Abstract: A process for preparing a high purity lithium salt from lithium carbonate comprises steps A to D as defined hereinbelow: A: treating a mixture comprising lithium carbonate and water by means of CO2 to obtain an aqueous mixture comprising lithium bicarbonate, B: passing said aqueous mixture comprising lithium bicarbonate through an ion exchanger module, C: precipitating lithium carbonate from the ion exchange module treated lithium bicarbonate mixture obtained in step B, and D: working up the precipitated lithium carbonate or converting the precipitated lithium carbonate into some other high purity lithium salt.

Abstract: Thermoplastic molding compositions comprise A) from 30 to 96% by weight of a polyester B) from 1 to 30% by weight of melamine cyanurate C) from 1 to 30% by weight of at least one phosphorus-containing flame retardant D) from 0.01 to 5% by weight of at least one ester or amide derived from a saturated or unsaturated aliphatic carboxylic acid having from 10 to 40 carbon atoms and a saturated aliphatic alcohol or &mine having from 2 to 40 carbon atoms E) from 0 to 60% by weight of other additives and processing aids where the total of the percentages by weight of components A) to E) is 100%.

Abstract: Thermoplastic molding compositions comprise A) from 5 to 96% by weight of a polyester, B) from 1 to 30% by weight of a nitrogen compound, excluding melamine cyanurate, C) from 0.1 to 30% by weight of a phosphinate of formula I or of a diphosphinate of formula II or of polymers of these or mixtures of these  as defined in the specification D) from 0 to 5% by weight of at least one ester or amide of saturated or unsaturated aliphatic carboxylic acids having from 10 to 40 carbon atoms with saturated aliphatic alcohols or amines having from 2 to 40 carbon atoms, and E) from 0 to 60% by weight of other additives, where the total of the percentages by weight of components A) to E) is 100%.

Abstract: A process for breaking down hydroxylamine in aqueous solutions, especially wastewaters, by treatment with an oxidizing agent, which comprises using as said oxidizing agent an alkali metal hypohalite or alkaline earth metal hypohalite or peroxomonosulfuric or peroxodisulfuric acid or a salt thereof and carrying out the treatment with said oxidizing agent at a pH<8.

Abstract: Phosphorus-containing iron powder is prepared by mixing carbonyl iron powder or whiskers with elemental phosphorus, heating the mixture and comminuting the product obtained to give a powder. The powder of the present invention has a particularly low content of extraneous elements.

Abstract: Specific carboxyamide-polysiloxanes of the formula IV ##STR1## or the formula IVa ##STR2## having a carboxyl content of from 0.02 to 1.0 mmol/g and an average molar mass (number average) [M.sub.n ] in the range from 2.times.10.sup.3 to 60.times.10.sup.3 g/mol are used for hydrophobicizing materials of fibrous structure, especially leather or fur skins.

Abstract: Finely divided phosphorus-containing iron is prepared by reacting iron pentacarbonyl with a volatile phosphorus compound, in particular PH.sub.3, in the gas phase. The resulting phosphorus-containing iron powders and iron whiskers have a particularly low content of extraneous elements.

Abstract: The invention relates to a method for preparing silicon-containing iron powders by thermal decomposition of a gas mixture comprising iron pentacarbonyl and, as a volatile silicon compound, a silane or a halogen-free organosilane in which the gas mixture flows through a heated reaction chamber and heating of the gas mixture is effected by thermal conduction. The silicon-containing iron powders obtained are distinguished by a particularly low impurity element content. The silicon-containing iron powders can be used for the fabrication of cores, magnets and radar-absorbing materials.

Abstract: The flow resistance of a diaphragm based on a fiber material is modified by treating the diaphragm during or after preparation thereof with a dispersion comprising a fluorine-containing component and optionally with a solution comprising a precursor of ZrO.sub.2.

Abstract: The invention relates to a process for recycling diaphragms, in particular a process for recycling used asbestos-free diaphragms from alkali metal chloride electrolysis, the diaphragm material being comminuted, the diaphragm material being washed with a wash substrate and a reusable material being obtained.

