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Archives :: Processing & Handling :: Separation (Liquid-Liquid & Gas-Liquid)

Displaying 261 - 280 of 284 stories.
October 1, 2006
Most of today's solar cells are made from silicon wafers cut from blocks of crystals. The wafers are typically 0.2-0.25-mm thick, yet most of the photon-to-electricity conversion takes place in the outermost 0.02 mm of the wafer. In an effort to reduce the amount of Si required (and thus the cost) for solar cells, BP Solar (Frederick, Md; edlinks.che.com/6517-538) is supporting a three-year research...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/crystalization/Efforts-to-reduce-the-cost-of-Si-based-solar-cells_3016.html
October 1, 2006
Last month, BOC Edwards (Wilmington, Mass.; edlinks.che.com/6517-549) completed installations of its new ERIX wastewaster treatment system at the College of Nanoscale Science and Engineering, of the University of...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/ion_exchange/HF-effluent-treatment_3022.html
October 1, 2006
It is well known that palladium membranes are ideal for purifying hydrogen because they allow only H2 to pass through (via diffusion of H atoms) while blocking all other molecules. Because contaminants cannot pass through this pore-free "filter", Pd membrane separation is especially suitable for ultrahigh-purity applications, such as those in the electronics industry, says Charles Krueger, vice...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/membranes/Reducing-the-cost-for-pro-ducing-high-purity-hydrogen_3010.html
September 1, 2006
    Distillation, based on differences in the volatility of components, is the most common unit operation for separating homogeneous mixtures. In simple distillation columns, a single feed stream is separated into two product streams. Complex columns are those that involve either two feed streams or three product streams - a side-stream in addition to the top and bottom products. These complex...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Optimization-of-Complex-Distillation-Columns_2821.html
September 1, 2006
(Wilmington, Del.; edlinks.che.com/6516-544) launched a new temperature-controlled evaporation source for depositing sensitive materials used for producing organic light-emitting diodes (OLEDs) and organic-chemical-based...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/evaporation/Organic-deposition_3004.html
September 1, 2006
Researchers at the Fraunhofer Institute for Environmental, Safety and Energy Technology (Umsicht; Oberhausen, Germany; edlinks.che.com/6516-533) are developing a new type of filter medium that can be manufactured with pores of precisely the same size (photo). The...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/filtration/These-sturdy-filters-have-designer-pores-for-microfiltration_2995.html
September 1, 2006
Manufacturing soda ash by either the Solvay or Hou process produces a large amount of waste sludge. About 10 m3 of waste — mostly liquid with 2–8 wt.% solids — is generated per ton of soda ash produced, says Trevor Sparks, marketing director, chemical process industries at Larox Corp. (Lappeenranta, Finland; edlinks.che.com/6516-537). The waste is composed of solid calcium carbonate and...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/filtration/This-pressure-filter-helps-soda-ash-producers-deal-with-waste-sludge_2998.html
August 1, 2006
Researchers at Pacific Northwest National Laboratory (PNNL; edlinks.che.com/6515-533) have demonstrated a new process for treating water contaminated by toxic perchlorate ions, found in drinking water in 35 U.S. states. As in conventional treatment methods, the process uses ion exchange to separate the ion from water. However, instead of...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/ion_exchange/Electrically-controlled-ion-exchange-offers-a-greener-way-to-treat-wastewater_2977.html
August 1, 2006
Eltron Research, Inc. (Boulder, Co.; edlinks.che.com/6515-553), in partnership with the U.S. Dept. of Energy's (DOE; Washington, D.C.) National Energy Technology Laboratory...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/membranes/H2-separation_2992.html
July 1, 2006
PuriTech (Dessel, Belgium; edlinks.che.com/6514-536) has developed a continuous ion-exchange system, called Ionex, which uses up to 75% less water and requires about half the volume of ion-exchange resin, compared with traditional fixed-bed systems, says PuriTech projects director Filip Rochette. Ionex also achieves a higher separation efficiency and product concentration compared to alternative systems...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/ion_exchange/A-multiport-valve-enhances-countercurrent-ion-exchange_2970.html
