Process parameters formaldehyde yield

Later, a few small plants were built, the process parameters for which were, apparently, quite different. According to [262], the process occurred without catalyst. In this case, natural gas containing 25% ethane yielded a liquid product containing 35% methanol, 20% formaldehyde, 5% acetaldehyde, and some amounts of acetone and dimethyl acetal. According to [263], 1 m of natural gas containing 60% methane (the rest, propane and butane) was... 

With reference to the formaldehyde reactor, assuming the parameters reported in Table 28.5, the simulations showed that the HCHO molar yield could be incremented from the 93.6%, reported for an optimized packed-bed reactor process,up to over 97% if aluminum-washcoated honeycombs with suitable design were loaded in the original reactor tubes. The optimal performance of the monolith catalysts originates... 

The works [158,185—188] investigated the effect of various parameters on the reaction onset temperature and the yield of the products. At pressures of 1 and 5 atm, the increase of the initial concentration of NO to 1% significantly, by 100 °C, decreased the temperature of the process, although the maximum obtainable conversion of methane was almost the same. However, the increase of the NO concentrations to 1.5% produced practically no effect. At these pressures, the selectivity of formation of oxygenates (methanol, formaldehyde, and nitromethane) reached a maximum at an NO concentration of 0.5%, so this concentration was adopted as optimal. The ethane formation selectivity decreased rapidly with increasing NO concentration, nearly to zero. Diluting the mixture with helium, at least up to 60%, had a moderate effect on the process. Even the CH4/O2 ratio, a key parameter of the... 

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