Formaldehyde
| 원료 | Methanol | ||||||||||||
| 생산물 | formaldehyde | ||||||||||||
| 적용 | To produce aqueous formaldehyde (AF) or urea formaldehyde precondensate (UFC) from methanol using Haldor Topsoe A/S FK-2 iron/molybdenum-oxide catalyst. | ||||||||||||
| 설명 | Description: The process is carried out in a recirculation loop at low pressure (0 to 6 psig) (1 to 1.5 bar abs). Vaporized methanol is mixed with air and recycle gas that were boosted by the blower (1). The mixture may be preheated to about 480℉ (250℃) in the optional heat exchanger (2) or it may be sent directly to the reactor (3). In the reactor, methanol and oxygen react in the catalystfilled tubes to make formaldehyde. Reaction heat is removed by an oil heat transfer medium (HTM). The reacted gas exits the reactor at approximately 540℉ (290℃) and is cooled in the LP steam boiler (4) to 260℉ (130℃) before entering the absorber (5). In the absorber, the formaldehyde is absorbed in water or urea solution. Heat is removed by one or two cooling circuits (6, 7). From the lower circuit (6) either aqueous formaldehyde or UFC is withdrawn. Gas for recycling is withdrawn from the absorber, whereas the remaining gas is further scrubbed with fresh water or urea solution in the absorber top section before being catalytically incinerated in the reactor (8). The tail gas purity applies to the environmental standards of any country. Hot oil vapor from heat transfer system is used in the gas preheat (2) and heat recovery (9); e.g., 300 psig (20 bar) steam production. Steam produced by the reactor effluent exchanger (4) is used in the methanol evaporator (10) and in the boiler feedwater preheater (11). Small capacity plants (e.g., 27 metric tpd) are package-supplied. Yields: An adiabatic post converter can be installed to increase yield and reduce formic acid by production down to 0.01 wt %. |
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