HENRY DEACON 181 



material, over which gases pass and act on 

 the solid materials chlorine on dry slaked 

 lime, sulphurous acid gas, air and vapour of 

 water on common salt ; also drying diluted 

 chlorine by means of chloride of calcium or 

 sulphuric acid. 



No. 1,908. 2 ist July, 1871. This in- 

 vention consists in causing heated sulphuric 

 anhydride (SO 3 ) to pass over or through 

 heated chloride of sodium, by the reaction 

 that takes place the sulphate is formed corres- 

 ponding to the chloride employed and 

 chlorine is liberated. The working of this 

 process is connected with processes previously 

 mentioned which had been patented. For 

 the complete conversion of an alkaline 

 chloride (MCI) into its corresponding sulphate 



!M 2 SO 4 ) with the liberation of its chlorine 

 Cl), one equivalent of oxygen (O) is required, 

 for every equivalent of sulphuric acid (SO 8 ), 

 or two equivalents of oxygen (2O) for every 

 equivalent of sulphurous acid (SO 2 ) or four 

 equivalents of oxygen (4.O) for every 

 equivalent of sulphur (S), or is expressed in 

 the following formula : 



SO 2 + 2O = (ultimately) SO 8 + O 

 SO 8 O + MCI -(ultimately) MSO 4 + C1. 



