Vacuum Rake Dryer Paraformaldehyde Plant

Vacuum Rake Dryer Paraformaldehyde Plant
Vacuum Rake Dryer Paraformaldehyde Plant
Vacuum Rake Dryer Paraformaldehyde Plant
Vacuum Rake Dryer Paraformaldehyde Plant
Vacuum Rake Dryer Paraformaldehyde Plant
Vacuum Rake Dryer Paraformaldehyde Plant
Vacuum Rake Dryer Paraformaldehyde Plant
Vacuum Rake Dryer Paraformaldehyde Plant
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The vacuum drying process is a traditional production process to produce paraformaldehyde. It is simple and efficient, with minimal loss of formaldehyde and particulate matter.

Helipont promotes the drying process by updating the scraper condensation with the first-efficiency evaporator, which condenses the 50% formaldehyde to 75%. The concentrated formaldehyde then comes into the rake dryers for further dewatering, finally resulting in paraformaldehyde.

The off gas discharged from the rake dryer includes steam and formaldehyde steam. It can be absorbed via condensation absorber tower to produce a diluted formaldehyde solution, which can be reused in the latter process.

Flow chart
Paraformaldehyde Processing Equipment
  • Rake dryers
  • Drying absorber tower
  • Evaporator
  • Separator
  • Buffer tank
  • Distillation kettle
  • Discharging machine
Advantages
  • The theory for first-efficiency evaporator is climbing film evaporation
  • The diluted 10-15% formaldehyde solution from the drying process can be reused. It can be used to produce methylal, urotropine or mixed to 37% formaldehyde for sale.
  • It is batch form operation. Each batch feed for rake dryer is around 4-5m3, drying time: 4-6 hours.
Paraformaldehyde Production Process
  • Condense the 50-55% formaldehyde solution;
  • Drying and further dewatering.
  • Treatment of the off gas (including steam and formaldehyde steam).

If you want to know more about the production process in details, please contact us.

Specification of Paraformaldehyde
Name Process Index Remark
Paraformaldehyde content 93-96%w/w Normally96%
Formic acid <0.03%
Melting range 120-170℃
Ash content <100ppm
Appearance White powder
Methanol content <1wt%
Free water <1wt%
Iron content <2ppm
Paraformaldehyde Plant (as per 93%-96%) Consumption Index
Item Specification In one company
Methanol Pure99.5% ≤1280 kg/t(without dilute formaldehyde)
Steam 0.4MPA ≤2,250 kg/t
Electricity 380V ≤130 kWh/t
Dilute formaldehyde (19~22%) -2,200 kg/t
Circulating water 30~38 400 m3/h

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