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Filter element
Abstracts of Recent Patents is used as the scrubbing agent. Date of publication: 8 May 1996. Cyclone-type fine screen device
Separating a solute from other solutes In GE 2294413 Croda International describes a method for separating a solute from one or more other solutes in a solution. It comprises solubilising the solute to be separated from the solution, and passing the insolubilised solute and the remaining solution in contact with a membrane. The insoluble particles cannot pass through the membrane filter, but the solute(s) remaining in solution pass through the membrane filter and are thus separated from the insoluble particles. This method is particularly suitable in the manufacture of N-acyl taurate derivatives, and especially in the manufacture of sodium N-cocoyl, N-methyl taurate. Date of publication: 1 May 1996. Temperature control scrubbing
in gas
In GB 2294647 L. Forbes describes a method by which ammonia in a gas stream is removed by a scrubber, the temperature of which is monitored by a sensor and used to reduce the ammonia supply as the temperature rises, whereby cooling is effected. The process may be applied to leakage recovery from a refrigeration unit wherein leaked liquid ammonia from a sump is vaporised and passed, with leaked gaseous ammonia and added air, via a damper to the scrubber. Air continues to flow when the damper is closed, enhancing the cooling. Sulphuric or citric acid
In GB 2294892 Beijing General Research Institute of Mining & Metallurgy describes a cyclone-type fine screen device. It comprises an overflow tube, a feed portion, a lower screen cylinder housing and a cone section. The invention is characterised by the screen cylinder having an integral cylindrical portion. The upper and lower flanges of the screen cylinder are respectively located at the cylindrical portion’s upper stopper and an upper stopper on the inner ring of the lower housing. The device has the advantage of a large load-screening ability, high grading efficiency, a compact structure, and a lower cost and energy consumption. The device is suitable for grading and concentrating for sodium hydroxide or other fine particulate materials. Inventors: Zhigang Fang and Fenggang Song, Date of publication: 15 May 1996. Filter assembly with filter element and sealing device In WO 96102314 Pall Corporation describes a filter assembly in which a ceramic tube filter may be preassembled with two sealing elements prior to installation. The preassembled filter assembly has an advantage in that the seal between the ceramic filter and the metal sealing device may be tested in the manufacturing stage prior to installation in the field. In addition, a tube sheet including filter assemblies ,according to the present invention may locate the filter assemblies closer together, thus reducing the pitch between the filter elements. Inventors: M.W. Johnson and D.W. Sutherland, Date of publication: 1 February 1996.
Separating liquid/liquid mixtures In WO 96/02316 the University of Queensland describes a method and apparatus for separating liquid/liquid mixtures such as temperature-sensitive mixtures. It converts the liquid mixture into a spray, and sprays the mixture against one side of a membrane. This process improves separation. Date of publication: 1 February 1996. Filter element In GB 2294648 BTR Plc describes a filter element which comprises two corrugated layers of filter media arranged superimposed to define elongated air flow passages. Between the corrugated layers there is an internal support structure which extends across a substantial part of the width and length of the element, to prevent direct contact between at least part of the corrugated layers. The internal support structure facilitates a structural interconnection of the layers of filter media to inhibit separation of the two layers when the pressure within the element exceeds the external pressure. The corrugated layers are structurally interconnected by adhesive at positions intermediate to the edges. Inventor: C.J. Mould, Date of publication: 8 May 1996. Processing a fluid by filtration In WO 96/12549 Moatti Filtration SA describes a fluid processing assembly including a filter with a device for periodically cleaning each filter element. There is a channel for discharging the used impurity-laden cleaning fluid. The processing assembly also includes a centrifugation device with a rotary chamber connected to a fluid inlet channel. The filter elements and the chamber are arranged in a single housing,
while the inlet channei 3s directly connected to the cleaning fluid discharge channel. A compact and reliable assembly is achieved. Inventors: T. Christophe and J.C. Moatti, Date of publication: 2 May 1996. Pressure-actuated radial air filter seal in WO 96/12550 Fleetguard lnc describes a seal for a cylindrical air filter. It includes a polyurethane member which is configured with two primary portions. One part is an annular body which is formed with an annular receiving channel which is sized to receive one end of a corresponding filter element. The other part is an annular sealing lip spaced relative to the receiving channel. This sealing lip includes a ribbed, radial-sealing surface and a convex, axialsealing surface. The radialsealing surface provides sealing contact with the outlet of the housing by tension, while axial sealing is achieved by compression of the axial-sealing surface against the generally planar surface of the housing. In addition to these two modes of sealing engagement, differential pressure forces cause the sealing lip to press tightly against the housing to enhance the sealing. Inventors: G. Mullins, Zemin Jiang and P. Piccirilli, Date of publication: 2 May 1996. Producing
NO,-free
gases
In WO 96/12551 Hoechst AG describes a filter material and process for producing NO,-free gases. Polyarylene ethers are used as the filter material to remove NO2 from gases and liquids. NO can also be removed in the presence of an oxidising agent with a redox potential of at least 0.96 V SHE. The filter material is used in producing NO*-free gases for medicine, for example. Inventors: A. Schleicher and G. Frank, Date of publication: 2 May 7996.
