Closed-loop data on the removal of VCM present in PVC as well as the acid from VCM washings by suspension method
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Whoever has information on a closed-loop system for removing VCM present in PVC, as well as the acid resulting from the washing of VCM, could please share it with me? Thank you in advance! Those with experience are also invited to offer their guidance. This post was last edited by edc1233 on 2008-9-16 at 16:41.]
It mainly concerns issues related to the closed-loop acid production process using VCM for washing, as well as the desorption of acid to produce hydrogen chloride. Topics include process diagrams, equipment selection, process control, and various potential problems that may arise. Thank you
To remove VCM present in PVC using the suspension method, a slurry stripping tower is sufficient; our company uses one of this type, and it works quite well. For the closed-loop system involving acid washing of VCM, there is a acid-water circulation tank from which water is pumped to make the flow go in the reverse direction, from the washing tower to the foam tower, with the circulation tank being used to replenish water
The main goal is to desorb HCl from the waste acid in order to increase the yield of resin.
Removing VCM from PVC resin slurry by suspension method can be achieved using a slurry stripping tower, with fairly good results； Currently, there are mainly two types of such towers: one is the cross-flow tray tower, and the other is the overflow tray tower. Regarding the acid removal by VCM washing, there are currently two available technologies: one is a conventional washing tower + foam tower, and the other is a combined tower.
Thank you, please explain it in more detail
Currently, there are mainly two types of such towers: one is the cross-flow tray tower, and the other is the overflow tray tower. The closed-loop system for washing VCM with acid involves using a pump to circulate the acid-water mixture in a circulation tank, in the reverse direction, from the washing tower to the foam tower; water is added to the circulation tank as needed
Isn’t there any kind of process diagram or anything?:' Please give it to me