Dehydration and desalination of crude polyether polyols
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I have been working on the purification of crude polyether polyols recently. The product obtained after polymerization needs to be treated with acid to neutralize the KOH, thereby producing water and salt. The conventional method involves vacuum evaporation to remove water, after which the salt precipitates out, thus achieving dehydration and desalination. However, this process takes a very long time. After researching some literature, I found that some people use coagulators for this purpose of desalination and dehydration. I also contacted several companies in China that manufacture coagulators, but they said they are unable to produce such devices. Does anyone know of any companies that can do this? Thank you very much! ! ! ! !
Evaporation crystallization can be used for this purpose; many companies in China carry out this process, and then centrifugal separation is applied. The crystal slurry obtained after separation can be processed according to the requirements of subsequent processing stages
The problem now is that the vacuum evaporation process takes too long, and the salt present may affect the performance of the product
The coalescer is working properly; it can now remove free water to 15 ppm with no energy consumption, and its operation is simple and stable.
Hey, have you resolved the dehydration issue?
The coalescer won’t work, right? I asked the coalescer supplier; the water in this hydrophilic product cannot be removed
Are there any examples that can be used as a reference for learning? There is no solution yet
The problem hasn’t been solved yet. I’ve contacted many manufacturers of coagulators, and all of them said they couldn’t meet the requirements. However, after checking foreign patents, it turns out that Bayer and BASF do have methods based on coagulation to remove water and salts from polyether polyols. But I’m not sure which company abroad is capable of producing such coagulators; it’s likely that this is considered their core technology
Let me take a look at this device; the inclined plate settlement should also enhance mass transfer, as it’s essentially the same principle as coalescence, only with coalescence resulting in stronger mass transfer
Why do you say the evaporation time is too long? Is it intermittent evaporation at the site?