The document discusses various uses of formaldehyde including: - Making resins used in building materials, paper coatings, and synthetic fibers. - Producing other chemicals by using formaldehyde as a starting material. - Appearing in tobacco smoke and fuel combustion smoke. - Being used in pressed wood products, fertilizers, mortuary preservatives, and disinfectants. The document also includes a block diagram of the formaldehyde production process from methanol.

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16. • Formaldehyde is used mostly to make resins
used in building materials, coatings for
paper and clothing fabrics, and synthetic
fibers.
• A second major use is as a starting chemical
to make other chemicals. It is found in
smoke from burning tobacco or fuels.
• Building materials with formaldehyde
include certain insulation materials, glues,
and pressed wood products like particle
board, plywood, and fiberboard.
• Products containing urea and formaldehyde
are used as slow-release nitrogen fertilizers
in farming and gardening.
• Formaldehyde is also used as a preservative
in mortuaries and medical laboratories, and
as an antimicrobial agent and disinfectant
for industrial processes and some
household purposes.

17. The block diagram of
formaldehyde production from
methanol
The blocks in the model are divided in three sections. The first section contains the mixer that mixes
methanol, water and air; the evaporator and the heat exchanger which heats up the gas stream using
superheated steam. The second section contains the reactor and the heat exchanger which cools down the
stream to 150°C. The third and last section contains the absorption column, the splitter and four heat
exchangers

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