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A thermal wet-air-oxidation process treats gasifier soot

By Chemical Engineering |

Scheduled for startup in the second half of this year, the Long Lake integrated bitumen and upgrading project (near Fort McMurry, Alberta) now under construction by OPTI Canada, Inc. (edlinks.chemengonline.com/6892-536) and Nexen, Inc. (both Calgary, Alberta) is the first gasification project that that combines heavy-oil recovery and upgrading. The project applies the Shell Gasification Process (SGP), which converts liquid asphaltene byproduct of the primary upgrader into hydrogen and synthesis gas, and the proprietary OrCrude primary uprgrading process licensed from ORMAT (Reno, Nev.) to produce 60,000 bbl/d of synthetic crude oil from Canadian oil sands. The bitumen in the sands contains relatively large quantities of vanadium, nickel and other metals, which become concentrated in the gasifier feed and, thus, in the gasifier soot. To handle this waste stream, the project will use a patent-pending Zimpro wet-air-oxidation (WAO) process — developed by OPTI and Siemens Water Technologies Corp. (formerly U.S. Filter/Zimpro, Inc.; Rothschild, Wisc.; edlinks.chemengonline.com/6892-537) — to convert the soot into more valuable forms. In the Zimpro WAO process (flowsheet), the influent aqueous stream and compressed air are pumped…
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