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A study of black liquor oxidation in towers packed with asbestos cement plates
Author(s) -
Murray F. E.
Publication year - 1958
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450360203
Subject(s) - cement , asbestos cement , tower , packed bed , airflow , black liquor , asbestos , full scale , mass transfer , materials science , volumetric flow rate , chemistry , pulp and paper industry , composite material , environmental science , waste management , chemical engineering , engineering , mechanics , structural engineering , chromatography , mechanical engineering , physics , organic chemistry , lignin
The process of black‐liquor oxidation is treated theoretically and an equation is derived for design purposes. Capacity coefficients were determined experimentally for two different arrangements of asbestos‐cement packing sheets. Data include those obtained from a study of a full‐scale commercial oxidation unit as well as those from an investigation using a pilot‐scale experimental tower with a modified arrangement of asbestos‐cement packing. Results from the pilot‐scale study indicate that the modified packing yields higher capacity coefficients than the packing in the full‐scale unit although the mass‐transfer coefficients are very similar for both packings using the pilot‐scale tower under rigorously controlled flow conditions, it was found that the capacity coefficients increase with increase in liquor flow rate and are virtually unaffected by changes in air‐flow rate when this is sufficiently high to provide adequate oxygen for the reaction. The significance of the experimental results is discussed in detail.