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

Displaying 201 - 220 of 288 stories.
January 1, 2009
Here, we present criteria needed for the intelligent, effective specification of trays for a distillation or stripping column. Among the key parameters and accessories during specification are column diameter, tray spacing, number of trays, number of passes, type of downcomers, weir heights, provision of downcomer backups, tray pressure drops, design of bottom seal pan, column bottom arrangement, and...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Tray-Column-Design_4443.html
January 1, 2009
For wastewater treatment, membrane bioreactors (MBRs) provide superior effluent quality in a small footprint compared to alternative activated-sludge treatment methods. However, MBRs are prone to fouling, and thus may require frequent membrane cleaning with the associated manpower and chemical costs. Microdyn-Nadir GmbH (Wiesbaden; www.microdyn-nadir.de), in cooperation with Darmstadt University (both...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/membranes/Chementator-This-mechanical-cleaning-process-reduces-fouling-in-MBRs-without-chemicals_4456.html
January 1, 2009
Solvay Solexis S.p.A. (Bollate, Italy; www.solvaysolexis.com) has commercialized a new perfluorosulfinic acid (PFSA) polymer, tradenamed Aquivion, which was specifically designed for polymer electrolyte membrane (PEM) fuel cells. Aquivion ionomer...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/membranes/Chementator-A-new-PFSA-polymer-for-membrane-and-other-applications_4460.html
December 1, 2008
A new membrane is combined with a novel process design to reduce energy costs in a CO2 recovery system developed by Membrane Technology and Research Inc. (MTR, Menlo Park, Calif.; www.mtrinc.com). The two-step system uses a membrane made of a hydrophilic rubbery polymer, formed into spiral-wound modules. The membrane is 10 times more permeable to CO2 than conventional membranes used for CO2, says...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/membranes/Chementator-Using-membranes-to-lower-the-cost-of-CO2-capture_4395.html
September 15, 2008
The need to conserve water is becoming a common concern throughout the world. Whether this is due to the cost of water, availability of water, or environmental concerns, water conservation is becoming a major focal point, both in the public and private sector. In those areas where renewable water resources are limited, and in regions where there are significant environmental concerns and costs associated...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Feature-Report-Water-Reuse-and-Conservation-in-the-CPI_4171.html
September 15, 2008
Vogelbusch GmbH (Vienna, Austria; www.vogelbusch.com) has developed a patent-pending distributor system that it claims makes possible the adaption of simulated moving bed (SMB) chromatography for use in the pharmaceutical industry. Prior to this, SMB use has been limited to the commodity sector, says the firm (see CE, August 1994, p. 30). The...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Chementator-Single-column-SMB_4195.html
September 15, 2008
Crystallization is a method of solid-fluid separation in which pure chemical crystals are formed. Crystallization kinetics consists of three major phenomena: nucleation (the birth of a crystal), transfer of the solute from the supersaturated solution to the crystal surface, and a reaction during which the solute becomes incorporated into the crystal. Supersaturation In order to drive the process of...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/crystalization/Facts-at-Your-Fingertips-Crystallization_4172.html
August 15, 2008
A Filter Bag for Food, Drug and Beverage Applications Introduced by the manufacturer as the first series of filter bags specifically designed for the food, beverage, and pharmaceutical industries, Cleargaf filter bags (photo) promise full compliance with U.S. and European food contact requirements and are independently certified. The filter bags meet the EU’s more stringent regulations on low...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Focus-On-Filtration_4086.html
August 15, 2008
Market demand for water purification is driving reverse osmosis forward Increasingly, water has become one of the hottest topics of the decade. Estimates indicate that water usage has increased tenfold in the last ten years. A recent United Nations report noted that one third of the world’s population lives in areas suffering from water shortages. Furthermore, industrial demands for water are...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Technology-Showcase-Reverse-Osmosis_4096.html
July 15, 2008
Monitoring Our Atmosphere Please refer to the Editor’s Page, April 2008: Mr. Gerald Ondrey’s last sentence sums it up. "Ultimately, the only truly green solution is to reduce consumption — the second law of thermodynamics says so." Rep. Roscoe Bartlett (R, Md.) speaks out plain and clear regarding energy policy, but colleagues respond politically and not...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/membranes/July-2008-Letters_3999.html
June 15, 2008
