NOVELTY - Producing methanol, comprises (i) passing first synthesis gas stream via methanol pre-reactor (24), to obtain second synthesis gas stream, (ii) passing second synthesis gas stream through methanol main reactor, to obtain third synthesis gas stream, (iii) separating third synthesis gas stream into fourth- and fifth synthesis gas stream and recycling fourth synthesis gas stream, (iv) supplying fifth synthesis gas stream into inert gas separation unit, to obtain sixth recycle stream depleted with inert components, and (v) recycling sixth recycle stream into methanol-main reactors.    USE - The method is useful for producing methanol from hydrogen and carbon oxide containing synthesis gas with a high content of inert components.    ADVANTAGE - The method: is economical and simple; consumes less energy; makes use of device with smaller dimensions; and does not require foreign auxiliaries.    DETAILED DESCRIPTION - Producing methanol from hydrogen and carbon oxide containing synthesis gas with a high content of inert components, comprises (i) passing a first synthesis gas stream as a feed stream via at least one methanol pre-reactor (24), in which a portion of the carbon oxide is catalytically reacted with hydrogen to form methanol and separating the obtained methanol, to obtain a second synthesis gas stream, (ii) passing the second synthesis gas stream through at least one methanol main reactor, in which a further part of the carbon oxide is catalytically reacted with hydrogen to form methanol, separating the obtain methanol, to obtain a third synthesis gas stream, (iii) separating the third synthesis gas stream into a fourth synthesis gas stream and a fifth synthesis gas stream and recycling the fourth synthesis gas stream into the methanol-main reactor, to form an inner synthesis circulation, (iv) supplying the fifth synthesis gas stream into at least one inert gas separation stage, to obtain a sixth recycle stream depleted with inert components and a purge stream enriched with inert components, and (v) recycling the sixth recycle stream depleted with inert components into the methanol-main reactors, to form an outer synthesis circulation. INDEPENDENT CLAIMS are also included for:    (1) a plant for producing methanol from the hydrogen and carbon oxide containing synthesis gas with the high content of inert components for carrying out the above mentioned method, comprising (i) at least one methanol pre-reactor, in which a first part of the carbon oxide is catalytically converted to methanol, (ii) at least one methanol-main reactor, in which a further part of the carbon oxide is catalytically converted to methanol, (iii) a first separator (10) with respect to the methanol pre-reactor, for separating the methanol from the synthesis gas, a further separator with respect to the first separator or the methanol-main reactors, for separating further methanol from the synthesis gas, (iv) pipes for recycling the synthesis gas recycle stream to at least one methanol main reactor, (v) an inert gas separation unit and pipes for supplying the synthesis gas from the methanol main reactors to the inert gas separation stage, (vi) pipes for discharging a purge stream from the inert gas separation stage, and (vii) pipes for recycling a recycle stream depleted with inert components to the methanol-main reactors; and    (2) upgrading the plant for preparing methanol comprising the methanol-main reactors, within the inner synthesis circulation by operating with an inert-poor synthesis gas, from operating with an inert-rich synthesis gas, preferably for carrying out the above mentioned method, comprising (i) connecting the first methanol-main reactor upstream of the methanol pre-reactor, and (ii) connecting the second methanol main reactor downstream of the inert gas separation unit, and forming the external synthesis circulation by recycling the recycle stream depleted with the inert components, into the methanol main reactors, where the methanol pre-reactors and the inert gas separation unit are located outside the inner synthesis circulation.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the plant for producing the methanol.    Separator (10)    Compressor (15)    Pressure swing adsorption (18)    Methanol pre-reactor (24)    Heat exchanger (26)