What methods are used for the deep dehydration of ethylene glycol produced industrially?
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I would like to ask the experts and seasoned professionals: what methods are used for the deep dehydration of ethylene glycol produced on an industrial scale? For things like activated alumina, is solid adsorption using molecular sieves feasible? Are there any applications for it? During adsorption, what happens to the regeneration of the solid adsorbent? Some studies suggest that alcohols and oil droplets can degrade the properties of molecular sieves. Are there actually specialized molecular sieves for the dehydration of alcohols or oils? Thank you all! Please help answer this; I would be extremely grateful! ! !
Refined ethylene glycol requires not only dehydration but also the removal of methanol and ethanol, with all of these substances to be reduced to levels below 50 mg/L. It’s quite difficult. I am trying to use a combination of several special membrane separation processes to do this, but the challenges are indeed great. Without half a year and a million or so yuan, nothing can be achieved.
Making steamed buns is very expensive. The local steamed buns aren’t good, right? It seems the most efficient option is to just use steamed buns! ! !
It’s not a question of whether membranes work in domestic settings; it’s a question of whether such membrane separation processes have existed in space in the past.
Deep dehydration is very difficult; during the dehydration process, ethylene glycol may also be synthesized.
Just how difficult is the dehydration of ethylene glycol? Take a look at the following figures: At 0 degrees Celsius, when the relative humidity is 100% – for example, on a morning in a northern region where frost has just formed and the temperature is exactly 0 degrees Celsius – the saturated vapor pressure of water vapor in the air is 610 Pa； During summer (the period of high temperatures), after a rainstorm, the temperature is 30 degrees and the relative humidity is 100%, creating a sauna-like condition; the saturated vapor pressure of water vapor in the air is 4200 Pa ； Do you know what the vapor pressure corresponding to ethylene glycol containing 50mg/L of water is? Let me tell you, at 40 degrees, the vapor pressure of water is 1 Pa. For dehydration, one needs to identify the driving force – where is that driving force?
Use a steam jet pump to create negative pressure and heat the bottom of the tower in order to vaporize these light components!