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LIFE III / PVClean
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| Water Recycling from Suspension-PVC Polymerization Process The polymerization in the Suspension PVC process, which is the most important for the production of PVC, is done batchwise in the liquid phase. Raw- and auxiliary materials are vinylchloride (VCM), demineralized water, initiators, dispersing agents and other additives. Non converted VCM is recycled. The degassed suspension is mechanical drained in a decantation centrifuge. The residual water is evaporated in a drying step. The dried PVC is stored for bagging and shipment. |
| Requirement and Approach Conventionally the decantation waste water contains 50 to 500 mg/l PVC and is treated in a biological waste water treatment unit. Reuse of the waste water is not possible due to quality problems caused by the residual PVC content. Thus a purification step is required to separate all fine particles from the waste water. Project The accompanying flow diagram shows the implementation of a filtration unit into the Suspension-PVC process. The waste water from the decantation centrifuge is treated in the filtration unit. The treated water is free of PVC solids and is recycled into the polymerization process. The PVC suspension with the concentrated solids is introduced into the drying process. This project is friendly supported by the EU environment program LifeIII. Targets Reduction of fresh water consumption Reduction of waste water Minimization of PVC solid content in waste water Recycling of PVC as saleable product |
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