The chemistry of paper-making, together with the principles of general chemistry; a handbook for the student and manufacturer by Griffin R. B. (Russell B.) & Little A. D. (Arthur Dehan) 1863-1935 joint author

Author:Griffin, R. B. (Russell B.) & Little, A. D. (Arthur Dehan), 1863-1935, joint author
Language: eng
Format: epub
Tags: Papermaking
Publisher: New York, H. Lockwood & Co.
Published: 1894-03-25T05:00:00+00:00

THE CHEMISTRY OF PAPER-MAKING

tarre of the water is soon raised to a point where it can no longer hold the gas in solution. This liberated gas, passing upward with that still coming from the digester, soon increases in quantity to such an extent that the water falling down is not sufficient to dissolve it, and there is constantly delivered from the top of the tower a stream of pure gas, while from the bottom of the tower hot water is drawn, to be used in washing or for other purposes. The amount of sulphur thus saved is usually not less than 20 per cent.

In the Mitscherlich process the waste gases are blown through a pipe leading from one of the upper manhole plates to a lead coil immersed in water. All the digesters are connected with this coil, which in turn is connected to one of the towers. The steam carried over by the gas is condensed and the pure gas passes on into the tower. Such recovered gas, being undiluted with atmospheric nitrogen, is better suited for the preparation of strong liquors than the original furnace gas. It may be made to yield a liquor standing 12° Be*.

Dr. Kellner has also used the coil and tower for recovering the gas blown off during the cook. For recovering that discharged

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