Abstract:
A process for producing a composite membrane, wherein by hydrothermal synthesis on a porous support, one or more MFI-type zeolites containing microporous separation layers are produced, characterized in that, to the synthesis solution for the hydrothermal synthesis, one or more additions are made from the group of linear (C1-C4)-alcohols, ammonia, primary, secondary and tertiary amines, each having (C1-C4)-alkyl radicals, (C1-C4)-amino alcohols and (C3-C4)-ketones.
Abstract:
The invention relates to a method for producing carbon membranes suitable for separating gases, comprising the steps of a) coating a porous substrate with a solution of at least one organic polymer that can be transformed into a carbon membrane by pyrolysis, b) drying the polymer coating on the porous substrate by removing the solvent, and c) pyrolysing the polymer coating on the porous substrate to form the carbon membrane which is suitable for separating gases, it being possible to carry out each of steps a) to c), or the sequence of steps a) to c), multiple times, and the pyrolysis in step c) taking place at a temperature that is higher than the stoving temperature of the porous substrate.
Abstract:
The invention relates to a method for converting aromatic nitro compounds into the corresponding amines in the presence of hydrogenation catalysts. Said method is characterized in that hydrogenation catalysts are used in which nickel and platinum are provided on a carrier in the form of an alloy, the atomic ratio between nickel and platinum in said alloy ranging between 30:70 and 70:30.
Abstract:
The present invention relates to a process for the preparation of an aqueous polymer dispersion by free-radical emulsion polymerization of a monomer mixture which comprises N,N-diethylaminoethyl methacrylate, to the polymer dispersion obtainable by this process and to its use.
Abstract:
The present invention relates to methods for the production of surface-modified, nanoparticulate particles of at least one metal oxide, metal hydroxide and/or metal oxyhydroxide and of aqueous suspensions of said particles. The invention also relates to the surface-modified, nanoparticulate particles of at least one metal oxide, metal hydroxide and/or metal oxyhydroxide and to the aqueous suspensions of said particles which can be obtained by these methods and their use for cosmetic sunscreen preparations, as stabilisers in plastics and as active antimicrobial active substance.
Abstract:
The invention proposes a method for producing polyether polyols by converting the following reactants: a) one or several alkylene oxides and, optionally, carbon dioxide, as well as b) one or several H-functional starting materials in the presence of a catalyst, having several micro-structured layers, A and B, arranged parallel to one other in a reaction unit such that each layer displays a multiplicity of channels arranged parallel to one another, which form a continuous flow path from one side of the plate to the opposite side of said plate, characterized by the fact that, a distribution device is proposed at the end of layer A for the channels of said layer to supply the reactants as well as the catalyst, and a collection device is proposed at the other end of said layer for the reaction mixture.