Abstract: Organic phosphate solvents used in the extraction of phosphoric acid from impure phosphoric acid solutions, and from which the phosphoric acid has been stripped, are washed with an aqueous alkali orthophosphate solution to remove impurities, particularly silica, fluorine and organic impurities, from the solvent prior to re-use.

Abstract: Alkali values are recovered in a cyclic method from mechanically mined trona ore or from trona deposits by a solution mining technique utilizing a solvent comprising an aqueous solution of sodium sulfide. The ore is solubilized as sodium carbonate which is precipitated as sodium sesquicarbonate and/or sodium bicarbonate by treating the solution with hydrogen sulfide and the precipitated salt separated from the mother liquor. In the process, sodium sulfide and hydrogen sulfide become converted into sodium hydrosulfide which is contained in the mother liquor. Heat treatment of the mother liquor converts the sodium hydrosulfide into sodium sulfide thereby regenerating a solution of sodium sulfide which is recycled to the trona ore and into hydrogen sulfide which is evolved and recycled to the sodium carbonate solution.

Abstract: Natural protein hydrogel structures formed from natural proteins having molecular weights not exceeding 100,000 by dissolving the protein in an aqueous acidic solution, crosslinking the protein, and air drying to a moisture content not exceeding 10 percent. The air dried structure may or may not be bleached with an aqueous solution of an oxidizing agent and thoroughly washed with water. The washed structure is dehydrated by treatment with a water-miscible organic solvent, washed with water, and redried to a moisture content of not more than 10 percent. The structures may be in the form of soft contact lenses, films, fibers, and prosthetics.

Abstract: A molded plant container having at least one slit along the vertical wall of the container, a separable liquid-tight fastener along the slit edges and a living hinge in a wall of the container permitting the side wall to be separated from a contained root ball. The bottom wall of the container may be provided with readily removable circular areas so as to adapt the container for use in air layering propagation of plants.

Abstract: An invalid supporting structure for relieving pressure on bony areas or any other desired area of a received person to alleviate decubitus ulcers and accelerate the healing thereof. The structure comprises a resilient, sponge-like pad having at least one aperture located at a predetermined position adapted to register with a desired area of a person with means for passing a gas into and venting the gas from the aperture.

Abstract: A fluffy, finely-divided fibrous collagen derived product having hemostatic and adhesive properties sufficient to join together severed biological surfaces in a live warm blooded animal when the product is wet with blood between the surfaces. In the preparation of the product, water-wet collagen is treated with ethanol to remove water, is converted to a ionizable partial salt in the presence of ethanol and dehydrated with ethanol so as to control and limit the swelling of the collagen fibers and prevent hornification upon drying. The recovered dry material is subjected to deaggregation to form a mass having a bulk density of not more than 8 pounds per cubic foot and a surface area of at least 1 square meter per gram.

Abstract: Finely-divided, water dispersible, low molecular weight, linear polyamide resin particles having a unique morphology and of uniform particle sizes are formed by preparing a linear polyamide of a predetermined low molecular weight in the presence of water followed by rapidly quenching the reaction mass with an aqueous medium below the freezing point of the polyamide and continuing the cooling of the mass to a temperature sufficiently low so as to prevent particle growth and structural alteration while regulating the pH of the quenched mass to provide particles of predetermined, uniform size dispersed in the aqueous medium. The particles vary from ultimate flaky sheets or lamellae to loosely packed, randomly oriented, clusters of flaky sheets. Spray dried products may be agglomerates which disintegrate readily in water to the original particles or aggregates depending upon intended uses.

Abstract: Finely-divided, water dispersible, low molecular weight, linear polyamide resin particles having a unique morphology and of uniform particle sizes are formed by preparing a linear polyamide of a predetermined low molecular weight in the presence of water followed by rapidly quenching the reaction mass with an aqueous medium below the freezing point of the polyamide and continuing the cooling of the mass to a temperature sufficiently low so as to prevent particle growth and structural alteration while regulating the pH of the quenched mass to provide particles of predetermined, uniform size dispersed in the aqueous medium. The particles vary from ultimate flaky sheets or lamellae to loosely packed, randomly oriented, clusters of flaky sheets. Spray dried products may be agglomerates which disintegrate readily in water to the original particles or aggregates depending upon intended uses.

Abstract: Sulfur produced by the reaction of hydrogen sulfide and sulfur dioxide in the presence of organic solvent solutions of alkali or alkaline earth metal salts of carboxylic acids is contaminated with these carbonaceous materials. The sulfur is purified by washing with water at elevated temperatures to reduce the carbonaceous material content to 0.007% carbon, by weight.

Abstract: Regenerated cellulose sponges of incresed absorbency and rate of absorption formed by impregnating the sponge material with a solution or dispersion containing from 0.005 to 0.25% of a water-soluble or water-dispersible, high molecular weight, hydrophylic, film-forming polymer, drying the impregnated sponge and compressing it. The presence of the film-forming polymer allows the cutting of desired shaped individual sponges from the treated sponge material with a minimal formation of lint particles on the cut surfaces.

Abstract: There are disclosed, as novel compounds, high molecular weight hindered phenols based on the condensation of a nitroalkane with either formaldehyde and di-t-butylphenol or with a substituted derivative of a di-t-butylphenol. The compounds are generally useful as antioxidants for a wide variety of organic substrates.

Abstract: Organic substrates stabilized against oxidative deterioration by the use of high molecular weight hindered phenols based on the condensation of a nitroalkane with either a dialkyldithiocarbonate or with formaldehyde and a di-t-butylphenol or a substituted derivative of a di-t-butylphenol.