Separating a solute from other solutes In GE 2294413 Croda International describes a method for separating a solute from one or more other solutes in a solution. It comprises solubilising the solute to be separated from the solution, and passing the insolubilised solute and the remaining solution in contact with a membrane. The insoluble particles cannot pass through the membrane filter, but the solute(s) remaining in solution pass through the membrane filter and are thus separated from the insoluble particles. This method is particularly suitable in the manufacture of N-acyl taurate derivatives, and especially in the manufacture of sodium N-cocoyl, N-methyl taurate. Date of publication: 1 May 1996. Temperature control scrubbing
in gas
In GB 2294647 L. Forbes describes a method by which ammonia in a gas stream is removed by a scrubber, the temperature of which is monitored by a sensor and used to reduce the ammonia supply as the temperature rises, whereby cooling is effected. The process may be applied to leakage recovery from a refrigeration unit wherein leaked liquid ammonia from a sump is vaporised and passed, with leaked gaseous ammonia and added air, via a damper to the scrubber. Air continues to flow when the damper is closed, enhancing the cooling. Sulphuric or citric acid
In GB 2294892 Beijing General Research Institute of Mining & Metallurgy describes a cyclone-type fine screen device. It comprises an overflow tube, a feed portion, a lower screen cylinder housing and a cone section. The invention is characterised by the screen cylinder having an integral cylindrical portion. The upper and lower flanges of the screen cylinder are respectively located at the cylindrical portion’s upper stopper and an upper stopper on the inner ring of the lower housing. The device has the advantage of a large load-screening ability, high grading efficiency, a compact structure, and a lower cost and energy consumption. The device is suitable for grading and concentrating for sodium hydroxide or other fine particulate materials. Inventors: Zhigang Fang and Fenggang Song, Date of publication: 15 May 1996. Filter assembly with filter element and sealing device In WO 96102314 Pall Corporation describes a filter assembly in which a ceramic tube filter may be preassembled with two sealing elements prior to installation. The preassembled filter assembly has an advantage in that the seal between the ceramic filter and the metal sealing device may be tested in the manufacturing stage prior to installation in the field. In addition, a tube sheet including filter assemblies ,according to the present invention may locate the filter assemblies closer together, thus reducing the pitch between the filter elements. Inventors: M.W. Johnson and D.W. Sutherland, Date of publication: 1 February 1996.
Separating liquid/liquid mixtures In WO 96/02316 the University of Queensland describes a method and apparatus for separating liquid/liquid mixtures such as temperature-sensitive mixtures. It converts the liquid mixture into a spray, and sprays the mixture against one side of a membrane. This process improves separation. Date of publication: 1 February 1996. Filter element In GB 2294648 BTR Plc describes a filter element which comprises two corrugated layers of filter media arranged superimposed to define elongated air flow passages. Between the corrugated layers there is an internal support structure which extends across a substantial part of the width and length of the element, to prevent direct contact between at least part of the corrugated layers. The internal support structure facilitates a structural interconnection of the layers of filter media to inhibit separation of the two layers when the pressure within the element exceeds the external pressure. The corrugated layers are structurally interconnected by adhesive at positions intermediate to the edges. Inventor: C.J. Mould, Date of publication: 8 May 1996. Processing a fluid by filtration In WO 96/12549 Moatti Filtration SA describes a fluid processing assembly including a filter with a device for periodically cleaning each filter element. There is a channel for discharging the used impurity-laden cleaning fluid. The processing assembly also includes a centrifugation device with a rotary chamber connected to a fluid inlet channel. The filter elements and the chamber are arranged in a single housing,
while the inlet channei 3s directly connected to the cleaning fluid discharge channel. A compact and reliable assembly is achieved. Inventors: T. Christophe and J.C. Moatti, Date of publication: 2 May 1996. Pressure-actuated radial air filter seal in WO 96/12550 Fleetguard lnc describes a seal for a cylindrical air filter. It includes a polyurethane member which is configured with two primary portions. One part is an annular body which is formed with an annular receiving channel which is sized to receive one end of a corresponding filter element. The other part is an annular sealing lip spaced relative to the receiving channel. This sealing lip includes a ribbed, radial-sealing surface and a convex, axialsealing surface. The radialsealing surface provides sealing contact with the outlet of the housing by tension, while axial sealing is achieved by compression of the axial-sealing surface against the generally planar surface of the housing. In addition to these two modes of sealing engagement, differential pressure forces cause the sealing lip to press tightly against the housing to enhance the sealing. Inventors: G. Mullins, Zemin Jiang and P. Piccirilli, Date of publication: 2 May 1996. Producing
NO,-free
gases
In WO 96/12551 Hoechst AG describes a filter material and process for producing NO,-free gases. Polyarylene ethers are used as the filter material to remove NO2 from gases and liquids. NO can also be removed in the presence of an oxidising agent with a redox potential of at least 0.96 V SHE. The filter material is used in producing NO*-free gases for medicine, for example. Inventors: A. Schleicher and G. Frank, Date of publication: 2 May 7996.