Method for preparing ethylene glycol and 1,2-propylene glycol by using saccharide solution
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A technology of sugar solution and ethylene glycol, which is applied to the production of ethylene glycol from sugar solution, 1, which can solve the problems of cumbersome reaction process and achieve the effects of improving economy, high yield and reducing energy consumption of distillation
Active Publication Date: 2012-09-19
中科柏易金(郑州)新能源科技有限责任公司
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Embodiment 1
[0019] Preparation of the metal catalyst Ru / AC: impregnate the activated carbon support with ruthenium trichloride aqueous solution, dry at 120°C for 12h, and then reduce it in a hydrogen atmosphere at 500°C for 1h to obtain the catalyst Ru / AC (2wt%Ru).
Embodiment 2
[0021] Preparation of metal catalyst W / AC: impregnate activated carbon support with ammonium metatungstate aqueous solution, dry at 120°C for 12h, and then reduce in hydrogen atmosphere at 700°C for 1h to obtain catalyst W / AC (30wt%W).
Embodiment 3
[0023] Ni-W 2 C / AC catalyst preparation: References Angew.Chem.Int.Ed.2008, 47,8510-8513, ammonium metatungstate and nickel nitrate are made into a mixed solution according to the ratio of tungsten / nickel weight ratio of 15:1, wherein , the mass volume concentration of ammonium metatungstate is 0.4g / ml. Then, the mixed solution was impregnated with activated carbon support (AC). After oven drying at 120 °C for 12 h, the catalyst precursor was placed in H 2 The temperature-programmed carbothermal reaction was carried out in the atmosphere. The specific reaction process was as follows: 2.0 g of the precursor was heated from room temperature to 400 °C in a quartz reaction tube for 1 h, then raised to 700 °C at 1 °C / min and kept for 1 h for carbonization. The hydrogen flow rate was 100ml / min. Obtained Ni-W with tungsten loading of 30wt% and nickel loading of 2wt% 2 C / AC catalyst, expressed as Ni-W 2 C / AC (2wt%Ni-30wt%W 2 C).
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Abstract
The invention provides a method for preparing ethylene glycol and 1,2-propylene glycol by using a high-concentration saccharide solution. Reaction raw materials comprise cane sugar, glucose, fructose, fructosan, xylose, soluble lower polyxylose and soluble starch. According to the method, high-concentration saccharide is used as a reaction raw material, and a high-pressure pump feeding mode is used in a reaction process which is performed in a high-pressure reaction kettle; iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium and platinum which serve as transition metal in eighth, ninth and tenth groups are used as hydrogenation active ingredients; the hydrogenation active ingredients form a composite catalyst together with metal tungsten, tungsten carbide, tungsten nitride, tungsten phosphide, tungsten oxide, tungsten sulfide, tungsten chloride, tungsten hydroxide, tungsten bronze, tungstic acid, tungstate, metatungstic acid, metatungstate, paratungstic acid, paratungstate, peroxotungstic acid, peroxotungstate and tungsten-containing heteropolyacid which serve as catalytic active ingredients; and the high-concentration saccharide solution can be efficiently prepared into the ethylene glycol and the propylene glycol at high selectivity and high yield in a one-step catalytic conversion process under the hydrothermal condition that the temperature is 120 to 300 DEG C and the hydrogen pressure is 1 to 13MPa. By the method, the problem of coking of the high-concentration saccharide in the catalytic conversion process can be effectively solved, and high-concentration ethylene glycol and propylene glycol can be prepared by the high-concentration saccharide.
Description
technical field [0001] The invention relates to a method for preparing ethylene glycol and 1,2-propanediol from a sugar solution, specifically a reaction process for preparing ethylene glycol and 1,2-propanediol from a high-concentration sugar solution through one-step catalytic hydrogenation degradation. Background technique [0002] Ethylene glycol and propylene glycol are important energy liquid fuels, and are also very important raw materials for polyester synthesis, for example, for polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and It can be used as antifreeze, lubricant, plasticizer, surfactant, etc. It is a widely used petrochemical basic 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 ...
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