Chemistry of inorganic compounds – Halogen or compound thereof – Elemental halogen
Patent
1985-06-20
1988-01-12
Heller, Gregory A.
Chemistry of inorganic compounds
Halogen or compound thereof
Elemental halogen
202267R, 203 31, 203 93, 203DIG25, 423500, C01B 709, B01D 310
Patent
active
047190965
ABSTRACT:
A highly efficient continuous process for the winning of bromine from a bromide-containing brine which increases overall bromine recovery efficiency, decreases chlorine requirements, decreases waste-brine neutralization, improves steam recovery, increases capacity and significantly reduces total amount of steam necessary for bromine recovery over prior art. This is accomplished by operating a two-stage subatmospheric apparatus comprising a steaming out tower and a secondary flash chamber. The steaming out or contact tower is operated near the vapor pressure of the feed brine so that only stripping steam is required to remove elemental bromine from the brine. The second stage or secondary flash chamber is operated at a lower pressure than the stage one steaming out tower and enables recovery of bromine, steam and chlorine from the waste bromide-depleted brin or tail brine which might otherwise to be lost. The subatmospheric pressure operation of the two stages also reduces the operating temperature of the process which reduces side reaction effects and thus neutralization requirements prior to disposal of waste brine. Additionally, the overall capacity of the apparatus is greatly increased by reducing steam requiremnts from that required with conventional steaming out towers.
REFERENCES:
patent: 3959450 (1976-05-01), Calloue et al.
patent: 4175034 (1979-11-01), Thompson
Encyclopedia of Polymer Science and Technology, vol. 11, p. 65.
Kirk-Othmer Encyclopedia of Chemical Technology, 3rd ed., John Wiley & Sons, vol. 4, pp. 233-236, vol. 7, p. 885.
Chemical Engineers' Handbook, 5th ed., Ed. by Perry & Chilton, McGraw-Hill Book Co. 1973, pp. 23-61, 63.
Henry Herbert W.
Lesher Kenneth C.
Ethyl Corporation
Heller Gregory A.
Johnson Donald L.
Odenweller Joseph D.
Russel Jeffrey Edwin
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