Methanol content in the products of the silver-based formaldehyde production process
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For the silver-based formaldehyde production process, can the operating unit that achieves the lowest level of methanol content in the product reach below 1%, assuming that the purity of formaldehyde is 45%? What is the corresponding figure for the iron-molybdenum method?
Damn, I’m short of money to spend – I’ll take a job as a couch surfer to earn some cash! ;P;P
The iron-molybdenum method generally uses an alcohol content of 0.7%-1.2%, along with a 55% formaldehyde solution.
Silver-based formaldehyde can achieve an alcohol content of 1% (45% formaldehyde), and the methanol recycling method can meet these requirements; this is therefore recommended in the industry guidelines for the 12th Five-Year Plan for the formaldehyde industry.
I would like to ask how to determine the distillation conditions for purifying methanol using a 45% formaldehyde solution Should it be a vacuum or under pressure?
In the Topso process, the methanol content is generally below 0.8 wt-%, while the formaldehyde content can reach 558 wt-%； The DBW process is designed with 0.38 wt-% methanol and 55.58 wt-% formaldehyde.
The 45% formaldehyde produced by the silver process is dealcoholized using a vacuum dealcoholization tower; why does the heat exchanger at the top of this tower tend to get clogged? The temperature is maintained at the designed level.