ID: 0579
DATE: 2020/03/13
GOODS NAME: Formaldehyde Plant
HS CODE:
DETAILS:
| Molecular Formula | CH2O |
|---|---|
| Chemical structure |  |
| Synonym | Methanal, Methyl aldehyde, Methylene oxide |
| CAS No | 50-00-0 |
| EINECS No | 200-001-8 |
| INCI name | Formaldehyde |
Chemical and Physical Properties:
| Appearance | Liquid |
|---|---|
| Odour | Pungent, Suffocating |
| Density (g/mL,20℃） | 1.08 |
| Vapor Density (g/mL ,Air=1) | 1.03 |
| Melting Point (oC) | -15 |
| Boiling Point (oC) | 98 |
| Flash Point (oC) | 60 |
| Burning Point (oC) | 300 |
| Vapor Pressure (kPa, @20oC) | 2.4 |
| Volatility (w/w) | 100% |
| Solubility | Easily soluble in water. Soluble in diethyl ether, acetone, alcohol |
Application:
1, Production of many more complex compounds and materials for industrial use, incl. Urea formaldehyde resin, melamine formaldehyde resin, phenol formaldehyde resin, polyoxymethylene plastics, 1,4-butanediol, methylene diphenyl diisocyanate and etc.
2, Preserving or fixing tissue or cells
3, Identifying alkaloids and other compounds in drug testing
4, Fighting bacteria
Metal oxide formaldehyde production consists of gas compression, methanol vaporization, methanol oxidation, formaldehyde absorption and off gas treatment.
Gas compression: after the air is filtered and pressurized by the fresh air blower, it is evenly mixed with the circulating off gas returned from the absorption tower to form the mixture gas. The mixture is pressurized to a suitable pressure by a circulating blower and sent to the top of the methanol vaporizer.
Methanol vaporization: methanol from the raw material tank enters the methanol vaporizer, which is atomized into the mixture through the atomizing nozzle, and vaporizes and overheats through the methanol vaporizer from top to bottom. The heat sources of the upper and lower parts of the methanol vaporator are circulating solution in column one and the high-temperature gas at the outlet of the reactor.
Methanol oxidation: the superheated raw gas enters the top of the reactor. The reactor has a heat exchange tube containing iron and molybdenum catalyst. Methanol reacts with oxygen under the action of catalyst to produce formaldehyde and give off a lot of heat. The heat of reaction vaporizes the heat conducting oil within the reactor. After vaporization, the heat conduction oil is condensed in the condenser and returned to the reactor while the by-product steam is produced.
Formaldehyde absorption: the high-temperature mixture from the bottom of the reactor first passes through the methanol vaporator for cooling, and then goes into the absorption section for recycling absorption. The absorption section is divided into two formaldehyde absorption columns. Qualified formaldehyde products are extracted from the bottom of the absorption column one.
Off gas treatment: absorb the off gas from the top of the second column, and some of it will return to the fresh air blower outlet, and the other part will enter the ECS reactor. In off gas, carbon monoxide, dimethyl ether and methanol react with precious metal catalyst to produce carbon dioxide and water, and the by-product steam is sent out.
