Use of anionic surfactants to aid in coal/water separation
CA 1108317 A · Owner: Alchem, Inc. · Inventors: Lee, Donald E.; Pollard, Leonard; Morton, Thomas W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention comprises a method of improving the separation of coal fines from water in froths produced by frothing coal with methylisobutyl carbonol and a hydrocarbon liquid which comprises treating said froth containing the fines with a surfactant from the group consisting of fatty sulfosuccinates, sulfated alpha olefins, and alkaryl sulfonates and then separating said fines from the water by either sedimentation or filtration or centrifugation or a combination of these unit operations.
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 September 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 1998.
- 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.