Abstract: The invention relates to a process for the continuous preparation of oleum of a concentration of 10 to 45% by weight of SO3 and/or sulphuric acid of a concentration of 94 to 100% by weight of H2SO4 by combustion of sulphur with atmospheric oxygen according to the principle of superstoichiometric combustion, cooling the resultant sulphur-dioxide-containing gases to 350° C. to 500° C., catalytic conversion of these cooled gases to give sulphur-trioxide-containing gases in the presence of a vanadium-containing catalyst using single or double contact catalysis, absorption of the sulphur-trioxide-containing gases after cooling, if appropriate removal of liquids from the gases after absorption and energy recovery, with liquid sulphur being injected into the hot combustion gas stream perpendicular to the main direction of flow in the form of a fan using one or more bimodal fan-type nozzles.

Abstract: The invention relates to a process for the continuous preparation of oleum of a concentration of 10 to 45% by weight of SO3 and/or sulphuric acid of a concentration of 94 to 100% by weight of H2SO4 by combustion of sulphur with atmospheric oxygen according to the principle of superstoichiometric combustion, cooling the resultant sulphur-dioxide-containing gases to 350° C. to 500° C., catalytic conversion of these cooled gases to give sulphur-trioxide-containing gases in the presence of a vanadium-containing catalyst using single or double contact catalysis, absorption of the sulphur-trioxide-containing gases after cooling, if appropriate removal of liquids from the gases after absorption and energy recovery, with liquid sulphur being injected into the hot combustion gas stream perpendicular to the main direction of flow in the form of a fan using one or more bimodal fan-type nozzles.

Abstract: The present invention relates to high chromium, corrosion resistant, austenitic alloys and to the use thereof.

Abstract: In the continuous production of oleum having a concentration of 10 to 45% by weight SO.sub.3 and/or sulfuric acid having a concentration of 94 to 100% by weight H.sub.2 SO.sub.4 by burning sulfur with atomospheric oxygen on the principle of overstoichiometric or understoichiometric burning, cooling the resulting SO.sub.2 -containing gas to 390.degree.-480.degree. C., catalytically reacting the cooled gas to SO.sub.3 -containing gas on a vanadium-containing catalyst on the principle of single- or double-contact catalysis, absorbing the SO.sub.3 -containing gas after cooling and, optionally, separating liquid from the gas after absorption, followed by recovering energy, the improvement which comprises effecting the burning of the sulfur with atomospheric oxygen in the presence of a dry SO.sub.2 -containing gas which contains up to 5,000 ppm (NO).sub.x expressed as NO.

Abstract: A process for the purification of waste water produced in hydrazine production by the oxidation of ammonia or an amine with an oxidizing agent in the presence of an aldehyde or ketone, comprising intensively mixing the waste water with chlorine or a hypochlorite at a temperature of about 10.degree. C to 110.degree. C and a pH of about 5 to 10 until the treated waste water reaches a redox potential to platinum, relative to Ag/AgCl, of about -400 mV to +800 mV. Advantageously a small amount of waste water is distilled off both before and after the chlorine or hypochlorite treatment.

Abstract: A composition for coating paper, films and fiber materials, comprisingA. 4 parts by weight of a linear polyorganosiloxane with ends stopped by vinyl groups and having a viscosity of up to about 500 cP (20.degree. C) andB. about 0.5 to 1.5 parts by weight of a crosslinking agent containing Si-vinyl units and SiH units and comprising molecules with a maximum of about 10 Si atoms bonded to one another via oxygen, and wherein the two reactive groups are present in adjacent positions in one and the same molecule and the remaining valencies of the Si atom are saturated by methyl groups and the SiH groups are present in a ratio of about 1:1 to 2.5:1 to the total amount of all Si-vinyl units present in the composition,C. a platinum metal complex, the amount of metal being up to about 0.01 part by weight -- based on 100 parts by weight of total composition, andD. a diaziridine, the amount of diaziridine being about 75 to 250 times the weight of metal.

Abstract: In the production of hydrazine wherein aqueous ammonia is oxidized in the presence of a ketone to form an aqueous solution containing at least one of a hydrazone and a ketazine along with ammonia, the hydrazone and ketazine are concentrated and the hydrazone and ketazine are subsequently hydrolyzed to hydrazine and ketone, the improvement which comprises effecting the concentration of the hydrazone and ketazine by extracting the aqueous solution with a substantially water-immiscible organic solvent whereby the hydrazone and ketazine preferentially enter the water-immiscible solvent, and separating the water-immiscible solvent extract from the aqueous solution. The organic solvent is preferably a higher alcohol, a chlorinated hydrocarbon, benzene or a substitution product thereof.

Abstract: A process for the production of a ketazine of the general formula ##EQU1## in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each independently is an alkyl, cycloalkyl or aralkyl radical with up to 12 carbon atoms; or an optionally substituted aryl radical with up to 10 carbon atoms, at most two of the radicals R.sub.1, R.sub.2, R.sub.3 and R.sub.4 being aryl radicals, orR.sub.1 + r.sub.2 and R.sub.3 + R.sub.4 individually is an alkylene radical with from 5 to 10 carbon atoms,Which comprises reacting a 3,3-diorganyl oxaziridine of the formula ##EQU2## with ammonia in the presence of a ketone of the formula ##EQU3## Advantageously the oxaziridine is 3,3-dimethyl oxaziridine, 3,3-methyl ethyl oxaziridine, 3,3-diethyl oxaziridine or 3,3-pentamethylene oxaziridine, the ketone is acetone, methyl ethyl ketone, diethyl ketone or cyclohexanone, the ammonia is used in gaseous form or in solution in water, and the reaction is carried out at a temperature of about -20 to 100.degree.