Abstract: Standard activated carbons have been commonly employed in the purification of contaminated glycol scrubbing solutions used in a liquid-liquid extraction process for the manufacture of petrochemicals. These carbons are shown to cause a depression of pH within the glycol stream when a new carbon type is installed or when the exhausted carbon is replaced. The use of a magnesite containing activated carbon minimizes this pH drop to acceptable levels.

Abstract: The removal of silver from photographic and other solutions using a non-carbon halogen impregnated adsorbent is described.

Abstract: The removal of silver from photographic and other solutions using halogen impregnated activated carbon is described.

Abstract: The instant invention is directed to a method for reducing the viscosity of magnesium hydroxide filter cake paste which comprises adding an anionic polymer or copolymer to the magnesium hydroxide filter cake paste. The instant invention is also directed to a stable magnesium hydroxide dispersion comprising an anionic polymer, water and magnesium hydroxide.

Abstract: The instant invention is directed to a method of inhibiting and dispersing deposit formation on metal surfaces of an evaporator used for the processing of black liquor which comprises the step of treating black liquor, at any point prior to completion of said processing, with a deposit inhibiting concentration of low molecular weight cationic polymer selected from the group consisting of poly(diallyldimethylammonium chloride), polymethacrylamidopropyltrimethylammonium chloride, poly-2-methacryloxyethyltrimethylammonium methosulfate, and poly-2-methacryloxyethyltrimethylammonium chloride.

Abstract: Use of low saponification number vegetable and mineral waxes as boiler water antifoams.

Abstract: Polymerization method utilizing a three-phase system: water-in-oil-in-water or oil-in-water-in-oil comprising the steps (a) adding the monomer material to be polymerized into the innermost water or oil phase; (b) adding, with mechanical agitation, the product of Step a to the middle oil or water phase, said phase containing appropriate surfactant, whereby an emulsion is formed; (c) adding, with mechanical agitation, the emulsion product of Step b to the outermost water or oil phase, said phase containing appropriate surfactant, wherein polymerization proceeds in the innermost water or oil phase until complete.

Abstract: Process for the manufacture of fused polyphosphate glasses in which a hydrocarbon is used as the carrier for the slurry of reactants that are fed to the high temperature furnace.

Abstract: Continuous process for the preparation of water-soluble polymers in which highly concentrated monomer solutions may be polymerized by a combination of a visible light and a thermally initiated process.

Abstract: Electroductive article comprising a coating composition of copolymers containing from 70 percent to 85 percent by weight diallyldimethylammonium chloride and at least 15 percent but less than 30 percent by weight N-methylolacrylamide and optional comonomers is disclosed. These electroconductive polymers are coated onto a substrate and become water-insensitive thereafter.

Abstract: Low temperature process for the preparation of benzotriazole at high solids concentrations by the reaction of orthophenylenediamine, sodium nitrite and acetic acid in an aqueous medium at a temperature in the range of from 5.degree. to 25.degree. C., and neutralizing with caustic to liberate benzotriazole in quantitative yield.

Abstract: In a process for regenerating the activated carbon and in the purification of brown phosphoric acid or alkali phosphates obtained via the so-called wet process employing mineral acid digestion of crushed phosphate rock, the activated carbon used to filter brown H.sub.3 PO.sub.4 is removed from service, washed with water, the initial washings being recovered to reclaim phosphoric acid, and then steeped in a basic aqueous solution, e.g., aqueous alkali hydroxide, alkali carbonate, ammonium hydroxide, loweralkyl amines or loweralkanol amines. After again water washing the activated carbon, to remove residual base, the activated carbon is either returned to service or steeped in an aqueous solution of mineral acid, e.g., sulfuric, hydrochloric, or nitric acid, again washed with water to remove residual acid and returned to service. Usually, the acid steep need not be employed with every base cycle to maintain good decolorization, although if desired the acid steep can be used with each caustic cycle.

Abstract: A method of inhibiting corrosion in an aqueous system comprising treating said system with 1.0 to 300 parts per million by weight of the total aqueous content of said system, of a composition comprising polyphosphate and polymaleic anhydride or amine adducts thereof in a weight ratio of from 10:1 to 1:10.

Abstract: A system and process for decolorizing and purifying brown phosphoric acid using an activated carbon characterized by having a total pore volume of 1.0 cc/g or greater with about half of the total pore volume located in pores 35A or less in radius.

Abstract: The present invention relates to stable equilibrium mixtures of carbodiimides, uretone imines and organic isocyanates and to stable solutions of carbodiimides and uretone imines in polyisocyanates which are free from carbodiimide groups. Either the carbodiimide, or the uretone imine, or both, may contain isocyanate groups. The present invention also relates to a process for the preparation of such products by "heterogeneous catalysis" and the use thereof for the production of polyurethane resins. According to one embodiment of the process according to the instant invention, individual isocyanates in a mixture of various isocyanates may be carbodiimidized selectively.

Abstract: The invention is directed to a method and device for the discontinuous production of block foam. The device has a mixing unit provided with component feed lines and a stirrer. The device is vertically movable on a bridgelike framework. The mixing unit has a bottomless cylindrical shell which serves as a mixing container. The bottomless cylindrical shell can be arranged on a head plate and can be placed on the bottom of a mold placed beneath it. On the bottom of the mold is a flexible elastic layer on top of which is arranged a plastic film.

Abstract: The invention relates to equipment for the continuous production of foam boards, which may be laminated between facings, from a liquid foamable reaction mixture. The apparatus broadly comprises a conveyor, a foam mixture application device located at or near one end of the conveyor and a transverse foam mixture distribution device located downstream of said application device and above said conveyor, the space between said distribution device and said conveyor being adjustable.

Abstract: The instant invention is directed to novel hydroxy-functional vinyl copolymers. The copolymers diclosed herein are produced by polymerizing styrene in the presence of a mono- or diallyl ether of a saturated aliphatic polyol having a hydroxyl functionality of 3 or 4. The resultant copolymer is characterized as having an OH number of between about 45 and about 100 and a number average molecular weight between about 7000 and about 20,000. The resultant copolymerizate is further characterized as forming a substantially clear, colorless solution with conventional liquid polyether polyols used and known in the polyurethane art.

Abstract: The invention relates to equipment for the continuous production of foam boards, which may be laminated between facings, from a liquid foamable reaction mixture. The apparatus broadly comprises(i) a conveyor,(ii) an inclined table at one end of said conveyor, the incline of said table sloping downwardly toward said conveyor,(iii) a foam mixture application device located above said downwardly sloping surface, and(iv) a transverse foam mixture distribution device located downstream of said application device and located above said downwardly sloping surface thereby forming a space therewith. When sheets or relatively thin foam boards or sandwich boards are produced, the device used is generally additionally equipped with an upper conveyor. This invention primarily relates to such double conveyors. The liquid reaction mixture must be applied over the entire width in a particularly uniform layer in order to obtain a perfect final product.

Abstract: The instant invention is directed to a process for the modification of a thermoplastic polymer comprising:I. introducing 70 to 98 parts by weight of thermoplastic polymer into an extruder at a first inlet;II. adding to said thermoplastic polymer through a second inlet 2 to 30 parts by weight of the following polyurethane forming components, such that the total parts by weight of the thermoplastic polymer and polyurethane components is 100:(A) organic polyisocyanate; and(B) chain lengthening agent with a molecular weight below 400 containing at least one hydroxyl group and/or amino group;wherein the ratio of isocyanate groups of component (A) to Zerewitinoff active groups of component (B) is in the range of from 0.90:1 to 1.2:1; andIII. discharging from the extruder the product of the process.