醗酵乳酸の利用に関する研究 (第7報) : イオン交換樹脂による乳酸メチルエステルの加水分解

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We examined the catalytic action of two cation exchange resins, amberlite IR-120 and diaion-BK, on the hydrolysis of methyl lactate. With the ester concentration of 1M and at the temperature range of 33〜53℃, the process of hydrolysis catalyzed by resin was similar to that catalyzed by HCl, following the first order reaction successfully untill 60% of the ester was hydrolyzed. Velocity constants at 33℃, 40℃, 47℃, and 53℃ were determined, wherby the activation energy was calculated. The velocity constant of the reaction in the boiling water bath was not invariable. Though both these resins were still usable in the boiling water bath, high temperature reduced their catalytic effects. Diaion-BK was 1.5 times as effective as amberkite IR-120 on the basis of the dry weight. In the boiling water bath, it required only 80 and 120 min with 5 g each of diaion-BK and amberlite IR-120,respectively, while it required about 500 min without catalyst to attain an equilibrium at 1 M concentration. With the ester concentrations of 3 M and 5 M, both the resins were still effective as catalyst.
社団法人日本生物工学会の論文
1956-04-15