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Polymer electrolyte fuel cell
PATENTS atoms and/or an aromatic hetero-cycle (optionally substituted) with 5-10 carbon atoms and comprising one or several hetero-atoms selected among S, N and O. Here C 1 and C 2 are formed with the neighbouring imide group cycles with 5 or 6 atoms. Groups Ar I and Ar 2 can be identical or different and represent a divalent group comprising at least a carbonaceous aromatic cycle (optionally substituted) with 6-10 carbon atoms and/or an aromatic heterocycle (optionally substituted), with 5-10 carbon atoms and comprising one or several heteroatoms selected among S, N and O. At least one of the Are carbonaceous aromatic cycles or hetero-cycle is substituted by a sulfonic acid group. The invention also concerns a membrane containing the sulfonated polyimide, and a fuel cell device comprising at least one of the membranes. Patent number: W O 01/25312 Inventors: M. Pineri, G. Gebel, N. Cornet, E Jousse, R. Mercier Publication date: 12 April 2001
and a 'substituent' chamber along the longitudinal extension of the housing. A partition wall encompasses each hollow-fibre membrane, and extends essentially cross-wise in relation to the hollow-fibre membranes, and essentially consists of a dimensionally stable material. The dialysate chamber and the substituent chamber are provided with at least one opening, respectively, for channeling a fluid in or out. At least one throttle is arranged in the outer chamber, to connect the dialysate and substituent chambers to each other. Patent number: W O 01/24849 Inventor: U. Baurmeister Publication date: 12 April 2001
electrostatic field and is found to reduce biofilm formation, thereby enhancing the performance of the membrane separation system. The application of high-voltage electrostatic fields is also found to reduce corrosion of metallic surfaces in the system. Patent number: W O 01/26768 Inventor: R.EV. Romo Publication date: 19 April 2001
Polymer electrolyte fuel cell Applicant: Matsushita Electric Industrial,
Japan
A polymer electrolyte membrane (PEM) fuel cell and a production method for such fuel cells are the subject of this patent. The fuel cell is Separation of a gas mixture provided with a membrane-electrode assembly Applicant: David Systems Technology, Spain (MEA) that consists of a PEM and a pair of The membrane described here is based on catalyst-carrying porous electrodes sandwiching asymmetric hollow fibres, obtained from the membrane, with a conductive separator on polyethersulfur for pervaporation purposes, the outer surface of the MEA. For a porous and treated with mixtures of liquids where electrode (with good air permeability) a reactiontoluene, acetone and dimethylformamide have gas leakage may occur from its end portion to a content between 7% and 12% by volume of : the outside of the separator. For this reason it is the mixture, and further treated using a general practice to provide a resin sealing portion Separation of a multi-component solution at 2.5% by volume of urethane (formed by impregnating and heat-curing a liquid medium siloxane in isopropyl alcohol. thermosetting resin material) at the peripheral Applicant: M.A Egorov, Russia edge of the porous electrode, However, this This separator includes a drum mounted on a Patent number: W O 01/07148 arrangement makes it difficult to maintain hollow shaft and provided with a set of conical Inventors: R. Blach Vizoso, A. Kotenko, sufficient sealing because of the shrunken resin plates which are installed on a plate support, as D. Amirkhanov, M. Tulsky, V. Fateev material volume, and solvent vaporization that is well as a device for pre-filtering the initial multi- Publication date: 12 April 2001 component liquid medium. A pressure disc, encountered when a resin-sealing portion is located in the base of the separator, is used to Water purification formed. This sealing performance problem is evacuate the fine solid fraction; another pressure Applicant: Kiwa NV, The Netherlands resolved by injection-moulding or pressdisc, located in the annular chamber under the This invention relates to a method for purifying moulding thermoplastic resin to the MEA edge, lid of the drum, is used to evacuate the coarse water by means of membrane filtration, in press-fitting resin to the inside of the porous solid fraction. The plates are assembled on the which a suspension of particles of a filtration electrode edge, and forming a gas seal covering plate support so that the broader base is turned aid, which forms a deposit layer on the the membrane extending outwards from the upwards. A space for slime, extending between membrane, is added to the water. The edge of the porous electrode. the edge of the plate set and the wall of the membrane is periodically cleaned to at least Patent number: W O 01/29921 drum, is in communication with this annular partially remove the deposited layer of filtration Inventors: S. Kobayashi, M. Hosaka, T. Kanbara