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Vinyl Acetate from Ethylene and Acetic Acid over Palladium-Gold
Vinyl acetate, the monomer for PVA wood glue, is made by oxidising ethylene and acetic acid together with oxygen in the gas phase, over a palladium-gold shell catalyst in steam-heated tube reactors at 150–160 °C and 8–11 bar. About 92 % goes to vinyl acetate; the rest burns. A few ppm of hydroquinone keeps it from forming explosive peroxides in air.
The picture: our diagram of reactor, condenser and column.
Abantado
Continuous
Mga Tagubilin
1
1
Oxidise over palladium-gold
Oxidise over palladium-gold
Feed ethylene, acetic acid vapour and oxygen through steam-heated tubes packed with palladium-gold catalyst at 150–160 °C and 8–11 bar.
Mga materyales para sa hakbang na ito:
Ethylene350 kg
Acetic acid (glacial)750 kg
Oksiheno200 kgMga kailangang kasangkapan:
Fixed-bed na tubular reactor
Palladium-gold catalyst
Kompresor ng gas2
2
Condense the product
Condense the product
Cool the reactor gas to condense vinyl acetate, water and unreacted acetic acid (our method). Send the unreacted ethylene back to the reactor.
Mga kailangang kasangkapan:
Ikid ng kondensadorKompresor ng gas3
3
Distil
Distil
Distil the vinyl acetate (boils at 72.7 °C) off the water and acetic acid (our method), and return the acid to the feed.
Mga kailangang kasangkapan:
Distillation column assembly4
4
Stabilise for storage
Stabilise for storage
Stir in 3–20 ppm hydroquinone; without it vinyl acetate forms explosive peroxides in air. Keep it away from flames: its vapour ignites easily.
Mga materyales para sa hakbang na ito:
Hydroquinone10 gMga kailangang kasangkapan:
Digital na Timbangang Pangkusina5
5
Feed per tonne
Feed per tonne
Naglo-load ng Jupyter notebook…
Mga Materyales
4- 350 kgPlaceholder
- 750 kgPlaceholder
- 200 kgPlaceholder
- 10 gPlaceholder
Mga Kinakailangang Kasangkapan
6- Placeholder
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- Placeholder
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