Patent ID: 9034293
Filing Date: 2015-05-19
Classification: B01J,C01C

Abstract:
1. A process for preparing hydrocyanic acid, comprising: dehydrating gaseous formamide at temperatures of from 350 to 650° C. in the presence of a catalyst and 0.1 to 10 mol % oxygen in a reactor, and coupling the dehydration of the gaseous formamide with an exothermic reaction in the reactor, wherein the coupling of the dehydration and the exothermic reaction comprises two separate fluid paths separated by a common reactor wall in the reactor, with one fluid path being provided for the dehydration of formamide and the second fluid path being provided for the exothermic reaction and a specific thermal conductivity λ of the common reactor wall material is greater than 100 W/(mK), wherein the exothermic reaction is a catalytic combustion of combustible gases with introduction of oxygen, and the reactor is a tube reactor or plate reactor comprising at least two parallel, superposed layers A and B, with the layer A having at least two parallel reaction channels in which the catalytic dehydration occurs and the layer B having at least two parallel channels in which the exothermic reaction occurs, and the common reactor wall separating the fluid paths comprises a material selected from the group consisting of copper, silver, aluminum, magnesium and oxidation-resistant silicon-infiltrated silicon carbide.