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A method for generating 1,2-propanediol by direct hydrogenolysis of aqueous glycerol

A propylene glycol and water-liquid technology, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, organic chemistry, etc., can solve the problem of high temperature and pressure requirements, high energy consumption and raw material costs, and catalyst systems Complicated problems, to achieve the effect of good stability, low cost, and low cost

Inactive Publication Date: 2017-10-10
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many reports about copper-based catalysts in the existing methods, the temperature and pressure are high and the reaction conditions are harsh; there are few reports about nickel-based catalysts because the reduction of by-products has always been difficult to achieve; although doping of other noble metals It can partially improve the selectivity of 1,2-propanediol, but the catalyst itself is expensive, the temperature and pressure requirements are also high, and the catalyst system is complex; the copper-based catalyst on the fixed bed device uses gas phase glycerol feed, which requires a high ratio of hydrogen to glycerol , energy consumption and raw material costs are very high, which is not conducive to industrial production

Method used

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  • A method for generating 1,2-propanediol by direct hydrogenolysis of aqueous glycerol
  • A method for generating 1,2-propanediol by direct hydrogenolysis of aqueous glycerol
  • A method for generating 1,2-propanediol by direct hydrogenolysis of aqueous glycerol

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preparation example Construction

[0036] Catalyst preparation and hydrogenation method:

[0037] 1. Pretreatment of carrier: sepiolite needs acid activation treatment. The method is as follows: first prepare dilute hydrochloric acid with a mass fraction of 10.0%, add ground sepiolite into a three-necked bottle with a mass ratio of 20:1, place it in an oil bath at 95°C, and continuously heat and reflux for 6 hours, take it out, wash it with distilled water for 5 times, and dry it continuously in an oven at 110°C for 12 hours after suction filtration, take it out and grind it into a fine powder, pass through a 160-mesh sieve, put the powder in a porcelain evaporating dish and send it into a muffle furnace , continuously calcined at 400°C for 6 hours, and cooled to form treated sepiolite carrier powder. Obtained by BET test, the specific surface area of ​​sepiolite powder before treatment is only 95.63m 2 / g, the specific surface area of ​​the treated sepiolite carrier is 226.73m 2 / g, the color becomes lighte...

Embodiment 1

[0040] Example 1: 20 ml of stainless steel high-pressure electric heating reactor for hydrogenation device, first add 16.0 ml of high-purity water, add 4.0 g of pure glycerin, use a magnet to stir for half an hour to form a uniform 20wt% glycerin aqueous solution, add 0.64 g of NaOH Stir the solid evenly, add 0.30 g of catalyst A after cooling, quickly close the autoclave, and replace the air in the autoclave with hydrogen for 3-4 times, start stirring, adjust the pressure of the hydrogen gas introduced to 2.0 MPa, and raise the temperature to 180°C. After continuous reaction for 6 hours, cool down, release the pressure at normal temperature, take out the product and weigh it, and take the upper liquid and centrifuge it for detection by gas chromatography external standard method. The calculated conversion rate and selectivity data of related species are shown in Table 1.

Embodiment 2

[0041] Embodiment 2: Catalyst B is selected, the hydrogenolysis reaction conditions are the same as in Embodiment 1, and the calculated conversion and selectivity data of related species are shown in Table 1.

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Abstract

The invention discloses a method for generating 1,2-propanediol by directly performing hydrogenolysis on a glycerol water solution. According to the method, by using Ni-WO3 / meerschaum as a catalyst, hydrogen is added under alkaline conditions to catalyze the one-step synthesis of 1,2-propanediol from the glycerol water solution. The Ni-WO3 / meerschaum supported catalyst can be utilized to implement one-step hydrogenolysis on glycerol in a water phase under mild conditions to generate the 1,2-propanediol with favorable effects, wherein the glycerol conversion rate can reach 87.01%, and the 1,2-propanediol selectivity can reach 96.67%. The reactant raw materials and catalyst are accessible, and have the advantages of low cost and high stability. The method has the advantages of mild reaction conditions and short process, is convenient to operate, and satisfies the industrial production requirements.

Description

technical field [0001] The invention relates to a synthesis method of 1,2-propanediol, in particular to a method for generating 1,2-propanediol by direct hydrogenolysis of aqueous glycerin. Background technique [0002] Energy issues have always been the focus of global science and technology. As a very important renewable energy source, glycerin is widely found in wastes from biological processing such as animal fats, vegetable oils or sugars. Clean biodiesel, which has emerged in recent years, can replace traditional fossil energy, and has been valued and vigorously developed. In the processed products of soybean, rapeseed, oil palm and other oil plants, there are more glycerin in animal fat and waste cooking oil, and glycerin can be produced in a large amount in a mass ratio of about 20% in the transesterification reaction. Glycerin is used as raw material The production process has attracted much attention. One-step hydrogenation of glycerol to produce 1,2-propanediol,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/60C07C31/20B01J23/888
CPCB01J23/888C07C29/60C07C31/205
Inventor 刘平乐龙威郝芳熊伟罗和安
Owner XIANGTAN UNIV
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