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

Displaying 181 - 200 of 289 stories.
April 1, 2010
A rapid and ongoing expansion of polysilicon production capacity will likely generate an oversupply for the next several years, driving polysilicon manufacturers to further innovate processes and reduce operating costs in preparation for an impending wave of new demand. Drastic price drops experienced in 2009 are expected to continue at a slower pace in 2010, yet polysilicon producers remain poised to...
April 1, 2010
I read with great interest your article, Kettle Troubleshooting (February, pp. 26–33). The authors are to be congratulated on a very in-depth and timely presentation on the effects of boiling two-phase flow in kettle type reboilers. For over 45 years, I have been engaged in the refrigeration industry where refrigeration engineers are often challenged in designing evaporators to avoid liquid...
February 1, 2010
Many reactions, extractions, separations and other operations in the chemical process industries (CPI) involve the use of organic solvents. In addition to handling and disposal issues, organic solvents can pose a number of environmental concerns, such as atmospheric and land toxicity. In many cases, conventional organic solvents are regulated as volatile organic compounds (VOCs). In addition, certain...
February 1, 2010
A survey of tower failures [ 1 ] ranks kettle reboilers as the most troublesome reboiler type in the chemical process industries (CPI). Excessive pressure drop in kettle reboiler circuits is the prominent kettle malfunction, causing liquid to back up in the tower base beyond the reboiler return elevation. This high liquid level leads to premature flooding and capacity loss. In almost all the surveyed...
February 1, 2010
Researchers from the Center for Membrane Technology, Beijing University of Technology (China; have developed a new spiral-wound membrane module for use in oxygen-enriched combustion. A pilot-scale system with five membrane modules has been built and tested in a 4-ton, oil-fired boiler. According to the Center’s director, professor Shulan Ji, the fuel required to generate one 1 GJ...
October 6, 2009
The special group "Water and Wastewater Technology" of the German Process Plant and Equipment Association (VDMA; Frankfurt, Germany; has released a new VDMA Specification on prevention and reduction of scaling and fouling in membrane plants. The objective of this VDMA Specification is to help to ensure that measures are taken to prevent and reduce scaling and fouling when planning...
October 1, 2009
Bag filters for industrial applications have been in existence longer and are considered by some to be easier and simpler to specify than cartridges for a filtration project. And although cartridge filtration is now one of the mostly widely used filtration technologies in the chemical process industries (CPI), it is not always the first choice. How does one decide which filtration method should be used...
September 17, 2009
In an agreement with Raschig GmbH (Ludwigshafen, Germany) announced Sept. 16, UOP (Des Plaines, Ill.) has acquired exclusive rights to offer Super-Pak equipment for all UOP process units worldwide, as well as...
August 1, 2009
Successful adsorber design requires information about certain adsorbent properties, including: adsorbent densities and void fractions; isotherms or other equilibrium data; and data on mass-transfer kinetics and fixed-bed dynamics. Here, these adsorbent properties are explained, along with corresponding equations. Densities and void Fractions Three densities are relevant: bulk, particle and solid. There are...
August 1, 2009
A team from the School of Chemical Sciences and Engineering, at the University of New South Wales (Sydney, Australia;, has developed a process for the micronization of insulin called Arise (Atomized Rapid Injection for Solvent Extraction). According to BioParticle Technologies Pty. Ltd. (BPT; Sydney;, the company marketing Arise, the technology offers...
July 1, 2009
“When you improve the efficiency or capacity of a product, it almost always can be used to improve the process economics with respect to investment costs or operating costs,” says Mark Pilling, manager of technology with Sulzer Chemtech (Tulsa, Okla.). To help processors do this, separation-technology providers strive to maintain a strong base of engineering expertise to assist customers in...
July 1, 2009
Advanced Membrane Technologies and Applications Edited by Norman N. Li. Wiley. 111 River St., Hoboken, NJ 07030. Web: 2008. 994 pages. $150.00. Reviewed by Peter S. Cartwright, Cartwright Consulting Co., Minneapolis, Minn. The crossflow-pressure-driven membrane separation technologies of microfiltration, ultrafiltration, nanofiltration and reverse osmosis have been commercially available for...
July 1, 2009
The Electric Power Research Institute (EPRI, Palo Alto, Calif.; has signed an agreement with Air Products (Allentown, Penn.; to support the company’s development of a ceramic ion transport membrane (ITM) for air separation. The membrane is being tested and scaled up under a cooperative agreement with the U.S. Dept. of Energy (DOE, Washington D.C....
June 1, 2009
A new correlation that matches most commercial trays The sieve tray has been in the distillation market place for many decades. It has been used extensively in distillation columns worldwide as a highly efficient vapor-liquid-contacting device. Many people have examined dry tray pressure-drop data for sieve tray decks and there have been several attempts to correlate these data. But the error of such...
April 1, 2009
Aqueous Recovery Resources, Inc. (ARR; Bedford Hill, NY;, has developed the Suparator, an oil/water separation system that involves no moving parts or media, for low operational costs and minimal maintenance. The separator (diagram) is based on the Bernoulli effect, whereby increased stream velocity in a fluid results in internal pressure reduction, which enables liquids of different...
April 1, 2009
With the exception of Oslo-type crystallizers, the main commercial crystallizers are agitated systems that use an agitator [agitated tank or draft-tube baffle (DTB)] or a circulation pump [forced circulation (FC) crystallizers]. In such systems, however, large crystals become damaged by the pump or impeller, which leads to the generation of fines, says Michel Malfand, president of Crystal Evap consult...
March 1, 2009
Membrane polymers are packaged into a configuration, commonly called a device or an element. The most-common element configurations (figure) are tubular, capillary fiber, spiral wound, and plate and frame. Tubular Made from ceramic, carbon, stainless steel or a number of thermoplastics, tubular elements have inside diameters from ¼ in. up to about 1 in. Typically, the membrane is coated on the...
February 13, 2009
Coalescers of type Phase Separator PT 800 and PT 500 were developed for an application to separate micro droplets of hydrochloric acid from silicone oil, and vise versa. The pressure vessels are made of carbon steel with an...
February 12, 2009
CeraMem ceramic membranes are a proprietary technology platform provides ceramic membrane performance at comparable lifecycle costs to polymeric membranes. The design, which is a combination of unique materials of...
February 12, 2009
Septron Bio-Safe is said to be the world’s first electro-deionization (EDI) module with an integrated membrane stage. It is based on proven and patented spiral-wound technology and has an additional membrane stage for removal of...
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