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    • 5. 发明专利
    • Improvements in the Manufacture of Nitro-cellulose and in Apparatus therefor.
    • GB190308278A
    • 1904-04-07
    • GB190308278D
    • 1903-04-09
    • THOMSON JAMES MILNTHOMSON WILLIAM THOMAS
    • THOMSON JAMES MILNTHOMSON WILLIAM THOMAS
    • 8278. Thomson, J. M., and Thomson, W. T. April 9. Nitro-cellulose.-In the manufacture of nitro-cellulose, the waste acids are removed by direct displacement with water. The nitrating- vessel a is provided with a perforated false bottom b, supported on the base c by means of ribs c , the outlet pipe being provided with a perforated plate e. A charge of nitrating-acids is introduced by the pipe m, the cellulose is then added, and sulphuric acid, or other inert liquid, having a density not greater than that of the waste acids formed, is run on to the surface of liquids from the tank k through the pipes h, h into the perforated troughs f and down the depending aprons g. When the nitration is complete, water is run gently on to the surface through the tubes h, h , and the acid slowly drawn off. The first part of the nitration may be carried out with waste acid from a previous operation, and the apparatus may be used merely for washing purposes, the nitro-cellulose being introduced, covered with waste acid, and treated as described above. The process may be carried out in an ordinary centrifugal nitrating machine, which is used to effect preliminary drying after the acid separation. The acids and water may be supplied to the centrifugal machines or other vessels by perforated pipes lying along the edges of the nitrating-vessels.