THE PRESENT INVENTION RELATES TO A METHOD FOR MANUFACTURING METHYLMERCAPTOPROPIONALDEHYDE (MMP) INCLUDING AT LEAST THE FOLLOWING STEPS: (A) DEHYDRATING GLYCEROL TO ACROLEIN FROM AN AQUEOUS SOLUTION OF GLYCEROL IN THE PRESENCE OF AN ACID CATALYST (B) PURIFYING THE AQUEOUS FLUX FROM STEP (A) TO OBTAIN A FLUX OF ACROLEIN CONTAINING AT LEAST 15 WT % OF WATER RELATIVE TO THE ACROLEIN (C) CAUSING A REACTION OF THE ACROLEIN FLUX OBTAINED IN STEP (B) WITH METHYLMERCAPTAN IN THE PRESENCE OF A CATALYST (D) OPTIONALLY PURIFYING THE PRODUCT OBTAINED IN STEP (C). THE METHOD OF THE INVENTION CAN ALSO INCLUDE A REACTION OF THE PRODUCT OBTAINED IN STEP (C) OR (D) WITH HYDROCYANIC ACID, OR SODIUM CYANIDE DURING A STEP (E) FOLLOWED BY A SUBSEQUENT TRANSFORMATION TO PRODUCE METHIONINE OR METHIONINE HYDROXYANALOGUE, WHICH CAN THEN OPTIONALLY BE PURIFIED. THE ADDITIONAL USE OF METHYLMERCAPTAN AND/OR HYDROCYANIC ACID DERIVED FROM BIOMASS AS RAW MATERIALS IN THE METHOD ACCORDING TO THE INVENTION MAKES IT POSSIBLE TO OBTAIN MMP, METHIONINE OR METHIONINE HYDROXYANALOGUE MADE UP OF 100 % ORGANIC CARBON FROM RENEWABLE SOURCES. NO SUITABLE FIGURE
