Vinyl chloride liquid temperature range

Vinyl Chloride Monomer (VCM). Vinyl chloride monomer (VCM), bp -13.4°C, is a gas at room temperature and pressure. Therefore, it is handled as a compressed volatile liquid in all polymerization operations. Its vapor pressure over the typical polymerization temperature range of 50-70°C is 800-1250 kPa. As a result, PVC polymerization reactors are thick-walled jacketed steel vessels with a pressure rating of 1725 kPa. VCM is slightly soluble in water (0.11 wt% at 20°C). This has some influence on the suspension polymerization process and is critically important to the success of the emulsion polymerization process. The... 

The direct chlorination of ethylene usually is run in the liquid phase and is catalyzed with ferric chloride. High-purity ethylene normally is used to avoid product purification problems. The cracking (pyrolysis) of EDC to vinyl chloride typically is carried out at temperatures of 430 to 530°C over a catalyst. The hot gases are quenched and distilled to remove HCl and then VCM. The unconverted EDC is returned to the EDC purification train. The oxychlorination step is the heart of the process and has two major variables, the type of reactor and the oxidant. The reactor may be either a fixed bed or a fluidized bed, and the oxidant is either air or oxygen. The temperature is in the range of 225 to 275" C with a copper chloride-impregnated catalyst. 

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