水産動物内臓油利用に関する研究-IV : 分子蒸留法によるビタミン油濃縮の工業化研究(その2)

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概要

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• For establishing the working conditions under which the molecular distillation as a means of concentrating vitamin oil can industrially be carried out with advantage, the necessary data especially in the aspect of yield and concentration magnification of vitamin A were prepared with a few different types of falling film molecular still for industrial use, of which structural details are given in Table 1. Thus in the first place, degassing conditions were examined under which volatile matters were removed from refined vitamin oil before molecular distillation. The results obtained (see Table 2) show that in experiments with whale liver oil, for instance, the vitamin A yield of 93.25% in molecular distillation prearranged by degassing of two times was improved even to be evaluated as 114.62% by additional degassing of two times carried out, in turn, under more drastic conditions. As to the degassing conditions as a factor that governs the yield and concentration magnification of vitamin A, of which the method of evaluation is outlined in the explanation of Fig. 1, it may thus be said that the better result can be obtained by the more frequent practice of degassing operation and especially under rather drastic conditions. In the second place, result of molecular distillation was examined with varying rate of feeding the still with vitamin oil. As seen from the results obtained (see Table 3), the yield and concentration magnification of vitamin oil attainable in molecular distillation decreased, independent of the fish species as vitamin oil source, outside the feeding rate range extending from 31.8kg/m•hr to 63.7kg/m•hr or 82.0kg/m•hr, the latter value changing to some extent according to the employed type of still, as represented by peripheral velocity, namely, the amount of vitamin oil running down across a unit length of periphery of still tube per hour. In the third section of the present work in which the result of molecular distillation was examined as varying with the rate of distillate separation, satisfactory values of yield and concentration magnification of vitamin A were obtained first when the rate of distillate separation from a unit area of distillation surface was far less than 6.19kg/m2•hr and lower even than 4.42kg/m2•hr (see Table 4).

著者

• 曽根 博

  理研ビタミン

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