4results about "Cyanogen compounds" patented technology

The invention relates to catalytically active heating elements, and to the production and use thereof in the production of hydrogen cyanide (HCN). The problem addressed by the invention is that of providing thermally stable and catalytically active heating elements with which a BMA process can be simultaneously electrically heated and chemically catalysed. In particular, the heating elements should be thermally and mechanically stable in continuous industrial operation and retain their catalytic activity. The heating element according to the invention has a layered structure (A, B, C) formed from (A) silicon carbide (SiC), (B) aluminium nitride (AlN) and (C) platinum (Pt). The silicon carbide (SiC) serves as an electric heating resistor. The platinum (Pt) serves as catalyst. Aluminium nitride (AlN) is arranged as a protective layer between platinum (Pt) and silicon carbide (SiC). It prevents platinum (Pt) and silicon carbide (SiC) from alloying during ongoing operation.

The present invention relates to electrically conductive shaped catalyst bodies for use in a chemical reactor comprising a mixture of at least two different solid materials, wherein the mixture comprises i) at least one catalytically active or activatable material, and ii) at least one electrically conductive material, wherein the sum of the volume fractions of all electrically conductive materials of the shaped catalyst bodies is in the range of from 0.2 to 0.35, and wherein the shaped catalyst bodies have a characteristic diameter in the range of from 1 mm to 50 mm, and wherein the sum of the mass fractions of all catalytically active or activatable materials and of the mass fractions of all electrically conductive materials of the shaped catalyst bodies is in the range of from 0.9 to 1. The present invention further relates to a process for preparing the electrically conductive shaped catalyst bodies, to the use of the electrically conductive shaped catalyst bodies as part of a directly electrically heatable catalyst bed or as directly electrically heatable catalyst bed in a chemical reactor and to a chemical reactor for conducting a chemical reaction containing a catalyst bed comprising or consisting of the electrically conductive shaped catalyst bodies. The present invention further relates to a process for conducting a chemical reaction, which is catalyzed by the electrically conductive shaped catalyst bodies.

The invention discloses a method and a system for preparing cyanogen chloride based on continuous flow of a microchannel reaction device, under the condition of temperature control, a NaCN solution and chlorine are introduced into the microchannel reaction device for reaction, then gas-liquid separation, gas washing, drying, condensation and collection are performed to obtain a cyanogen chloride product, and a matched reaction system is provided. The microchannel reaction device is introduced into the reaction preparation process, the heat and mass transfer performance is improved through continuous flow, the heating time is shortened, and continuous production is achieved. No catalyst is used, reaction steps are simplified, and reaction cost is reduced.

A catalytic composition and process useful for the conversion of an olefin selected from the group consisting of propylene, isobutylene or mixtures thereof, to acrylonitrile, methacrylonitrile, hydrogen cyanide and acetonitrile and mixtures thereof, wherein the catalyst exhibiting increased selectivity to hydrogen cyanide compared to prior art catalysts.