Product qualities
Quality of the products obtained in the standard plants:
1. The 37 % aqueous solution has following characteristics:
| formaldehyde |
37 % b.w.
|
| methanol |
less than 0.8 % b.w.
|
| acidity (as formic acid) |
less than 0.03 % b.w.
|
| iron |
less than 0.25 ppm
|
| appearance |
clear, colorless liquid
|
2. The medium concentration aqueous solution has following characteristics:
| formaldehyde |
45 % b.w.
|
| methanol |
less than 1 % b.w.
|
| acidity (as formic acid) |
less than 0.04 % b.w.
|
| iron |
less than 0.5 ppm
|
| appearance |
clear or slightly haze, colorless liquid
|
3. The high concentration aqueous solution has following characteristics:
| formaldehyde |
51±1 % b.w.
|
| methanol |
less than 1 % b.w.
|
| acidity (as formic acid) |
less than 0.04 % b.w.
|
| iron |
less than 0.5 ppm
|
| appearance |
clear or slightly haze, colorless liquid
|
4. The urea stabilized solution has following characteristics:
| formaldehyde |
49 % to 59 % b.w.
|
| urea |
21 % to 26 % b.w.
|
| water |
the balance
|
| pH |
8 – 8.5
|
| viscosity at 20 °C |
10-50 cP
|
| density at 20 °C |
1.25 – 1.29 Kg/lt
|
| appearance |
clear to yellowish liquid
|
| stability at temperature below 50°C |
beyond 3 months
|