The hot gases from the furnace impart their heat to the
liquor, causing the volatilization of the condensed gases, and at the
same time act chemically upon the liquor and evolved gases, so that
ammonia and sulphuric acid are resulting products, in the compound
state of sulphate of ammonia. The formation of the ammonia produced in
the process is probably due to the decomposition of nitrogenous bodies
contained in solution in the liquor--the sulphocyanide, for instance;
the nitrogen being given off in the form of ammonia. Of the sulphuric
acid produced, we look upon the sulphureted hydrogen as the source,
also any sulphites existing in the liquor, which in their volatile
state take up the atom of oxygen necessary for their conversion into
sulphate.
[Illustration]
The apparatus used in working the process consists of a tower still,
containing a number of superposed trays about 3 or 4 inches apart,
with a lipped hole through the bottom of each at the side. The trays
are so placed in the tower that the holes are at alternate sides.
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