space. The pre-filter device consists of a conical aid in which the pollutants are caught. The Publication date: 26 April 2001 shroud, whose lower part is located in the outlet filtration aid is only added during the period of the feeding tube and whose higher part is between the times in which the membrane is Magnesium production attached to the wall of the annular chamber and cleaned, and is added in a relatively high Applicant/Inventor: O , L Maddan (USA) to the membrane filter which is mounted inside concentration. The method of the invention A system is described for producing elemental the plate support. makes possible a stable process operation at high magnesium from sea water using a cell with a Patent number: W O 01/24938 flux, which can be used for the ultrafiltration of pair of permeable membranes, which define an Inventor: E.I. Asriev highly polluted water. anode compartment containing an anode and a Publication date: 12 April 2001 Patent number: W O 01/27036 cathode compartment containing a cathode. A Inventors: G. Galjaard, P.J. Buijs space is provided between the pair of Haemo-diafiltration of blood Publication date: 19 April 2001 membranes, through which sea water is allowed Applicant: Akzo Nobel, The Netherlands to flow freely. A source of electric current is This invention relates to a membrane module for Electrostatic enhancement for connected to the anode and cathode to charge haemo-diafiltration. The module comprises a membrane-separation systems the compartments, in order to cause ions within cylinder-shaped housing and a bundle of hollow- Applicant: M.M. Pitts, USA the sea water to pass from the space into the fibre membranes through which a liquid can A high-voltage electrostatic device is used to compartments where positive and negative ions flow. The bundle is oriented in the direction of improve the performance of membrane are separated. The electric charge associated with the longitudinal extension of the housing. The separation processes, particularly reverse- the cathode causes the sea water to decompose ends of the hollow-fibre membranes are osmosis units, where species of a given ionic into H 2 and (OH-)2, and positively charged embedded in casting compounds connected to polarity are separated from water. The device is magnesium ions within the sea water pass the inner wall of the housing. The outer immersed in the water flowing across the through the cathodic permeable membrane to chamber, which is configured around the membranes and is operated continuously at very combine with the (OH-) 2 to form magnesium hollow-fibre membranes (and is defined by .the high voltages, preferably greater than 30 kVa. hydroxide precipitates. casting compounds as well as the inner wall of The charge on the wetted surface of the Patent number: W O 01/29287 the housing), is divided into a dialysate chamber suspended particles is altered by the generated Publication date: 26 April 2001
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and a 'substituent' chamber along the longitudinal extension of the housing. A partition wall encompasses each hollow-fibre membrane, and extends essentially cross-wise in relation to the hollow-fibre membranes, and essentially consists of a dimensionally stable material. The dialysate chamber and the substituent chamber are provided with at least one opening, respectively, for channeling a fluid in or out. At least one throttle is arranged in the outer chamber, to connect the dialysate and substituent chambers to each other. Patent number: W O 01/24849 Inventor: U. Baurmeister Publication date: 12 April 2001
electrostatic field and is found to reduce biofilm formation, thereby enhancing the performance of the membrane separation system. The application of high-voltage electrostatic fields is also found to reduce corrosion of metallic surfaces in the system. Patent number: W O 01/26768 Inventor: R.EV. Romo Publication date: 19 April 2001
Polymer electrolyte fuel cell Applicant: Matsushita Electric Industrial,
Japan
A polymer electrolyte membrane (PEM) fuel cell and a production method for such fuel cells are the subject of this patent. The fuel cell is Separation of a gas mixture provided with a membrane-electrode assembly Applicant: David Systems Technology, Spain (MEA) that consists of a PEM and a pair of The membrane described here is based on catalyst-carrying porous electrodes sandwiching asymmetric hollow fibres, obtained from the membrane, with a conductive separator on polyethersulfur for pervaporation purposes, the outer surface of the MEA. For a porous and treated with mixtures of liquids where electrode (with good air permeability) a reactiontoluene, acetone and dimethylformamide have gas leakage may occur from its end portion to a content between 7% and 12% by volume of : the outside of the separator. For this reason it is the mixture, and further treated using a general practice to provide a resin sealing portion Separation of a multi-component solution