Abstract: The present invention discloses a tunable, radiation filter comprising a highly ordered crystalline array of microparticles fixed in a polymerized hydrogel.

Abstract: The present invention discloses radiation filters comprising a highly ordered crystalline array of microparticles fixed in a polymerized hydrogel in which is contained simple sugars or polyhydric alcohols to provide additional low temperature stability.

Abstract: The present invention discloses radiation filters comprising a highly ordered crystalline array of microparticles fixed in a polymerized hydrogel.

Abstract: The present invention discloses satellite peak free radiation filters comprising a highly ordered crystalline array of microparticles fixed in a polymerized hydrogel.

Abstract: The present invention discloses a tunable, radiation filter comprising a highly ordered crystalline array of microparticles fixed in a polymerized hydrogel.

Abstract: A process for the recovery of mineral values from base metal and precious metal ores is disclosed. Specifically, a froth flotation process is disclosed which comprises contacting an aqueous ore slurry with an effective amount of a dihydroxyalkyl group containing polysaccharide, a mineral collector and a frothing agent.

Abstract: A process for the recovery of mineral values from base metal ores is disclosed. Specifically, a froth flotation process is disclosed which comprises contacting an aqueous ore slurry with an effective amount of hemicellulose, a mineral collector and a frothing agent.

Abstract: The iron content of Bayer process streams is reduced by contacting said stream with a tertiary hydroxyl-containing polyamine.

Abstract: A method for preparing 2-alkenylimidazoles from readily available 2-alkylimidazoles or 2-alkylimidazolines by dehydrogenating the 2-alkylimidazole or 2-alkylimidazoline in the presence of a suitable dehydrogenation catalyst. The preferred method provides 2-vinylimidazole by dehydrogenating 2-ethylimidazole or 2-ethylimidazoline. The reaction is advantageously carried out in a vapor phase in the presence of an inert carrier gas using as preferred dehydrogenation catalysts, copper chromites and catalysts comprising one or more of the metals molybdenum, iron, cobalt, zinc or chromium on non-reducible oxide supports such as alumina or silica.

Abstract: 2-Alkenylimidazoles or the corresponding 1,3-dialkyl-2-alkenylimidazolium salts are homo- or copolymerized employing free radical catalysts.

Abstract: An iron ore is finely ground and slurried prior to being subjected to treatment with a selective flocculant for iron values. Subsequent to treatment, the iron values are allowed to settle into the underflow concentrate and be recovered. The selective flocculant employed is a hydroxymethylated polyacrylamide having a high molecular weight and a degree of hydroxymethylation in excess of about 50%.

Abstract: Selective flocculation of iron ores is accomplished through the employment of partially carboxylated polyacrylamides as the selective flocculant. The partially carboxylated polyacrylamides employed in the selective flocculation contain from about 20-65% carboxyl groups and are of a molecular weight in excess of one million. The selective flocculation process performs a separation of iron ores predominantly containing semitaconite, oxidized taconite and hematitic-goethitic jaspers from their associated siliceous gangue.

Abstract: Water-soluble cross-linked polysulfonium derivatives of poly(thiodiethanol) ethers are provided by reacting the ethers with difunctional sulfide-reactive alkylating agents.

Abstract: A cationic copolymer is prepared by first dissolving the total quantity of a suitable nonionic monomer in water. To this solution there is added up to about 95 mole percent of the total quantity of a suitable cationic monomer of greater reactivity than the nonionic monomer. The solution is then emulsified in a sufficient quantity of a hydrocarbon oil so as to provide a water-in-oil emulsion, with the water phase dispersed. Polymerization is then initiated with incremental additions of the withheld cationic monomer continuing throughout the copolymerization reaction. The resulting cationic copolymer exhibits a uniform distribution of cationic moieties along the polymer chain length which, in turn, has been shown to be a surprisingly more effective cationic copolymer when employed as a dewatering aid.

Abstract: Water-soluble cross-linked cationic polysulfonium derivatives of poly(thiodiethanol)ethers are useful flocculants for suspended solids in aqueous medium.

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: 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.

Abstract: 2-acylamidoethyl-2-tetrahydropyrimidines are disclosed which are desirable precursors for 2-vinyl-2-tetrahydropyrimidines.

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

Abstract: 2-acylamidoethyl-2-imidazolines are disclosed which are desirable precursors for 2-vinyl-2-imidazolines.