Formic acid,
also called methanoic acid), is the simplest and has the lowest mole weight of
the carboxylic acids, in which a single hydrogen atom is attached to the
carboxyl group (HCOOH). If a methyl group is attached to the carboxyl group, the
compound is acetic acid. It occurs naturally in the body of ants and in the
stingers of bees. Functionally, it is not only an acid but also an aldehyde; it
reacts with alcohols to form esters as an acid and it is easily oxidized which
imparts some of the character of an aldehyde. Pure formic acid is a colorless,
toxic, corrosive and fuming liquid, freezing at 8.4 C and boiling at 100.7 C. It
is soluble in water, ether, and alcohol. It irritates the mucous membranes and
blisters the skin. It is prepared commercially from sodium formate with the
reaction of condensed sulfuric acid. Formic acid is used as a chemical
intermediate and solvent, and as a disinfectant. It is also in processing
textiles and leathers, electroplating and coagulating latex
rubber.
Methyl
formate, methyl ester of formic acid, is a clear liquid
with a pleasant odor; very soluble in water and miscible
with most organic solvents. It is readily hydrolyzed
by water. Commercial methyl formate is produced from
methanol with carbon monoxide in the presence of strong base.
The predominant use of methyl formate
is in the preparation of formamide
and dimethylformamide. They are used as important
solvent for PUR coatings, imitation
leather and for the production of PAN fibres.
They are used as a reaction medium for
the pharmaceutical preparation. Methyl formate
is used as the raw material of formic acid
which find application as a chemical intermediate
and solvent, in processing textiles, leathers,
electroplating, in coagulating latex rubber,
and as a disinfectant. This ester has the properties
of high volatility, high vapor pressure, low viscosity and low
surface tension. Accordingly, it is commonly
used as a component of the solvent system to
achieve quick drying coating finishes and in
spray applications. It is used as a component
of azeotrope to recover expensive solvents. It
is also used as a blowing
agent for expanded synthetic rubbers. It is
used as an intermediate to
manufacture various organic chemicals including pharmaceuticals,
optical brighteners and hydrocyanic acid.
|