Abstract: A finely-divided cerium metal/metalloid oxide mixture, containing pyrogenically produced metal/metalloid oxide and 0.001 to 95 wt. % cerium oxide, has a specific surface area between 10 and 400 m.sup.2 /g. The mixture is produced by mixing pyrogenically produced metal/metalloid oxide, having a specific surface area between 30 and 400 m.sup.2 /g, with a cerium compound decomposable to an oxide at elevated temperature, the cerium compound being thermally decomposed to the oxide. The cerium oxide-metal/metalloid oxide mixture can be used as a polishing agent or filler.

Abstract: A process for the preparation of 1,1,3-trialkoxypropane by acid-catalyzed reaction of acrolein with a C.sub.1 to C.sub.6 alcohol, which can be carried out well on a large scale and leads to a higher selectivity. The process involves (a) the reaction, in the presence of a solid acid catalyst which is insoluble in the reaction mixture, (b) a partial neutralization of the reaction mixture, using an amine or basic ion exchanger, and (c) specific recovery by distillation of the reaction mixture and recirculation of fractions containing useful materials; aqueous fractions containing recyclable useful materials are largely dehydrated by pervaporation prior to being recirculated.

Abstract: The preparation of high-purity organosilicon disulphanes in which, in a two-stage process, elemental sulphur and an anhydrous alkali sulphide in a deficient amount is first reacted with a halogen alkylalkoxysilane, and the sulphur deficit is then made up by the addition of further alkali sulphide.

Abstract: A method of producing cyanopyridines by means of the catalytic reaction of methylpyridines with ammonia and oxygen at elevated temperature using catalysts consisting of compounds of the elements antimony, vanadium, silicon, titanium and oxygen and compounds of one or more of the alkali metals as well as a method of producing the catalysts and the catalysts themselves.

Abstract: A process for continuous production of methyl mercaptan by catalytic reaction of methanol and hydrogen sulfide. Significant improvements in the pretreatment of the feed gas mixture and in utilization of the heat of reaction and the heat content of the product gas mixture. The energy required to vaporize the methanol is derived partly from utilization of the heat of compression of the hydrogen sulfide gas and from the heat content of the product gas leaving the reactor. The heat of reaction is utilized to heat the feed gas mixture to the reaction temperature, with the help of an external gas heater.

Abstract: A method for producing (S)-cyanohydrins of general formula ##STR1## in which R and R' independently represent (1) hydrogen; (2) a substituted or unsubstituted saturated alkyl group which may include amine, imine, hydroxy, C.sub.1 -C.sub.8 -alkoxy, halogen, carboxyl, C.sub.3 -C.sub.20 -cycloalkyl groups and/or a N,O,S-heteroatom-substituted aromatic ring as substituent; (3) a substituted or unsubstituted, singly or multiply unsaturated alkenyl- or alkinyl group which may include one or several amine, imine, hydroxy, C.sub.1 -C.sub.8 -alkoxy, halogen, carboxyl, C.sub.3 -C.sub.20 -cycloalkyl groups and/or one optionally N,O,S-heteroatom-substituted aromatic ring as substituents; (4) a substituted or unsubstituted aromatic or heteroaromatic group.

Abstract: The invention is relates to a method of producing aryl-substituted, amino-acylated phosphonic-acid derivatives with the aid of metal complexes of chiral amphiphilic ligands in that according to the invention .alpha.-N-acyl-protected, .beta.-substituted alkene phosphone derivatives are asymmetrically hydrogenated in the presence of a chiral rhodium catalyst in a solvent or a suspension. The use of the micelle-forming catalyst makes possible the hydrogenation of unsaturated phosphonic-acid derivatives in water with a high reaction rate with the obtainment of very good enantiomeric excesses.

Abstract: A stable paste for fired-on layers which produces few pyrolysis products contains 0.3 to 3 wt. % of polyethylenimine as binder. The binder inhibits sedimentation of the contents of the paste.

Abstract: Y zeolites with an SiO.sub.2 /Al.sub.2 O.sub.3 ratio in the framework of>100 with a high hydrothermal stability and resistance to aqueous, alkaline solutions are produced by treating a Y zeolite with a SiO.sub.2 /Al.sub.2 O.sub.3 ratio between 8 and 50, partially dealuminized according to known methods from NaY zeolite by treatment with silicon tetrachloride, with water vapor at temperatures between 500.degree. C. and 1000.degree. C.

Abstract: An improved method of producing 3,5,5-trimethylcyclohex-2-ene-1,4-dione (KIP) by the oxidation of 3,5,5-trimethylcyclohex-3-ene-1-one (.beta.-IP) in the presence of managansalene-like catalysts and certain catalytic additives. ##STR1## KIP is an important intermediary product in the synthesis of trimethylhydroquinone, an initial substance in the synthesis of vitamin E. Furthermore, KIP is an initial compound for the synthesis of various carotinoids.

