Hoffmann-LaRoche
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Registered: 10-9-2002
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methanol from CO2
I recently tried this process, which describes the conversion of CO2 into methanol, utilizing an electric cell...
I did not have success, i think the current density was too high.
The patent text itself doesnt lose a single word about the preferred current density....
United States Patent 3,959,094
Steinberg May 25, 1976
EXAMPLE
A 33% aqueous KOH solution containing 3.2% CO.sub.2 is circulated through absorber 12 countercurrent to air until the KOH solution is 50% converted to
K.sub.2 CO.sub.3 and containing 6.5% CO.sub.2. The potassium hydroxide-carbonate solution is electrolyzed with at least 1.4 volts D.C. current until
50% of the dissolved CO.sub.2 is converted to CH.sub.3 OH. The concentration of methanol is 2.3% by weight. All the methanol is essentially distilled
from solution and recovered.
The energy requirements for the above are as follows:
Energy for CO.sub.2 absorption from air and
distillation of methanol
0.8
Energy for electrolytic reduction
3.6
4.4 Kwh
per lb. of CH.sub.3 OH
This is equivalent to 29.0 Kwh(e)/gal-
lon CH.sub.3 OH
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The_Decomposer
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reaction of acetonitrile
CH3CN + NaOCl + 2 H2O --> CH3OH + CO2 + NH3 + NaCl
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BASF
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Thanks for your input, but i think i`d better keep my acetonitrile for other purposes;-)
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