From Nitroalkane Preparation FAQ
by Rhodium
Preparation of Sodium Ethyl Sulfate
"Two moles of absolute ethanol (92 grams) is slowly dripped into a beaker containing one mole of 20% Oleum (H2SO4 containing 20% SO3), adjusting the rate so that the temperature is maintained at 45°C. When all the ethanol is added, the solution is neutralized with anhydrous sodium carbonate (Na2CO3), care being taken for the evolution of carbon dioxide. Yield 85% of theory."
"Nitroethan from Sodium Ethyl Sulfate [4]
1.5 mole sodium nitrite (103.5g) is intimately mixed with 1 mole of sodium ethyl sulfate (158g) and 0.0625 moles of K2CO3 (8.6g). The mixture is then heated to 125-130°C, at which temperature the nitroethane distills over as soon as it is formed. The heating is discontinued when the distillation flow slackens considerably, and the crude nitroethane is washed with an equal amount of water, dried over CaCl2, and if needed, decolorized with a little activated carbon. The nitromethane is then re-distilled, collecting the fraction between 114-116°C. Yield 46% of theory."
Full text:
https://www.thevespiary.org/rhodium/Rhodium/chemistry/nitroalkane.html
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Is there any way to make Oleum from normal H2SO4?
/thank you for your help..