Abstract: A combination of a major amount of acrylonitrile and a minor amount of another monomer copolymerizable with acrylonitrile when grafted onto polyvinyl alcohol provides an improved acrylonitrile polymer for preparing fiber by extruding a fusion melt of such polymer and water.

Abstract: Fusion melts of acrylonitrile polymer and water are effectively melt-spun through spinnerettes of high capillary density without sticking together of the individual filaments.

Abstract: Melt-spinning of a fusion melt of an acrylonitrile polymer and water through a crowded hole spinnerette plate having small orifice diameters is achieved using low molecular weight polymer to provide fiber of desirable physical properties.

Abstract: Acrylonitrile polymers having number average molecular weights in the range of about 6,000 up to about 15,750 provide fiber of desirable properties when melt-spun as a fusion melt with water.

Abstract: The mixture of a hydrophobic alcohol and a nonionic surfactant is an effective dewatering aid for mineral concentrates, significantly lowering the moisture content.

Abstract: Fine coal is recovered with reduced ash content when a bis(alkyl)ester of a sulfosuccinic acid salt is employed as conditioning agent in froth flotation thereof.

Abstract: The use of a collector combination of a fatty acid and a N-sulfodicarboxylic acid aspartate provides boostering action in the recovery of non-sulfide minerals.

Abstract: A conditioning agent comprising a frother and a bis(alkyl)ester of a sulfosuccinic acid salt provides high coal recovery with reduced ash content.

Abstract: Froth flotation of non-sulfide ores is improved in recovery when a collector combination of a fatty acid and a monoester of a sulfosuccinic acid or salt thereof is employed.

Abstract: Use of a cationic copolymer prepared by incremental addition of a cationic monomer during the polymerization reaction of a nonionic monomer in the dewatering of sewage sludges provides improved performance characteristics.

Abstract: An anionic polymer of acrylamide having a skewed molecular weight distribution such that about 60% of said polymer has a molecular weight of about 500 to 2,000 and about 10% of said polymer has a molecular weight of about 4,000 to 12,000 has been discovered. The process of manufacturing this skewed molecular weight distribution anionic polymer is described. Its use as a scale inhibitor for controlling the deposition of adherent scales on the walls of vessels or pipes, and as an anti-precipitant for keeping alkaline earth cations in solution is also described. The use of the anionic polymer of acrylamide consisting of a skewed molecular weight could be used in recirculating water systems, boilers, and in evaporative and reverse osmosis desalination systems.

Abstract: This invention relates to a process and apparatus for producing particulate solids from vaporous reactants in a reactor wherein the reactor zone is remote from the feed inlets to the reactor.

Abstract: Mixtures of certain polycationic and polyanionic polymers derived from an ethylenically unsaturated dibasic acid or an ethylenically unsaturated sulfuric acid are effective compositions for the control of magnesium scale in evaporative desalination units.

Abstract: Magnesium hydroxide scale formation in evaporative desalination units is inhibited by adding to the saline water being processed a mixture of certain polycationic polymers and polyanionic polymers derived from an ethylenically unsaturated dibasic acid or an ethylenically unsaturated sulfonic acid.

Abstract: A single phase fusion melt of an acrylonitrile polymer and water is extruded into a steam-pressurized solidification zone maintained under conditions such that the continuous filament resulting retains sufficient plasticity so that stretching can be effected at a stretch ratio of at least about 25 relative to the linear speed of the single phase fusion melt through the spinnerette.

Abstract: A copolymer of acrylamide and 3-(methacrylamido)propyl-trimethyl ammonium chloride is effective in the dewatering of sewage sludges that have been disinfected with lime.

Abstract: Conditioning of an aqueous slurry of a phosphate ore with a combination of a fatty acid and a dialkylsulfosuccinic acid or salt thereof provides improved beneficiation upon froth flotation of the conditioned ore.

Abstract: 2-vinyl-2-tetrahydropyrimidines are prepared by cleaving 2-acylamidoethyl-2-tetrahydropyrimides at suitable temperature distilling the cleavage products, and recovering the desired product from the distillate.

Abstract: The use of a dialkylsulfosuccinic acid or salt thereof as a dewatering aid in the filtration of mineral concentrates provides reduced moisture content and substantial retention of the dewatering aid on the dewatered mineral concentrate when the alkyl groups of the dewatering aid contain 10 to 24 carbon atoms.

Abstract: Use of a cationic copolymer prepared by incremental addition of a cationic monomer during the polymerization reaction of a nonionic monomer in the drainage of formed paper provides improved performance characteristics.