METHOD FOR HYDROGENIZING ACETONE IN ISOPROPYL ALCOHOL

摘要

FIELD: technological processes.;SUBSTANCE: present invention relates to a method for the hydrogenation of acetone to isopropyl alcohol, which is widely used as an octane additive to gasolines, anti-icing fluid, solvent in the production of surfactants, plasticizers, additives to oils, medicines. Hydrogenation is carried out with a hydrogenating gas, in which hydrogen-containing exhaust gas is used after pyrolysis of a hydrocarbon feedstock and separation of propylene and ethylene, characterized by the following composition and concentration limits of the components, %: hydrogen – 40–90, nitrogen – 7.7–23.5, methane – 27–45, carbon dioxide – up to 1, carbon monoxide – up to 1.5, admixture of olefins – up to 3, diene hydrocarbons – up to 2.5, oxygen – up to 0.5, in the presence of a hydrogenation catalyst on a neutral carrier, the use of copper in the amount of 10–30 wt.%, deposited on a carrier in the form of silica gel granules with a grain size of 2.8–7.0 mm, specific surface area of 290–330 m²/g – the rest, which is activated at a temperature of 150–180 °C, in a current of a mixture of hydrogen:nitrogen=1:1 by volume for 2–3 hours, then in a stream of hydrogen for 0.5 hours. Hydrogenation of acetone is carried out at a temperature of 100–195 °C, pressure 20–30 atm, molar ratio hydrogen:acetone=(2–5):1, and hydrogenating gas before mixing with acetone is subjected to precontact preparation at a temperature of 150–250 °C and a pressure of 20–30 atm in the zone of the reactor of precontact preparation filled with the same catalyst.;EFFECT: proposed method allows to obtain the target product with a high yield using hydrogen-containing gas with oxygen, olefinic and diene hydrocarbon impurities.;1 cl, 3 tbl, 27 ex