Process for purifying raw synthesis gas by physical absorption in methanol, wherein the process comprises the following process steps: (a) providing a raw synthesis gas stream, wherein the raw synthesis gas of the raw synthesis gas stream comprises hydrogen (H 2) and carbon monoxide as desired constituents and comprises water (H 2 O) and acid gases as undesired constituents; (b) admixing the raw synthesis gas stream with methanol; (c) cooling the methanol-admixed raw synthesis gas stream below the freezing point of water; (d) separating a liquid phase from the cooled raw synthesis gas stream, wherein the liquid phase comprises methanol and water and the remaining gaseous phase comprises hydrogen, carbon monoxide and acid gases; (e) removing the acid gases from the gaseous phase obtained according to step (d) by physical absorption in methanol at elevated pressure, whereby a purified synthesis gas stream is obtained and a methanol stream laden with acid gases is obtained; (f) regenerating the methanol stream laden with acid gases, wherein a regenerated methanol stream and an acid gas stream are obtained; (g) reusing the regenerated methanol stream obtained according to step (f) for removing acid gases by physical absorption in methanol according to step (e), characterized in that the liquid phase obtained according to step (d) is subjected to a stripping, thus at least partially desorbing gases dissolved in the liquid phase from the liquid phase to obtain a stream of desorbed gases produced by stripping of the liquid phase, wherein methanol vapour is used as the stripping medium and wherein the regenerating of the methanol stream laden with acid gases according to step (f) is at least partially carried out by removal of water from methanol by a thermal separation process, wherein the methanol vapour produced in the thermal separation process is used as the stripping medium. (a) providing a raw synthesis gas stream, wherein the raw synthesis gas of the raw synthesis gas stream comprises hydrogen (H 2) and carbon monoxide as desired constituents and comprises water (H 2 O) and acid gases as undesired constituents; (b) admixing the raw synthesis gas stream with methanol; (c) cooling the methanol-admixed raw synthesis gas stream below the freezing point of water; (d) separating a liquid phase from the cooled raw synthesis gas stream, wherein the liquid phase comprises methanol and water and the remaining gaseous phase comprises hydrogen, carbon monoxide and acid gases; (e) removing the acid gases from the gaseous phase obtained according to step (d) by physical absorption in methanol at elevated pressure, whereby a purified synthesis gas stream is obtained and a methanol stream laden with acid gases is obtained; (f) regenerating the methanol stream laden with acid gases, wherein a regenerated methanol stream and an acid gas stream are obtained; (g) reusing the regenerated methanol stream obtained according to step (f) for removing acid gases by physical absorption in methanol according to step (e), the liquid phase obtained according to step (d) is subjected to a stripping, thus at least partially desorbing gases dissolved in the liquid phase from the liquid phase to obtain a stream of desorbed gases produced by stripping of the liquid phase, wherein methanol vapour is used as the stripping medium and wherein the regenerating of the methanol stream laden with acid gases according to step (f) is at least partially carried out by removal of water from methanol by a thermal separation process, wherein the methanol vapour produced in the thermal separation process is used as the stripping medium.