ExxonMobil Corp. (Irving, Tex.; edlinks.che.com/7373-537) plans to spend more than $100 million on a commercial demonstration of its Controlled Freeze Zone (CFZ) technology for removing carbon dioxide from natural gas. The plant, to be located at the company’s Shute Creek Treating Facility near LaBarge, Wyo., will...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Chementator-Scaleup-is-set-for-a-natural-gas-treating-process-that-freezes-out-CO2_3960.html
June 15, 2008
After several years of proven operation in the food- and nutritional-products industry, a patented drying technology is now ready to be applied for any liquid or slurry product. Developed by MCD Technologies, Inc. (Tacoma, Wash.; edlinks.che.com/7373-535), the Refractance Window (RW) system is said to cost about one third as much as freeze drying equipment, and consumes about one third to half the energy...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/evaporation/Chementator-Drying-at-the-speed-of-light_3958.html
May 15, 2008
Carbone Lorraine (CL; Paris, France; edlinks.che.com/7372-538) is launching a new welded-plate heat exchanger, dubbed Heatex, which features plates made of tantalum CL-Clad. The patented CL-Clad technology involves the brazing of steel onto "reactive" metals, such as tantalum, titanium and zirconium, in order to fabricate columns, reactors and (now) heat exchangers used in corrosive service. Such...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/absorption/Chementator-These-Heat-Exchangers-Feature-Tantalum-as-an-Alternative-to-Graphite_3880.html
May 15, 2008
  FIGURE 1. In a typical system for wastewater treatment, the liquid feed is introduced at the top of the column and steam is introduced at the bottom In recent years, steam strippers have become integral parts of industrial plant operations. The goal when designing these types of columns is to have reliable operation for as long as possible. This article details the methodology used when designing...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Engineering-Practice-Designing-Steam-Stripping-Columns-for-Wastewater_3863.html
April 28, 2008
Caloric Anlagenbau GmbH (Gräfelfing , Germany; www.caloric.com) has signed its first contract for the supply of a carbon dioxide recovery unit using aMDEA-solvent (activated methyl diethanolamine). The plant was ordered by a German engineering company and is part of a syngas treatment facility to be located in Spain. The recovery unit is...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/absorption/Calorics-1st-aMDEA-based-CO2-recovery-plant_3833.html
April 15, 2008
Last month, the first pilot project that used chilled ammonia to capture carbon dioxide from the fluegas (FG) of a coal-fired power plant started operating at the 1,210-MW We Energies’ Pleasant Prairie power plant in Wisconsin. Alstom (Windsor, Conn.; edlinks.che.com/7371-531) designed, built and will operate the 1.7-MW pilot system, which is part of a cost-sharing partnership of 35 utilities...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Chementator-An-ammonia-based-CO2-capture-process-moves-several-steps-closer-to-commercialization_3807.html
April 15, 2008
Packed Columns [1] A packed column is a vertical, cylindrical pressure vessel containing one or more sections of a packing material over whose surface the liquid flows downward by gravity, as a film or as droplets, between packing elements. Vapor flows upward through the wetted packing, contacting the liquid and facilitating absorption of the vapor into the liquid. Packings are offered in either random or...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/absorption/Facts-at-your-Fingertips-Random-Tower-Packing_3792.html
March 15, 2008
Although nanoporous silica membranes are promising systems for the molecular separation of gases and liquids, they lack microstructural stability in the presence of water at temperatures as low as 60°C. Prolonged exposure to water causes hydrolysis, resulting in the formation of large, non-selective pores and cracks in the membrane. On the other hand, polymeric membranes are less prone to damage by...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Chementator-A-promising-nanosieve-for-dehydrating-solvents-and-biofuels_3739.html
March 15, 2008
Alstom Power, Inc. (Windsor, Conn.; edlinks.che.com/7370-571) and The Dow Chemical Co. (Midland, Mich.; edlinks.che.com/7370-572) have established a joint development and...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/Chementator-Amine-scrubbing_3743.html
March 15, 2008
An understanding of instrumentation is valuable in evaluating and troubleshooting column performance Instrumentation is critical to understanding and troubleshooting all processes. Very few engineers specialize in this field, and many learn about instrumentation through experience, myth and rumor. A good understanding of the various types of instrumentation used on columns is a valuable tool for engineers...
http://www.chemengonline.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Feature-Report-Column-Instrumentation-Basics_3729.html
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