Abstract: An improved fiber reinforced glass composite includes a boron nitride-coated refractory fiber in a matrix of a black glass ceramic having the empirical formula SiCxOy where x ranges from about 0.9 to 1.6 and y ranges from about 0.7 to 1.8. Preferably the black glass ceramic is derived from cyclosiloxane monomers containing a vinyl group attached to silicon and/or a hydride-silicon group. Graceful failure can be obtained after exposure of the composites to temperatures up to 600.degree.-700.degree. C. in air.

Abstract: A process for preparing an oxidation resistant black glass having the empirical formula SiC.sub.x O.sub.y, wherein 0<x.ltoreq.2.0 and 0<y.ltoreq.2.2. The process comprises reacting cyclosiloxane monomers to effect the bonding of one vinyl carbon atom to a silicon, curing the product at not greater than 250.degree. C., and pyrolyzing at about 800.degree.-1400.degree. C. in an atmosphere containing a sufficient amount of oxygen to reduce the carbon content of the black glass to a desired level.

Abstract: A method for the preparation of an ion exchange sorbent containing at least one anion exchange resin, a ferromagnetic substance, and a water permeable organic polymer binder, as well as a process for the use of said sorbent to separate removable anions from feedstreams containing said anion.

Abstract: The instant invention is a membrane useful for separating organic matter such as proteins from aqueous solutions which resists fouling and maintains a high flux during separation. The membrane is prepared by either drying a polysulfone composite membrane, or first treating a polysulfone composite membrane with aqueous methanol and then drying it. The membrane is then exposed to elemental fluorine in an inert gas in the substantial absence of oxygen at a temperature in the range of about -45.degree. to 70.degree. C. After fluorine treatment, the membrane is exposed to air. The fluorine content in the treatment mixture may be from 0.0125 to about 10 volume percent, preferably 0.025 to 2 volume percent. The fluorine treatment does not significantly alter the membrane pore size.

Abstract: The present invention is a method of recovery of base from material comprising base or acid and salt. The method is conducted in an apparatus comprising a cation membrane between two bipolar membranes.

Abstract: A class of di-ortho-substituted bismaleimides undergo uncatalyzed Michael addition with polyhydric phenols to afford chain-extended bismaleimides having a significantly wider processing window than the non-extended parent. The fully cured resins show improved fracture toughness, generally have comparable or superior dielectric constant and dielectric loss, and show no degradation in other properties such as resistance to moisture, to methylene chloride, and coefficient of thermal expansion.

Abstract: 1,1,1,2-Tetrafluoroethane (R134a) is purified to remove 50-10,000 wt. ppm of 2-chloro-1,1-difluoroethylene (R1122) by contacting with a zeolite or carbon molecular sieve having an average pore diameter of 3.8 to 4.8 Angstroms. The zeolite or carbon molecular sieve is regenerated by inert gas stripping residual R134a, followed by a regeneration at elevated temperatures using an inert gas. Regeneration of the zeolite or carbon molecular sieve is accomplished without the substantial reduction in capacity for impurities.

Abstract: Purification of a concentrated aqueous solution of hydroxylamine sulfate (HAS) is carried out by contacting with an organic solution of 1-phenyl-3-methyl-4-trifluoroacetylpyrazol-5-one (HPMTFP) and trioctylphosphine oxide (TOPO). Divalent iron (Fe.sup.II) is removed to below about 3 wt. ppm making it possible to use the purified solution directly in the production of oxime compounds without further purification heretofore required.

Abstract: Improved three-way catalysts for use in converting the exhaust gases from internal combustion engines include ceria supported by an alumina or other metal oxide and the ceria in the freshly prepared catalysts is in the form of crystallites having a size less than 50 .ANG. as measured by X-ray diffraction.

Abstract: APO-BMI is a chain-extended with certain diamines to provide thermosetting resins retaining the improved properties of APO-BMI resins, but having increased toughness in the cured resins.

Abstract: A vinyl ether oligomer especially useful for coatings is prepared by reacting an hydroxyl-terminated polyester, a diisocyanate, and a hydroxy monovinyl ether having formulas as defined herein.

