Formaldehyde, colorless and irritating gas, chemical formula HCHO or CH2O, molecular weight 30.00, also known as formic aldehyde. Colorless, it has a stimulating effect on the eyes and nose. The gas has a relative density of 1.067 (air = 1) and a liquid density of 0.815 g/cm3 (-20 ° C). Melting point -92 ° C, boiling point -19.5 ° C. Soluble in water and ethanol. The concentration of the aqueous solution can be up to 55%, usually 40%, and is called formalin, commonly known as formalin. Reducing, especially in alkaline solutions, the ability to reduce is stronger. It can burn, vapor and air form an explosive mixture with an explosion limit of 7% to 73% by volume. The ignition point is about 300 °C. It can be obtained by dehydrogenation or oxidation of methanol under the catalysis of metals such as silver or copper in Formaldehyde Equipment, and can also be separated from the oxidation products of hydrocarbons. It can be used as a raw material for phenolic resin, urea-formaldehyde resin, vinylon, urotropine, pentaerythritol, dyes, pesticides and disinfectants. Industrial formaldehyde solution generally contains 37% formaldehyde and 15% methanol as a polymerization inhibitor with a boiling point of 101 °C.
Formaldehyde Production Process
In the Formaldehyde Production Process, in order to be safer, more efficient, less expensive, and extend the driving cycle, it is important to pay attention to it.
Do all the preparatory work before driving, and check the maintenance of water, electricity, steam and equipment;
It is necessary to turn off the good raw materials, unqualified methanol does not unload the goods, and avoid direct poisoning of the catalyst;
Air filtration should be thorough, change the air filter bag frequently, and regularly check and replace the ternary high-efficiency filter;
Circulating water and steam drum water should be treated with reverse osmosis to prevent impurities from entering the catalyst chamber, resulting in increased system resistance;
Strictly control the process parameters, adjust the aerobic ratio and the concentration of the ingredients. When the alcohol content is 0.5% and the acid content is 0.006% or less, the oxygen temperature is controlled at about 625 °C;
When emergency stop is caused by power failure, it is necessary to change the call and return to the vehicle;
If the catalyst is poisoned or the resistance is too large, 10 kg of catalyst can be extracted per square, and then 6 to 8 kg of new catalyst can be replenished per square.
When the ignition is started, the ratio of aerobic to alcohol should be controlled, and the temperature increase should be increased steadily. Do not overheat;
Do routine maintenance, daily inspections, and find problems in a timely manner;
To do the above, we usually have a driving cycle of three to four months, and a cycle of 37% formaldehyde consumption is 440 kg.
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