The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 1989
Filed:
Aug. 03, 1988
Heinz Pfenninger, Lupsingen, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
Aqueous fluids, such as chemical reaction solutions or effluents from chemical production plants or dye houses, containing organic compounds and salts of polyvalent inorganic acids, prefereably sulfates, are adjusted to a pH value in the range below about 4, concentrated by a membrane treatment and separated into an aqueous retentate concentrated with respect to the organic compounds and an aqueous permeate substantially free of organic compounds. Under these strong acid conditions an effective concentration of the organic compounds without the disturbing increase of the osmotic pressure caused by the presence of said salts can be reached. The concentrates can be easily disposed of and the permeates, for example effluents substantially free of any organic compounds can be discharged into a waste water plant for further treatments and purification.