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Acetic Acid

MOGAS Hastelloy® valves with PEEK seats combat high corrosion and high-pressure steam in acetic acid applications.

acid valve for service
This 4-inch ASME 600 Class CA-1AS valve was repaired after 5 years in service. The ball was in good condition and only needed kiss lapping, while the seats were replaced.

Acetic acid, also known as ethanoic acid, or glacial acetic acid when undiluted, is a colorless liquid organic compound with a distinctive sour taste and pungent smell. Although it is classified as a weak acid, when concentrated it is corrosive and can attack the skin.

It is used in the production of vinyl acetate monomer, commonly known as wood glue, white glue, carpenter’s glue, school glue, Elmer’s glue in the US, or PVA glue. A diluted solution of about 5% by volume of acetic acid produced by fermentation and oxidation of natural carbohydrates produces vinegar.

Converting acetic acid to a product involves the carbonylation of methanol using a rhodium metal iodide complex ion as catalyst, which is an expensive catalyst.
For over 30 years, MOGAS has supplied 1-inch through 4-inch ASME 600 Class Hastelloy C-Series valves with PEEK seats in this application. The larger 4-inch valves are used in the most critical service to isolate the reactors. Due to our performance in this service, MOGAS has replaced many of the competitors valves and is the preferred valve choice at a major global specialty chemical company.

  Typical Operating Conditions:
  • Moderate temperature
  • 25 – 450° F (-4 – 232° C)
  • Moderate pressure
  • 25 – 950 psig (1.7 – 65.5 bar g)
  • Very corrosive compounds
  • High-pressure steam

Acetic Acid Process Flow Diagram
  1. Fresh Methanol Feed 
  2. Split Methanol Feed 
  3. Low Pressure Absorber Methanol 
  4. Methanol Reactor Feed 
  5. Fresh Carbon Monoxide Feed 
  6. Fresh Make-up Catalyst Feed 
  7. Recycle Catalyst 
  8. Acetic Acid Reactor 
  9. Acetic Acid Flash Vaporizer 
  10. Acetic Acid Dehydration Column 
  11. Acetic Acid Finishing Column 
  12. Reactor Overhead 
  13. High Pressure Absorber Overhead 
  14. Low Pressure Overhead 
  15. Flash Vaporizer Recycle Catalyst 
  16. Dehydration Column Recycle Catalyst Heavies 
  17. Dehydration Column Recycle Catalyst Lights 
  18. Finishing Column Overhead 
  19. Finishing Column Heavies 
  • Heat Exchanger (not shown)
  • General Ball Valves (not shown)
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