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Butyraldehyde: Butyl Alcohol Dehydrogenated over Copper Pellets at 400-680 °F (Hasche, Eastman, US 2,173,111)
Hot copper pulls two hydrogen atoms off butyl alcohol and leaves butyraldehyde. Hasche's catalyst is copper made from blown, water-quenched cuprous oxide, in dust-free pellets that can be burnt clean and reduced again when they tire.
Result: butyraldehyde, distilled off from the unchanged alcohol.
Source: Hasche, US 2,173,111 (Eastman Kodak, 1939), claims 6, 9 and 12. His worked run is for propyl alcohol; conversion for butanol is not given. Picture drawn by Youblob.
Hejuru
1 day
Amabwiriza
1
1
Pack the copper catalyst
Pack the copper catalyst
Fill a tube with dust-free copper pellets made from cuprous oxide blown from molten copper and quenched in water (2-5 mesh in claim 17).
Ibikoresho bikenewe:
Udupira tw'umusemburo w'umuringa
Itanura ry'umuyoboro2
2
Preheat the butyl alcohol
Preheat the butyl alcohol
Vaporise and preheat the butyl alcohol to about 500-600 °F.
Ibikoresho by'iyi ntambwe:
n-Butanol1 as requiredIbikoresho bikenewe:
Itanura ry'umuyoboro3
3
Pass it over the copper at 400-680 °F
Pass it over the copper at 400-680 °F
Lead the hot vapour over the catalyst held at about 400-680 °F. It splits into butyraldehyde and hydrogen; part of the alcohol passes unchanged.
Ibikoresho bikenewe:
Udupira tw'umusemburo w'umuringaItanura ry'umuyoboro
Umuzingo w'ikondanseri4
4
Distil off the aldehyde
Distil off the aldehyde
Condense the products and distil: butyraldehyde comes over first (it boils near 74 °C); distil the alcohol back in the presence of alkali and return it.
Ibikoresho bikenewe:
Ikinyuza umwuka gitandukanya
Hidorogiside ya sodiyumu, umuti wa 10 %5
5
Reactivate the spent copper
Reactivate the spent copper
When the catalyst slows, flush it, oxidise it at about 600-800 °F, cool, and reduce it again with alcohol vapour at about 300-400 °F.
Ibikoresho bikenewe:
Udupira tw'umusemburo w'umuringaItanura ry'umuyoboroIbikoresho bikenewe
5- Umwanya
- Umwanya
- Umwanya
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