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General
- Stearic acid
(IUPAC systematic name: octadecanoic acid) is a saturated fatty
acid that occurs in many animal and vegetable fats and oils.
- Stearic acid
is a waxy solid, and its chemical formula is C18H36O2 .
- The salts
and esters of stearic acid are called stearates.
- It is
practically insoluble in water], fairly soluble in chloroform and
decreasingly soluble in CS2, C6H6,CCl4,CH3CH2OH and CH3 – O – CH3.
Process
- Stearic
acid occurs in most fruit flesh and seed fats and in marine
animal oils.
- Stearic
acid is prepared by treating animal fat with water at a high
pressure and temperature, leading to the hydrolysis of
triglycerides.
- It can
also be obtained from the hydrogenation of some unsaturated
vegetable oils.
- Common
stearic acid is actually a mix of stearic acid and palmitic
acid, although purified stearic acid is available separately.
Application
- Stearic
acid is used as plasticizer, softener, water – proofing agent,
polishing agent, oiling agent and antisatatic agent .
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Potassium salts of fatty acids with excess stearic acid give a
slow drying lather for shaving soap.
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Derivations of stearic acid are used in manufacture of
Soaps,Metallic salts, Stearoyl chlorides, Bromide, Steramide,
Stearonitrile, Stearyl alcohol.
- In
fireworks, stearic acid is often used to coat metal powders
such as aluminium and iron.
- Stearic
acid is used along with simple sugar or corn syrup as a
hardener in candies.
Report
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Stearic acid undergoes the typical reactions of saturated
carboxylic acids, notably reduction to stearyl alcohol, and
esterification with a range of alcohols.
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Stearic acid’s neutral effect on blood total and LDL
cholesterol levels implies that this long-chain SFA may not
increase the risk for cardiovascular disease.
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