Edible Oils and
Fats - Role of GOODEARTH Bleaching Earths
the advent of twentieth century Bleaching Earths have been
used for the refining of edible oils and fats. Despite of
technological advances over the years the application of
Bleaching Earths is still of great importance today. Edible
oils and fats are prominent items of consumption in every
household throughout the world. The present production is
substantial and according to reliable predictions, a further
rise in production and demand is to be expected for the coming
decades. These figures demonstrate the significance of
Bleaching Earth in relation to supply of nourishment to
world's increasing production.
Earths are appreciated for their power to de-colourise edible
oils and fats. But times are changing and attention is now
being focused on the achievement of refined oils with enhanced
shelf life in terms of flavour and odour stability. Bleaching
Earths play an important role in reducing the level of
pigments, trace metals, phosphatides, residual soaps,
oxidation products and enhance the stability of fully refined
getting more and more health conscious all over the world.
They are looking for food items fully refined and rendered
free of harmful ingredients. Highly Activated Bleaching Earths
remove oxidation products from oils and fats which threaten to
clog arteries leading to heart ailments. Physical refining is
not able to achieve this task satisfactorily and as such the
oil mills have to resort to refining by Bleaching Earths side
context, it is said that, Bleaching Earths play an important
role in promoting longer life.
(Fast Filtration) is best suited for application in this
of Mineral Oils
Re-refining of lubricants is increasing in popularity in the
waste oil regeneration process. After primary purification and
dehydration process, waste oil is given heat treatment at
approximately 300 C to achieve decomposition of additives.
Then treatment with Sulphuric acid for separation of acid tar
precipitates follows. Subsequently it is subjected to contact
distillation i.e. treatment with Bleaching Earth at 300 C
under vacuum. Under these very dry drastic conditions
Bleaching Earth acts both as cracking catalyst and as an
adsorbent. During the cracking process long chain polymers and
oxidized components are first split and then removed by
distillation. Non volatile impurities e.g. acid tar and acid
sludge as well as sulphonic acids are adsorbed. The re-refined
lubricating oil can be used to produce a high grade lubricant.
active grade viz
is suitable for this application.