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Chemistry and Industry of Forest Products ›› 2020, Vol. 40 ›› Issue (2): 25-32.doi: 10.3969/j.issn.0253-2417.2020.02.003

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Application of Woody Activated Carbon in Refining of Rice Bran Oil

Ao WANG1,Kang SUN1,Jianchun JIANG1,*(),Guanghua LIU2   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab. for Biomass Chemical Utilization; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; Key Lab. of Biomass Energy and Material, Jiangsu Province; Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing 210042, China
    2. Dongguan Baida New Energy Co., Ltd., Dongguan 523000, China
  • Received:2019-09-06 Online:2020-04-28 Published:2020-04-27
  • Contact: Jianchun JIANG E-mail:jiangjc@icifp.cn

Abstract:

Based on the analysis of the physicochemical properties of activated carbon, the refining effects of four activated carbon prepared by chemical method and two activated carbon prepared by physical methods on the grade four rice bran oil were studied. The influence of refining process conditions on the refining effect of the grade four rice bran oil was also investigated. Furthermore, the adsorped activated carbon was regenerated by solvent method, and the refining effect of regenerated activated carbon on the rice bran oil was analyzed, as well as the recovery of rice bran oil and oryzanol. The decolorization performance of caramel were the key factors affecting the decolorization effect of activated carbon on the refinement of grade four bran rice oil. The best technological conditions of CAC4 were as follows:adsorption temperature 50℃, adsorption time 30 min, one-time adding. Under these conditions, when the additive contents of activated carbon 30%, the color degree of refined rice bran oil was yellow 30 and red 3.0 (the width of color trough was 133.4 mm), which reached the first-grade rice bran oil standard. The content of oryzanol was 0.24%, the loss rate of oryzanol was 89.25%, and the loss rate of rice bran oil was 46.7%. When CAC4 was used to adsorbed pigment twice, the decolorization effect of rice oil was still obvious. The regeneration of activated carbon results showed that the adsorption performance of activated carbon was basically restored after regeneration, and it had good refining effect of rice bran oil. The color degree of rice oil refined byCAC4 after tertiary regeneration was yellow 30 and red 2.5. At the same time, the recovery of rice bran oil and oryzanol as well as the selective separation of pigment molecules could be realized during the regeneration process of activated carbon.

Key words: activated carbon, rice bran oil, oryzanol, regeneration of activated carbon

CLC Number: