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Electropositive filters take advantage of surface-charge effects to filter nanometer-sized particles. Provided here is an overview of how they work and where they can be used Electropositive filters take advantage of surface-charge effects to filter nanometer-sized particles. Provided here is…
Regulation of water content in polymeric membranes is important in several applications, including proton-exchange fuel cell membranes. Normally, this is achieved either by external regulation or by operating the cells at higher temperatures. Now a team from CSIRO (Melbourne, Australia;…
Professor Hisao Hori and his research group at Kanagawa University (Hiratsuka City, Japan; www.kanagawa-u.ac.jp) have reported what is said to be the first photo-induced recovery of rhenium from aqueous solutions — an achievement with implications for an inexpensive way to…
A process for the separation and recovery of stranded and associated natural gas is being developed by Framergy, Inc. (Wilmington, Del.; www.framergy.com), with support from the National Science Foundation’s Small Business Innovation Research (SBIR) Phase I program. The company is…
Pressure swing adsorption technology is well known for H2 purification applications, but the technique can also be used for other gas-separation processes in petroleum refining facilities Pressure swing adsorption (PSA) is a well-established process for the separation and purification of…
A new self-cleaning filter from Spiral Water Technologies Inc. (San Rafael, Calif.; www.spiralwater.com) can efficiently treat water with 25,000 mg/L total suspended solids (TSS). According to Spiral Water CEO Ashwin Gulati, the filters use much less energy — reportedly just…
Acoustic wave separation (AWS) technology can improve cell-culture clarification in biopharmaceutical applications by enabling high-efficiency, continuous removal of cells in a closed system without centrifugation. Developed by FloDesign Sonics (Wilbraham, Mass.; www.flodesign.org) and licensed to Pall Corp. (Port Washington, N.Y.;…
Understanding how different filtration methods work leads to a more informed decision when selecting a filtration system Filtration is arguably the most commonly used unit operation in the chemical process industries (CPI). The range of applications for this important unit…
A new composite-membrane distillation process capable of removing salt, toxic elements and microorganisms from water is being offered commercially for the first time this month. The process, known as NanoClear, was developed by Dais Analytic Corp. (Odessa, Fla.; www.daisanalytic.com) for…