ApplicationNo. 367387 filed on 06/06/1973
US Classes:95/158, Degasification step occurs first, with removed gas subsequently contacted by liquid95/245, By stripping with gas95/264Steam is stripping gas
ExaminersPrimary: Hart, Charles N.
Assistant: Burks, Richard W.
Attorney, Agent or Firm
Foreign Application Priority Data1972-06-15 DT
AbstractDissolved organic compounds in waste water resulting from coal degassing or gasification processes are removed by extraction with a solvent which is substantially water-immiscible, the solvent residues in the waste water are removed by inert gas scrubbing, and CO2, H2 S and NH3 in the waste water are removed by heating and steam contacting. NH3 is effectively removed in a steam gas/liquid contacting column by feeding the condensed head product of the column back to the top portion thereof, withdrawing a portion of the condensate from the column at a level intermediate the top and bottom portions of the column, treating the condensate in admixture with waste water containing CO2, H2 S and NH3 in a deacidification gas/liquid contacting column, and feeding the sump product of the deacidification column to the first column at a region below the region at which the condensate is withdrawn but intermediate the top and bottom portions of the NH3 -removal column.