Summary
The fatty acid composition of hydrogenated linseed oil has been calculated from the iodine value, ultraviolet absorption with and without alkali isomerization, and the contents of saturated acids determined by the Bertram oxidation method. The hydrogenations are carried out at 160°C. and 235°C. The isomerization effect of the catalyst at the two temperatures is shown by heating the oils with 0.2% Ni-catalyst at 160°C. and 235°C. in CO2-atm. The analyses show:
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1.
At 235°C. the conjugation of the double bonds is very large compared with 160°C.
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2.
The hydrogen seems to serve as an additional activator for the isomerization.
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3.
By hydrogenation at 235°C. 14% conjugated linoleic acid is found in the hydrogenated fat. By 160°C. only 3.6% of the acid is found. The contents of conjugated linoleic acid are due to the isomerization effect of the catalyst.
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4.
By 235°C. the reactions: linolenic→conjugated linolenic→conjugated linoleic→oleic, predominate. By 160°C the reactions: {fx604-1}
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5.
A theory is advanced that the temperature influences the selectivity through the conjugation of the double bonds.
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Lie, J., Spillum, E. Fatty acid composition of hydrogenated linseed oil. J Am Oil Chem Soc 29, 601–604 (1952). https://doi.org/10.1007/BF02631720
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DOI: https://doi.org/10.1007/BF02631720