Discussion on Energy Saving in CPE Washing
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Our factory produces CPE, and the washing process requires a large amount of water, takes a long time, resulting in the waste of a great deal of precious fresh water. Moreover, the long duration of this process severely hinders the proper progress of both the preceding and subsequent processes. We increased the length-to-diameter ratio of the device, and added CaCO3 later on; the effect was not very significant. I’m not sure what other good methods there are. Everyone is welcome to discuss this so that we can improve together
The aqueous-phase CPE process has inherent defects; it requires extensive washing with water, which not only consumes a large amount of clean water but also generates dilute acids that pollute the environment. If you want to save water, use the vapor phase method.
Can the residual hydrogen chloride in CPE slurry not be desorbed?
Reply to 3# solo1981: Are there any better ways to have it adsorbed inside the particles without the need for washing with water? Incomplete washing can affect plastic processing, leading to a decrease in thermal stability and yellowing of the products.
I think we can try using vacuum distillation to remove hydrogen chloride. The remaining residue that really can’t be removed cleanly can only be captured using ammonium carbonate. Moreover, ammonium carbonate can not only capture hydrogen chloride but also residual chlorine molecules. Of course, the amount of ammonium carbonate cannot be excessive; I have used ammonium carbonate to remove residual hydrogen chloride from CPVC, and using too much of it causes the resin to turn yellow directly. . . :funk::funk:
Is vacuum dialysis practiced in practice? Care must be taken to avoid using too much ammonium carbonate, as it can cause the product to turn yellow. When should ammonium carbonate be added?
Using a titanium alloy horizontal spiral centrifuge for deacidification cleaning allows the slurry to have a water content of less than 30% (the acid content can be calculated separately), after which it can be sent directly to the neutralization tank; this method saves about 60% in water usage and is currently the most cost-effective approach.