Abstract: Provided is a process for preparing alumina agglomerates which comprises:(i) treating agglomerates of active alumina with an aqueous medium comprising at least one acid making it possible to dissolve at least part of the alumina and at least one compound providing an anion capable of combining with aluminum ions in solution,(ii) subjecting the agglomerates to a hydrothermal treatment at a temperature in the range of from about 80.degree. C. to about 250.degree. C., and then(iii) thermally activating the agglomerates at a temperature in the range of about 500.degree. C. to about 1100.degree. C.The resulting alumina agglomerates possess exceptional mechanical strength, heat resistance and hydrothermal resistance and are useful as catalysts or catalyst supports.

Abstract: This invention relates to a process of inclusion of microorganisms of the group consisting of mycorrhizae and actinorhizae in a polymer gel matrix to prepare a solid, stable, storable preparation suitable for use in particular for agronomic purposes. The polymer gel matrix is based on at least one polymer from the polysaccharide group, with at least partial cross-linking of the polymer.

Abstract: Alkyl carboxylates of the formula:R--CO--O--CH.sub.2 R'are prepared by hydrocarbonylating a compound of the formula:R--CO--O--R'in the simultaneous presence, in the reaction medium, of cobalt, ruthenium, an alkyl iodide and an ionic iodide, the atomic ratio Co/Ru being less than or equal to 1, and the total amount of iodine-containing promoters present in the medium being such that I/Ru is greater than or equal to 5.

Abstract: Process for effecting rapid and homogenous intimate contact of substances which occur in different phases. The process includes a step of producing contact between a helicoidal flow of substances, at least partially in the gaseous state, and a rectilinear flow which is coaxial with the first flow, of liquid or solid substances, at the outlet of a flow passage having a downstream constricted aperture, the amount of movement of the helicoidal flow at the outlet being at least 100 times greater than that of the rectilinear flow. This process can be used in particular for producing mixtures or for drying substances.

Abstract: Rare earth glass-polishing compositions of improved homogeneity and reproducibility are prepared by (a) simultaneously continuously admixing a cerium salt solution, a basic solution and a solution of at least one acid and/or one salt, the anion or anions of which being adopted to form insoluble rare earth compounds, the number of equivalents of base being equal to or greater than the number of equivalents of cerium, and the pH of the reaction medium being greater than about 6; (b) filtering the precipitate which results from the reaction medium; (c) drying said recovered precipitate; and (d) calcining said dried precipitate.

Abstract: Sulfur containing organics, e.g., carbon disulfide carbon oxysulfide, or a mercaptan, are oxidized to sulfur dioxide in gaseopus phase, whether alone or conjointly with hydrogen sulfide and/or elemental sulfur, per se, by passing a gaseous stream thereof, at elevated temperature, over a catalyst composition which comprises (i) a carrier substrate comprising titanium oxide, silica, zirconium oxide, silica-magnesia, silica-zirconia, silica-titanium oxide, zirconia-titanium oxide, or a zeolite, or admixture thereof, and (ii) a catalytically effective amount of at least one catalytically active element of Group Ib, IIb, IIIb, Vb, VIb, VIIb, VIII or Va of the Periodic Table, e.g., copper, silver, zinc, cadmium, yttrium, a lanthanide, chromium, molybdenum, tungsten, manganese, iron, cobalt, rhodium, iridium, nickel, palladium, platinum, tin and/or bismuth, but said catalyst composition being devoid of mixed oxide of spinel type.

Abstract: Gallium and rare earth values are recovered from oxide mixtures thereof by acidulating/dissolving such admixtures in an acid medium, and then liquid/liquid extracting the resulting solution and ultimately recovering said values from the phases which separate. The subject process is advantageously applied, for example, to the recovery of gallium and gadolinium from the waste fines resulting from the production of the garnets Gd.sub.3 Ga.sub.5 O.sub.12.

Abstract: Tripeptides of the general formula: ##STR1## wherein the symbols R, which may be the same or different represent hydrogen or a fatty acid residue (at least one of them representing a fatty acid residue), R.sub.1 represents hydroxy, amino or alkoxy and R.sub.2 and R.sub.3, which may be the same or different, represent hydrogen, carboxy, carbamoyl or alkoxycarbonyl radical (with the proviso that R.sub.2 and R.sub.3 cannot simultaneously represent a hydrogen atom), the alanine moiety being in the L form, the glutamic acid moiety being in the D form, the lysine moiety (when R.sub.2 or R.sub.3 =a hydrogen atom) being in the L form and the 2,6-diaminopimelic acid moiety or its derivatives (when R.sub.2 and/or R.sub.3 =carboxy, carbamoyl or alkoxycarbonyl) being in the D,D, L,L, D,D/L,L (racemic) or D,L (meso) form, and salts thereof, possess immunological adjuvant and immunostimulant activity.

Abstract: Storage stable, water-free, RTV organopolysiloxane adhesives curable in the presence of water or atmospheric moisture, and comprising a dihydroxydiorganopolysiloxane polymer, fillers, an amine fraction and a curing catalyst, are characterized by incorporation therein of a polyalkoxylated organosilane having the formula:R'.sub.x Si[(OCH.sub.2 CH.sub.2).sub.p OCH.sub.3 ].sub.4-xwherein R' is methyl, vinyl, allyl, methallyl or phenyl, and p and x are each one or two.

