Chemical Technology and Analysis of Oils, Fats, and Waxes

Chemical Technology and Analysis of Oils, Fats, and Waxes

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...strictly the same in all instruments, he having found for a sample of lard in three instruments 4J, 6, and 11 respectively. 3 Journ. Amer. Own. Soe. 1902, 754. 4 Journ. Soc. Chem. Ind. 1898, 1023. for butter fat is 0-55 scale divisions (" degrees") for each degree Centigrade but this correction would not be applicable to other oils and fats. In order to avoid complications, it is best to make all observations at a definite temperature, to be agreed upon. It is advisable to adopt 40 C. as the standard temperature. Most oils and fats are liquid at 40 C., and only in exceptional cases, such as beeswax, a higher temperature will be required. But whatever temperature be chosen, the temperature must be distinctly stated. The presence of free fatty acids in oils and fats appears to affect the refractive index to a marked degree. Thus a sample of Californian olive oil,1 containing 44-4 per cent of free fatty acids, had the refractive index 1-4672, whereas the corresponding value for a large number of less acid samples was 1-4711. The following table contains a number of values, obtained by means of an Abbe refractometer, the oleo-refractometer, and the butyro-refractometer respectively, which I have arranged, following the system of classification adopted in this work, in the order of the iodine values of the oils, fats, and waxes, so that it may be seen at a glance whether a correlation can be established between the iodine number and refractive power. No definite relation, however, can be established. It is remarkable that the oils belonging to the class "Terrestrial Animal Oils " deviate to the left in the oleo-refractometer, and it would appear as if terrestrial animal oils could be readily differentiated from vegetable oils by...show more

Product details

  • Paperback | 140 pages
  • 189 x 246 x 8mm | 263g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236602730
  • 9781236602732