Abstract: Precipitated silica with a sodium sulphate content of 4 to 18 wt. %, particularly with the physical-chemical data:______________________________________ Sodium sulphate content: 4-14 wt. % BET surface area (DIN 66131): 100-190 m.sup.2 /g DBP absorption (anhydrous) 208-250 g/100 g (DIN 53601, ASTM D 2414): 3.0-6.5 wt. % (DIN ISO 787/II) Oversize with >63 .mu.m .ltoreq. 10.0 wt. % ALPINE air-jet sieve >150 .mu.m .ltoreq. 0.1 wt. % >250 .mu.m .ltoreq. 0.01 wt. % ______________________________________It is prepared by introducing hot water into a precipitation vessel, with stirring, adding water glass, then heating the mixture and maintaining the temperature throughout the remainder of the precipitation period. Water glass and sulphuric acid are added simultaneously during this process. The precipitated silica is then separated from the suspension and the filter cake containing sodium sulphate is dried in a spray drier and ground.

Abstract: A process for separating the product gas mixture from the catalytic synthesis of methyl mercaptan. Because of improved separation of the product gas mixture into its components, less hydrogen sulfide and methyl mercaptan are lost in discharging the inert gases than in the known process. The inert gases can be burned without after-treatment of the exhaust gas. Likewise, the process water that is discharged is less contaminated with polysulfides.

Abstract: A porous gas diffusion electrode for membrane fuel cells on an ion-conducting polymer. The electrode contains a finely divided electrocatalyst which is dispersed in a proton-conducting ionomer and has a total porosity of more than 40 to less than 75%. It supplies considerably improved performance data in comparison to known electrodes. The electrode can be produced by using pore-forming materials which are dissolved during the re-protonation of the ion-conducting polymers with sulfuric acid or are decomposed by the action of temperature.

Abstract: A process for the production of bis(silylorganyl)-polysulphanes of the formula(R.sup.1 R.sup.2 R.sup.3 SiR.sup.4).sub.2 S.sub.x (I)in whichR.sup.1, R.sup.2, R.sup.3 : can be identical or different from each other, and are branched and unbranched alkyl and/or is an alkoxy groups with 1 to 8 cations, wherein at least one alkoxy group is present, aryl residues, in particular phenyl, toluyl, benzyl;R.sup.4 : means a divalent alkylidene residue having a chain length of 1-8 C atoms, or--(CH.sub.2).sub.n --C.sub.6 H.sub.4 --(CH.sub.2).sub.n --(n=1 to 4);by reacting haloalkylalkoxysilanes orhaloalkoxysilanes of the formulaR.sup.1 R.sup.2 R.sup.3 SiR.sup.4 X (II)with a polysulphide of the formulaM.sub.2 S.sub.x (III).In a first stage of the reaction, dehydrated polysulphide is obtained by reacting a sulphide hydrate containing water of crystallization with sulphur under a vacuum at a temperature of 60.degree. to 300.degree. C.

Abstract: A process for producing 2-?3(S)-amino-2-(R)-hydroxyl-4-phenyl butyl!-N-tert,butyl decahydro-(4aS,8aS)-isoquinoline-e(S)-carboxamide of the formula (I) via 3(S)-?lower alkoxy carbonyl amino, phenoxy carbonyl amino or benzyl oxycarbonyl amino!-2-hydroxy-4-phenyl butyric acid and process for producing said acid.

Abstract: Carbon blacks containing silicon and a process for manufacturing them. The carbon blacks containing silicon are suitable as reinforcing carbon blacks for rubber mixtures and give the latter viscoelastic properties such as reduced rolling resistance in tires. At the same time, the wet traction is even improved in the process.

Abstract: Compacts produced from a pyrogenically produced oxide, magnesium stearate, methyl cellulose and urea are mixed together in the presence of water, compacted, dried, comminuted to a powder, and the powder is pressed with an isostatic press to compacts and the compacts tempered. The resulting compacts have an outside diameter of 16 to 100 mm.

Abstract: The invention relates to new anellated (oxa) hydantoins, and herbicidal compositions containing same. The invention also relates to methods for controlling noxious plants using the anellated (oxa) hydantoins of the invention.

Abstract: A process for the preparation of substituted 1,2,4-triazoline-3(2H)-ones of general formula (I) ##STR1## by reacting an amide of general formula (IV) ##STR2## with phosgen or thiophosgen or a phosgen substitute or thiophosgen substitute to a compound of general formula V ##STR3## and subsequent reaction of (V) with a compound of general formula (VI) or of an acid addition salt of (VI)Q--NH--NH--CO--R.sup.26 (VI)to compounds of general formula (I).Compounds of general formula (I) can be used as herbicides.

Abstract: This invention relates to a process for the production of primary and/or secondary amines from oxo compounds by catalytic imination of the oxo compound with ammonia or a primary amine and subsequent hydrogenation. Imination proceeds according to the invention in the presence of a novel imination catalyst, namely an organopolysiloxane containing sulphonate groups. This imination catalyst is distinguished by elevated activity. The process is in particular suitable for the production of isophorone diamine from isophorone nitrile, wherein it has proved possible to reduce the content of secondary products and to increase yield.