A method of presulfurizing a catalyst
CA 2114547 C · Owner: Adams, Charles Terrell · Inventors: Seamans, James Dallas; Adams, Charles Terrell; Chen, Andrew An-Ju
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an improved method of presulfurizing a sulfidable metal or metal oxide-containing catalyst which sulfur stripping upon start-up of a reactor and improves catalyst activity. The method comprises contacting porous particles of the sulfidable catalyst with elemental sulfur at a temperature such that said elemental sulfur is incorporated in the pores of said catalyst by sublimation and/or melting and at the same time or subsequently heating the catalyst particles in the presence of a liquid olefinic hydrocarbon at a temperature greater than 150 °C.
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
- Filed July 28, 1992 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 28, 2014.
- 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.