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Methanol Industry(C1)

Paraformaldehyde (Spray Dryer Process)
Paraformaldehyde (Spray Dryer Process)

Paraformaldehyde (Spray Dryer Process)

The PF process is that formaldehyde concentration is improved to 85% via level two condensation, then pumped into spray dryer. The high concentrated formaldehyde is sprayed via nozzle, condensed to grainy formaldehyde solid, then dried through fluidized bed dryer, finally 92% paraformaldehyde comes out. This process is with continuity and short prilling time for high concentrated formaldehyde, which forms into short linear formaldehyde molecular chain, thus with good product solubility.

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Introduction

The PF process is that formaldehyde concentration is improved to 85% via level two condensation, then pumped into spray dryer. The high concentrated formaldehyde is sprayed via nozzle, condensed to grainy formaldehyde solid, then dried through fluidized bed dryer, finally 92% paraformaldehyde comes out. This process is with continuity and short prilling time for high concentrated formaldehyde, which forms into short linear formaldehyde molecular chain, thus with good product solubility.
Too high temperature will make formaldehyde having Connie’s reaction. So normal formaldehyde condensation adopts vacuum dehydrating.
Dilute formaldehyde recycling process: adopting the lates SL-TECH technology on methylal reactive distillation.
Drying system: adopting insert gas circulating drying and negative pressure control, dealing the problem of bad environment in workshop and system safety risks.
Technical Features
The spraying prilling process can control the formaldehyde content between 92~96%, loose and good solubility, short depolymerization time. The new type PF plant brought out by SL-TECH is very popular, the features are as follows:
The advanced concentration and dryer process is adopted, with good quality and low expense, mature and reliable technology. The plant is completely nationally made, it can compare with the biggest PF producer in the world.
In the technology, formaldehyde condensation system research, the spraying tower design, the nozzle design and catalyst choosing are attached high importance to.
The dilute formaldehyde recycling of paraformaldehyde condensation system makes methylal, further becomes methylal solution with more additional value, the continuous and circular usage is the biggest characteristic of the plant energy saving, At the same time, it requires low consumption, comparing to the same career at home, the product is with low cost and competitiveness in the market.
Paraformaldehyde specification

S/N

Item

Process index

Note

1

PF content

92% w/w

Normally 92%

2

Formic acid

＜0.03%

 

3

Melting range

120~170℃

 

4

Ash content

＜100 ppm

 

5

Appearance

White powder

 

6

Methanol content

＜1 wt%

 

7

Free water

＜8 wt%

 

8

Iron content

＜2 ppm

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