Catalyst for preparing alcohol through hydrogenation of acetic acid and preparation method

Abstract

The invention discloses a catalyst for preparing alcohol through hydrogenation of acetic acid, and a preparation method of the catalyst. The catalyst is a multicomponent load catalyst and comprises ingredients a, b and c, and a carrier, wherein the ingredient a is one or more of calcium, potassium, sodium, barium, strontium, calcium oxide, potassium oxide, sodium oxide, barium oxide and strontium oxide; the ingredient b is one or more of tin, cobalt, molybdenum, nickel, iron, tin oxide, cobalt oxide, molybdenum oxide, nickel oxide and iron oxide; the ingredient c is one of platinum, palladium, ruthenium, rhodium, platinum oxide, palladium oxide, ruthenium oxide and rhodium oxide; the carrier is silicon dioxide, cerium dioxide, titanium dioxide, graphite, aluminum oxide or active carbon; and the mass ratio of the ingredient a to the ingredient b to the ingredient c to the carrier is (1-20):(0.5-2):(0.5-1):100. The multicomponent load catalyst is prepared by a multistep impregnation method, and used for preparing alcohol through the hydrogenation of acetic acid, and results prove that the catalyst is excellent in catalytical performance, long in service life and high in reaction stability.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a catalyst and a preparation method for hydrogenating acetic acid to produce ethanol. Background technique [0002] Ethanol is one of the important chemical raw materials, it is widely used in medicine, food, chemical industry, military industry and other fields. In recent years, as a vehicle fuel, the demand for ethanol has been increasing. The United States has sold ethanol gasoline for more than 20 years, and 40% of light vehicles in Brazil use ethanol fuel. The current demand for industrial ethanol in China is about 3 million tons per year, and the annual growth rate is expected to be between 8% and 10%. The demand for fuel ethanol for vehicles is also growing. It is estimated that the number of automobiles in my country will reach 160 million to 180 million in 2015. If all ethanol gasoline is used, the demand for fuel ethanol will reach 10 million tons. The total ethanol production i...

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Problems solved by technology

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 high and the equipment requirements are high

[0006] Chinese patent CN102847535A discloses that in the presence of surfactant sodium lauryl sulfate, the PtSn / carbon nanotube catalyst is prepared by liquid phase reduction, at 350°C, 2.0MPa, 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%, and the selectivity of ethanol is 91.1%, but the reaction temperature is high, the hydrogen-acid ratio is large, and there are up to 5% gas phase by-products in the reaction product

Chinese patent CN102333588A discloses in Pt-Sn / SiO 2 CaSiO was added to the catalyst system 3 , at 250℃, 22bar, GHSV2500h -1 Under these conditions, the selectivity of ethanol can reach 92%, but the conversion rate of acetic acid is only 24%.

Although PtSn / SiO 2 The catalytic performance is the best, but its lifespan is only 100h, which inevitably limits the possibility of its industrial application

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