introduction preparation of_formaldehyde
TRANSCRIPT
Formaldehyde
Prepared by:Sarthak modi(13BCH051)Fenil shah(13BCH052)
Topics:
INTRODUCTION
Forms of Formaldehyde
Hazards of Formaldehyde
Production
Manufacturers of formaldehyde
INTRODUCTION Formaldehyde is a naturally occurring compound with the formula
CH2O or HCHO. It’s IUPAC name is methanal.
Molecular weight - 30.03
Flash point – 60 0C
It is a colorless gas with poisonous odor. It is easily miscible with
water.
Its Boiling point is 96 0C & Melting point is -15 0C.
Commercial formaldehyde is produced & sold as an aqueous
solution containing 37 to 50 % formaldehyde by weight.
Formaldehyde is the primary cause of methanol's toxicity, since
methanol is metabolized (metabolism – The complete set of
reactions that occur in living cells.) into formaldehyde by alcohol
dehydrogenation.
Formaldehyde does not accumulate in the environment, because it
is broken down within a few hours by sunlight or by bacteria
present in soil or water.
Humans metabolize formaldehyde quickly, so it does not
accumulate, and is converted to formic acid in the body.
Formaldehyde can result from combustion of carbon compounds
like; wood products, tobacco, automobile exhaust etc.
Sunlight and bacteria in the environment break down formaldehyde
The human body quickly metabolizes formaldehyde converting it
into formic acid
Formic acid in large amounts and concentrations can be harmful
Ant bites contain formic acid
Forms of formaldehyde : Formaldehyde is more complicated than many simple carbon compounds in
that it adopts several different forms.
One important derivative is cyclic trimer metaformaldehyde or 1,3,5-
trioxane with the formula (CH2O)3.
There is also an infinite polymer called paraformaldehyde. These compounds
have similar chemical properties to the molecule CH2O.
A saturated water solution, of about 40% formaldehyde by volume or 37% by
mass, is called "100% formalin".
When dissolved in water, formaldehyde forms a hydrate, methanediol, with
the formula H2C(OH)2.
Hazards of formaldehyde: In classifying the hazards of formaldehyde, at least the following
hazards are to be addressed by the employer:
Cancer;
Skin and respiratory sensitization;
Eye, skin and respiratory tract irritation;
Acute toxicity effects;
Flammability
Production of formaldehyde:1. Formaldehyde is produced industrially by the catalytic oxidation
of methanol.
The most common catalysts are silver metal or a mixture of
an iron and molybdenum or vanadium oxides.
In the commonly used formox process, methanol and oxygen react
at 250–400 °C in presence of iron oxide in combination with
molybdenum and/or vanadium to produce formaldehyde according
to the chemical equation:
2. The silver-based catalyst usually operates at a higher temperature,
about 650 °C. Two chemical reactions on it simultaneously
produce formaldehyde: that shown above and
the dehydrogenation reaction:
3.In principle, formaldehyde could be generated by oxidation
of methane, but this route is not industrially viable because the
formaldehyde is more easily oxidized than methane.
4. Calcium formate is heated at high temperature for the production of
formaldehyde.
5. Formaldehyde can also be generated by the reaction of ethene with
ozone in the presence of Pd catalyst.
Manufacturer of formaldehyde in world Annual production volume of main producers of formaldehyde
1) BASF-Germany(720)
2) Dynea, the Netherlands(650)
3) Perstorp Formox, the Netherlands(550)
4) Bayer, Germany(271)
5) Ercros, Spain(400)
Manufacturer of formaldehyde in India Aldehydes India group-150 MT per day
Kothari group
Balaji Formalin pvt. ltd.-2500 MT per month
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