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Vinyl Chloride Monomer

MOGAS valves are ideal for the hazardous conditions of VCM production

valve for VCM production
This 12-inch ASME 300 Class C-Series valve has successfully isolated a VCM furnace at a major German chemical plant for 15 years before it required spare parts.

VCM is a colorless gas manufactured using a series of chemical reactions from ethylene dichloride (EDC). (Most EDC plants are integrated with VCM plants.) VCM is flammable at room temperature and will polymerize if exposed to air or other activating substances, so is an explosion hazard. It is a known human carcinogen in situations of overexposure, and can cause frostbite from rapidly evaporating liquid.

When moisture is present, VCM can corrode iron and steel. Equipment used for VCM storage or processing should be constructed of mild, carbon or stainless steel; not aluminum, copper or copper alloys.

VCM is the building block in the production of polymer polyvinyl chloride (PVC), accounting for almost the entire demand for VCM. PVC products include vinyl siding, magnetic strip cards, window frames, pipes, gloves, rain coats and shower curtains.

MOGAS valves perform well under the harsh conditions of VCM production. Typical valve sizes are up to 10 inch, ASME 300 Class. Though pressures are moderate (up to 450 psi), temperatures can reach up to 1000° F at the EDC furnace outlet, Features on MOGAS valves include:

  • materials of construction specifically designed to be resistant to impact and corrosion
  • metal seats with a sharp leading edge to wipe and clean the ball surface of the sticky polymerization reactions
  • seat springs that maintain constant contact between ball and seats for pressure-energized sealing
  • lapping process on ball and seat set that provides 100% sealing contact through the full transition between the open and closed position
  • a wide seat sealing surface that has more contact area, while allowing for thermal expansion of trim
  • a larger stem design for additional torque
  • a dual-guided stem design that prevents stem packing leaks and risk of fugitive emission
Vinyl Chloride Monomer Process Flow Diagram
  1. Fresh Ethylene
  2. Chlorine
  3. Direct Chlorination Reactor
  4. Direct Chlorination Reactor Recirculation
  5. Ethylene Dichloride (EDC)
  6. Hydrochloric Acid (HCL)
  7. Oxygen (O2) (Air)
  8. Oxy-chlorination Reactor Inlet
  9. Oxy-chlorination Reactor Outlet
  10. Oxy-chlorination Quencher
  11. Oxy-chlorination Quencher Recirculation
  12. Oxy-chlorination Quencher Cooler
  13. Caustic Soda Washing Column Ethylene
  14. Caustic Soda Washing Column Recirculation
  15. Caustic Soda Washing Column Ethylene Cooler
  16. Ethylene Recirculation Compressor
  17. Caustic Soda Washing Column
  18. Decanter
  19. Dehydrator
  20. Low Boiling Point Fractionator
  21. Pure Ethylene Dichloride (EDC)
  22. Recovery Drying Column
  23. High Boiling Point Fractionator
  24. Recycle Ethylene Dichloride (EDC)
  25. Ethylene Dichloride (EDC) Furnace Inlet
  26. Ethylene Dichloride (EDC) Furnace Outlet
  27. Ethylene Dichloride (EDC) Furnace Cooler
  28. Ethylene Dichloride (EDC) Quencher
  29. Ethylene Dichloride (EDC) Quencher Recirculation
  30. Ethylene Dichloride (EDC) Quencher Cooler
  31. Hydrochloric Acid (HCL) Removal Column
  32. Vinyl Chloride Monomer (VCM) Recovery Column
  33. Heat Exchanger
  • Heat Exchanger (not shown)
  • General Ball Valves (not shown)
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