Direct Liquefaction of Rice Straw.

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  • 稲わらの直接液化
  • イナワラ ノ チョクセツ エキカ

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Abstract

The liquefaction of powdered rice straw, suspended in an aqueous solution of sodium carbonate or potassium carbonate as a catalyst, was examined at temperatures ranging from 250 to 376°C, and with reaction times 0, 30 and 60 min. by using a convenient small-sized tubing-bomb as a reactor. Separation procedure of the reaction mixtures is demonstrated in Fig. 1.<BR>The effect of reaction temperature on the yield of products, using sodium carbonate, is shown with different reaction times in Fig. 2. The oleaginous substance O-1 and O-2 are the major parts of the liquefaction products. The whole oily products, the sum of O-1, O-2, O-3 and O-4, increase with the rise in temperature until 350°C, ranging from 6% (250°C, 0min.) to 27% (350°C, 60min.) of the original weight of rice straw, while the case at 376°C, a super-critical temperature of water, is exceptional.<BR>Similarly, the temperature-dependence of the yield of products, using potassium carbonate, is shown in Fig. 3, with different reaction times. The yield of main oily product O -1 increases with the rise in reaction temperature. Potassium carbonate is slightly better than sodium carbonate as a catalyst.(Fig. 4)<BR>The effect of addition of organic solvent, e. g. acetone, on the yield of main oily product O-1 is shown in Fig. 5.<BR>The yields, elementary compositions and heating values of oily products O-1 and O -2, which obtained under various reaction conditions, are listed in Table 1.

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