Description
1 what is glycerin? Glycerol (or glycerin, glycerine) is a simple
polyol compound. It is a colorless, odorless, viscous liquid that
is widely used in pharmaceutical formulations. Glycerol has three
hydroxyl groups that are responsible for its solubility in water
and its hygroscopic nature. The glycerol backbone is central to all
lipids known as triglycerides. Glycerol is sweet-tasting and of low
toxicity.
2 Applications: (1) Food industry: (2) Pharmaceutical and personal
care applicationsGlycerol is used in medical and pharmaceutical and
personal care preparations, mainly as a means of improving
smoothness, providing lubrication and as a humectant(3 )Surface
science: Glycerol is shown to reduce the coefficient of friction of
polymer coated surfaces by several orders of magnitude. This effect
is attributed to the enhanced viscosity of glycerol-water solutions
as compared to the pure water(4) Botanical extracts: When utilized
in 'tincture' method extractions, specifically as a *0% solution,
glycerol prevents tannins from precipitating in ethanol extracts of
plants (tinctures). It is also used as a substitute for ethanol as
a solvent in preparing herbal extractions(5) AntifreezeGlycerol was
historically used as an anti-freeze for automotive applications
before being replaced by ethylene glycol, which has a lower
freezing point. While the minimum freezing point of a
glycerol-water mixture is higher than an ethylene-glycol mixture,
glycerol is not toxic and is being re-examined for use in
automotive applications (6) Chemical intermediateGlycerol is used
to produce nitroglycerin, or glycerol-trinitrate. Reliance on
soap-making to supply co-product glycerine made it difficult to
increase production to meet wartime demand. (7) Fuel glycerol can
be used as an alternative to diesel
3 Specification: Index nameIndexGrade Super gradeTop gradeFirst
gradeSecond grade Chroma ≤ *******0Assay % ≥ *9.**8.****5Density
(*0 C)g/ml ≥ 1.****1.***2 1.***9 1.***1Chloride Assay (as Cl, %)≤
0.***0.***0.**0.*5Sulfating Ash (%) ≤ 0.**0.**0.**0.*1Acidity or
Alkalinity (mmol/**0g) ≤ 0.***0.***0.*0.3Saponification equivalent
(mmol/**0g) ≤ 0.**0.***3Heavy metals Assay (as Pb, mg/kg) ≤ ***5As
(as As, mg/kg) ≤ ***2 Crude Glycerine *0% *0% *5%
