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Method for preparing 1,2-propanediol through glycerol hydrogenation

A technology for hydrogen preparation and propylene glycol, applied in the field of glycerol hydrogenation preparation 1, can solve problems such as harm to human health, high equipment investment and maintenance requirements, pollution, etc., and achieves long service life, reduced equipment investment and maintenance, and good selectivity. Effect

Inactive Publication Date: 2011-05-04
南京大学扬州化学化工研究院 +1
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Problems solved by technology

U.S. Patent Application Publication US2008 / 0045749 describes the method of hydrogenation of glycerol to generate 1,2-propanediol under the action of a copper-chromium catalyst, and reports that when the reaction pressure is 3.2 MPa, the composition of the final product varies with the flow rate of glycerol, the flow rate of hydrogen, and the reaction temperature. and pressure changes, but the catalyst used will pollute the environment due to the chromium element, which seriously endangers human health
U.S. Patent Application Publication US2008 / 0103339 adopts the hydrogenation of glycerin under the action of nickel-rhenium as an active component to prepare 1,2-propanediol, and the volume space velocity of glycerol is 0.5h -1 ~2.5h -1 , the reaction pressure is 8-11MPa, the reaction temperature is 150-240°C, the conversion rate of glycerin is 96.4%, and the selectivity of 1,2-propanediol is 94%. However, due to the relatively high reaction pressure, this requires equipment investment and maintenance. higher

Method used

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  • Method for preparing 1,2-propanediol through glycerol hydrogenation

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Experimental program
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Embodiment 1

[0009] A fixed-bed reactor with a length of 50 cm and an inner diameter of 6 mm is used. Glycerin aqueous solution and hydrogen enter the reaction tube from the upper end, and the liquid phase product is condensed and collected at the lower end of the reaction tube.

[0010] The mass composition of the non-oxygen elements of the catalyst is: 67%Cu-27%Zn-3%Al-3%C.

[0011] Catalyst dosage 0.9g, hydrogen reduction at 300°C for 3h, reaction temperature 250°C, pressure 2MPa, glycerol aqueous solution mass concentration 20%, glycerol solution flow rate 3ml / h, volumetric space velocity 3h -1 , H 2 The molar ratio to glycerin is 36.

[0012] Glycerol aqueous solution and hydrogen gas were passed through the catalyst bed, and the liquid phase product was collected by condensation in an ice-water bath at the lower end of the reaction tube. Samples were taken every 4 hours for chromatographic analysis. The analysis results are shown in Table 1.

Embodiment 2

[0014] Glycerol concentration is 40%, H 2 Except that the glycerin molar ratio is 18, other conditions are the same as in Example 1, and the analysis results are shown in Table 1.

Embodiment 3

[0016] In addition to glycerol concentration of 60%, H 2 Except that the glycerol molar ratio is 12, other conditions are the same as in Example 1, and the analysis results are shown in Table 1.

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Abstract

The invention provides a method for preparing 1,2-propanediol through glycerol hydrogenation. In the method, a copper-zinc-aluminum-carbon multiple-component composite catalyst is used; and the reaction temperature is 220-280 DEG C, the reaction pressure is 1.5-4Mpa; and the used catalyst contains the following non-oxygen elements by weight percent: 20-80% of Cu, 15-70% of Zn, 0.1-5% of Al and 1-6% of C. In the method provided by the invention, relatively lower reaction pressure is adopted, thus the investment cost and maintenance cost of the equipment can be reduced; and the catalyst has the advantages of long service life, high activity and excellent selectivity, and can work continuously and be suitable for industrialized sustainable production.

Description

1. Technical field: [0001] The invention relates to a method for preparing 1,2-propanediol through hydrogenation of glycerin. 2. Background technology: [0002] Biodiesel is a renewable and clean energy that has been promoted worldwide in recent years. Vigorously developing biodiesel technology has important strategic significance for sustainable economic development, promoting energy substitution, reducing environmental pressure, and controlling urban air pollution. How to effectively reduce the production cost of biodiesel technology, and how to convert glycerol, a by-product of biodiesel, into propylene glycol with high economic added value, are increasingly attracting the attention of more green chemical workers. 1,2-propanediol is an important chemical raw material, the main raw material for the production of unsaturated polyester resin, and also the raw material for plasticizers, dehydrating agents, surfactants, curing agents, and binders. The production field is in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/60B01J23/80
Inventor 范以宁高强许波连
Owner 南京大学扬州化学化工研究院
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