UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
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.
Hejuru
Continuous
Amabwiriza
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.
Ibikoresho by'iyi ntambwe:
Etilene350 kg
Asidi asetike (isukuye cyane)750 kg
Ogisijene200 kgIbikoresho bikenewe:
Reyakitori y'imiyoboro ifite igitanda gihamye
Igitera-vuba cya paladiyumu na zahabu
Igikandamiza gazi2
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.
Ibikoresho bikenewe:
Umuzingo w'ikondanseriIgikandamiza gazi3
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.
Ibikoresho bikenewe:
Iteraniro ry'inkingi yo gupika4
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.
Ibikoresho by'iyi ntambwe:
Hidorokinoni10 gIbikoresho bikenewe:
Iminzani ya Digitale yo mu Gikoni5
5
Feed per tonne
Feed per tonne
Gupakira ikaye ya Jupyter…
Ibikoresho
4- 350 kgUmwanya
- Umwanya
- 200 kgUmwanya
- 10 gUmwanya
Ibikoresho bikenewe
6- Umwanya
- Umwanya
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