Abstract: The invention relates to a composition for the protection of materials against contaminations, spots and stains.This liquid composition comprises by weight 0.1 to 1% of at least one fluorinated resin based on acrylic or methacrylic esters of fluorinated sulfonamido-alcohol, associated or not with non-fluorinated monomers, 0.4 to 10% of at least one adjuvant selected from aminoplast resins based on melamine, thermoplastic resins and waxes, and 89 to 99.5% of at least one organic solvent.Applied on materials such as walls, facades, monuments or sculptures in cement, bricks, concrete or stones and other construction elements, the composition according to the invention confers on the materials an excellent protection against natural or artificial contaminations.

Abstract: A process for the preparation of 1,2,3,4-tetrahydro-9,10-anthracene-diol, in which catalytic hydrogenation of 1,4,4a,9a-tetrahydro-anthraquinone is carried out in the liquid phase to give 1,2,3,4,4a,9a-hexahydro-9,10-anthracene-dione followed by isomerization of the latter in the presence of an acid to give 1,2,3,4-tetrahydro-9,10-anthracene-diol.

Abstract: The invention relates to a process for the preparation of dyestuffs of the formula: ##STR1## in which R.sub.1 represents hydrogen, alkyl, alkenyl or aralkyl, R.sub.2 represents alkyl, alkenyl, cycloalkyl, aryl or aralkyl, R.sub.3 represents hydrogen, alkyl or alkoxy, R.sub.4 represents hydrogen, alkyl, aryl or aralkyl, R.sub.5 represents hydrogen or alkyl, R.sub.6 represents hydrogen, alkyl or alkoxy, R.sub.7 represents hydrogen or alkyl or forms with R.sub.6 a condensed benzene ring, and X.crclbar. represents an anion, which process comprises reacting a nitroso compound of formula (II) with an aminophenol of formula (III) or a nitroso compound of formula (IV) with a compound of formula (V): ##STR2## in which R.sub.1 to R.sub.7 have the same meanings as above, R'.sub.3, R'.sub.6 and R'.sub.7 each represents H or alkyl, R.sub.8 is a possibly substituted alkyl radical, and R.sub.9 is an alkoxy radical or a possibly substituted amino group.

Abstract: A process for destroying weeds in sorghum crops which comprises applying to the area of the growing crop or to the crop area before the crop emerges, 2,4-diamino-6-chloro-5-methylthio-pyrimidine or a mixture of the two isomeric compounds 2,4-diamino-6-chloro-5-methylthio-pyrimidine and 4,6-diamino-2-chloro-5-methylthio-pyrimidine in which 2,4-diamino-6-chloro-5-methylthio-pyrimidine is preponderant, the rate of application of the above compound or mixture being from 300 g/ha to 4,500 g/ha. Herbicides may be simultaneously applied.

Abstract: Lubricating varnishes for metals obtained by mixing a dispersion of graphite fluoride in glycerine with a separately prepared aqueous dispersion of graphite fluoride, stabilized by a salt of a condensate of naphthalene sulfonic acid with formol.

Abstract: Sodium uranate which is easy to handle, characterized by the spherical form of the grains, the average diameter thereof, between 40 and 150 .mu.m, their uncompacted apparent bulk density of 2.5 to 3.5 g/cm.sup.3 and a flow value higher than or equal to 95, measured on the CARR scale produced by diluting the sodium uranate-containing solution introduced into a fluid bed reactor to between about 0.5 and 5 g/l within a period of less than about 2 seconds before the uranium-containing solution enters the reactor.

Abstract: The invention relates to the preparation of 1-phenyl-3-carbamoyl-5-pyrazolones of the formula: ##STR1## in which the two symbols R and R' may be the same or different and each represents a hydrogen atom, an alkyl radical or a substituted alkyl radical containing 1 to 4 carbon atoms.An aqueous paste of diethyl oxalacetate phenylhydrazone is heated at a temperature not greater than 85.degree. C. until the hydrazone is completely melted, and the aqueous phase is then removed and the remaining hydrazone is treated with 2 to 12 molar equivalents of a compound of the formula HNRR' at a temperature between 20.degree. and 100.degree. C. The formation of 1-phenyl-3-carboxy-5-pyrazolone is thus avoided.

Abstract: Dyestuff of the formula: ##STR1## in which A represents a mono- or disulphonated naphthalene residue which is unsubstituted or substituted by a hydroxy group and/or by an amino group, B represents an aliphatic, aromatic or heterocyclic residue and D represents the residue of a pyrazolone or an ester or amide of .beta.-ketonic acid; process for the coloration of animal or polyamide fibres in which the coloring agent is a dyestuff of the above formula and articles based on animal or polyamide fibres colored by means of such a dyestuff.

