Concentrated Recycling Technology of Formaldehyde
Proprietary Technology and Plants
In the production of paraformaldehyde and polyoxymethylene, high
concentrations of formaldehyde are required as raw materials. But
the normal formaldehyde production, whether it is silver or iron
molybdenum, the product concentration is not more than 55%. So the
need for raw materials for dehydration dehydration enrichment, and
enrichment process will produce dilute formaldehyde.
Dioformaldehyde is usually used to produce downstream products
(such as urotropine, methylal, etc.) that are not required for
formaldehyde feedstock concentrations and enrichment and recycling.
Commonly used dilute formaldehyde concentration recovery technology
there are two, respectively, decompression flash separation process
and pressurized distillation enrichment process. The former in the
concentration process will once again produce about 8% of the
dilute formaldehyde; the latter can be recovered 36-46% of the
formaldehyde solution, but in the pressurized distillation process,
with the increase in pressure, formaldehyde prone to
disproportionation reaction Formic acid, which will not only cause
formaldehyde loss, more importantly, formic acid will seriously
corrode the equipment, although this problem can be selected by the
higher grade of special steel to solve, but the investment will be
too high, very economical.
I company dilute formaldehyde enrichment recovery technology, in
the pressurized distillation method on the basis of the process and
equipment, such as internal technical improvements, resulting in
reduced corrosion, equipment investment reduction, and integrated
with the tower and tower Heat load, production and energy
consumption greatly reduced.
95 tons / day 22% dilute formaldehyde concentrated recovery as an