A process for the preparation of a protein isolate from plant material, wherein said plant material comprises between 10 and 50 wt% on dry weight basis of proteins, said process comprising the steps of: a) crushing or comminuting the plant material to produce a solid cake; b) extracting the solid cake obtained in step a) using a first solvent comprising at least 90 wt% of water, based on the total weight of the first solvent, to obtain a mixture of a first solid fraction and a first liquid fraction; c) separating the first liquid fraction from the first solid fraction; d) preparing a protein concentrate from the first liquid fraction obtained in step c), wherein the protein concentrate comprises 50 to 90 wt% of water, based on the total weight of the protein concentrate, wherein protein is dissolved in the first solvent and/or wherein protein is present in a second solid fraction, wherein the protein content in the concentrate is at least 40 wt%, based on total dry weight of the concentrate; e) adding a second solvent to the protein concentrate obtained in step d), wherein the second solvent comprises at least 90 wt% of a alcohol having 1 to 5 carbon atoms which is miscible with water at room temperature, based on the total weight of the second solvent; f) separating the mixture obtained in step e) into a second liquid fraction and a third solid fraction using a technique chosen from the group consisting of filtration, sedimentation, centrifugation and combinations thereof, wherein the protein content of the third solid fraction is at least 60 wt%, based on total dry weight of the third solid fraction; g) adding a third solvent to the third solid fraction obtained in step f), said third solvent comprising at least 90 wt% of an apolar and lipophilic organic ester having up to 5 carbon atoms, based on the total weight of the third solvent, wherein the apolar and lipophilic organic ester having up to 5 carbon atoms is at least partially miscible with the first solvent and fully miscible with the second solvent at room temperature, wherein the amount of the third solvent is chosen such that the overall liquid phase does not separate into distinct liquid phases; h) separating the mixture obtained in step g) into a third liquid fraction and a fourth solid fraction using a technique chosen from the group consisting of filtration, sedimentation, centrifugation and combinations thereof, wherein the protein content of the fourth solid fraction is at least 90 wt%, based on total dry weight of the fourth solid fraction; i) subjecting the fourth solid fraction obtained in step h) to a technique chosen from the group consisting of vacuum drying, spray drying, superheated steam drying and combinations thereof to obtain a protein isolate wherein the protein content is at least 90 wt%, based on total dry weight of the a protein isolate. a) crushing or comminuting the plant material to produce a solid cake; b) extracting the solid cake obtained in step a) using a first solvent comprising at least 90 wt% of water, based on the total weight of the first solvent, to obtain a mixture of a first solid fraction and a first liquid fraction; c) separating the first liquid fraction from the first solid fraction; d) preparing a protein concentrate from the first liquid fraction obtained in step c), wherein the protein concentrate comprises 50 to 90 wt% of water, based on the total weight of the protein concentrate, wherein protein is dissolved in the first solvent and/or wherein protein is present in a second solid fraction, wherein the protein content in the concentrate is at least 40 wt%, based on total dry weight of the concentrate; e) adding a second solvent to the protein concentrate obtained in step d), wherein the second solvent comprises at least 90 wt% of a alcohol having 1 to 5 carbon atoms which is miscible with water at room temperature, based on the total weight of the second solvent; f) separating the mixture obtained in step e) into a second liquid fraction and a third solid fraction using a technique chosen from the group consisting of filtration, sedimentation, centrifugation and combinations thereof, wherein the protein content of the third solid fraction is at least 60 wt%, based on total dry weight of the third solid fraction; g) adding a third solvent to the third solid fraction obtained in step f), said third solvent comprising at least 90 wt% of an apolar and lipophilic organic ester having up to 5 carbon atoms, based on the total weight of the third solvent, wherein the apolar and lipophilic organic ester having up to 5 carbon atoms is at least partially miscible with the first solvent and fully miscible with the second solvent at room temperature, wherein the amount of the third solvent is chosen such that the overall liquid phase does not separate into distinct liquid phases; h) separating the mixture obtained in step g) into a third liquid fraction and a fourth solid fraction using a technique chosen from the group consisting of filtration, sedimentation, centrifugation and combinations thereof, wherein the protein content of the fourth solid fraction is at least 90 wt%, based on total dry weight of the fourth solid fraction; i) subjecting the fourth solid fraction obtained in step h) to a technique chosen from the group consisting of vacuum drying, spray drying, superheated steam drying and combinations thereof to obtain a protein isolate wherein the protein content is at least 90 wt%, based on total dry weight of the a protein isolate.