Guidance: Filtration in PVC plastic manufacturing is mainly VCM (vinyl chloride) monomer feed filtration, unreacted monomer recycle filtration, and vinyl acetate monomer filtration. VCM (vinyl chloride) monomer feed filtration Tongue And Groove Face Flanges
The Tongue and Groove faces of this flanges must be matched. One flange face has a raised ring (Tongue) machined onto the flange face while the mating flange has a matching depression (Groove) machined into it's face.
Tongue-and-groove facings are standardized in both large and small types. They differ from male-and-female in that the inside diameters of the tongue-and-groove do not extend into the flange base, thus retaining the gasket on its inner and outer diameter. These are commonly found on pump covers and Valve Bonnets.
Tongue-and-groove joints also have an advantage in that they are self-aligning and act as a reservoir for the adhesive. The scarf joint keeps the axis of loading in line with the joint and does not require a major machining operation.
General flange faces such as the RTJ, TandG and the FandM shall never be bolted together. The reason for this is that the contact surfaces do not match and there is no gasket that has one type on one side and another type on the other side.
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It is important that VCM monomer raw materials do not contain visible colloids and impurities; these impurities can cause fish eye effects or insulation failures, while high-end, high-price applications do not allow the use of unqualified PVC. The filtering effect of VCM directly affects the quality of PVC.
Unreacted monomer circulation filtration
The monomers that are not involved in the reaction (mainly vinyl chloride) will be recovered by the condenser. The recycling process will generate foam on the upper part of the reactor. The foam carrying PVC particles will block the condenser and cause production failure. The filter is used to protect the condenser.
Vinyl acetate monomer filtration
Vinyl acetate monomers are sometimes used to reduce crystallization while allowing the final product to react at a lower temperature. VAc is normally used in a ratio of 9 to 15% by weight. When VAc is pumped into the reactor, it is also required for quality assurance. Add filter, usually 5 micron absolute precision filter
Filtration system benefits
1. Ensure continuous production of high quality PVC;
2. Increase income;
3. The maximum guaranteed production capacity;
4. Minimum downtime.