Single chamber vaporizer and use thereof in chemical synthesis

A process for preparing an organic compound, the process comprising:

• vaporizing a reactant in a vaporizer;
• transferring the vaporized reactant to a reactor;
• and reacting the vaporized reactant in the reactor with itself or at least one further reactant in the vapor phase with decomposition or reaction, to obtain an organic compound,
• wherein the vaporizer consists of only one chamber, which is a shell and tube chamber, comprising heating tubes comprising a heating medium and optionally running parallel to one another and to the longitudinal axis of the vaporizer, and wherein a) the outer area of the heating tubes based on the chamber is at least 300 mZ/m3, b) the hydraulic diameter of the chamber is 0.03 to 1 m, and c) the chamber has a length of 0.2 to 5 m, wherein liquid formamide is vaporized in the vaporizer and is then catalytically dehydrated in the reactor, wherein the catalytic dehydration is performed at a pressure of 600 mbar to 1.5 bar absolute and at a temperature from 440 to 510° C.