Abstract: The invention concerns the purification of impure aqueous hydrazine hydrate solutions by treating the hydrazine hydrate solution by means of a solid absorbent material consisting of microporous particles whose mean granulometry is smaller than 5 mm.

Abstract: A process for the preparation of an organic trihalomethyl derivative comprising electrolytically reducing a compound of the formula:Cl.sub.x F.sub.3-x C--Brin which x is equal to 0, 1 or 2, in a reaction medium also containing an electrophilic substrate which is void of electrochemical activity at the reduction potential of said compound, and a support electrolyte in an aprotic solvent for a time and at a temperature sufficient to form the desired organic trihalomethyl derivative.

Abstract: A liquid composition comprising a mixture of isomers of essentially diisocyanates having the diphenylmethane structure, the distribution by weight of isomers in the composition for each 100 parts by weight of the composition being:32 to 55% of the 4,4' isomer,30 to 45% of the 2,4' isomer,5 to 12% of the 3,4' isomer,4 to 10% of the 2,2' isomer, and2 to 5% of the 2,3' isomer;and the method of making the composition by first reacting a benzyl halide with benzene, followed by nitration, hydrogenation, and phosgenation.

Abstract: Working fluid/solvent compositions for use in absorption heating and cooling equipment, which compositions comprise a chlorofluoroethane with a boiling point between -40.degree. and +50.degree. C. and at least one solvent with a boiling point above 100.degree. C., the solvent being at least one material having the formula:C.sub.m Cl.sub.2m+1 --(CF.sub.2 --CFCl).sub.n --Xwherein m is zero or one, n is an integer from one to four, and is at least two when m is zero, and X is hydrogen or chlorine, X being hydrogen only when m is one.

Abstract: A process for producing 2,2,2-trifluoroethanol or 1,1,1,3,3,3-hexafluoroisopropanol which comprises hydrogenating a fluoro compound having the formula ##STR1## wherein R.sub.1 is hydrogen or CF.sub.3 and R.sub.2 is hydrogen or a straight- or branched-chain alkyl group, which can also be fluoro-substituted, in the liquid phase in the presence of a palladium-on-activated-carbon catalyst, and if desired a tertiary amine co-catalyst.

Abstract: Polycarbonate-based compositions the fire-resistance of which is improved with small but effective amounts of a urazole salt having the formula: ##STR1## wherein R and R' are the same or different and are hydrogen, an alkyl group having from one to six carbon atoms, phenyl, or halosubstituted phenyl, and M is an alkali metal, many of such fire-resistive polycarbonates being transparent, together with method for preparing such fire-resistive polycarbonates.

Abstract: The invention relates to the preparation of trifluoroacetyl chloride by catalytic chlorination of trifluoroacetaldehyde with chlorine. Catalysis is performed in the vapor phase in a fixed bed or a fluidized bed reactor with an activated carbon catalyst. Optionally, hydrochloric acid and/or an inert diluent can be present with the reactant without affecting the results of this process.

Abstract: A process for preparing pure fluoral hydrate or hexafluoroacetone hydrate which comprises reacting a hemiacetal with the formula ##STR1## wherein R is hydrogen or CF.sub.3, with water in a distillation column, removing respectively the methanol or ethanol produced at the head of the column, and recovering at the bottom of the column the pure hydrate so produced.

Abstract: A catalyst support consisting essentially of a mixture of silica and magnesium chloride, said support having a porous structure and containing less than 100 micromoles of hydroxyl groups per gram of support; the process of making such support by heating such mixture at a temperature below about 720.degree. C. in the presence of a dehydrating agent, and catalysts consisting essentially of such support and at least one active component.

Abstract: A stabilized acidic aqueous composition comprising hydrogen peroxide, metallic ions, and 3-amino-1,2,4-triazine, said triazine being present in an amount sufficient to improve the stability of said composition against decomposition of said peroxide and the methods of utilizing such composition to treat metallic surfaces and to precipitate hydrated uranium peroxide from a solution containing uranium dissolved therein.

Abstract: Fluorosilanes containing at least one partially or totally fluorinated chain and at least one silicon chain linked with a thioether bridge, the fluorosilanes being prepared by radical addition of a silicon thiol to a fluorinated olefin, and the fluorosilanes being useful intermediates for the preparation of fluorinated silicones such as fluorinated silicone elastomers.

