- Email: [email protected]
Vanadyl ion-selective membrane electrode
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
MembraneTechnologyNo. 136
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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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
MembraneTechnologyNo. 136
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 ).
(~