摘要:
In a process for the continuous heterogeneously catalyzed gas-phase oxidation of propylene to acrolein, acrylic acid or a mixture thereof in an oxidation reactor whose feed gas mixture comprises, apart from propylene and molecular oxygen as oxidant, only at least one diluent gas which is essentially inert under the conditions of the heterogeneously catalyzed gas-phase oxidation and where, in continuous operation, at least a part of the essentially inert diluent gases present in the product gas mixture is separated off therefrom and is reused as a constituent of the feed gas mixture to the oxidation reactor, the essentially inert diluent gas mixture comprises more than 85% by volume of at least one saturated hydrocarbon having from 1 to 5 carbon atoms.
摘要:
The invention relates to a method for continuously producing 2-butanone from 2,3-butanediol in hot pressurized water having an added electrolyte, characterized in that a compound selected from among the group comprising Ce(SO4)2, Fe2(SO4)3, Al2(SO4) is used as the added electrolyte.
摘要:
The present invention relates to a process for the hydrolysis of nitriles of the formulae and respectively of amides of the formulae in which R is in each case hydrogen or C1-20-alkyl, to give the corresponding amides and/or acids and respectively to give the corresponding acids.
摘要:
The present invention relates to a process for the selective preparation of acetaldehyde, characterized in that acrolein and one or more ammonium salts dissolved in water are reacted continuously under high pressures and at temperatures of 300-400° C.
摘要:
Process for regenerating a silver catalyst deactivated by coking during the gas phase epoxidation of 1,3-butadiene by reacting the coked catalyst with a gas mixture containing at least 5% by volume of water vapor and up to 95% by volume of oxygen at temperatures of from 100 to 500 .degree. C.
摘要:
Compositions of the formula IMo.sub.12 P.sub.a V.sub.b X.sub.c.sup.1 X.sub.d.sup.2 X.sub.e.sup.3 Sb.sub.f Re.sub.g S.sub.h O.sub.n (I),whereX.sup.1 is potassium, rubidium and/or cesium,X.sup.2 is copper and/or silver,X.sup.3 is cerium, boron, zirconium, manganese and/or bismuth,a is from 0.5 to 3.0,b is from 0.01 to 3.0,c is from 0.2 to 3.0,d is from 0.01 to 2.0,e is from 0 to 2.0,f is from 0.01 to 2.0,g is from 0 to 1.0,h is from 0.001 to 0.5 andn is a number determined by the valency and content of the elements different from oxygen in I, are used as catalysts for preparing methacrylic acid by gas-phase oxidation of methacrolein.