3987. Scott, E. G. March 1. Ammonium sulphate.- Relates to the distillation of gas and other ammoniacal liquors in vacuo to obtain ammonia, which is subsequently treated with sulphuric acid to obtain ammonium sulphate. Fig. 1 shows a plant for this purpose, partly in section. The ammoniacal l i q u o r is pumped into the still c. The ammonia is given off, and with the steam rising from the liquor passes off by the pipe i to a vessel j, capable of resisting the action of sulphuric acid. The steam and ammonia pass through dilute sulphuric acid in the vessel j, which is also under a vacuum. Sulphate of ammonia is thus formed, and is removed continuously or at intervals. The steam which comes from the still c and that generated in the vessel j pass together to a second still m, the ammonia from which is treated in a vessel n similar to j. The vacuum is made by a pump o, in which the steam is partly condensed by the waste liquor supplied by the pipe p. The example shows a duplicate apparatus, but a series of three or more sets of apparatus may be employed.
展开▼
