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Electrochemical hydrogenation of soybean oil by filling H 2 in supercritical CO 2
Author(s) -
Wang Tong,
Geng Haoyuan,
Yu Changhua,
Zhang Xin,
Wu Nan,
Wu Fei,
Yu Dianyu,
Wang Liqi
Publication year - 2019
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/jfpp.13992
Subject(s) - supercritical fluid , soybean oil , electrochemistry , electrolyte , chemistry , hydrogen , iodine value , anode , inorganic chemistry , organic chemistry , electrode , food science
Electrochemical hydrogenation under a mixed gas environment of CO 2 and H 2 was studied. It was found that in supercritical CO 2 (SC‐CO 2 ), the mole fraction of H 2 in both the CO 2 and electrolytes increased as H 2 pressure increased. CO 2 was dissolved in the electrolyte to form unstable carbonic acid, which was easily decomposed into HCO 3 - and H + . Meanwhile, H 2 was electrolyzed to form H + at the anode, so that the conductivity increased, the hydrogen consumption of the reaction increased, and then tended to be stable at a total pressure of 9.0 MPa. Herein, the electrochemical hydrogenation of soybean oil was accomplished at a current of 120 mA, a temperature of 50°C, and an agitation speed of 300 rpm. The iodine value (IV) of the hydrogenated soybean oil was 90.6 g I 2 /100 g oil at 7 hr and the trans fatty acid (TFA) content in the oil was 3.32%. Practical applications In the present study, H 2 was added to the electrochemical hydrogenation reactor and soybean oil was electrochemically hydrogenated by filling H 2 in supercritical CO 2 . By filling H 2 , the TFAs of the hydrogenated soybean oil were reduced, and the TFA content was only 3.32%. The reaction rate of the hydrogenation was faster and the hydrogenation time decreased by 5 hr compared with the hydrogenation of soybean oil at a normal pressure. Moreover, the electrochemical hydrogenation reactor used a moderate pressure and a large reaction volume, which is beneficial to industrialization. The electrochemical hydrogenation by filling H 2 in SC‐CO 2 decreased the hydrogenation time and reduced the industrial production costs. This method can be further applied for industrial purposes.