The
liquor passes into the top of the still, and zigzags down through the
series of trays, as in an ordinary Coffey still. The bottom tray
differs from the rest; being much deeper, and having holes through it
connecting it with the furnace, which is set immediately below it. The
products of combustion of the fuel are caused to pass from the furnace
up through the holes in the trays in the still, and, together with the
gases evolved from the liquor, are directed into the saturator, where
the sulphate of ammonia is obtained either in solution or in the
crystalline state.
Where the process is at present being worked, an exhauster is used to
draw the furnace gases through the still; but it might be advantageous
to use a blower.
A small plant has been put in action at the gas works in Kilkenny and
another on a larger scale, and differing somewhat in detail, here in
Glasgow at the Alum and Ammonia Company's works, where the liquor from
the Tradeston Gas Works is converted. The trials on a working scale
have only been made at both places within the past ten days; and, so
far, nothing has appeared against the principle, though in certain of
the details of construction some alterations are being made to improve
it.
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