Catalyst for producing ethyl alcohol and co-producing ethyl acetate through acetic acid hydrogenation and preparation method

Abstract

The invention relates to a catalyst for producing ethyl alcohol and co-producing ethyl acetate through acetic acid hydrogenation and a preparation method and mainly solves the problems that in the prior art, the acetic acid conversion rate is low, and selectivity of ethyl alcohol and ethyl acetate is not easy to modulate. The catalyst for producing ethyl alcohol and co-producing ethyl acetate through acetic acid hydrogenation comprises a component a, a component b, a component c and a carrier; the component a is selected from one or more of iron, nickel, cobalt, copper, rhenium, stannum, indium, germanium, lead or oxide of lead; the component b is selected from one or more of iridium, platinum, platinum, ruthenium, rhodium or oxide of rhodium; the component c is selected from one or more of phosphorus, niobium, tungsten, calcium, potassium, sodium, barium, strontium or oxide of strontium. By means of the technical scheme of the catalyst and the preparation method thereof, the mentioned problems are well solved, and the catalyst and the preparation method thereof can be used for producing ethyl alcohol and co-producing ethyl acetate through acetic acid hydrogenation.

Description

technical field [0001] The invention relates to a catalyst for hydrogenation of acetic acid to produce ethanol and co-production of ethyl acetate and a preparation method thereof. Background technique [0002] In recent years, with the gradual depletion of petrochemical energy and the need for environmental protection, countries all over the world are developing new alternative energy sources, such as solar energy, wind energy, and biomass energy. Fuel ethanol, as an emerging renewable green energy, is developing rapidly. As a high-quality liquid fuel, its fraction and ash content are low, its combustion performance is similar to that of gasoline, it has higher oxygen content and octane number, and it burns more completely than ordinary gasoline. , Low carbon monoxide emissions, known as "green energy" in the 21st century, the United States has sold ethanol gasoline for more than 20 years, and 40% of light vehicles in Brazil use fuel ethanol. In recent years, the United Sta...

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Problems solved by technology

[0005] At present, the acetic acid hydrogenation catalysts reported at home and abroad are mainly supported noble metal catalysts such as Pt, Pd, Ru, etc., the reaction conditions are relatively harsh, and there are still problems such as low catalyst activity, especially poor ethanol selectivity.

US2607807A discloses acetic acid on Ru catalyst at 7.00×10 7 ~9.50×10 7 Hydrogenation under Pa pressure to obtain 88% ethanol yield, 2.00×10 7 The yield is 40% under the pressure of Pa, but this extreme condition is difficult to accept for an industrial device, and the economy is also relatively poor

Chinese patent CN102229520A discloses a W-Re-Ru / almond core carbon catalyst at 10MPa, 250°C, and a space velocity of 1.0h -1 Under certain conditions, the conversion rate of acetic acid is greater than 99%, and the selectivity of ethanol is 98.1%, but the reaction pressure is relatively high, and the requirements for equipment are high

Chinese patent CN102847535A discloses that in the presence of the surfactant sodium lauryl sulfate, the Pt-Sn / carbon nanotube catalyst is prepared by liquid phase reduction, at 350°C, 2.0MPa, and liquid hourly space velocity 0.6h -1 , under the condition of hydrogen-acid ratio of 80, the conversion rate of acetic acid is 99.9%, the selectivity of ethanol is 91.1%, and the selectivity of ethyl acetate is 1.5%, but the reaction temperature is high, the ratio of hydrogen-acid is large, and there are still Has up to 5% gas phase by-products

SiO prepared by co-impregnation method reported by Chinese patent CN102333588A 2 -CaSiO 3 -The selectivity of ethanol in the hydrogenation of acetic acid with Pt-Sn catalyst to ethanol reaches 92%, but the conversion rate of acetic acid is only 24%

CN104001526A takes Pt as the active component, and the selectivity of the catalyst ethanol after adding four kinds of auxiliary agents is 82.4%, the selectivity of ethyl acetate is 9.9%, but the conversion rate of acetic acid is only 72.5%

[0006] Existing catalyst reports are mainly to improve the conversion rate of acetic acid or the selectivity of ethanol, although in CN102378647, the modification of catalyst support can improve the selectivity of product, but the maximum conversion rate of acetic acid in this method is only 73%

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