Pervaporation of water-ethanol mixtures

Pervaporation of water-ethanol mixtures

CALENDAR Events Calendar 26-30 August 2001 Symposium on Advanced Materials for Membrane Separations Chicago, Illinois, USA Contact: Dr Benny Freeman,...

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CALENDAR

Events Calendar 26-30 August 2001 Symposium on Advanced Materials for Membrane Separations Chicago, Illinois, USA Contact: Dr Benny Freeman, North Carolina State University,Chemical Engineering Department, Suite 3100, Partners II Building, 840 Main Campus Drive, Box 7265, Raleigh,NC 27606, USA. Tel: +1 919 515 2460 Fax: +1 919 513 3545 Email: benny [email protected]

9-13 September2001 International Conference on Membrane Ye~nolo~ for Wastewater Reclamation & Reuse Tel Aviv, Israel Contact: Gideon Oron, Ben-Gurion University of the Negev, Blaustein Institute for Desert Research, Environmental Water Resources,Kiryat Sde-Boker 84990, Israel. Tel: +972 7 659 6901 Fax: +972 7 659 6909 Email: [email protected]

http:llwww.membranext.com

9-14 September2001 Using Membranes to Assist in Cleaner Processes, EMS XVIII

S u m m e r School 2001 Tel Aviv, Israel Contact: Anna Trusek-Holownia, Institute of Chemical Engineering, Wrodaw University of Technology, Norwida 4/6, 50-373 Wroclaw, Poland. Tel: +48 71 320 3814 Fax: +48 71 328 1318 Email: [email protected] or [email protected]

10-12 September2001 Conference on Better Processes for Better Products Brugge, Belgium Contact: TraceyWheeler, BHR Group Ltd, Fluid Power Engineering Centre, Cranfield MK43 0AJ, UK. Tel: +44 1234 750422 Fax: +44 1234 750074 F.mail:[email protected]

11-12 September2001 M e m b r a n e Technology in W a t e r Purification & Wastewater Treatment Aachen, Germany Contact: Contact: Dr-lng Klaur Vossenkaul,Turmstrasse46, D-52056 Aachen, Germany. Tel: +49 241 80 54 81 Fax: +49 241 888 8252

Pervaporation of water-ethanol mixtures

Email: [email protected] http://www.ivt.rwt~h-aachen.de

11-13 September2001 7th Grove Fuel Cell Symposium & Exhibition London, UK Contact: Sarah Wilkinson, 7th Grove Fuel Cell Symposium Secretariat, ElsevierScience Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, UK. Tel: +44 1865 843691 Fax: +44 1865 843958 Emaih [email protected]

http://www.grovefuelcell.com

12-14 September2001 Water & WasteTechAsia 2001 Exhibition Singapore Contact: Water & WasteTechAsia 2001, Events Production Division, Singapore International Convention & Exhibition Centre, 1 Raffles Boulevard, Suntec City, Singapore 039593. Tel: +65 825 2264 Fax: +65 339 2937 Email: [email protected] http://www.waterwastetechasia.com