Abstract: Tetrapeptides and pentapeptides of the formula: ##STR1## wherein R represents hydrogen or a fatty acid residue, R.sub.1 represents hydroxy, amino, alkoxy of 1 to 4 carbon atoms, optionally substituted by phenyl or nitrophenyl, one of R.sub.2 and R.sub.4 represents hydrogen, carboxy, carbamoyl, alkoxycarbonyl of 2 to 5 carbon atoms, optionally substituted by phenyl or nitrophenyl, or a N-carbonylglycine or N-carbonyl-D-alanine radical optionally esterified by alkyl of 1 to 4 carbon atoms (which is optionally substituted by phenyl or nitrophenyl) and the other symbol represents hydrogen, carboxy, carbamoyl, or alkoxycarbonyl fof 2 to 5 carbon atoms, optionally substituted by phenyl or nitrophenyl, and R.sub.3 represents hydrogen, a fatty acid residue or a glycyl or D-alanyl moiety in which the amine group is optionally substituted by a fatty acid residue, it being understood that R.sub.2 and R.sub.4 cannot simutaneously represent hydrogen, that at least one of R.sub.2, R.sub.3 and R.sub.

Abstract: The method of recovering gallium from very basic solutions such as sodium aluminum liquors from the Bayer process by liquid/liquid extraction by means of an organic phase, preferably formed of an organic solvent and water-insoluble alkylhydroxyquinolines of the general formula ##STR1## in which n is a number between 5 and 20.

Abstract: Improved precipitated silica particulates, well adapted as a pigment or reinforcing filler for curable organosilic polymers and other elastomers, have the properties:______________________________________ (i) BET surface area 190 to 340 m.sup.2 /g (ii) CTAB surface area 180 to 280 m.sup.2 /g (iii) ##STR1## 0.9 to 1.2 (iv) Residual sodium content < 500 ppm (v) pH 3.5 to 6.0 (vi) Specific volume V.sub.o .gtoreq. 4.2 (vii) Amount of particles of a < 0.05%. size as will not pass through a 45.mu.

Abstract: A novel sodium orthophosphate has the formula Na.sub.5 H.sub.4 (PO.sub.4).sub.3 wherein the Na/P ratio thereof is essentially 5/3, and which is characterized by but a single crystalline phase and a characteristic X-ray diffraction pattern.

Abstract: A novel anhydrous sodium tripolyphosphate, well adapted as an additive for foodstuffs and detergent compositions, has an Na/P ratio of essentially 1.667.+-.0.01, an apparent density of from 0.5 to 1.1, a mean agglomerate size of less than 100 microns, a phase I content ranging from 15 to 6% by weight, is devoid of insoluble fraction, and displays zero solidification or caking in a quiescent solvent medium.

Abstract: Polychlorobenzenes are isomerized/rearranged, by reacting (i) at least one tetrachlorobenzene, or at least one tetrachlorobenzene in admixture with at least one trichlorobenzene, pentachlorobenzene and/or hexachlorobenzene, or (ii) pentachlorobenzene, or pentachlorobenzene in admixture with at least one trichlorobenzene and/or hexachlorobenzene, or (iii) hexachlorobenzene, or hexachlorobenzene in admixture with at least one trichlorobenzene and/or dichlorobenzene, with at least one alkali metal amide, or at least one alkali metal alcoholate, or admixture thereof, said reaction being conducted in the presence of an agent which complexes the cation of the amide, alcoholate, or admixture thereof.

Abstract: New 3-vinylcephalosporins of the general formula (I), ##STR1## in which n=0 or 1, R.sub.1 is a radical of the general formula (II), ##STR2## in which R.sub.4 is hydrogen or a protective radical and R.sub.5 represents a radical of the general formula (IIa) ##STR3## in which R.sup.a.sub.5 and R.sup.b.sub.5 are hydrogen or alkyl or together form an alkylene radical and R.sup.c.sub.5 is hydrogen or a protective radical, R.sub.2 is hydrogen, a protective radical or a radical which can easily be removed by an enzymatic method, and R.sub.3 is a halogen atom or a radical R'.sub.3 SO.sub.2 O-- or R".sub.3 CO--O--, in which radicals R'.sub.3 and R".sub.3 are substituted or unsubstituted alkyl or phenyl radicals, or alternatively R.sub.1 is a hydrogen atom or a radical of the general formula (II) in which R.sub.4 is defined as above and R.sub.5 is hydrogen, alkyl, vinyl, cyanomethyl or a protective radical, and R.sub.2 is defined as above, or R.sub.1 is hydrogen or a variously substituted acyl radical and R.sub.

Abstract: A process for the manufacture of low molecular weight polyacrylic acids or their salts is provided, particularly, their aqueous solutions. Acrylic acid in an aqueous solution containing a polymerization initiator is polymerized in the presence of acetic acid and/or propionic acid.The solutions obtained have a low viscosity and are very stable on storage.

Abstract: The invention relates to a process for the preparation of acetic anhydride by carbonylation. In the process, carbon monoxide is reacted with methyl acetate in the liquid phase, in a carboxylic acid, in the presence of an effective amount of nickel, methyl iodide, an ionic iodide selected from the group consisting of quaternary ammonium iodides, quaternary phosphonium iodides, sodium iodide, potassium iodide and cesium iodide, and a co-catalyst selected from the group consisting of lithium salts and alkaline earth metal salts.

Abstract: SiO.sub.2 /MeO metallic silicates, wherein Me is lead or an alkaline earth metal, have a molar ratio of SiO.sub.2 to MeO of greater than 2, and same are well suited as pigments, fillers, and especially as glass-formers.

Abstract: The invention relates to a process for the preparation of acetic anhydride by carbonylation. In the process, carbon monoxide is reacted with methyl acetate in an anhydrous medium, in the liquid phase, in the presence of an effective amount of nickel, methyl iodide, a quaternary ammonium or quaternary phosphonium iodide and a lithium salt, the reaction medium initially containing acetic anhydride, if desired.