PROCESS OF PURIFYING GYPSUM Grone Diete Frankfurt am Main, GERMANY assigned to Metallgesellschaft Aktiengesellschafl The process for purifying gypsum suspensions, particularly those formed in a flue gas desulfurizing plant, includes feeding the gypsum suspension to a fast hydrocyclone, which is operated to produce an underflow with a comparatively high underflow concentration and an overflow fed to a collecting tank. The underflow of the first hydrocyclone stage is further diluted to a form another underflow with a lower solids content in a suspension tank and then is fed to a second hydrocyclone stage, the overflow of which is also fed to the collecting tank. Depending on purity of the gypsum required or attained, the gypsum contained in an underflow of the second hydrocyclone stage is either immediately dewatered and removed or is fmt fed to one or more hydrocyclone stages, which operate analogously. The combined ovetfIows of the fmt and second or further hydrocyclone stages are fed from the collecting tank to a third hydrocyclone stage. In a thickener solid particles are removed from the overflow of the third hydrocyclone and the clear effluent, which is an overflow from the thickener, is used for diluting in the suspension tank .
METHOD FOR STRIPPING CONFORMAL COATINGS FROM CIRCUIT BOARDS
The throughdryability of dewatered, but wet, sheets made from papermaking fibers can be significantly increased by subjecting an aqueous suspension of the fibers at high consistency to elevated temperatures with sufficient working of the fibers. Such a treatment is particularly effective for improving the efficiency of throughdrying processes used in the manufacture of certain products, such as tissues and paper towels, made from furnishes having a significant amount of secondary or recycled fibers.
ENERGY AND WATER SAVING LAUNDRY SYSTEM Charlton, MA, UNITED STATES Carroll John D assigned to Hydrokinetics Inc An energy and water conservation laundry mechanism which includes a plurality of automatic washing machines, a rinse water storage tank, plumbing which connects the storage tank to the each of the washing machines, and electrical controls which are tied into the existing control circuitry of the washing machines for selectively directing the flow of rinse water between the storage tank and the washing machines. The plumbing includes pumps and valves which enables rinse water, as stored in the storage tank, to be delivered to each washing machine at the beginning of a wash cycle and waste water from the wash cycle to be discharged into a conventional sewer line. Rinse water from each washing machine at the end of each rinse cycle, is pumped to the storage tank for reuse for subsequent wash cycles of the machines. The invention also includes a filter for the rinse water which includes a toroidal shape filter element.
Evans Jeffrey J; Guth Leslie; Ray Urmi Milltown, NJ, UNITED STATES assigned to AT&T Corp In preparation for removing a protective adherent covercoat from a circuit board that is to be repaired, the surface integrity of the coating is altered (for example, by making incisions therein). Subsequently, the coated circuit board is subjected to supercritical carbon dioxide in a processing chamber. Following this process, the coating is easily lifted from the board.
METHOD OF TREATING PAPERMAKING FIBERS FOR MAKING TISSUE Hermans Michael A; Makolin Robert J; Goerg-Wood Kristin A; Chen Fung-jou Neenah, WI, UNITED STATES assigned to Kimberly-Clark Corporation
HYDROCARBONYLATION OF DIM-ETHYL ETHER Waller Francis J; Studer David Allentown, PA, UNITED STATES assigned to Air Products and Chemicals Inc Oxygenated acetyl compounds ethylidene diacetate, acetic acid, acetic anhydride, aceta!dehyde, and methyl acetate are produced directly from synthesis gas and dimethyl ether in a catalyzed liquid phase reaction system. The inclusion of carbon dioxide in the synthesis gas in selected amounts increases the overall yield of oxygenated [email protected]
compounds from the reactant dimethyl ether. When methanol is included in the reactor feed, the addition of carbon dioxide significantly improves the molar selectivity to ethylidene diacetate.
J. Cleaner Prod. Volume 4, Number