2-3 October2001 Mastering Membranes in the Food Industry

&P value to ~760 (95 wt% EtOH, 50°C). All types of IPN membranes exhibit a marked The separation properties in the dehydration of increase in both 0: and Pwhen the temperature a water/ethanol mixture and the s w e l l i n g increases from 25°C to 60°C. behaviour of inter-penetrating polymer network A.L. Buyanov, L.G. Revel'Skaya, Y.P. Kuznetzov, (IPN) pervaporation membranes based on a A.K. Khripunov: jr. of'A?p/ied Po/yrner Science cellulose or cellulose-hydroxyethyl cellulose 80(9) I452-1460 (31 May 2001). (HEC) matrix and poly(acrylamide and/or Dynamic enzymatic resolution of acrylic acid) were investigated, depending on the Naproxen methyl ester in a ionic acrylate groups content (T) in synthetic membrane bio-reactor polymer chains (0-100 mol%), the HEC content in the matrix (0-50 wt%), and the A ]ipase-catalysed enantioselective continuous hydrolysis process under in situ 'racemization' temperature (25-60°C). The separation factor of a substrate using sodium hydroxide as (o0, permeation rate (~, and separation index catalyst was developed for the production of (0~P) significantly improved with increasing 7 (S)-Naproxen from racemic Naproxen methyl values only for the separation of concentrated ester in an aqueous-organic bi-phase system. ethanol solutions (86 wt%). For more dilute Use of a tubular membrane in the stirred tank solutions of ethanol (-46 wt%), the P and czP reactor to separate the chemical catalytic values also increased but no considerable racemization and bio-catalytic resolution increase in 0: was observed. All types of processes, served to avoid the key problem membranes, based on the cellulose matrix, were associated with conventional dynamic characterized by a dramatic decrease in the resolution, namely the incompatibility of in values of P at [EtOH] _> 90 wt% and, as a result, situ chemical racemization with the presence of a decrease in the separation index (kg/meh) from a bio-catalyst. To overcome product inhibition -2000 (for 86 wt% EtOH, 50°C) to -240 (for and to facilitate product recovery from the 95 wt% EtOH, 50°C), which correlates with a aqueous-organic emulsion containing decrease in the degree of membrane swelling. substrate and lipase, a hydrophilic porous The modification of the cellulose matrix by semi-permeable membrane was used in the introducing HEC into it makes it possible to stirred tank reactor. Greater than 60% considerably increase the membrane swelling in conversion of the racemate was obtained with concentrated EtOH solutions and, hence, the an enantiomeric excess of product greater than

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University of Melbourne, Australia Contact: Nell Willman, Food Science & Agribusiness,Institute of Land & Food Resources,University of Melbourne, Victoria 3010, Australia. Tel: +61 3 8344 4000 Fax: +61 3 8344 5104 Emaih [email protected]

14-19 October2001 Advanced Membrane Technology Conference Barga, Italy Contact: The United Engineering Foundation,Three Park Avenue, 27th Floor, New York, NY 10016-5902, USA. Tel: +1 212 591 7836 Fax: +1 212 591 7441 Email: [email protected] http://www.engfnd.org/engfnd/ 1bb,html

27-30 October2001 IDA World Congresson Desalination & Water Reuse Manama, Bahrain Contact: Patrida Burke, IDA Secretary General, International Desalination Association, PO Box 387, Topsfield, MA 01983, USA. Tel: +1 978 887 0410 Fax: +1 978 887 0411

96%. In addition, transformation of Candida rugosa lipase isoenzymes was observed in the reaction process. J.-Y. Xin, S. Li, Y. Xu, J. Chui, C. Xia: J. of Chemical Techno/o~), & giotechno/ogo, 76(6) 579-585 (June 2001).

Vanadyl ion-selective membrane electrode This research work found that tri-noctylphosphine oxide (TOPO) acts as an excellent ionophore for the vanadyl ion (VO2+). An electrode constructed using this ionophore and 2-fluoro-2-nitrodiphenyl ether as a solvent mediator in a poly(vinyl chloride) membrane matrix exhibited a near-Nernstian response to VO 2+ in the concentration range of 10-SM to 10 :M, with a slope of 29.5 mV per concentration decade in a solution containing 0.1M Na2SO 4. The limit of detection was I0 C'M. The electrode showed high selectivity for VO e~ over other cations, including the uranyl ion (UO,2+). Other phosphine oxides such as triphenylphosphine oxide and tribenzylphosphine oxide, as well as phosphonate and phosphate analogues responded weakly to VO 2+, indicating that the T O P O with the strong basicity of the P=O group was especially useful for constructing a VO-'+-selective electrode. D. Xu, T. Karsu: Electroanalysis 13(10) 868-871 (June 2001 ).

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