sulphur trioxide and that this acts on alcohol, producing 

 ethylsulphuric acid. This view has been confirmed by the fact 

 that the alcoholic solution, in which dibenzenesulphohydroxylamine 

 has been treated with sulphur dioxide, after evaporation to 

 dryness, yields alcohol on hydrolysis at 150°C. 



The experiment was carried out with about one-tenth of the 

 total quantity of the alcoholic solution resulting from the first ex- 

 periment (p. 2), in which the quantity of dibenzenesulphimide 

 formed was determined. For this purpose, the alcoholic solution, 

 after removing the excess of sulphur dioxide, was neutralised with 

 potassium hydroxide, evaporated to dryness and, finally, dried in 

 vacuo over concentrated sulphuric acid in order to remove every 

 trace of alcohol. The residue was heated with dilute hydrochloric 

 acid in a sealed tube at 150°C. for several hours. The hydro- 

 lysed product was neutralised with potassium hydroxide and distill- 

 ed, when a liquid was obtained, which had all the properties of 

 dilute alcohol. The amount of alcohol thus produced was estimated 

 approximately by comparing the quantity of iodoform obtained 

 from it with the quantities obtained from equal volumes of pure 

 aqueous alcohol of varying strengths. The result showed that the 

 distillate contained slightly more than one per cent of alcohol, 

 but decidedly less than two per cent. 



The above determination shows that the amount of alcohol 

 of the same strength to be produced from ethylsulphuric acid. 



