Roy, Biswajit and Dey, Surajit and Sahoo, Ganesh Chandra and Roy, Somendra Nath and Bandyopadhyay, Sibdas (2014) Degumming, dewaxing and deacidification of rice bran oil-hexane miscella using ceramic membrane: pilot plant study. Journal of the American Oil Chemists Society, 91 (8). pp. 1453-1460. ISSN 0003-021X

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An indigenously developed low-cost clay-alumina-based ceramic microfiltration membrane of 19-channel configuration has been evaluated for degumming, dewaxing and deacidification of rice bran oil (RBO) miscella having different oil contents at pilot scale. Rice bran wax and soap particles in miscella will aggregate with changes in temperature. This suggests a technique for their effective separation. Low-temperature cross-flow membrane filtration was used for single-stage degumming-dewaxing and showed 70 % and 80 % removal of acetone insoluble residue from two RBO miscella samples, respectively. Color reduction was 50 %, and oryzanol retention was 70 %. NaOH was used for deacidification in a 10 % excess of that required based on the free fatty acid content in oil. This reduced free fatty acids to 0.2 %. Operating for 10 h with a 0.7 bar trans-membrane pressure, permeate fluxes of 15 and 8 L/m(2) hr were obtained for the degumming-dewaxing and deacidification operations, respectively. The process has advantages, such as high micronutrient content (1.56 % oryzanol) and negligible oil loss (2.6 %). Moreover, ceramic membrane processing of RBO miscella could be an effective pre-treatment step with respect to micronutrient enrichment, elimination of heating, neutral oil recovery and a viable option for solvent separation.

Item Type: Article
Subjects: Engineering Materials
Divisions: Ceramic Membrane
Depositing User: Bidhan Chaudhuri
Date Deposited: 20 Nov 2014 12:18
Last Modified: 20 Nov 2014 12:18

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