Method for preparing ethanol by acetic acid gas phase hydrogenation
A technology for hydrogen production and acetic acid, which is applied in the field of ethanol production by gas-phase hydrogenation of acetic acid, which can solve the problems of low ethanol product selectivity, high reaction pressure and energy consumption, and achieve the effect of reducing reaction pressure and energy consumption and improving selectivity
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Embodiment 1
[0019] The catalyst used is Pd-Re-Au / activated carbon. The weight composition of the catalyst is: Pd=1.5%, Re=5%, Au=2%, and the rest is carrier activated carbon. The carrier is commercial coconut shell carbon, and the catalyst active component Pd and additives Re and Au are loaded on the carrier activated carbon (the particle size of the activated carbon is 20-40 mesh) by conventional impregnation method. 6.8 grams (about 10ml) of the catalyst were activated by hydrogen before the reaction, the activation conditions were: GHSV=1000h -1 , Atmospheric pressure, 300°C, reduction time 5 hours. Choose a fixed bed reactor. The reaction temperature is 240°C, the hydrogen pressure is 8.0MPa, and the H 2 / acetic acid (refined acetic acid) molar ratio is 20 acetic acid liquid space velocity is 0.5h -1 , the reaction time is 50h, sampling analysis. The gas phase effluent was analyzed by gas chromatography, Porapark Q packed column, TCD detector; the liquid product sample was analyz...
Embodiment 2
[0021] The liquid space velocity of acetic acid is 0.3h -1 , other conditions are identical with embodiment 1.
Embodiment 3
[0023] The liquid space velocity of acetic acid is 0.9h -1 , other conditions are identical with embodiment 1.
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