From the boiler house are supplied with superheated steam at a pressure of 35 /b to the in.
For example, in the Gritti and Orlando processes the ore is charged into retorts and the fusion effected by superheated steam, the sulphur being run off as usual; or as was suggested by R.
Pipe superheated steam at 330° F.
The simplest modes of preparing pure glycerin are based on the saponification of fats, either by alkalis or by superheated steam, and on the circumstance that, although glycerin cannot be distilled by itself under the ordinary pressure without decomposition, it can be readily volatilized in a current of superheated steam.
The steam is superheated and may thus be heated to any desired temperature without increase of pressure, which would be liable to damage the still.
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