The color in soy bean oil is removed by four or five treatments at 120°C with 10% - 20% of its weight of north Iowa peat or peat ash. The removal of the color is accomplished with fewer treatments by first mixing the oil with an equal volume of solvent naphtha which is distilled off after the bleaching treatment. Exposure of the oil to strong sunlight, or better to ultraviolet rays, assists in removing the last traces of color.
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Wright, H. V. and Peirce, G. A.
"The Bleaching of Soy Bean Oil with Peat,"
Proceedings of the Iowa Academy of Science, 31(1), 288-288.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/82