Gas Illuminante 2

Illuminating Gas 2

Aspiratore rotativo

In questa parte dell’impianto il gas illuminante veniva purificato dall’ammoniaca nella torre A dove, entrando dal basso F, incontrava una pioggia di acqua alla quale cedeva l’ammoniaca. Le soluzioni ammoniacali erano raccolte in K.Tramite pompe aspiratrici rotative L o a getto di vapore (Fig. 1) il gas era poi inviato, attraverso l’assorbitore di acido solfidrico R, al gasometro (vedi tavola 18). Nell’assorbitore R il gas cedeva l’acido solfidrico di cui era ancora ricco, ad una massa solida costituita da solfato ferroso, calce ed idrossido ferroso (H₂S + Fe(OH)₂ ® FeS + 2H₂O)

The Rotary Aspirator

In this part of the system the illuminating gas was purified of its ammonia. The gas entered tower A from below F where it encountered a shower of water, and in which the ammonia contained in the gas dissolved. The ammoniacal solution was collected in K. By means of rotary aspirating pumps L or a blast of steam (Fig. 1), the gas was transported across the absorber of hydrosulfuric acid R to the gasometer (see Chart 18). In the absorber R, the gas, still rich in hydrosulfuric acid, encountered a solid mixture of ferrous sulfate, lime, and ferrous hydroxide. The H₂S was extracted thus:

H₂S + Fe(OH)₂ ® FeS + 2H₂O