Composite solid polymer electrode membranes

Composite solid polymer electrode membranes

Patent number: WO 99/10089 Inventor: M. Perry Publication date: 4 March 1999 Polyion complex separatiion membrane with double structure Applicant: Ko...

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Patent number: WO 99/10089 Inventor: M. Perry Publication date: 4 March 1999

Polyion complex separatiion membrane with double structure Applicant: Korea Research Institute of Chemical Technology The patent describes a polyion complex separation membrane wirh a dc’uble strucrure. It can be used in the pressurised reverse osmosis separation of a water-soluble mixture containing ions or particles - such as recovering expensive iomc organic materials like anionic emulsifiers - from wastewater. In particular, this membrane has an which is anionic polymer substrate, immersed into a carionic polymer solution containing a multivalent ion cross-linking agent. This leads to cros:s-linkage within the membrane, forming an ion complex between ionic polymers of opposire polarity ar rhe membrane surface, to yield a stable doublestructure membrane. Patent number: WO 99/10090 Inventors: J.M. Lee, C.K. Yeom, CU. Kim, B.S. Kim, K.J. Kim Publication date: 4 March I 999

Composite solid polymer electrolyte membranles Applicant: Foster-Miller Inc, USA The patent relates to composite solid polymer electrolyte membranes, which include a porous polymer substrate interpenetrated with an ionconducting materiai. Thsese membranes are useful in electrochemical applications, including fuel cells and electrodialysis. Patent number: WO 99/10 165 Inventors: R.M. Formato, R..R. Kovar, I? Osenar, N. Landrau Publication date: 4 March 1999

Polysulfone membralne Applicant: Akzo Nobel NV, The Netherlands A synthetic membrane is described that consists of a mixture of polysulfone and sulfonated polysulfone and nor more than 20 wt% of orher polymers, wirh the mixture containing 0.5-8 wt% sulFonated polysulfone, possibly as the salt of sulfonic acid. The patent describes a method for manufacturing this synthetic membrane, in which one or more solvents are added to a mixture of 0.5-8 wt% sulfonated polysulfone (possibly as the salt- of sulfonic acid), polysulfone and not more than 20 wt% of other polymers; tlhe mixture is dissolved to form a polymer solution, which is shaped and precipitated to form a membrane in a precipirating bath through the use of a precipitating agent. Patent number: US 5879554 Inventors: W. Loffelmann, J. Passlack, H. Schmitt, H.-D. Sluma, M. Schm tt Publication date: 9 March 1999

Membrane Technology No. 109

Production of inorganic nanoparticles

Polyimide semipermeable membrane

Applicant; CeraMem Corporation, USA The patent describes a process and system for the production of inorganic nanoparticles, by precipitating the inorganic nanoparticles using a precipitating agent from a microemulsion wirh a conrinuous and a non-continuous phase. The precipitated nanoparticles are concentrated using an ultrafiltration membrane. Patent number: US 5879715 (WQ 99/I 1243) Inventors: R.J. Higgins, R.L. Goldsmith Publication date: 9 March 1999 (11 March 1999)

Applicant: Nitto Denko Corporation, Japan A polyimide resin semipermeable membrane is described that has a continuous structure of a homogeneous skin layer (average thickness 5-1000 nm) and a porous layer in the same materials with rhe same thickness as the skin layer. The porous layer is formed by a void structure with an average hole diameter of less than 3 pm, resulting in a cost-effective gas separation membrane with high permeability. The membrane is formed by the following process. First, a solution is made by adding diethylene glycol dimethyl ether to polyimide, and then left for deaeration and adjusted. Then the filmforming solution is casr using an applicator onto a polyester nonwoven cloth, which serves as rhe support layer. The solution is finally soaked in water for 5 minutes to solidify the membrane. This resulrs in a semipermeable membrane comprising a homogeneous skin layer and a porous layer. Crosslinking silicone resin solution may be formed on the surface of the semipermeable membrane to form an overcoar. Patent number: US 5882382 Inventors: H. Hachisuka, K. Ikeda Publication date: 16 March 1999

Membrane electrode assembly Applicant: 3M Company, USA A membrane electrode assembly is described which comprises an ion-conducting membrane and one or more electrode layers formed from nanostructured elements (less than 1 pm long), which are in incomplete contact wirh the ionconducting membrane. The parent also describes methods for manufacture of the assembly. This membrane electrode assembly is suitable for use in elecrrochemical devices, including protonexchange membrane fuel cells, electrolysers, chlor-alkali separation membranes etc. Patent number: US 5879828 Inventors: M.K. Debe, R.J. Poirier, M.K. Wackerfuss, R.J. Ziegler Publication date: 9 March 1999

RO filter assembly Applicant: Hydranautics, USA A filter assembly and method of manufacture are described for separating particulates from a fluid stream. The filter assembly is made from a coaxial core tube with a spirally wound, composite polyamide &ration membrane. The assembly comprises endcaps with feed inlet, and concentrate and permeate outlet ports, and with an enclosure or shell that surrounds the endcaps and membrane to form a cylindrical chamber. Patent number: WO 99111361 Inventor: R.P. Hallmark Publication date: 11 March 1999

Porous ceramic structures Applicant: Pall Corporation, USA The manufacture of porous cermic structures such as membranes and filters from pre-ceramic polymer precursors, such as polyorganoborosilazanes, is described. The production process involves precipitating a pre-ceramic polymer from a casting solution, then pyrolysing rhe ceramic structure to form a porous ceramic. The method results in structures with a voids volume of greater than 50%. Potential applications for the porous structures include ultrafiltration and nanofihration. Patent number: WO 99/l 1582 Inventor.r: S.A. Geibel, A.K. Bhanot Publication date: 11 March 1999

Electrode formation on anion exchange membrane Applicant: United Technologies Corporation, USA The parent describes the formation of an electrode on a solid polymer anion exchange membrane, to increase reaction rates at the membrane’s reaction surface. The process involves soaking a polymer anion exchange membrane in a anionic solution containing a metal catalyst, so that anions containing the catalyst exchange into the membrane. The membrane is rhen exposed to a reducing agent, to reduce rhe metal catalyst to a metallic form physically secured at rhe membrane reaction surface, thus forming an electrode adjacent the reaction surface; this is followed by rinsing in distilled water. These steps are repeated unril the desired catalyst loading is achieved. Several options are described, including an anion membrane exchange TFE-FEP of (tetrafluoroethylene-fluorinated ethylene propylene), using anionic chloroplatinic acid and sodium borohydride as the reducing agent; and a polyolefin exchange membrane, using anionic potassium retrachloroplatinate and the same reducing agent. Patent number: WO 99112659 Inventor: J.R. Dube Publication date: 18 March 1999

Separation module using porous membrane elements Applicant: Tsuchiya Mfg Co Ltd, Japan The patent describes an improved separation module for separation and filtration of micro-

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