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Smith J.W.,University of Toronto | Ellenor D.T.,University of Toronto | Ellenor D.T.,Indium Corporation of America | Sheedy M.A.,Eco Tec Inc.
CHISA 2012 - 20th International Congress of Chemical and Process Engineering and PRES 2012 - 15th Conference PRES | Year: 2012

Process intensification is justified by the need to reduce the footprint of equipment and to increase the mass transfer rate of very fast chemical reactions. It had been suggested that flotation cells might be effective in improving the effectiveness of gas-liquid contacting for the control of H2S in a gas stream by mixing the gas with an aqueous solution, effecting the reactions, e.g., H2S → H+ + HS-. The results of experimental measurements on a bench-scale flotation devise were correlated by two dimensionless and one dimensional relationship incorporating the optimized process parameters. Gas velocity index, shear effectiveness index, and effective shear index were given a range of values which may be used to provide optimal design of the contacting system for mass transfer controlled processes. This is an abstract of a paper presented at the CHISA 2012 - 20th International Congress of Chemical and Process Engineering and PRES 2012 - 15th Conference PRES (Prague, Czech Republic 8/25-29/2012). Source


Krause L.,Eco Tec Inc. | Sheedy M.,Eco Tec Inc.
Ultrapure Water | Year: 2011

A specialty nutshell filter and short-bed IX system have been in continuous operation for 6 months at the time of writing article. During this time, the hardness target of <1 ppm has been consistently maintained, and off-site sample analysis has shown values <0.5 ppm. A salt-regenerated SAC:WAC configuration was selected based on the greater capacity of the WAC resin bed, and the desire to avoid on-site use and storage of HC1 and NaOH. Resin cleaning has not been required, but the details of a new <30-minute in-situ oil cleaning process have been described. Source


The use of short bed IX deionizer systems for the production of high-purity boiler feed make-up water, and condensate polishing, is described. The use of micro media filtration® (MMF) as a pretreatment for RO and IX systems is examined. Unlike conventional IX units, which load the resin to the maximum extent possible in order to extend run times, the short-bed IX unit uses only 10% to 15% of the total exchange capacity of the resin. Due to the defined interface layer between the media, the rinse to quality is much shorter for the MMF following a back-wash cycle. A major expansion at a coal-fired, supercritical power plant was conducted with MMF to produce the 2,000 gpm of service and cooling water. By treating the condensate prior to returning it to the boilers , the plant were able to reduce boiler maintenance and minimize blowdown by virtually eliminating contaminants being introduced due to tube leaks and concentration from evaporative losses. Source


Jones K.,Seneca Resources in Bakersfield | Dejak M.,Eco Tec Inc. | Falco G.D.,Eco Tec Inc.
World Oil | Year: 2011

Seneca Resources, the exploration and production segment of Houston-based National Fuel Gas Company, employed an ion exchange-based softener that eliminated the need for acid and caustic often used for regeneration of produced water softeners. Primary oil and solids separation in the system is accomplished using the pre-existing gravity separators and a refurbished induced gas flotation (IGF) cell. Effluent from this treatment is stored in a surge tank and sent under pressure to the 60-in.-diameter micromedia filter, where remaining suspended matter and oil are removed. Finally, the cartridge filter outlet is sent through the salt-regenerated, dual-bed SAC/WAG ion-exchange softener. The two-layer filter has an upper layer of coarse black walnut-shell media, followed by a lower layer of very fine, dense micromedia, and is designed to filter the produced water at high service flowrates. Softener resin cleaning, as a response to resin fouling by oil and suspended solids, has not been needed in the more than 20 months since the system has started up. Source


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