Process for the treatment of phenol-containing waste water from coal degassing or gasification processes

Patent 3972693 Issued on August 3, 1976. Estimated Expiration Date:

August 3, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3292345

3335071

3404072

3594987

Inventors

Assignee

Metallgesellschaft Aktiengesellschaft

Application

No. 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

Examiners

Primary: Hart, Charles N.
Assistant: Burks, Richard W.

Attorney, Agent or Firm

Foreign Application Priority Data

1972-06-15 DT

Abstract

Dissolved 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sump product of the deacidification column to the first column at a region below the region at which the condensate is withdrawn but intermediate the top and bottom portions of the NH3 -removal column.