Polymeric membranes

Polymeric membranes

PATENTS Patents Selectively permeable composite membrane structures Applicant: Compagnie d’Etude des Techniques de l’Hydrogene, France This invention...

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Patents Selectively permeable composite membrane structures Applicant: Compagnie d’Etude des Techniques de l’Hydrogene, France This invention relates to a composite structure that consists of a relatively long filtration bar. From the outside inwards, it comprises an ultrathin layer that is selectively permeable to hydrogen and made from palladium or silver alloy. This layer is disposed on a permeable, rigid, refractory substrate consisting of a more or less solid body which is covered with an intermediary thin layer that has a relatively smooth surface. The body and the intermediary layer are made, respectively, by sintering with fine and ultra-fine Inconel grains. A rigid metallic axial structure is embedded in the body. Veinlets, which are made in the body through the destruction of thermodestructible wires during sintering, increase the permeability of the substrate. The resulting composite membrane structure is particularly applicable in hydrogen-producing combustible gas processors. Patent number: WO 02/066144 Inventors: C. Etievant, F. Gaillard, D. De Lapparent, R. Le Cren, K. Pointet Publication date: 29 August 2002

Filter body Applicant: AAflowsystems GmbH & Co Kg, German This invention describes a method for producing a membrane filter body. It comprises the following steps: at least one porous functional layer that is made of zeolitic particles is provided. A liquid is applied to this functional layer, containing precursors suitable for forming a zeolite. The functional layer and the liquid are subjected to pressure and a specific temperature in order to form a closed molecular screening layer. Patent number: WO 02/066141 Inventors: S. Benfer, D. Bläse, H.-P. Feuerpeil, J. Hoffmann, H. Olapinski, B. Seling, G. Tomandl Publication date: 29 August 2002

Electrocatalytic composition Applicant: De Nora Elettrodi SpA, Italy An oxygen-depolarized cathode for aqueous hydrochloric acid electrolysis membrane cells is the subject of this patent. The cathode is placed in contact with the membrane, and is capable of preventing the release of hydrogen into oxygen even at the highest current densities. The hydrochloric acid may also be of technical grade with a concentration limited to 15%, while the operating temperature must not exceed 60°C. The cathode contains a mixture of rhodium sulphide and a metal of the platinum group that is applied in a single layer, or alternatively it is applied separately in two distinct layers.

Membrane Technology October 2002

Patent number: 6 September 2002 Inventors: N.G. Martelli, F. Fulvio Publication date: WO 02/068722

Membrane separation for sulphur reduction Applicant: W.R. Grace & Co–Conn, USA A membrane process for the removal of sulphur species from a naphtha feed, in particular, a FCC light cat naphtha, without a substantial loss of olefin yield is disclosed. The process involves contacting a naphtha feed stream with a membrane having sufficient flux and selectivity to separate a sulphur-deficient retentate fraction from a sulphur-enriched permeate fraction, preferably, under pervaporation conditions. Sulphur-enriched permeate fractions contain aromatic and non-aromatic hydrocarbons and are further treated with conventional sulphur removal technologies, for example, hydro-treating, to reduce the sulphur content. The process described in this invention provides high quality naphtha products having a reduced sulphur content and a high content of olefin compounds. Patent number: WO 02/068568 Inventors: S.L. White, R.F. Wormsbecher, M. Lesemann Publication date: 6 September 2002

Cleaning system for membrane modules Applicant: VA Tech Wabag Deutschland GmbH & Co Kg, Germany A method and a associated system for cleaning membrane modules has been developed. It is designed to be used in a water treatment plant. According to method, the membrane modules are transferred from the water treatment plant into a cleaning container, in which they are chemically cleaned. This container is sealed once after at least one module has been introduced, and a cleaning programme is carried out. This cleaning programme includes a step that involves mechanically cleaning the membrane module by spraying it with a cleansing agent. This is normally carried out before the chemical cleaning step. In this was the membranes are cleaned in a simple manner with minimal use of chemicals and negligible production of waste material. Patent number: WO 02/068102 Inventors: A. Kraft, H. Kohl, F. Klegraf Publication date: 6 September 2002

Polymeric membranes Applicant: Gradipore Ltd, Australia A polymer membrane suitable for use in electrophoresis is formed from a pre-polymer having a larger number of crosslinkable moieties. These moieties are crosslinked with a polyfunctional crosslinking agent. Patent number: WO 02/068100 Inventors: K.H. Purss, M.J. Caulfield, D.H. Solomon Publication date: 6 September 2002

Membrane reactor for gas extraction Applicant/Inventor: R.E. Buxbaum The membrane reactor that is presented in this invention generates a desired gas such as hydrogen. This is produced by steam reforming liquid fuels. The membrane reactor provides thermal integration between the heating source and the reaction catalyst by heat conduction through a solid medium. A gas purification system extracts energy from the waste gases to heat the membrane reactor. Patent number: WO 02/068092 Publication date: 6 September 2002

Hydrophobic composite palladium membrane catalyst Assignee: Council of Scientific & Industrial Research, USA A hydrophobic composite palladium-membrane catalyst, useful for the nonhazardous direct oxidation of hydrogen by oxygen to hydrogen peroxide (without a gas phase mixing of hydrogen and oxygen or air) has been developed. It is ‘described’ by the general formula: HPM (c)/SOMF (b)/Mx Pd1–x (a)/IPM. The patent explains the various parts of this formula as follows: IPM is an inorganic porous membrane; Mx Pd1–x is a metal alloy, permeable only to hydrogen gas; Pd is palladium metal; M is a metal other than palladium, or a mixture of two or more metals; x is a mole fraction of the metal M in the metal alloy (Mx Pd1–x), a is the weight of the metal alloy per unit area of IPM; SOMF is a surface oxidized thin metal film comprising palladium; b is a thickness of SOMF; HPM is a hydrophobic polymer membrane; and c is a weight of the HPM per unit area of SOMF. A process for producing the catalyst is detailed in the patent. Patent number: US 6448199 Inventors: V.R. Choudhary, S.D. Sansare, A.G. Gaikwad Publication date: 10 September 2002

Polymer membrane production Applicant: Celanese Ventures GmbH, Germany The invention relates to a polyazole based aciddoped polymer membrane. It also provides details of a method for the production and the use of this membrane. The acid-doped polymer membrane can be used in a variety of ways on account of its excellent mechanical properties. The patent claims that it is especially suitable for use in polymer-electrolyte-membrane fuel cells. Patent number: WO 02/071518 Inventors: O. Uensal, J. Kiefer, J. Baurmeister, J. Pawlik, W. Kraus, F. Jordt Publication date: 12 September 2002

Multi-membrane filter Assignee: Siemens Westinghouse Power Corp, USA A filter element that is made up of a large number of membrane layers is the subject of this