Method and apparatus for separating polychlorinated biphenyls from fluidizable solids
DCFirst Claim
1. A method for treating a fluidizable solid material contaminated with a toxic organic contaminant having a boiling point of at least 110°
- C. comprising;
fluidizing and heating said fluidizable solid in a drying vessel at a temperature sufficient to enable recovery of substantially all of said toxic organic contaminants in a gaseous stream out of said drying vessel, leaving 5 parts per million or less of the contaminants in the fluidizable solids, thereby separating the contaminant from a major portion of the fluidizable solids; and
removing said gaseous stream containing said separated contaminants from said drying vessel for further treatment.
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Abstract
A process and apparatus for treating any fluidizable solid material having a polychlorinated biphenyl contaminant absorbed or adsorbed thereon. The method and apparatus includes heating the fluidizable solids, using hot turbulent gas at a temperature in the range of 850° to 2,500° F. to vaporize and thereby separate the polychlorinated biphenyls from the fluidizable solids and to fluidize at least a portion of the solids. The polychlorinated biphenyl vapors are then further treated to dispose of the polychlorinated biphenyls, such as by condensing the liquid and filtering or decanting them from the condensed water.
19 Citations
29 Claims
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1. A method for treating a fluidizable solid material contaminated with a toxic organic contaminant having a boiling point of at least 110°
- C. comprising;
fluidizing and heating said fluidizable solid in a drying vessel at a temperature sufficient to enable recovery of substantially all of said toxic organic contaminants in a gaseous stream out of said drying vessel, leaving 5 parts per million or less of the contaminants in the fluidizable solids, thereby separating the contaminant from a major portion of the fluidizable solids; and removing said gaseous stream containing said separated contaminants from said drying vessel for further treatment. - View Dependent Claims (2, 3, 4)
- C. comprising;
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5. A method for treating a fluidizable solid contaminated with a polyhalogenated orgainc toxic chemical comprising:
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contacting the fluidizable solids in a separator with hot turbulent gas at a temperature sufficient to enable recovery of substantially all of the toxic organic contaminants in a gaseous stream out of the separator and thereby separate the polyhalogenated organic from the fluidizable solids and gaseously entrain a portion of the finer fluidizable solid sludge in particulate form, leaving a dryed particulate mass of fluidizable solids having about 5 ppm or less of polyhalogenated organics; and removing said gaseous stream containing the separated polyhalogenated organics from said separator. - View Dependent Claims (6, 7, 8, 9)
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10. A method of removing a toxic chemical having a boiling point of at least 110°
- C. from a fluidizable solid comprising;
conveying said fluidizable solid said a hot, turbulent gas at a temperature of about 850°
-2500°
F., into a vaporization chamber;contacting said fluidizable solid with said hot turbulent gas in a hot glas-fluidizable solid first fluidized bed contacting zone in a lower portion of said vaporation chamber to fluidize at least a portion of said fluidizable solids in said lower vaporation chamber, to vaporize a majority of said toxic chemicals from said fluidizable solids in said lower portion thereby forming a gaseous stream containing said toxic chemicals recoverable from said vaporization chamber; and
to cool said hot gases;conveying said cooled hot gas upwardly through said vaporization chamber at a rate sufficient to propel a finer particulate portion of the fluidizable solids above the first fluidized bed contacting zone to a second fluidized bed contacting zone at a lower temperature than, and disposed above, said first fluidized bed contacting zone, whereby a finer particulate portion of the fluidizable solids is fluidized by said cooled hot gases and additional toxic chemical is vaporized from said fluidized finer particulates in said second fluidized bed contact zone; removing said gaseous stream containing said gases and vaporized toxic chemicals from the vaporization chamber for further treatment. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
- C. from a fluidizable solid comprising;
Specification