Waste generation in formaldehyde production

There is basically no wastewater; the waste gases are fed into an exhaust boiler for combustion, and the steam generated is sufficient for use by the formaldehyde production unit, with some excess usually remaining. There is no waste residue!

There are mainly three pathways for the oxidation of methanol to formaldehyde, namely methanol oxidation dehydrogenation, methanol oxidation, and methanol dehydrogenation. The above three processes are the main methods used in industry for synthesizing formaldehyde, with the latter being a new method for producing high-concentration formaldehyde. Both methanol oxidation dehydrogenation and methanol oxidation use oxygen from the air as an oxidant. Since methanol vapor and air can form explosive mixtures, an excess of methanol is used in methanol oxidation dehydrogenation, at the upper limit of the explosive range; that is, the methanol concentration is greater than 36.5% (by volume). For the oxidation of methanol, an excess of air is used to avoid the formation of explosive substances, keeping the concentration at the lower limit of the explosive range; that is, the methanol content is less than 6.7% (by volume). Methanol oxidation dehydrogenation generally uses electrolytic silver as a catalyst, also known as the \"silver method\"” ； The methanol oxidation method, on the other hand, uses a mixture of ferric molybdate and molybdenum oxide as a catalyst; it is also known as the \"iron-molybdenum method\". In both methods, the methanol conversion rate is around 99%, while the selectivity for formaldehyde is 92%. Formaldehyde reacts with ammonia in gaseous form, and when there is an excess of formaldehyde, the exhaust gas is recycled back into the methanol oxidizer. The resulting material can be absorbed by water to produce a formalin solution with a concentration of 37%-45%. The waste gas, as mentioned earlier, is sent to a flare for combustion to generate low-pressure steam (usually at 4 KGF), which is used for internal purposes; thus, there is basically no wastewater, only the exhaust gas from the flare combustion. The wastewater comes from floor washing and tank cleaning water in parking areas, and is discharged intermittently. Estimated at 5 tons per day (150,000 tons per year for a 37% formaldehyde scale), mainly containing formaldehyde and related substances. Recently, our company has also wanted to undertake this project. As one of the project leaders, I have obtained some information from the technical provider, and I hope it will be useful to the original poster.

There is no wastewater; waste gas can be burned to produce steam. The exhaust gas generated in the production of 1 ton of formaldehyde can be burned to yield 300–400 kilograms of steam, at a pressure of 0.4 MPa

For the 3rd floor, the amount of wastewater generated from workshop washing is way too high

Experts, please provide information on the composition, temperature, and pressure of the exhaust gases generated during formaldehyde production. I think it’s possible to recycle some of the components. I appreciate your help. Thank you!

In fact, many companies have started to produce formaldehyde, urotropine, and so on! ! You can ask about technical stability! ! Most of the exhaust fumes are burned! ! But you can start a second business! ! Bathing! !

There are basically no waste items generated, right? With the high level of automation these days, there’s no problem

Regarding the three types of waste generated in perstop’s formaldehyde production: 1. Waste water – virtually none. 2. Exhaust gas, which mainly contains methanol, formaldehyde, formic acid, dimethyl ether, and carbon monoxide; catalytic combustion using precious metals produces 8S vapor. 3. Heat: Significant heat is generated during the oxidation of methanol, which can produce 8S vapor. Together with the vapor produced by the combustion of exhaust gases, this amount far exceeds the needs of formaldehyde production facilities; if this heat is utilized externally, it can generate considerable income.