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Displaying 461 - 480 of 1612 stories.
November 1, 2010
When automating fluid handling processes, it is critical to ensure that you are using the best type of pump for the process, and to understand how to control the type of pump you are using. The two major classes of process pumps — centrifugal and rotary positive displacement — require completely different control techniques. It is important to understand each pump type’s limitations, and...
http://www.che.com/extras/pdf/Process-Pump-Control_6112.html
November 1, 2010
Last month, I had the rare honor of sitting down with about 40 students from Booker T. Washington High School’s engineering magnet school (Houston), who are all on the path toward careers in science and engineering. While the experience itself was inspirational, it also caused me to reflect — again — on what defines inspiring chemical engineering practice. My encounter was at a student...
http://www.che.com/extras/pdf/A-passion-for-breakthroughs_6113.html
November 1, 2010
When tanks are draining, the potential may exist for a swirling vortex to form leading from the liquid surface to any of the bottom-exit or side-exit nozzles connected to downstream piping (Figure 1). One important aspect of the vortex is whether it will entrain air or other gases into the discharge flow. Such vapor entrainment can lead to a host of problems, ranging from vacuum collapse of the supply...
http://www.che.com/extras/pdf/Predict-and-Prevent-Air-Entrainment-in-Draining-Tanks_6114.html
November 1, 2010
Measurement of fluids’ viscosity in the chemical process industries (CPI) can represent a useful “product dimension” for manufacturers. Understanding a material’s flow characteristics is valuable in predicting several parameters relevant to many CPI processes, including pumpability, pourability, performance in a dipping or coating operation, ease of handling or processing. The...
http://www.che.com/extras/pdf/Viscosity-Measurement_6115.html
November 1, 2010
In obtaining a degree or even a professional license in chemical engineering, there is little, if any, mention of facial hair. Nevertheless, that aspect of my appearance was surprisingly pivotal at one particular moment in my career. At that time, I had zero facial hair — no moustache, no beard, and no long sideburns — and I was a liquid-liquid extraction expert. It was therefore obvious to...
http://www.che.com/extras/pdf/Hazards-of-column-entry_6116.html
November 1, 2010
Although proper water treatment and conditioning for combined-cycle units and standalone steam generators are vitally important for reliability in the chemical process industries (CPI), a well maintained and operated steam generator can also save the facility much money with regard to efficient performance. This article outlines some of the primary thermodynamics behind steam generator heat transfer...
http://www.che.com/extras/pdf/Steam-Generation-Thermodynamics_6117.html
November 1, 2010
PLANT WATCH Construction starts on new helium plant in U.S. October 13, 2010 — Air Products and Chemicals, Inc. (Lehigh Valley, Pa.; www.airproducts.com) and Matheson (www.mathesongas.com), a member of the Taiyo Nippon Sanso Corp. (TNSC) group, have announced that onsite construction has commenced on a new, jointly owned liquid-helium production plant near Big Piney, Wyo. The plant, designed to...
http://www.che.com/extras/pdf/Construction-starts-on-new-helium-plant-in-U-S-and-more-business-news_6118.html
November 1, 2010
Following the devastating explosion at the Imperial Sugar Co.’s Georgia factory that killed 14 people, injured many more employees and leveled the facility in February 2008, it was determined by the U.S. Occupational Safety and Health Admin. (OSHA; www.osha.gov) officials and the U.S. Chemical Safety Board (CSB; both Washington, D.C.; www.csb.gov) that the catastrophe could have been prevented had...
http://www.che.com/extras/pdf/Explosion-Prevention_6119.html
November 1, 2010
Halogen Valve System This monitor detects toxic and hazardous gases The Jupiter gas-detection system model HVS4000 (photo) monitors and reports information about hazardous and toxic gases to Scada systems. It is a microprocessor-based instrument capable of detecting a wide range of toxic gases in ppm quantities, including ammonia, carbon monoxide, ozone, chlorine dioxide and sulfur dioxide. The HVS4000 can...
http://www.che.com/extras/pdf/November-New-Products-Domestic-Edition_6120.html
November 1, 2010
Perten Instruments Group Analyze plant matter quickly, without grinding With an analysis time of only 6 s, the DA 7200 near infrared (NIR) analysis system (photo) and a new calibration feature offers many benefits for forage analysis (plant matter). The unit can analyze forage samples as they are — without grinding required. The calibrations include fresh and dried or ground samples and are accurate...
http://www.che.com/extras/pdf/November-New-Products-International-Edition_6121.html
November 1, 2010
Mechanical centrifugal air classifiers are used extensively to process aggregates, ceramics, chemicals, foods, minerals, metals, plastics, flyash and other materials. They are normally employed when the particle size that you need to separate is too fine to screen. The air-classified product can be either the granular coarse discharge with very little fines and dust, or it can be the fines discharge with...
