– Phenol popularly known as Cardanol is the active constituent
of Cashew Nut Shell Liquid and is a monohydroxy phenol having a
long hydrocarbon chain (C15H27) in a Meta position.
Cardanol is a meta substituted alkenyl phenol, derived from
naturally occurring phenol viz. cashew nut shell liquid (CNSL).
Distillation of CNSL under reduced pressure gives cardanol. The
residue will be rich in cardanol and is generally known as
residol,which is conveniently used in the preparation of
friction dust for brake linings, and also in rubber compounding
extracted by cold extrusion method is reported to contain
approximately 70% anacardic acid, 18% cardol and 5% cardanol and
the balance consisting of substituted phenols and less polar
Derivatives of cardanol find applications in form of dyestaaffs,
plasticizers, and ion-exchange resin.
Cardanol is a unique natural source for unsaturated long-chain
phenols. It is a cheap and renewable material, obtained by
vacuum distillation of cashew nut shell liquid.
Industrial grade cardanol is a yellow oil containing mostly
cardanol with smaller percentages of cardol and methylcardol,
obtained by thermal treatment and subsequent distillation of
cashew nut shell liquid available in large amounts in some
Cardanol, an excellent monomer for polymer production, has been
isolated from CNSL and allowed to react with formaldehyde in a
particular mole ratio in the presence of glutaric acid catalyst
to give high-ortho novolac resin.
is widely used in the manufacture of surface coatings,
Insulaating Varnishes, Oil and Alcohol soluble resins,
Laminating resins, Rubber compounding, Azo dyes, etc.
or Cardanol derivatives are extensively used in the laminating
industry for reducing brittleness and improving the flexibility
of the laminates.
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