June 1, 2006
Sodium chloride aerosols are widely used as part of bronchial provocation tests to identify people with asthma, and those who wish to enter military or police service. To maximize their effectiveness, salt aerosol crystals should be as small as possible (< 5 μm dia.), but current production methods, such as milling, spray drying, and antisolvent crystallization, tend to produce NaCl particles that...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/crystalization/Chementator-Sonocrystallization-makes-a-salty-spray_2949.html
June 1, 2006
Researchers at the Lawrence Livermore National Laboratory (LLNL; Calif.; edlinks.che.com/5830-551) have constructed a membrane of carbon nanotubes (CNTs) on a silicone chip, which has the potential to reduce the...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/membranes/Chementator-Nanotube-membranes_2963.html
May 1, 2006
Toyo Engineering Corp. (TEC; Tokyo; edlinks.che.com/5829-536) has developed a new, cryogenic process for extracting natural-gas liquids (NGLs; ethane, propane, butane and other hydrocarbons) from liquefied natural gas (LNG). The Coreflux-LNG process boasts an ethane recovery efficiency of around 98%, compared to 90–93% efficiencies achieved by alternative processes, claims TEC. The process will be...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/liquid_liquid_extraction/A-new-NGL-extraction-process-makes-its-commercial-debut_2944.html
April 1, 2006
    Cartridge trays, defined below, can be the perfect hardware solution for distillation columns that are less than 3 feet (0.9m) in diameter and have a unique need for trays. Packing is usually the preferred choice for small-diameter columns, but there are several circumstances in which trays are advantageous. Examples include fouling systems, certain foaming systems, high-pressure applications...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Distillation-How-to-Specify-and-Install-Cartridge-Trays_3090.html
April 1, 2006
The presence of TCA (2,4,6-trichloroanisole) in cork can lead to undesirable tastes or smells in wine; this so-called cork taint affects about 3–6% of bottled wine. Although techniques (such as boiling in water or striping with superheated steam) have been used to remove TCA from cork, removal efficiencies have been limited to 70%, says Eduard Lack, R&D director at Natex...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/liquid_liquid_extraction/Prevent-cork-taint-with-high-pressure-extraction-_2922.html
April 1, 2006
Another process that removes up to 90% of the TCA from cork (see item above) was recently launched by Cork Supply USA (Benica, Calif....
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/liquid_liquid_extraction/-or-by-steam-distillation_2923.html
March 1, 2006
Siemens Industrial Solutions and Services Group (Erlangen, Germany; edlinks.che.com/5827-551) has built, commissioned and deployed the largest mobile water filtration system in the industry. The Horizontal...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Chementator-Mobile-water-plant_2908.html
March 1, 2006
    Minor components trapped in distillation columns can react to form solids that cause major problems. The conventional responses to this situation focus upon dealing with the solids after they have become formed. A better strategy consists of preventing or minimizing the solids formation in the first place, by changing the column operating conditions.   Understanding the situation The...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Minimize-Trapped-Components-in-Distillation-Columns_3089.html
March 1, 2006
Next month, Mekorot, Israel National Water Company Ltd. (Tel Aviv, Israel) will start up what is claimed as the world’s first ion-exchange system for selectively removing boron from potable water. The plant, designed and constructed by Treitel Chemical Engineering Ltd. (Tel Aviv; edlinks.che.con/5827-532), will treat 6,500 m3/d of reverse-osmosis-product water at Mekorot’s brackish water...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/ion_exchange/Chementator-Removing-boron-from-drinking-water_2903.html
March 1, 2006
Researchers at the Dept. of Chemical Engineering, University of Texas at Austin (edlinks.che.com/5827-547) have developed a rubbery membrane that can be used purify hydrogen. The membrane, based on...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/membranes/Chementator-H2-separation_2905.html
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