Ukusebenzisana
UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
Yingozi
Butadiene: Ethanol over Copper, then over Tantalum-Promoted Silica Gel
Butadiene is the 'B' in ABS. Toussaint and Dunn of Carbide and Carbon (US 2,421,361, 1947) made it straight from ethanol in two converters: a copper catalyst first turns part of the alcohol into acetaldehyde and hydrogen, then silica gel with a little tantalum oxide joins alcohol and aldehyde into butadiene. Their 20-hour run made 296 g of butadiene from 2,206 g of ethanol. The off-gas is nearly all hydrogen: no flames, good ventilation.
The picture: our diagram.
Osezingeni eliphezulu
About 20 hours (continuous)
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