NOVELTY - Producing purified methanol and/or dimethyl ether from crude methanol, comprises: purifying the crude methanol in at least one preliminary purification stage; feeding a first partial flow of the purified methanol to a final methanol purification; feeding a second partial flow of the purified methanol into a reactor, and at least partially converting into dimethyl ether; purifying the obtained dimethyl ether in at least one purification stage; and removing the unreacted methanol from the dimethyl ether purification stage, and feeding at least partially to the final methanol purification.    USE - The dimethyl ether is useful: as a propellant; and in a diesel engine for replacement of a diesel fuel.    ADVANTAGE - The method: allows production of both the purified methanol and/or dimethyl ether simultaneously, where the amount of both the products is adjusted in a flexible manner; and does not require absorbents, solvents or additives for the preliminary purification and/or the final purification of methanol since the purification steps are carried out by distillation.    DETAILED DESCRIPTION - Producing purified methanol and/or dimethyl ether from crude methanol, comprises: purifying the crude methanol in at least one preliminary purification stage; feeding a first partial flow of the preliminary purified methanol to a final methanol purification; feeding a second partial flow of the preliminary purified methanol into a reactor, and at least partially converting into dimethyl ether; purifying the obtained dimethyl ether in at least one purification stage; and removing the unreacted methanol from the dimethyl ether purification stage, and feeding at least partially to the final methanol purification. An INDEPENDENT CLAIM is also included for a device for carrying out the above method, comprising at least one preliminary purification stage of the crude methanol, at least one final purification stage for final purification of methanol, and at least one dimethyl ether reactor (30) for converting methanol into dimethyl ether, where the supplying lines for both the methanol final purification and the dimethyl ether reactor are connected with the methanol preliminary purification.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the device for producing the purified methanol and/or dimethyl ether.    Distillation column (2)    Condenser (8)    Dimethyl ether reactor (30)    Pressure column (50)    Atmospheric column (70)