Abstract: A method for deinking of repulped xerographic paper comprising adding an organic polymeric particulate and a substantially water insoluble organic ester to a repulped aqueous slurry containing xerographic toner particles in an amount sufficient to at least partially agglomerate the xerographic toner particles within the slurry to larger particle sizes; and removing the xerographic toner particles from the slurry by one or more liquid/solid separation techniques.

Abstract: A process for improving the freeness of paper pulp, which comprises the steps of adding to the pulp at least 0.05%, based on the dry weight of the pulp, of a cellulolytic enzyme, allowing the pulp to contact the cellulolytic enzyme for from about 40 minutes to about 60 minutes at a temperature of at least 40.degree. C., adding at least 0.011%, based on the dry weight of the pulp, of a water soluble cationic polymer, adding at least 0.007%, based on the dry weight of the pulp, of a water soluble anionic or nonionic polymer and forming the thus treated pulp into paper.

Abstract: A method for deinking of repulped xerographic paper comprising adding an organic polymeric particulate and a substantially water insoluble organic ester to a repulped aqueous slurry containing xerographic toner particles in an amount sufficient to at least partially agglomerate the xerographic toner particles within the slurry to larger particle sizes; and removing the xerographic toner particles from the slurry by one or more liquid/solid separation techniques.

Abstract: The present invention comprises block copolymers of alkylene oxides, such as ethylene oxide and propylene oxide, which are further formulated with additional polymers such as poly(N-vinylpyrrolidinone), poly (vinyl alcohol), and certain low foam additives. These polymers are useful for the coating of alumina powders for use in ceramics. In aqueous media, their lower viscosities enable facile spray drying of the coated alumina powders. The coated alumina powders may be compressed under relatively low pressure into high density forms with superior unfired compressive strengths (green strength), they are surprisingly insensitive to relative humidity, are readily ejected from the mold, and finally do not have a deleterious effect upon the ultimate high temperature sintering of the formed bodies.

Abstract: The invention provides an improved method for preparing fired ceramic oxide material. A ceramic oxide powder is dispersed in an aqueous solution containing a dispersant having as an active ingredient a dissolved salt of an anionic polymer formed from maleic acid, maleic acid anhydride, or fumaric acid. The slurry containing the dispersed ceramic oxide powder is spray-dried, compressed while substantially dry, and heated to produce a fired ceramic material. Ceramic materials having relatively higher density and strength can be produced by the method.

Abstract: A process for improving freeness of paper pulp which comprises these steps:a) Adding to the pulp at least 0.05% based on the dry weight of the pulp, of a cellulolytic enzyme;b) Allowing the pulp to contact the cellulolytic enzyme for at least 20 minutes at a temperature of at least 20.degree. C.;c) Adding at least 0.0007% based on the dry weight of the pulp of a water soluble cationic polymer, and thend) Forming the thus treated pulp into paper.

Abstract: An improved method for scavenging dissolved oxygen from industrial waters which comprises treating said waters with at least 1 ppb of morpholinohexose reductone.

Abstract: Aqueous hydrotrope solutions are useful as detackification aids for oversprayed paint solids.

Abstract: A method for using an aqueous hydrotrope solution to remove at least a portion of a solvent from a stream of air containing the solvent, wherein the method comprises introducing the stream of air containing the solvent into a scrubber containing an effective amount of the aqueous hydrotrope solution, and contacting of the stream of air containing the solvent with the aqueous hydrotrope solution thereby producing a first scrubber product stream containing scrubbed air and a second scrubber product stream containing the aqueous hydrotrope solution and the solvent.

Abstract: A method for using an aqueous hydrotrope solution to remove at least a portion of a solvent from a stream of air containing the solvent, wherein the method comprises introducing the stream of air containing the solvent into a scrubber containing an effective amount of the aqueous hydrotrope solution, and contacting of the stream of air containing the solvent with the aqueous hydrotrope solution thereby producing a first scrubber product stream containing scrubbed air and a second scrubber product stream containing the aqueous hydrotrope solution and the solvent.

Abstract: A composition is provided for addition to cellulosic fibers prior to felting them into a sheet comprising as component (a) a monomeric water soluble diallyl dimethyl ammonium halide or homopolymer thereof or mixtures thereof and as component (b) a water dispersible complex fatty amido compound, the proportion of (a) and (b) being sufficient to enhance softness of the dried sheet while increasing or not substantially reducing absorbency of water and tensile strength.

