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Catalyst for preparing 1, 2-trimethylene glycol by glycerol hydrogenoiysis and preparation thereof

A glycerin hydrogenolysis and catalyst technology, which is applied in the direction of eliminating hydroxyl groups, can solve the problems of poor catalyst activity and stability, and achieve long-term stable activity, high single-pass conversion rate, and high selectivity.

Inactive Publication Date: 2008-07-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problem of poor catalyst activity and stability in the process of hydrogenolysis of glycerol to 1,2-propanediol at present, the purpose of this invention is to provide a catalyst for hydrogenolysis of glycerol to 1,2-propanediol, which has a highly stable catalytic performance, so that the continuous hydrogenolysis of glycerol to 1,2-propanediol can be realized, and the glycerol by-product of biodiesel can be effectively utilized; application in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 34.7904g copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) and 63.4667g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), 1.0168g yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O) and 6.6199g aluminum nitrate (Al(NO 3 ) 3 9H 2 O) be dissolved in 200ml water and be prepared into solution, this solution is mixed with 2M Na 2 CO 3 The solution was stirred and precipitated at 75°C, and the pH value of the solution was controlled at 7-8. After the precipitation is completed, stir at constant temperature for 3 hours, and then age at 75°C for 2 hours, then the precipitate is washed, filtered, dried, heated to 450°C at 10°C / min, roasted at constant temperature for 4 hours, pressed into tablets, and ground After sieving (20-40 meshes), the obtained catalyst is code-named A, and the code-named catalyst contains (weight percent) 38.4% copper oxide, 57.6% zinc oxide, 1% yttrium oxide, and 3% aluminum oxide.

Embodiment 2

[0018] 17.5764g copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) and 49.8772g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and 2.0336g yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O) be dissolved in 200ml water and be prepared into solution, this solution is mixed with 2M Na 2 CO 3 The solution was mixed, stirred and precipitated at 75°C, and the pH value of the solution was controlled at 7-8. After the precipitation is completed, stir at constant temperature for 3 hours, and then age at 75°C for 2 hours, then the precipitate is washed, filtered, dried, heated to 450°C at 10°C / min, roasted at constant temperature for 4 hours, pressed into tablets, and ground Sieve (20-40 meshes) to obtain a catalyst code-named B, and the catalyst code-named B contains (percentage by weight) copper oxide 29.1%, zinc oxide 57.9%, and yttrium oxide 3%.

Embodiment 3

[0020] 23.6719g copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) and 43.6243g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and 2.0406g yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O) be dissolved in 200ml water and be prepared into solution, this solution is mixed with 2M Na 2 CO 3 The solution was mixed, stirred and precipitated at 75°C, and the pH value of the solution was controlled at 7-8. After the precipitation is completed, stir at constant temperature for 3 hours, and then age at 75°C for 2 hours, then the precipitate is washed, filtered, dried, heated to 450°C at 10°C / min, roasted at constant temperature for 4 hours, pressed into tablets, and ground Sieve (20-40 meshes) to obtain a catalyst code-named C, which contains (weight percent) 38.8% of copper oxide, 58.2% of zinc oxide, and 3% of yttrium oxide.

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Abstract

The invention relates to a catalyst of a 1, 2-propanediol prepared by hydrogenolysis of glycerine. The catalyst is a compound oxide, and contains cuprocide (weight fraction) 25 percent to 60 percent, zinc oxide 35 percent to 70 percent, aluminum oxide (weight fraction) 0 percent to 10 percent and at least one or a plurality of rare-earth oxides 0.5 percent to 10 percent of rare earth elements, such as Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, etc. The catalyst is used in continuous hydrogenolysis reaction of glycerine, in which the conversion rate of the glycerine is high, the selectivity of the 1, 2-propanediol is high and the activity of the catalyst is very stable. The invention also provides the preparation method of the catalyst and application of the catalyst in preparation of 1, 2-propanediol by hydrogenolysis reaction of glycerine.

Description

technical field [0001] The invention relates to a catalyst for hydrogenolysis of glycerin to prepare 1,2-propanediol and a preparation method of the catalyst. Background technique [0002] In recent years, with the shortage of energy in the world, the biodiesel industry has developed rapidly. The preparation of biodiesel produces a large amount of by-product glycerol. The excess bio-based glycerin is rationally used to develop high value-added products, making it a bio-based chemical for the production of other bio-based chemicals. Cheap raw materials will help increase the economic benefits of the entire biodiesel industry. [0003] On the other hand, 1,2-propanediol is an important chemical basic raw material and has a wide range of uses in many fields. The raw material for traditional propylene glycol production mainly comes from petroleum propylene oxide. Due to the impact of petroleum prices, the raw material cost of 1,2-propylene glycol continues to increase. In orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/80C07C31/20C07C29/60
Inventor 陈长林李迎宾杜智群於德伟肖春霞陈晓蓉秦丽珍
Owner NANJING UNIV OF TECH
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