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Embodiment 1
[0018] Preparation of metal tungsten catalyst: impregnate the ammonium metatungstate solution (mass concentration: 0.4g / ml) on the activated carbon carrier, dry it in an oven at 120°C for 12 hours, and place it under H 2 Reduction was carried out at 700°C for 1 h in the atmosphere to obtain W / AC with a tungsten loading of 20 wt%.
Embodiment 2
[0020] Preparation of metal nickel-tungsten catalyst: The tungsten catalyst prepared as described in Example 1 is further impregnated with nickel nitrate solution, dried at 120°C, and reduced at 400°C for 2 hours to obtain Ni-W / AC (5wt%Ni-18wt%W) catalyst.
Embodiment 3
[0022] Metal catalyst Ni / AC, Ni / SiO 2 , the preparation of Pt / AC, Ru / AC: impregnate the activated carbon support with nickel nitrate, chloroplatinic acid, and ruthenium trichloride aqueous solution respectively, and after drying at 120°C for 12h, reduce it in a hydrogen atmosphere at 450°C for 1h to obtain the catalyst Ni / AC (5wt% Ni), Pt / AC (0.5wt% Pt), Ru / AC (5wt% Ru). Replace the activated carbon support with SiO 2 , the same method can be used to prepare Ni / SiO 2 (15 wt% Ni) catalyst.
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Abstract
The invention provides a method for preparing ethanediol from polyhydroxy compounds comprising starch, hemicellulose, cane sugar, glucose, fructose and fructosan. The method comprises the following steps of: taking the polyhydroxy compounds as reaction raw materials, and taking metals, carbides, nitrides, and phosphides of transition metals in families VIII, IX and X, such as ferrum, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum, molybdenum and tungsten as catalytic active components to form a polymetallic catalyst; and performing further catalytic conversion under a hydrothermal condition that the temperature is 120 to 300 DEG C and the hydrogen pressure is 1 to 13 MPa to prepare the ethanediol from the polyhydroxy compounds with high efficiency, high selectivity and high yield. The method for preparing the ethanediol from the polyhydroxy compounds has the outstanding advantages of renewable raw materials, environment-friendly reaction process, and atom economical efficiency. Simultaneously, compared with other techniques taking biomasses as the raw materials, the method has the advantages of simple process and high yield.
Description
technical field [0001] The invention relates to a preparation method of ethylene glycol, in particular to a reaction process in which polyhydroxy compounds undergo one-step catalytic hydrogenation degradation to prepare ethylene glycol under hydrothermal conditions. Background technique [0002] Ethylene glycol is an important energy liquid fuel, and is also a very important raw material for polyester synthesis, for example, for polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and can also be used As antifreeze, lubricant, plasticizer, surfactant, etc., it is a widely used organic chemical raw material. [0003] At present, the industrial production of ethylene glycol mainly adopts the route of petroleum raw materials, that is, ethylene oxide is obtained after epoxidation of ethylene, and then ethylene glycol is obtained by hydration [Document 1: Cui Xiaoming, Overview of Ethylene Glycol Production and Development at Home and Abroad, Chemistry Industry, 200...
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