Abstract: The present invention provdes an additive for reducing brightness loss upon pulp refining comprising in combination at least one anionic polymeric compound and at least one inorganic polymer, preferably such combinations wherein any of such anionic polymeric compounds are of low molecular weight. The preferred inorganic polyphosphates of such combination are those having average polymerization numbers of from about 10 to about 45. The weight proportion of inorganic polyphos-hate to anionic polymeric compound in such combination can be within the range of about 1:10::10:1.The present invention also provides pulp refining processes wherein such additive is added at a sufficient amount to the pulp material being refined to reduce brightness loss, such as at dosages of from about 0.0025 to about 0.5 weight percent additive actives to dry pulp, and end product pulps produced by such processes.

Abstract: An improved method for recovering volatile organic paint carrier from paint spray booths of the type comprising a chamber, a duct system for passing air down through such chamber to remove volatile organic paint carrier and over-sprayed paint particles, a sump containing a circulating hydrophilic liquid located at the bottom of the chamber adapted to remove volatile organic paint carrier and paint particles from the air containing them, the improvement which comprises using as the hydrophilic liquid an oil-in-water emulsion which has the following composition:(a) 1-50% by weight of an organic liquid having a boiling point of at least 150.degree.C.;(b) 0.1-30% by weight of the organic liquid of a sulfonate-free oil-in-water emulsifier;(c) balance, water,said emulsion having a pH within the range of 7.5-12.0 and being further characterized as being rapidly broken when the pH is reduced below 6.5.

Abstract: Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of certain amine materials in the hypochlorite bleaching stage.

Abstract: This invention is a method of increasing the amount of retention of deposited starch and pigment on fibers in broke liquid which consists of adding to said liquid a combination dosage of a DMA-epichlorohydrin polymer together with a second polymer consisting of acrylamide/acrylate. Such a polymer may be anionic, such as an acrylamide/sodium acrylate 5% or 30% acrylic acid, or it may be cationic, such as acrylamide/dimethylamino ethyl methacrylate dimethyl sulfate quaternary. The polymers may be applied to the broke directly and preferably in the form of an inverted water-in-oil emulsion. The dosage based on dry weight of starch (T) ranges from 2-35 lbs/T of the DMA-epichlorohydrin polymer product (48% polymer, 0.96-16.8 lbs/T polymer) and 0.5-8 lbs/T based on the second polymer product (28% polymer, 0.14-2.24 lbs/T polymer) selected from the group consisting of copolymers of acrylamide/acrylic acid; copolymers of acrylamide/alkali metal acrylate (e.g.

Abstract: Improved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05--0.5% based on the weight of the dry fiber of polyacrylic acid and/or its water-soluble salts in the chlorination bleaching stages.

Abstract: Inproved pulp strength and brightness of chemically produced pulp can be obtained by treating the pulp with the addition of 0.05-0.5% based on the weight of the dry fiber of thiourea dioxide in the chlorination or hypochlorite bleaching stages.

Abstract: In the alkaline pulping of cellulose and particularly in the step wherein green liquor is converted to white liquor by causticizing or the addition of calcium hydroxide, it has been found that the addition of any of three specially selected organic phosphonate reagents, namely, nitrilotris(methylenephosphonic acid) (Dequest 2000); 2-phosphonobutane-1,2,4-tricarboxylic acid (Bayer PBS-AM); and hexamethylenediaminetetrakis(methylenephosphonic acid) (Nalco 7691/Dequest 2051), accelerates the speed of the reaction to the right. These acid compounds and their soluble alkali metal and ammonium salts have proved effective in increasing the acceleration rate to the right of the causticizing reaction and the production of the titratable sodium hydroxideCaO+H.sub.2 O.fwdarw.Ca(OH).sub.2ca(OH).sub.2 +Na.sub.2 CO.sub.3 .fwdarw.2NaOH+CaCO.sub.3 .dwnarw.these additives give up to a 2-4% increase in causticizing conversion to NaOH when applied at 0.

Abstract: A product and method of preparation useful for treatment of paper which provides paper with increased wet and dry strength comprising a reaction product of a cationic polyacrylamide with glycidaldehyde.