Abstract: Semipermeable membranes comprising polyesters which are resistant to chlorine are prepared by casting on a porous support backing material either a solution comprising a blend of a polymeric hydroxyalkyl acrylate and a polymeric monocarboxylic acid, or a polymeric polycarboxylic acid, or a solution containing a prepolymer which has been formed by the reaction of a polymeric hydroxyalkyl acrylate with an acryloyl halide or an anhydride of a dicarboxylic acid. The porous support backing material is contacted with the solution at contacting conditions, following which the excess solution is removed and the solution-coated porous support backing material is then cured at curing conditions. This membrane will possess excellent characteristics of salt rejection and flux as well as being resistant to the action of chlorine which is present in water which is subjected to a desalination process.

Abstract: A method for producing uniform mixed metal oxides, such as superconducting mixtures including Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x, in which such metals are precipitated as their oxalates from alcoholic solutions of the metals as the salts of a carboxylic acid.

Abstract: A thermosetting resin is comprised of (a) a bisimide, particularly a bismaleimide, (b) a polyphenol, particularly a bisphenol, and (c) dicyandiamide. The polyphenol may be styrene-terminated (i.e. a vinyl benzyl ether of a bisphenol). Flame retardance is improved by the addition of octabromodiphenyl oxide.

Abstract: The present invention is a method and apparatus of controlling a raw salt stream to be treated in an electrodialytical water splitter. An aqueous salt feed stream is fed to an electrodialysis water splitter and a dilute salt stream is withdrawn from the water splitter. The dilute salt stream is fed to an electrodialysis unit comprising a concentration compartment and a diluting compartment, at least part of the dilute salt stream being fed to the concentration compartment. An electrodialysis product stream is withdrawn from the concentration compartment. The product stream and the raw salt stream are controllably combined to form the aqueous feed stream. In accordance with the method of the present invention the salt concentration of the product stream can be maintained below the salt concentration of the raw salt stream. The pH of aqueous salt feed stream can be controlled based on the pH of electrodialysis unit product stream.

Abstract: This invention relates to a photosensitizer which is bound to a cellulose acetate polymer, a method of preparing the bound photosensitizer and a process for using the bound photosensitizer. The photosensitizers which may be used in the invention include rose bengal, rhodamine B, acridine orange, methylene blue and zinc phthalocyanine. The photosensitizer is attached to the cellulose acetate by reacting an acid group on the photosensitizer with a hydroxyl group. Finally, the bound photosensitizer may be used to oxidize undesirable oxidizable compounds present in a hydrocarbon or aqueous fraction. One specific example is the sweetening of kerosene which involves oxidizing the mercaptans contained in the kerosene.

Abstract: This invention relates to a photosensitizer which is bound to a cellulose acetate polymer, a method preparing the bound photosensitizer and a process for using the bound photosensitizer. The photosensitizers which may be used in the invention include rose bengal, rhodamine B, acridine orange, methylene blue and zinc phthalocyanine. The photosensitizer is attached to the cellulose acetate by reacting an acid group on the photosensitizer with a hydroxyl group. Finally, the bound photosensitizer may be used to oxidize undesirable oxidizable compounds present in a hydrocarbon or aqueous fraction. One specific example is the sweetening of the sweetening of kerosene which involves oxidizing the mercaptans contained in the kerosene.

Abstract: High flux semipermeable membranes which comprises the polymerized reaction product within and/or on a porous support backing material may be prepared by contacting the porous support such as a polysulfone with an aqueous solution of a polyamine which may, if so desired, contain a polar aprotic solvent not reactive with the amines, a polyhydric compound and an acid acceptor. The surface of the coated support is freed of excess solution and thereafter contacted with an organic solution of a polyacyl halide for a period of time sufficient to form a polymerized reaction product within and/or on the support material. The resulting composite is then treated with a hydroxy polycarboxylic acid, polyaminoalkylene polycarboxylic acid, suffonic acid, amine salts of acids, amino acid, amino acid salt, polymeric acid and inorganic acid, before drying of the membrane. This will enable the membrane to be stored in a dry manner prior to use thereof in a separation process.

Abstract: A process for producing highly uniform microspheres of silica having an average diameter of 0.1-10 .mu.m from the hydrolysis of a silica precursor, such as tetraalkoxysilanes, which is characterized by employing precursor solutions and feed rates which initially yield a two-phase reaction mixture.

Abstract: The present invention is a method of recovery of base from material comprising base or acid and salts. The method is conducted in an apparatus comprising a cation membrane between two bipolar membranes.