Explosives . injurious to the surroundings. The gas is thereforepassed through a condenser consisting of a large lead tank packed with care-fully graded coke. Formerly the gas was drawn off by means of a steam injec-tor in the pipe P, but this was very extravagant in steam and caused thecondensed acid to be very dilute. Now a fan is used instead. Water issprayed into P to assist the condensation of the acid. The general arrange-ment of the plant is shown in Fig. 16. Careful regulation of temperaturesand draughts is necessary to ensure the best results. In deciding what strength of oleum it is
Explosives . injurious to the surroundings. The gas is thereforepassed through a condenser consisting of a large lead tank packed with care-fully graded coke. Formerly the gas was drawn off by means of a steam injec-tor in the pipe P, but this was very extravagant in steam and caused thecondensed acid to be very dilute. Now a fan is used instead. Water issprayed into P to assist the condensation of the acid. The general arrange-ment of the plant is shown in Fig. 16. Careful regulation of temperaturesand draughts is necessary to ensure the best results. In deciding what strength of oleum it is best to use one of the properties Melting-that must be carefully considered is that of the melting-points of the acids. In pomts-Fig. 17 (pp. 104-5) are given the values as determined by Knietsch and publishedby him in the important paper on the contact process, which he read before theGerman Chemical Society in October It will be seen that there are 1 Ber., 1901, 4093; Chcm. Ind., 1902, p. I. 7.
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