Abstract: The invention relates to a process for recycling diaphragms, in particular a process for recycling used asbestos-free diaphragms from alkali metal chloride electrolysis, the diaphragm material being comminuted, the diaphragm material being washed with a wash substrate and a reusable material being obtained.

Abstract: Silanes of the general formula I ##STR1## wherein n is an integer of from 1 to 5, at least one of the residues R represents a hydrolyzable residue selected from the group of substituents consisting of halogen, alkoxy, sec. amino and oxycarbonyl hydrogen or oxycarbonyl alkyl, and the other residues represent alkyl, cycloalkyl, aryl or one of the said hydrolyzable residues, a process for their preparation, and their use.

Abstract: An aqueous solution of free hydroxylamine is prepared by a process in which the solution obtained by treating a hydroxylammonium salt with a base is separated into an aqueous hydroxylamine solution and a salt fraction by treatment with water or steam at .ltoreq.80.degree.0 C. The novel process can be carried out in a simple and gentle manner and on a large industrial scale. Owing to the low thermal load, the low concentration of hydroxylamine and the short residence time in the process, the risk of decomposition is minimized.

Abstract: A process for preparing a silane of the formula IR.sup.1.sub.n SiR.sup.2.sub.m (I)whereR.sup.1 is --O--Y, n is an integer from 1 to 3, R.sup.2 is ##STR1## m is an integer from 1 to 3 and n+m=4, and Y and Z are each, independently of one another, unsubstituted or mono- or polyhalo-substituted C.sub.1 --C.sub.20 -alkyl, C.sub.2 --C.sub.20 -alkenyl, C.sub.2 --C.sub.20 -alkynyl and --(CH.sub.2).sub.p --A, where p is an integer from 0 to 6 and A, which is unsubstituted or substituted by one or more C.sub.1 -C.sub.6 -alkyls, is a 3- to 20-membered hydrocarbon ring entails reacting a halosilicon compound of the formula IISiX.sub.4 (II)whereX is fluorine, chlorine, bromine and iodine, with compounds of the formula III and IV, or with an anhydride of the formula V and the compound of the formula IV ##STR2## where R.sup.1 and R.sup.2, and Z have the above meanings, M is a metal of main group one and two.

Abstract: The present invention relates to stabilized hydroxylamine solutions comprising as stabilizer at least one compound of the formula IR.sup.1 R.sup.2 N--A--NR.sup.3 R.sup.4 (I)in which A and R.sup.1 to R.sup.4 are as defined in the description.

Abstract: The invention relates to a process for recycling diaphragms, in particular a process for recycling used asbestos-free diaphragms from alkali metal chloride electrolysis, the diaphragm material being comminuted, the diaphragm material being washed with a wash substrate and a reusable material being obtained.

Abstract: A process for the regeneration of plastic diaphragms is described, in which a mineral acid solution is mixed with a suitable corrosion inhibitor, this mixture is temperature controlled at from approximately 0.degree. to 100.degree. C., preferably 40.degree. to 80.degree. C., in particular 50.degree. to 70.degree. C., and passed through the diaphragm for from approximately 0.1 to 84 hours, preferably 1 to 72 hours, in particular 2 to 24 hours.

Abstract: The rates of oxidation of sulfite/bisulfite-containing solutions in gas-liquid scrubbers for removing SO.sub.2 from gases are reduced by adding oxidation inhibitors to the solutions in an amount of from 0.02 to 20 mmol per hour and per square meter of exchange area.

Abstract: Alkali metal nitrates are prepared by supplying the anode space of an electrolysis cell, separated from the cathode space by a perm-selective cation exchange membrane, with alkali metal chloride solution and at the same time supplying the cathode space with a nitric acid/alkali metal nitrate solution whose alkali metal nitrate concentration is not less than 10% by weight and whose HNO.sub.3 concentration is of from 0.1 to 10% by weight, and withdrawing from the cathode space a solution whose pH does not exceed 5.

Abstract: Wash solutions containing Fe(II) and Fe(III) chelate complexes and used for removing NO.sub.x from waste gases are regenerated by treatment with sodium tetrahydroborate.