Premium
Monitoring of hydrogenation with various catalyst ratios
Author(s) -
Cizmeci Melih,
Musavi Anar,
Kayahan Muammer,
Tekin Aziz
Publication year - 2005
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-005-1166-3
Subject(s) - selectivity , catalysis , chemistry , nuclear chemistry , iodine value , iodine , soybean oil , reaction rate constant , medicinal chemistry , organic chemistry , kinetics , food science , quantum mechanics , physics
Soybean oil was hydrogenated using two different nickel‐based commercial catalysts (Nysosel 222 and SP‐10) at various ratios in 4‐L reactors under constant conditions (165°C, 2 bar hydrogen pressure, and 500 rpm stirring rate). Trans isomer formation, reaction rates, selectivity ( S ) ratios, and melting behaviors of the samples were monitored during the reactions. When Nysosel 222 was used at 0.02, 0.03, and 0.04%, iodine values (IV) were reduced from 130.1 to 70.6, 50.9, and 44.7 and total trans isomers increased from 0 to 34.2, 43.3, and 40.5%, respectively, after 100 min of hydrogenation. However, SP‐10 reduced IV from 130.1 to 77.2, 75.7, and 71.3 after 100 min when used at 0.1, 0.15, and 0.2%, respectively, whereas total trans isomers were 58.6, 70.4, and 70.7%. Reaction rates increased with catalyst ratio and time but were higher for Nysosel 222 than for SP‐10 although 5–10 times less Nyosel 22 was used than SP‐10. Linoleate selectivity ( S 32 ) was almost constant for Nysosel 222, whereas it was higher but fell with time for SP‐10. Increasing the catalyst ratio decreased the time needed to reach the highest oleate selectivity ( S 21 ) ratios, and the IV values where the highest S 21 were attained were different for the catalysts. Increases in m.p. of SP‐10 samples were slower after IV values of 80 were attained, where S 21 ratios reached to higher values. Solid fat contents (SFC) of these samples fell markedly above 21.1°C, and steeped SFC curves were obtained.