http://www.che.com/extras/pdf/Mechanical-Centrifugal-Air-Classifiers_6123.html
November 1, 2010
A new SM process Exelus Inc. (Livingston, N.J.; www.exelusinc.com) received a $500,000 grant from the U.S. Dept. of Energy (DOE; Washington, D.C.) to help pilot the company’s styrene monomer (SM) process ( CE, January 2007, p. 13). The funds are part of DOE’s Small Business Innovation Research XLerator program, designed to help develop scaled-up manufacturing processes. The ExSyM process...
http://www.che.com/extras/pdf/November-Chementator-Briefs_6127.html
October 1, 2010
North America ChemInnovations. Chemical Engingeering (New York) and Access Intelligence (Rockville, Md.). Phone: 713-343-1880; Web: cpievent.com Houston Oct. 19–21 Using WirelessHART Communication in the Process Industries. HART Communication Foundation (Austin, Tex.). Phone: 512-794-0369; Email: hartcom.org Houston Oct. 21 Huntington Beach, Calif. Oct. 26 Bakersfield, Calif. Oct. 28 Coating and...
http://www.che.com/extras/pdf/Calendar-October-2010-January-2011_6018.html
October 1, 2010
Standardized steam-methane-reforming (SMR) reactor units recently commercialized by Air Liquide (Paris, France; www.airliquide.com) allow direct hydrogen production at customer sites at costs much lower than those associated with alternative H2 supply modes, including electrolysis and transporting compressed or liquefied H2. Because of the technology’s specific applicability to facilities that...
http://www.che.com/extras/pdf/A-modular-SMR-unit-provides-onsite-hydrogen-production_6019.html
October 1, 2010
A group of Singapore researchers have reported a new approach to induce the coiling of prefabricated gold nanowires (AuNWs) inside polymer shells, leading to structures resembling torsion springs. In contrast to gas-phase methods that require high temperatures and are limited to non-metallic nanomaterials, the transformation of straight wires into circular rings takes place in a colloidal solution by...
http://www.che.com/extras/pdf/Nanowires-that-spring-into-action_6020.html
October 1, 2010
Photos: Teijin Group Toho Tenax Co. (Tokyo; www.tohotenax.com), the main company of the Teijin Group’s carbon fibers business, has commercialized a gas-diffusion layer (GDL) made of carbon fiber fabric for use as an electrode component for fuel cells. GDLs are a key component of the electrode in fuel cells, supplying hydrogen and oxygen while collecting electrons generated and discharging...
http://www.che.com/extras/pdf/Fabric-of-carbon-fibers-set-to-improve-fuel-cell-performance_6021.html
October 1, 2010
A plasma-based process has achieved a 30% yield of methanol from methane in a microreactor system developed by a research team led by Tomohiro Nozaki, associate professor at Tokyo Institute of Technology (TiTech; Tokyo, www.mech.titech.ac.jp). The yield is nearly the same as that obtained in conventional methanol-synthesis reactors (in single pass), which catalytically convert...
http://www.che.com/extras/pdf/Micro-plasma-reactor-makes-methanol-from-methane_6022.html
October 1, 2010
Westec Environmental Solutions, LLC (WES; Chicago, Ill.; www.wes-worldwide.com) has developed a gas-liquid absorption technology that can dramatically enhance mass transfer in gas-liquid absorption, extraction and scrubbing systems. The patented WES Absorber operates co-currently and creates a micro-froth matrix that intensifies mass transfer. Co-current operation allows the column to operate at gas...
http://www.che.com/extras/pdf/A-new-multiphase-contactor-promises-to-cut-costs-for-carbon-capture-and-more_6023.html
October 1, 2010
Crystallization is a key purification technique for various sectors of the chemical process industries (CPI). Several approaches for industrial crystallization have evolved over time and highly specialized crystallizer designs have been developed, especially in long-established industries. Solution crystallization is an important unit operation because the process can generate high-purity products from...
http://www.che.com/extras/pdf/MSMPR-Crystallization-equipment_6029.html
October 1, 2010
Every distillation engineer west of the River Neretva is familiar with the work of Professor Zarko Olujic. His distillation laboratory at the Technical University of Delft (The Netherlands; www.tudelft.nl) is one of the largest and best facilities in the history of distillation. His work is typically funded by a consortium of companies that, most recently, included Bayer, BASF, Evonik, DSM, Montz...
http://www.che.com/extras/pdf/Zarkos-challenge_6030.html
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