Abstract: By a method for the methanol synthesis from hydrogen, carbon monoxide and carbon dioxide under pressure, comprising at least one methanol reactor filled with catalyst, whereby in the presence of a plurality of stages, at least one stage is equipped with a compressor, and with a system for carrying out the method, the aim is to overcome the specified drawbacks, and in particular to make it possible to save heat exchanger surface area and/or to increase the yield, while particularly taking into account the changing activity of the catalyst. This is achieved according to the method in that in at least one synthesis stage, the gas mixture intended for us in a methanol reactor filled with catalyst is heated in an additional trimmer heater immediately before it added to said methanol reactor, whereby a corresponding system is characterized in that in at least one synthesis stage, provision is made for a trimmer heater (5) for heating the gas mixture directly impinging upon the methanol reactor (10).

Abstract: A process and a device are for the methanol synthesis from hydrogen, carbon monoxide and carbon dioxide under pressure, in particular for increasing the yield of processes already in use. Desulphurized natural gas is charged in a reformer and the synthesis gas is subsequently admitted to a methanol synthesis. There are the advantages that a favorable possibility for refitting existing plants is provided, and synthesis gas from external sources can be used. This is accomplished in the process in that after passing through the reformer, a side stream from the synthesis gas stream is supplied to a methanol pre-reactor. The methanol produced in the pre-reactor is supplied to the methanol stream exiting from the methanol synthesis of the main stream. A stream of synthesis gas non-reacted in the methanol pre-reactor is recycled into the main stream upstream of the methanol synthesis.