Abstract: Resorcinol is prepared by an improved process through superacid (such as perfluorinated alkanesulfonic acids of one to eighteen carbon atoms or polymeric perfluorinated resinsulfonic acids, such as Nafion-H catalyzed cleavage-rearrangement reaction of meta-isopropylphenol hydroperoxide in the form of its protected ether or ester derivatives, including readily cleavable and reusable trimethylsilyl and trifluoromethanesulfonyl derivates. Part of the process is the preparation of needed meta-isopropylphenol in high purity free of other isomers by treating any mixture of isopropylphenol isomers in an excess of anhydrous hydrogen fluoride or a perfluorinated alkanesulfonic acid of one to six carbon atoms and a Lewis acid fluoride or by alkylating (transalkylating) phenol with a propyl alkylating agent in the presence of the aforementioned superacid systems.

Abstract: Resorcinol is prepared in high yield and purity by an improved process through superacid (such as perfluorinated alkanesulfonic acids of one to eighteen carbon atoms or polymeric perfluorinated resinsulfonic acids, such as acidified Nafion-H, catalyzed cleavage-rearrangement reaction of meta-bis(2-hydroperoxy-2-propyl)-benzene (meta-diisopropylbenzene dihydroperoxide). Part of the process is the preparation of needed meta-diisopropylbenzene in high purity (98-100%) substantially free of other isomers by treating any mixture of diisopropylbenzenes with an excess of anhydrous hydrogen fluoride or a perfluorinated alkanesulfonic acid of one to six carbon atoms and a Lewis acid fluoride, or by alkylating (transalkylating) cumene with a propyl alkylating agent in the aforementioned superacid systems.

Abstract: A process for the preparation of percarboxylic acids by the action of hydrogen peroxide on water miscible carboxylic acids in the presence of a boric acid catalyst and a solvent capable of forming a heteroazeotrope with the water and continuously eliminating the water which may have been added with the hydrogen peroxide and the water formed during the reaction by azeotropic distillation.

Abstract: A process for the preparation of dibenzothiazyl disulfide by oxidation of mercaptobenzothiazole in aqueous suspension by means of hydrogen peroxide, in which the oxidation is effected in the presence of ethylenediaminetetraacetic acid or an alkali metal salt derived therefrom.

Abstract: A process for stabilizing mixtures of gasoline and methanol containing at least 30% by volume of methanol is disclosed wherein a primary, linear or branched chain monohydroxylated aliphatic saturated alcohol containing from 8 to 15 carbon atoms or a mixture of such alcohols, is added to the gasoline/methanol mixture. The stabilized mixtures described herein are useful as a fuel for automobiles.

Abstract: The present invention comprises a process for the manufacture of a sodium silicate solution in a continuous manner from a silicon dioxide-containing material, comprising continuously adding to a reaction zone a stream of said silicon dioxide-containing material and a stream of a sodium hydroxide-sodium carbonate solution, reacting said silicon dioxide-containing material and said sodium hydroxide-sodium carbonate at a temperature and pressure and for a time sufficient to form a sodium silicate solution, and recovering said sodium silicate solution from the reaction zone.

Abstract: Process for the preparation of the mononitro derivatives substituted in positions 5 or 6 of 1,2,3,4-tetrahydro-anthraquinone, which comprises nitrating 1,2,3,4,4a,9a-hexahydro-9,10-anthracene-dione by means of nitric acid or a mixture of nitric acid and sulfuric acid.

Abstract: Process for the manufacture in the liquid phase of aromatic isocyanates by the reaction of aromatic nitro compounds with carbon monoxide in the presence of a catalyst comprising a zeolite containing at least one active metal selected from Group VIII or I.sub.B of the Periodic Table of the Elements in the form of a cation or of a metallic crystallite in the zeolite.

Abstract: The compounds of the formula: ##STR1## in which R.sub.1 represents a dichloromethyl or trichloromethyl group, X.sub.1 represents a chlorine or fluorine atom, X.sub.2 represents a chlorine or fluorine atom, X.sub.3 represents a hydrogen, chlorine or fluorine atom, R.sub.2 represents an amino group NH.sub.2 or a ##STR2## group, in which R.sub.3 represents a hydrogen atom or an alkyl, haloalkyl, alkenyl, haloalkenyl, arylalkyl, arylhaloalkyl, cycloalkyl, halocycloalkyl, alkoxyalkyl, haloalkoxyalkyl or aryl group, this latter being unsubstituted or substituted by one or two halogen atoms or by an alkyl, alkoxy, nitro or haloalkyl group are antidotes against herbicides.

Abstract: Process for preparation of percarboxylic acids by the reaction of hydrogen peroxide and a water-miscible carboxylic acid, in the presence of a solvent capable of forming a heteroazeotrope with water, and in the presence of a metalloid oxide catalyst.

Abstract: A process for the synthesis of aromatic isocyanates by the reduction of aromatic derivatives with carbon monoxide in the presence of catalysts consisting of metal complexes of porphyrins. In one embodiment, the metallic porphyrin is synthesized in situ from a porphryin and a metal or a metal derivative.

Abstract: The present invention is directed to a process for biological denitrification of effluents, containing up to 10 g/l of nitric nitrogen, which comprises using an active denitrification support made of selected high performance denitrifying bacteria fixed on a neutral support.