The invention refers to the use of a particulate catalyst containing 60.0 to 99.5 wt.% ZrO2 stabilised with an oxide of the element Hf and at least one oxide of the element M, wherein M = Ce, Si, Ti, or Y, for the hydrolysis reaction of methionine amide to methionine, wherein the median particle size x50 of the particulate catalyst is in the range of from 0.8 to 9.0 mm, preferably of from 1.0 to 7.0 mm. The invention also refers to a process for preparing methionine comprising a step of contacting a solution or suspension comprising methionine amide and water with said particulate catalyst to provide a reaction mixture comprising methionine and/or its ammonium salt from which methionine can be isolated.
本发明涉及使用含有60.0至99.5重量%的ZrO2的颗粒催化剂,该催化剂稳定于Hf元素的氧化物和至少一种元素M的氧化物,其中M = Ce、Si、Ti或Y,用于甲
硫氨酸酰胺的
水解反应制备甲
硫氨酸,其中颗粒催化剂的中位粒径x50在0.8至9.0毫米范围内,优选在1.0至7.0毫米范围内。本发明还涉及一种制备甲
硫氨酸的方法,包括将含有甲
硫氨酸酰胺和
水的溶液或悬浮液与所述颗粒催化剂接触以提供反应混合物,该反应混合物包括甲
硫氨酸和/或其
铵盐,可以从中分离出甲
硫氨酸。