醗酵乳酸の利用に関する研究 (第16報) : 気-液相反応における乳酸メチルの製造 (4) : 半連続型式における中間工業試験

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The formation of methyl lactate using a semicontinuous system on a pilot plant scale was studied. 200 moles of fermentation lactic acid (mother lactic acid) were placed in a reaction vessel equiped with agitater (100 r.p.m.) and sparger, and was reacted with the vapor of methyl alcohol introduced from the sparger. At the desired time after the reaction started, fermentation lactic acid (the added lactic acid) was added continuously at constant rate through a flow meter up to 200 moles. The mixture containing ester, water, and methyl alcohol was distilled and collected in a receiver through a cooler.The yield of methyl lactate was about 93% under the following experimental conditions : feed rate of methyl alcohol 112g per min., reaction temperature 105-107℃, concentration of mother lactic acid and the added lactic acid 60%, sulfuric acid to 1 mole of lactic acid 5.1 g, feeding of the lactic acid 150 min. after the reaction started, feed rate of the lactic acid 100g per min., reaction time 10.5 hours, mole ratio of methyl alcohol to lactic acid 5.4.The optimum mole ratio of methyl alcohol to lactic acid in the reaction using 200 moles of lactic acid was one third of the run where 1 mole of lactic acid was used.Using the batch system, the composition of distillate containing ester, water and methyl alcohol was progressively changed with the proceeding of the reaction. On the other hand, the composition of distillate in the semicontinuous system was not changed during the feeding of the lactic acid : i.e., the istillate contained ester 32-34%, methyl alcohol 44〜46%, and water 20〜25%, respectively.Volatile acids, such as butyric acid, propionic, acetic, and formic acids, contained in fermentation lactic acid, were rapidly esterified during reaction, and the ester corresponding to 90% of volatile acids was distilled after 1 hour from start of reaction. During the esterification process, butyric acid presumably derived from other materials was not formed while other volatile acids, especially formic acid, was found to in appreciable amounts. The amount of volatile acid ester was about 2.5% of that of the total ester.
社団法人日本生物工学会の論文
1962-11-15

醗酵乳酸の利用に関する研究 (第16報) : 気-液相反応における乳酸メチルの製造 (4) : 半連続型式における中間工業試験

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