Spray Dryer Paraformaldehyde Plant

Utilizing a spray dryer process, the formaldehyde content can be controlled by up to 92~96%, with porosity, good water solubility and short depolymerization time. Using our production technology, we attach great importance to the research and development of formaldehyde condensation systems, the spraying tower design, the spraying head design and catalyst selection. The continuous circulation use is the most important characteristic, and the low concentration of formaldehyde can be collected and reused to produce a methylal solution with higher value.

Flow chart Paraformaldehyde Processing Equipment The first- efficiency evaporator The second-efficiency separator Separator Buffer tank Vacuum washing tower Desalted water Air washing tower Vibrating fluid-bed drier Cyclone Separator Off-gas washing Tower Advantages The theory for first-efficiency evaporator is climbing film evaporation. The second-efficiency separator theory is the falling film evaporation. The off gas from the second-efficiency separator comes is a 1# absorber for absorption, creating a diluted formaldehyde solution. Paraformaldehyde Production Process Concentrate 50%-55% formaldehyde solution. Further concentrate the formaldehyde solution to 85%. Condense and dewater the 85% high concentration formaldehyde solution. The solid paraformaldehyde from the spraying cooling tower and cyclone dust collector comes into fluidized-bed drying for the second drying. Off gas absorption.

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

The Specification of Paraformaldehyde

Item	Index	Remarks
Paraformaldehyde content	92-96% w/w	Normally 92%
Formic acid	＜0.03%
Melting range	120-170℃
Ash content	＜100ppm
Appearance	White powder
Methanol content	＜1wt%
Free water	＜8wt%
Iron content	＜2ppm

Raw material specification

Item	Specification
Formaldehyde	50.0%wt
Desalted water	Conductivity no more than 10μs/cm，P≥0.3mpa
Steam	0.4MPa
Steam	0.8MPa
Electricity	380V
Circulating water	30~38℃ ，0.25mpa
Cooling water	-1~3℃ ，0.25mpa
Instrumental air	0.7MPa
Nitrogen	0.7MPa

Consumption index

Item	Consumption quota	Remarks
Raw material and auxiliary material
Formaldehyde（50％）	2.665T/T
Dilute formaldehyde（19％~24％）	-2.2T/T	By-product dilute formaldehyde
Utilities
Circulating water t≤32℃，△t=10℃	288T/T
Dynamic electricity（380V）	280kWh/T
low pressure steam P=0.4MPa（G）	1.30T/T
low pressure steam P=0.8MPa（G）	0.90T/T
cooling water-2℃，△t=5℃	120T/T
soft water	0.2T/T
instrumental air P=0.7MPa（G））	48Nm3/T
Nitrogen P=0.7MPa（G）	99Nm3/T

Projects Were Work on