Abstract: A process is proposed for reprocessing the exhaust gas from a plant for producing hydroxylamine or hydroxylammonium salts by catalytic reduction of nitrogen monoxide with hydrogen for the purpose of utilization of at least a part of the nitrogen monoxide and if appropriate hydrogen present in the exhaust gas for producing hydroxylamine or hydroxylammonium salts, which comprises, in a first separation stage, selectively separating off nitrogen monoxide from the exhaust gas of the plant for producing hydroxylamine or hydroxylammonium salts.

Abstract: Process for working up an exhaust gas from a system for producing hydroxylamine or hydroxylammonium salts by catalytic reduction of nitrogen monoxide with hydrogen, the exhaust gas containing nitrogen monoxide, hydrogen, dinitrogen monoxide, nitrogen and ammonia. At least some of the hydrogen present in the exhaust gas is separated off from the exhaust gas by means of a gas-tight membrane-electrode assembly which comprises at least one selectively proton-conducting membrane, a retentate side, a permeate side, and, on each side of the membrane, at least one electrode catalyst, wherein, on the retentate side of the membrane, at least some of the hydrogen is oxidized to protons at the anode catalyst and the protons, after crossing the membrane, are, on the permeate side, at the cathode catalyst according to (I) reduced to hydrogen and/or (II) reacted with oxygen to form water, the oxygen originating from an oxygen-containing stream which is contacted with the permeate side.

Abstract: A process for working up an exhaust gas A from a system for producing hydroxylamine or hydroxylammonium salts by catalytic reduction of nitrogen monoxide with hydrogen, wherein the exhaust gas A comprises nitrogen monoxide, hydrogen, dinitrogen monoxide, nitrogen and ammonia, and at least some of the hydrogen present in the exhaust gas A is separated off from the exhaust gas A by means of a gas-tight membrane-electrode assembly which comprises at least one selectively proton-conducting membrane, a retentate side, a permeate side, and, on each side of the membrane, at least one electrode catalyst, wherein, on the retentate side of the membrane, at least some of the hydrogen is oxidized to protons at the anode catalyst and the protons, after crossing the membrane, are, on the permeate side, at the cathode catalyst according to I reduced to hydrogen and/or II reacted with oxygen to form water, wherein the oxygen originates from an oxygen-comprising stream O which is contacted with the permeate side.

Abstract: A process is proposed for reprocessing the exhaust gas from a plant for producing hydroxylamine or hydroxylammonium salts by catalytic reduction of nitrogen monoxide with hydrogen for the purpose of utilization of at least a part of the nitrogen monoxide and if appropriate hydrogen present in the exhaust gas for producing hydroxylamine or hydroxylammonium salts, which comprises, in a first separation stage, selectively separating off nitrogen monoxide from the exhaust gas of the plant for producing hydroxylamine or hydroxylammonium salts.

Abstract: A hydrogenation catalyst is prepared by reduction of platinum in an oxidation state of not less than two using a reducing agent in an aqueous medium in the presence of a carbon-containing support after partial poisoning, where use is made of a compound of the general formula I ##STR1## where X, Y and Z can be identical or different and are hydrogen, C.sub.1 -C.sub.18 -alkyl, C.sub.5 -C.sub.10 -cycloalkyl, halogen, hydroxyl, C.sub.1 -C.sub.6 -alkoxy and --NR'R", where R, R' and R" can be identical or different and can be hydrogen, C.sub.1 -C.sub.18 -alkyl or C.sub.5 -C.sub.10 -cycloalkyl. Such a hydrogenation catalyst can be used for preparing hydroxylammonium salts and the process for preparing the above catalysts can also be used for regenerating hydrogenation catalysts based on platinum.

Abstract: A process for the preparation of n-butyraldehyde and/or n-butanol, in whicha) 1,3-butadiene is caused to react with an amine of the formula IR.sup.1 R.sup.2 NH, Iin which R.sup.1 and R.sup.

Abstract: A carbon-containing catalyst support is prepared by treating the carbon-containing catalyst support with a compound of the formula IM(OR).sub.m X.sub.n Iwhere M is Ti or Zr, X is Cl or Br, and R is C.sub.1 -C.sub.20 -alkyl, and m and n are integers from zero to four, where the sum of m and n is equal to four.

Abstract: A process for the preparation of a hydrogenation catalyst by reduction of platinum in an oxidation stage of not less than 2 in an aqueous medium in the presence of a carboniferous support, optionally following partial poisoning with a sulfur, arsenic, tellurium, or antimony-containing compound, using a reducing agent, in which the reducing agent used is an ammonium or phosphonium salt of the general formula I?XR.sup.4 !.sub.n Y Iin which X stands for N or P, R stands for hydrogen, C.sub.1 --C.sub.18 alkyl, C.sub.5 --C.sub.10 cycloalkyl, phenyl radical, and also a C.sub.1 --C.sub.4 alkyl radical substituted by phenyl, the phenyl radicals being mono-to tri-substituted by C.sub.1 --C.sub.6 alkyl, halogen, nitro or amino, if desired, provided that the radicals R may be the same or different but cannot simultaneously denote hydrogen, if X is P, n is an integer of 1 to 3, and Y is an organic anion which can reduce platinum in an oxidation stage other than zero to platinum in the oxidation stage of zero.

Abstract: A process for the preparation of n-butyraldehyde and/or n-butanol, whereina) 1,3-butadiene is caused to react with an alcohol of the formula IROH I,to form a mixture of adducts of the formulas II ##STR1## and III ##STR2## b) the adduct III is isomerized to the adduct II, c) the adduct II is isomerized in the presence of a homogeneous or heterogeneous transition metal element catalyst to form the enol ether of the formula IV ##STR3## and d) n-butyraldehyde and/or n-butanol is/are produced from this ether IV by the reaction thereof with hydrogen and water or water only in the presence of a homogeneous or heterogeneous catalyst.

Abstract: A process for the catalytic isomerization of secondary .alpha.-alkenols of formula I ##STR1## in which R.sup.1 is a C.sub.1 -C.sub.20 alkyl group or a C.sub.2 -C.sub.2 alkenyl group and in which R.sup.2 stands for hydrogen, a halogen atom, a C.sub.1 -C.sub.10 alkoxy group, a carbonyl group, or a C.sub.1 -C.sub.20 alkyl group and in which R.sup.1 and R.sup.2 can be joined together to complete a five-membered or six-membered carbocyclic ring, to primary .alpha.-alkenols of formula II ##STR2## or for the isomerization of primary .alpha.-alkenols of formula II to secondary .alpha.-alkenols of formula I, wherein the isomerization is carried out in the presence of organotrioxorhenium(VII) compounds of formula III ##STR3## in which R.sup.3 is a C.sub.1 -C.sub.10 alkyl group, a cyclopentadienyl group substituted by from one to five C.sub.1 -C.sub.4 alkyl groups, an unsubstituted cyclopentadienyl group, a C.sub.6 -C.sub.10 aryl group, or a C.sub.7 -C.sub.

Abstract: Octadienols are prepared by reacting 1,3-butadiene with water in the presence of a catalyst system comprising a palladium compound, a triorganophosphorus compound and carbon dioxide and in the additional presence of a triorganophosphine oxide.