Two-stage coal liquefaction process
CA 1234364 A · Owner: Chevron Research And Technology Company · Inventors: Kuehler, Christopher W.; Dahlberg, Arthur J.; Cash, Dennis R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for liquefying coal by first forming a coal solvent slurry. In a hydrothermal dissolving-stripping zone the coal is substantially dissolved in the solvent to form a mixture comprising solvent, dissolved coal insoluble, solids, and light products, while simultaneously the mixture is stripped of substantial amounts of the light products by contacting the slurry countercurrently with a first hydrogen gas stream at elevated temperatures. A gaseous stream comprising the light products is withdrawn from the hydrothermal dissolving-stripping zone. At least a substantial amount of the insoluble solids is contacted in a reaction zone with a second hydrogen gas stream and an externally …
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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 March 22, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 22, 2005.
- 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.