at 2.5% by volume of urethane (formed by impregnating and heat-curing a liquid medium siloxane in isopropyl alcohol. thermosetting resin material) at the peripheral Applicant: M.A Egorov, Russia edge of the porous electrode, However, this This separator includes a drum mounted on a Patent number: W O 01/07148 arrangement makes it difficult to maintain hollow shaft and provided with a set of conical Inventors: R. Blach Vizoso, A. Kotenko, sufficient sealing because of the shrunken resin plates which are installed on a plate support, as D. Amirkhanov, M. Tulsky, V. Fateev material volume, and solvent vaporization that is well as a device for pre-filtering the initial multi- Publication date: 12 April 2001 component liquid medium. A pressure disc, encountered when a resin-sealing portion is located in the base of the separator, is used to Water purification formed. This sealing performance problem is evacuate the fine solid fraction; another pressure Applicant: Kiwa NV, The Netherlands resolved by injection-moulding or pressdisc, located in the annular chamber under the This invention relates to a method for purifying moulding thermoplastic resin to the MEA edge, lid of the drum, is used to evacuate the coarse water by means of membrane filtration, in press-fitting resin to the inside of the porous solid fraction. The plates are assembled on the which a suspension of particles of a filtration electrode edge, and forming a gas seal covering plate support so that the broader base is turned aid, which forms a deposit layer on the the membrane extending outwards from the upwards. A space for slime, extending between membrane, is added to the water. The edge of the porous electrode. the edge of the plate set and the wall of the membrane is periodically cleaned to at least Patent number: W O 01/29921 drum, is in communication with this annular partially remove the deposited layer of filtration Inventors: S. Kobayashi, M. Hosaka, T. Kanbara space. The pre-filter device consists of a conical aid in which the pollutants are caught. The Publication date: 26 April 2001 shroud, whose lower part is located in the outlet filtration aid is only added during the period of the feeding tube and whose higher part is between the times in which the membrane is Magnesium production attached to the wall of the annular chamber and cleaned, and is added in a relatively high Applicant/Inventor: O , L Maddan (USA) to the membrane filter which is mounted inside concentration. The method of the invention A system is described for producing elemental the plate support. makes possible a stable process operation at high magnesium from sea water using a cell with a Patent number: W O 01/24938 flux, which can be used for the ultrafiltration of pair of permeable membranes, which define an Inventor: E.I. Asriev highly polluted water. anode compartment containing an anode and a Publication date: 12 April 2001 Patent number: W O 01/27036 cathode compartment containing a cathode. A Inventors: G. Galjaard, P.J. Buijs space is provided between the pair of Haemo-diafiltration of blood Publication date: 19 April 2001 membranes, through which sea water is allowed Applicant: Akzo Nobel, The Netherlands to flow freely. A source of electric current is This invention relates to a membrane module for Electrostatic enhancement for connected to the anode and cathode to charge haemo-diafiltration. The module comprises a membrane-separation systems the compartments, in order to cause ions within cylinder-shaped housing and a bundle of hollow- Applicant: M.M. Pitts, USA the sea water to pass from the space into the fibre membranes through which a liquid can A high-voltage electrostatic device is used to compartments where positive and negative ions flow. The bundle is oriented in the direction of improve the performance of membrane are separated. The electric charge associated with the longitudinal extension of the housing. The separation processes, particularly reverse- the cathode causes the sea water to decompose ends of the hollow-fibre membranes are osmosis units, where species of a given ionic into H 2 and (OH-)2, and positively charged embedded in casting compounds connected to polarity are separated from water. The device is magnesium ions within the sea water pass the inner wall of the housing. The outer immersed in the water flowing across the through the cathodic permeable membrane to chamber, which is configured around the membranes and is operated continuously at very combine with the (OH-) 2 to form magnesium hollow-fibre membranes (and is defined by .the high voltages, preferably greater than 30 kVa. hydroxide precipitates. casting compounds as well as the inner wall of The charge on the wetted surface of the Patent number: W O 01/29287 the housing), is divided into a dialysate chamber suspended particles is altered by the generated Publication date: 26 April 2001
umllll MembraneTechnologyNo. 137
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