Process for purifying waste water containing phenol and phenol formaldehyde
CA 1088231 A · Owner: Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler · Inventors: Junkermann, Helmut; Hafner, Volker
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a process for purifying phenoland phenol-formaldehyde containing waste water with chlorine dioxide, comprising treating the waste water with alkali or alkaline earth chlorites in the presence of formaldehyde the, ratio by weight of formaldehyde to phenol lying between 0.5 and 2:1, and the molar ratio of the sum of phenol and formaldehyde to chlorite being between 1:1.2 and 1:2.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted October 21, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 21, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.