246 



CHEMICAL MANUEES. 



gous products, accumulate iu the mother Hquors of the bicarbonate 

 of soda, from which they are extracted by distilUng the mixture of 

 alcohols, NHo neutralizing NHg, and then redistilling. ' Finally, 

 the residue from the distilled peat may be used as a substitutejfor 

 animal charcoal in the manufacture of clarifying and purifying 

 filters. The ammonia is present in the ammoniacal liquors more 

 especially as carbonate. 



Fig. 49. — Gaillot and Brisset's Oven for Eeeovering Ammonia from Peat. 



Gaillot and Brisset convert the organic nitrogen of peat' intc 

 ammonia by slow comJDUstion. The dry or moist peat — pure or 

 mixed with other nitrogenous matter — is crushed then fed into the 

 hopper A of the oven (Fig. 49). The bottom of the hopper consists of 

 a grating of flat rotary bars after the style of the laths of a metallic 

 Venetian blind, in such a way that if it be turned on its axis the 

 charge passes entirely into the oven, which is at once closed. The 

 combustion of the peat is fractionated into two stages ; at first it 



