DMF membrane dehydration
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DMF dehydration yields a mass percentage of 40%, which is then concentrated to 99.5%. It contains only water with no other impurities. Can a membrane be used? With that kind of membrane, it’s possible to do it. Thank you all for your help!
If a membrane is used, I’m afraid DMF will cause too much damage to it
Try using a PTFE membrane; PTFE should work fine
Thank you for the support from the third floor. Could you be more specific about how DMF damages membranes, especially inorganic ceramic membranes? Thank you very much!
Ceramic membranes simply cannot retain DMF; DMF is known as a universal solvent, and ordinary organic membrane materials cannot handle it at all. It’s better to consider using a distillation tower instead.
Osmotic vaporization can be used, but with such a high level of moisture, it is not recommended to feed it directly into the osmotic vaporization device. It’s better to first use distillation to remove some of the water; once the moisture content is around 10%, then osmotic vaporization can be applied effectively! As for the membrane selection, inorganic pervaporation membranes can be used; there are engineering examples showing that high-purity DMF solvent can be obtained.
This post was last edited by plscalme on 2012-12-28 09:34. For a single inorganic ceramic membrane, strong acids and strong bases are generally those that can easily cause damage to the membrane; another important factor is the absence of chloride ions. Specifically, one can look at the structural components of the membrane; the backbone structure of inorganic ceramic membranes is AlO and SiO. When considering such chemical components, it’s possible to determine what reactions they might undergo, which could cause damage to the membrane. Note: Regarding the use of membranes for the dehydration of organic solvents, it is generally possible to coat the surface of inorganic ceramic membranes with a layer of selective molecular sieve membrane; the advantages of doing so are obvious. First, it has the strong water-absorbing capacity of molecular sieves; second, it is reusable (the molecular sieves do not need to be regenerated); third, it possesses some of the excellent permeation and diffusion properties of ceramic membranes. I won’t say much about the rest. Perhaps some people will ask why the molecular sieve mentioned here does not need to be regenerated after becoming saturated with water Hehe, actually this is just a method, an operational technique for achieving continuous production. Since this involves some trade secrets, I’m unable to provide a detailed explanation; I’m sorry!