Abstract: The invention provides a sealing gasket for mounting in a passage (5) of a support plate (4) to surround the end of a tubular-shaped filter element (3) provided with at least one fluid flow channel (31), the channel lying within a flow section Sc, the gasket being constituted in the form of a sleeve: possessing a height h not less than the height hps of the passage (5) in the support plate (4); and presenting an overlap bore (15) for the filter element (3) defined between one end (16) of the sleeve and a shoulder (17) which co-operates with the other end of the sleeve to define a channel bore (19) for the fluid, the shoulder (17) possessing a surface for acting as an abutment for the terminal portion of the filter element and presenting dimensions that are adapted to extend outside the flow section Sc so as to avoid impeding fluid circulation, the overlap bore (15) being provided with a groove (28) adjacent to the shoulder (17) in order to allow the gasket to creep.

Abstract: The present invention concerns an inorganic nanofiltration membrane characterized in that it comprises: a titanium oxide macroporous support, one or several intermediate separation layers, an upper metal oxide nanofiltration separation layer.

Abstract: The invention concerns a device for tangential filtering of a fluid to be treated, comprising in a housing (2):

Abstract: The invention provides a membrane for cross-flow filtering of a fluid to be treated, said membrane comprising an inorganic rigid porous support defining at least one flow channel for the fluid to be treated flowing in a given direction, the surface of the channel being covered in at least one separator layer separating out from the fluid to be treated a fraction referred to as the permeate which passes through the layer and the support. According to the invention, the separator layer presents a thickness gradient that decreases in the flow direction of the fluid to be treated.

Abstract: The invention relates to an inorganic filter element comprising:a rigid inorganic porous support; andchannels classifiable into n categories where n.gtoreq.2, with all of the channels in each category having identical right cross-section, identical hydraulic diameter, and identical equivalent diameter, the shapes of the right cross-sections of the channels differing between categories.According to the invention, the channels of the various categories have:hydraulic diameters such that the ratios between any two hydraulic diameters lie in the range 0.75 to 1.3;right cross-sectional areas such that the ratios between any two right cross-sectional areas lie in the range 0.75 to 1.3; andequivalent diameters such that the ratio of the equivalent diameter over the hydraulic diameter of each channel is less than or equal to 2.

Abstract: An inorganic filter element for filtering a fluid medium in order to recover a filtrate, the filter element being of the type including an inorganic rigid porous support of cylindrical shape having a longitudinal central axis, and channels formed in the support parallel to its central axis and presenting respective surfaces each covered in at least one separator layer that is intended to come into contact with the fluid medium, and at least some "peripheral" ones of the channels. The channels have their centers situated on a circle that is coaxial about the central axis and present a peripheral wall situated facing the outside surface of the support and co-operating therewith to define a direct through passage for the filtrate, and at least one radial wall co-operating with the facing radial wall of an adjacent channel to define a partition, the walls being interconnected by connection fillets. The channels also have a transverse cross-section that is non-circular.

Abstract: The invention relates to an inorganic support obtained by sintering and intended to constitute a support for a filter membrane, the support comprising: an inorganic feedstock having a grain size greater than 20 .mu.m and constituted by a metal compound containing only one metal selected from the following metals: aluminum, silicon, and titanium; and an inorganic binder that reacts with the feedstock under the heat treatment conditions of the support in the range 1200.degree. C. to 1500.degree. C., so as to obtain a support having porosity greater than 25% and mechanical strength defined by ultimate bending stress for plane supports greater than 15 MPa, and by ultimate tensile stress for tubular supports greater than 5 MPa, without including a compound liable to create microcracks in the support.

Abstract: Mechanically strong and thermally/chemically-resistant composite nanofiltration membranes, well adapted for the separation of low molecular weight compounds, comprise a porous inorganic support substrate, the pore diameters of which ranging from 3 to 10 nm, this inorganic support substrate having a polymer membrane which comprises an elastomeric polyphosphazene densely deposited on at least one of the face surfaces thereof, the structural porosity of such polyphosphazene membrane ranging from 0.2 to 2 nm.

Abstract: Filterable liquid media are continuously filtered by circulating same in a closed circulation loop, to and tangentially through a filtration module provided therealong which confines at least one filtration membrane, e.g., a microfiltration, ultrafiltration or reverse osmosis membrane, and which includes a permeate outlet, and by adjusting the flowrate but not the driving pressure of circulating liquid medium, notably by means of an apertured and perforated rotating disc, as to establish a non-steady periodic pseudophysiological flow thereof, at least over the working face surfaces of the at least one membrane.

Abstract: The invention relates to a method of manufacturing permeable mineral membranes.The method of the invention is characterized in that a thin layer of gel of peptised hydroxide of at least aluminum is deposited on a permeable perous substrate and the resulting membrane is dried and fired at a temperature between 500.degree. and 1100.degree. C.The resulting membranes can be used for isotopic separation of gases or for filtration and ultrafiltration.