Manufacture of high purity benzene and para-rich xylenes by combining aromatization and selective disproportionation of impure toluene
CA 2132947 A1 · Owner: Gloyn, Arnold J. · Inventors: Innes, Robert A.; Gloyn, Arnold J.; Nacamuli, Gerald J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is set forth for reacting impure toluene to obtain benzene, toluene and a para-rich xylene stream, which are substantially free of close-boiling non-aromatics. The impure toluene comprises at least 70 wt% toluene and between about 0.2 wt% and about 5 wt% close-boiling non-aromatics. The process may also comprise aromatizing a naphtha over a non-acidic catalyst. The impure toluene from the aromatization step is passed over an acidic intermediate pore zeolite to produce a para-rich xylene stream and chemically pure benzene.
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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
- Filed September 26, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 26, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 26, 2016.
- 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
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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.