ADIPIC ACID.
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Written by tom
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Friday, 29 February 2008 |
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Also called butane dicarboxylic acid. A white crystalline solid of the composition HOOC(CH2)4COOH, used as a plasticizer in synthetic resins and coatings, and in the production of nylon. It is made by the treatment of fatty acids with nitric acid, or can be made by oxidizing cyclohexanol.
The melting point is 152°C. It is soluble in alcohol and slightly soluble in water. Many other dibasic acids useful for making synthetic resins are produced readily from fatty oils. Subei·ic acid HOOC(CH2)6COOH, is made by the oxidation of castor oil. It is the same as the octane-dioic acid made from butadiene. Sebacic acid,HOOC(CH2)8COOH, is produced by heating castor oil with sodium hydroxide. Azelaic acid, HOOC(CH2)7COOH, is a strong dibasic acid with melting point at 106°C, made by the oxidation of oleic acid, and is used as a substitute for phthalic anhydride to react with glycerin to form alkyd resins less hard and brittle than those made with phthalic anhydride. It is also used instead of sebacic acid for producing the high-temperature lubricant ethylhexyl sebacate. Another substitute for this acid is pelagonic acid. Petroselic acid, which is an isomer of oleic acid with the double bond in a different position, is made by the hydrogenation of the ricinoleic acid of castor oil, and is then oxidized to produce adipic acid. Adipic acid can
be used as a substitute for citric acid for the acidulation of beverages, but is less water-soluble. It is also used in protein foods to control the gelling action.
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Last Updated ( Saturday, 01 March 2008 )
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