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Chementator: Pd catalyst

Sigma-Aldrich (St. Louis, Mo.; edlinks.chemengonline.com/5829-550) has commercialized an air- and water-stable palladium catalyst for performing intermolecular cross-coupling reactions, aminations and intermolecular Heck transformations. The catalyst, developed by Professor Michael Organ at York University (Toronto, Canada), is based on a Pd-NHC…

A multilayered, self-sensing diaphragm for metering pumps

Mechanically driven diaphragm pumps (MDDPs) are widely used for metering applications in the chemical process industries. But because the pressure difference between the drive and the delivery side gives rise to tensile loads in the flexing zone of the diaphragm,…

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Chementator: Microbial contamination — see it and believe it

In Anaheim, Calif., last month at the Parenteral Drug Assn.’s annual meeting, Pall Corp. (East Hills, N.Y.; edlinks.chemengonline.com/5829-539) introduced Ascotec to the global market, a faster, more accurate system for detecting microbial contamination in clean-room air systems. When compared to…

A rotating contactor improves quality of bacterial cellulose

Although chemically identical to vegetation-derived cellulose, bacterial cellulose (BC) has a different tertiary structure, which imparts a number of unique — and commercially important — properties. For example, BC is nontoxic and biocompatible, and has a large water-holding capacity, which…

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Microreactors widen their reach for increased capacities

It is now fairly well established that mass- and heat-transfer efficiency, reaction selectivity and yield can be improved using microreactor technology (CE, July 2001, pp. 27–35). But the small channel dimensions (below one square millimeter) that are responsible for the…

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Metals-‘free’ H3PO4 is now available off the shelf

A new phosphoric acid that contains less than 100 parts per billion of 30 different metal ions is now commercially available from Febex S.A. (Box, Switzerland; edlinks.chemengonline.com/5828-539), the phosphorous specialties subsidiary of CECA Arkema Group (Paris). The new grade of…

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A new metal nitride

Using a diamond anvil cell to create high (up to 50 GPa) pressures, and a laser to create high (up to 2,000 K) temperatures, researchers from Lawrence Livermore National Laboratory (LLNL; Calif.; edlinks.chemengonline.com/5828-543), the Carnegie Inst. of Washington, and the…

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Know Your Hydrogen-Supply Options

    At present, around 540 billion Nm3 of hydrogen is produced worldwide, and the trend is upward (Hydrogen: The Real Action Is Today, CE, February, pp. 28ff). The numerous chemical-process and other industrial applications of this colorless, odorless gas…

3D nanostructures

By combining a high-resolution scanning electron microscope and an ion-beam microscope into a single device, researchers at the Max Plank Institute for Iron Research (Düsseldorf, Germany; edlinks.chemengonline.com/5828-545) are able to “see” the inner structure of nanomaterials, biological matter, and high-performance…

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Steam Handling

Sodium-ion monitoring can prevent steam-turbine corrosion Studies have shown that sodium is one of the most significant contributors to corrosion within turbines, and that such corrosion leads to cracking, embrittlement and ultimately, turbine failure. The Orion Ionplus 2111LL low-level sodium…