Abstracts of Recent Patents guidelines set by the World Health Organization for turbidity and microbiological content. Inventors:Robert E. Baumann and Lee Rozelle. Date of Publication: 13 November 1997. Liquid Purification
Air Filtration and Drying System for Waterborne Paint In WP9737779Optimum Air Filtration describes an automated air filtration and drying system including an energy and environmental management system for controlling, monitoring and supervising the operation and performance of the air filtration and drying system, a capture apparatus for capturing and controlling overspray, and a drying /curing control module for rapidly drying a painted article using a continuously filtered and dehumidified flow of recycled air. Inventor: Fred G. Scheufler, Richard D. Scheufler and William H. Bayard. Date of Publication: 9 October 1997. Drinking
Water Filtration System
In WP9747960 Puraq Water Systems Inc., describes a process and apparatus for producing purified drinking water from surface or ground fresh water sources using no chemical pre-treatment or coagulants, by usage of a positivelycharged filtration media to attract the typically negatively-charged suspended solids present in the water source. The process, which can be portable, includes a filtration system having a filtration/recirculation/backwash component and a disinfection step. The process further includes a system controller which receives electrical signals from float controls to control the filtration, recirculation, and backwash steps. This process produces drinking water which meets or exceeds the
and Gas and Filtration
In WP9743028 Axholme Resources Ltd describes a material comprising a base formed substantially of cellulose fibres onto which is adsorbed a composition comprising one or more aliphatic carboxylic acids having hydrocarbon chains consisting of 8 to 20 carbon atoms, and a filter material comprising a matrix in which is dispersed a granular formulation of this material. The material can be used to adsorb hydrocarbon pollutants, such as oil spills, and the filter material can be used to adsorb such pollutants from a fluid stream. Inventor: Andrew B. Haynes. Date of Publication: 20 November 1997. Crossflow Filtration Process for Separating Organic Compounds In EP0804960 Degussa Aktiengesellschaft describes a process for separating water-soluble organic compounds from an aqueous solution. The process involves adsorbing a fraction of the compounds on a finely divided inorganic solid adsorbent and separating the loaded adsorbent by cross-flow filtration on a porous membrane. The process comprises (a) mixing the solution with adsorbent to form a suspension; (b) passing the suspension over the top of the membrane; (c) establishing a pressure differential between the top and bottom of the membrane so that a filtrate depleted in adsorbed compounds flows through the membrane; (d) separating unadsorbed compounds from the filtrate; and (e) recycling the suspension, optionally after removing all or part of the adsorbent, to remove any residual unadsorbecl compounds. Inventors: Gunter
Weiss/and, GBrard Richet and Stefan Stockhammer. Date of Publication: 5 November 1997. Separation of Dust Particles from Exhaust Gases In WP9740915 Gluscic describes a mechanical device for separating dust particles from exhaust gases under conditions of high temperature and high moisture. The device enables the recycling of the separated dust and operates on the principle of conducting the medium through a centrifugal field which causes the radial exhausting of dust particles. The carrying medium along with the dust particles axially enters a rotating cylinder through a feed tube. The cylinder is divided into many sections with shovels. The forced rotation of the medium in the cylinder causes the settling of the dust particles onto the cylinder wall. The ratio between the rotor length, its cross section and the medium flow defines the particle stay duration in the centrifugal field. The effectiveness of the filtration is conditioned by the time of stay. The cleaned medium is conducted from the mid cylinder part into the outlet tube. The separated particles are conducted along the cylinder wall into the outlet tube for exhausting and recycling the unwanted dust. The rotor for the dust particle separation can be constructed as a cylinder or a cone. Inventor: lztok Potrc, Gluscic. Date of Publication: 6 November 1997. A Process for Producing Meltblown Polyolefin Fibres for Mechanical Filtration In WP97434 70 Web Dynamics Ltd describes a process for producing meltblown polyolefin fibres having an effective diameter of less than 5 microns, comprising providing a polyolefin having a melt flow index of at least 1000, mixing a fluorocarbon with the polyolefin in order to increase the melt flow index
of the polyolefin to at least 2000, and meltblowing the polyolefin with the fluorocarbon in order to produce the meltblown polyolefin fibres. The polyolefin being such that during the meltblowing the fluorocarbon is able to migrate to the surface of the formed polyolefin fibres without the need for a separate annealing step. Inventor: Timothy J. Woodbridge and Roland A. Griffin. Date of Publication: 20 November 1997. Ultra-Filtration Vacuum System In WP9739818 Miracle Marketing Corporation describes a system for extracting small particulate dust from air using a twostage air handling system with a particulate entrapment fluid in the two stages, and a solid cartridge filter medium. The first stage has a cyclone for removing large debris and the second stage has a dispersion chamber nestled inside the top of the first stage wherein air is injected directly into the liquid filter medium through spiral vanes contoured such that the surface of the swirling fluid is made to tumble due to the cascading action. A third stage has a mechanical medium filtration system provided to remove fine particulate matter. Inventors: Michael J. Edgington and Guy M. Hatch. Date of Publication: 10 October 1997. Process for l-tydrogen Fluoride Separation In WP9743208 Allied Signai Inc., describes a method for separating hydrogen fluoride from a chemical mixture by contacting the mixture to a hydrogen fiuoride binder. The separated hydrogen fluoride may be recovered from the hydrogen fluoride binder. The binder is a synthetic water-soluble polymer, preferably sodium polyacrylate. inventors: Hang Pham, Charles Redmon, Rajiv Singh, Robert Pratt, Jeffrey McKown and Mathew Lucy Date of Publication: 20 November 1997.