Abstract: A process for preparing 3-amino-1,2,4-triazole by reacting hydrazine hydrate, cyanamide and formic acid to form aminoguanidine formate and cyclizing the formate, wherein hydrazine hydrate and formic acid are simultaneously added to the cyanamide at 0.degree. to 10.degree. C. and a pH of 6 to 7, maintaining the mixture at 60.degree. to 100.degree. C. and a pH of 7 to 8 to form aminoguanidine formate, evaporating the aminoguanidine formate solution at 30.degree. to 60.degree. C. to a solids content of 100 to 700 g/L, filtering and washing the formate to a dicyandiamide content below 0.25%, and heating the formate at 110.degree. to 200.degree. C. to obtain the aminotriazole.

Abstract: A process for the separation of ethylene glycol from glycolated water obtained from the bottom of an ethylene oxide desorption column in a process for the manufacture of ethylene oxide by catalytic oxidation of ethylene by oxygen in the vapor phase, comprising feeding said glycolated water directly from the bottom of said ethylene oxide desorption column into the top of a separation column having therebelow up to 12 theoretical plates and adding sufficient indirect heat to said glycolated water to form two streams; a first gaseous stream consisting essentially of steam which is removed from the top of said separation column and introduced into said ethylene oxide desorption column to serve therein as the desorption fluid, and a second aqueous stream containing from about 40% to 90% by weight of ethylene glycol which is removed from the bottom of said separation column.

Abstract: Process for the manufacture of high purity ethylene by the decomposition in the gaseous phase of certain aliphatic carboxylic acid esters, at a temperature between about 150.degree. and 300.degree. C. in the presence of a zeolite having a pore diameter above about 0.6 nm as the catalyst.

Abstract: A stabilizing composition for and a process for the bleaching of cellulose-containing fibers or fabrics in a bleaching bath containing an oxidizing agent without any degradation thereof due to the presence of iron or ferrous metals, comprising adding to said bath a stabilizing composition consisting essentially of:______________________________________ A metal chelating agent 1-2 g/l of bath Sodium metasilicate 0-8 g/l of bath pentahydrate Sodium tetraborate 5-10 g/l of bath decahydrate A soluble alkaline phosphate 10-15 g/l of bath (calculated in weight of anhydrous product) A non-ionic wetting agent 1-2 g/l of bath ______________________________________

Abstract: A sizing agent for the paper industry comprising a cationic oligourethane latex; said urethane having the formula: ##STR1## in which R.sub.2 is an alkylene radical containing a C.sub.2 -C.sub.6 radical or a polyoxyalkylenic radical of a degree of polycondensation of 1 to 4,R.sub.3 is an alkyl radical containing at least 7 carbon atoms, andR.sub.4 and X represent the remainder of the quaternizing agent R.sub.4 Xwith(a) R.sub.1 representing ##STR2## R.sub.5 being an aliphatic radical containing C.sub.4 as a maximum and n varying from 1 to 3; or(b) R.sub.1 representing ##STR3## R.sub.5 being ##STR4## in which R.sub.2, R.sub.3, R.sub.4 and X having the preceding definitions and n varying from 2 to 6; and the method of making the oligourethane latex.

Abstract: Adhesive compositions with thermoreversible crosslinking resulting from the reaction of a divinyl ether having the formula CH.sub.2 .dbd.CH--O--R--O--CH.dbd.CH.sub.2, R being aliphatic, aromatic or cycloaliphatic, with a copolymer resulting from the copolymerization of an olefin with an ethylenically unsaturated monocarboxylic acid and, optionally, an ester of an ethylenically unsaturated monocarboxylic acid, the proportion being 0.1 to 5 percent by weight of the divinyl ether to 99.9 to 95 percent by weight of the copolymer.

Abstract: Composite material comprising a flexible sheath covering a roving of fibers impregnated to the core with a finely powdered thermoplastic, the melting point of which thermoplastic is equal to or greater than that of the sheathing material, together with process and apparatus for producing same by using an extrusion coating technique, the coating die being mounted on a leakproof powder fluidization tank via a blowing chamber thermally insulated from the tank.

Abstract: Pipelines internally coated with heat sensitive materials to protect the pipe from corrosion and/or abrasion, the edges of the pipe sections and the interiors of the pipe sections being coated with stainless metal alloy for a distance from one-half to three pipe diameters from the edge of the pipe, the interior of the pipe being coated with the heat sensitive material except for a reserved zone of the interior measuring from one to two diameters from the edge of the section and the heat sensitive material covering about 20 millimeters of the stainless alloy coating, the pipes being joined by a first weld of the stainless alloy and an outer weld of the pipe metal, together with methods for the preparation of such pipelines.

Abstract: Compositions for use as fluids in absorption heat pumps, which compositions comprise a chlorofluoro-hydrocarbon heat exchange fluid, an amide or glycol-ether solvent vehicle, and at least one metal salt of an alkylarylsulfonate which stabilizes the fluid against decomposition, together with use of the compositions in absorption heat pumps.