Ricinoleic Acid

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Related to Ricinoleic Acid: castor oil

ricinoleic acid

[¦ris·ən·ō¦lē·ik ′as·əd]
(organic chemistry)
C18H34O3 Unsaturated fatty acid; a combustible, water-insoluble, viscous liquid; soluble in most organic solvents; boils at 226°C (10 mmHg); used as a chemical intermediate, in soaps and Turkey red oils, and for textile finishing. Also known as castor oil acid.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Ricinoleic Acid


a monobasic unsaturated fatty acid, CH3(CH2)5CH(OH)CH2CH═CH(CH2)7COOH. It is a colorless, viscous liquid, with a melting point of 5.5°C, a boiling point of 226°–228°C (1.33 kilonewtons/m2), and a density of 0.950 g/cm3 (15°C). It is insoluble in water but freely soluble in alcohol and ether. The ester formed from ricinoleic acid and glycerin is the main constituent (up to 85 percent) of castor oil, from which ricinoleic acid is separated by hydrolysis in a mixture with other fatty acids. Pure ricinoleic acid can be obtained from this mixture, which in industry is itself generally referred to as ricinoleic acid, by low-temperature crystallization from acetone. Esters of ricinoleic acid, for example, butyl ricinoleate, and the salts of the acid esters of ricinoleic acid and sulfuric acid are used as emulsifiers, dispersing agents, and lubricants in the textile industry. Castor oil and the methyl ricinoleate obtained from castor oil serve as raw materials in the preparation of such substances as sebacic and undecylenic acids, heptanal, and 2-n-octanol.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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In the next generation, all the [S.sub.3] seeds of the six [S.sub.2] plants obtained from high oleic acid/low ricinoleic acid [S.sub.2] seeds expressed the character uniformly with oleic acid values ranging from 734 to 832 g [kg.sup.-1] (Table 3, Fig.
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Physical constants: Density [d.sup.15]15 0.9090 Temperature of hardening, [degrees]C -18 Factor of refraction [ND.sup.20] 1.479 Chemical constants: Number of saponification mg KOH/g 176 Acetyl number 146 Iodine number, g [J.sub.2]/100 g 82 Radon number 81 Average molecular weight of fat acids 290 Chemical composition (% mass): Stearin acid (together with dioxystearin acid) 3.0 Oleic acid 8.0 Linoleic acid 3.0 Ricinoleic acid 80.0 Castor oil differs from other fats in solubility and some other properties-high density, big viscosity, and high acetylic number.
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