Preparation of 1,2-Propanediol from Carbohydrates Catalyzed by Platinum Tin-Mesoporous Alumina

A technology of alumina catalyzing carbon and mesoporous alumina is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, chemical instruments and methods, etc. It can solve the problems of low product concentration, long production cycle and high economic cost, and achieve a wide range of sources. , high selectivity, cost-saving effect

Active Publication Date: 2020-04-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The preparation of 1,2-propanediol by chemical method is mostly carried out in autoclave. The reaction has the disadvantages of high economic cost, low selectivity of 1,2-propanediol, and difficulty in catalyst recovery and utilization, which has great limitations in industrial application.
Biological fermentation methods generally have problems such as difficulty in cultivating strains, low product concentration, long production cycle, numerous fermentation operations, and difficult separation and treatment of products and fermentation liquid.

Method used

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  • Preparation of 1,2-Propanediol from Carbohydrates Catalyzed by Platinum Tin-Mesoporous Alumina
  • Preparation of 1,2-Propanediol from Carbohydrates Catalyzed by Platinum Tin-Mesoporous Alumina
  • Preparation of 1,2-Propanediol from Carbohydrates Catalyzed by Platinum Tin-Mesoporous Alumina

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Preparation of carrier mesoporous alumina: 3.5 g of aluminum sec-butoxide was dissolved in 100 ml of deionized water at 75° C. with vigorous stirring. Then raise the temperature of the solution to 90°C for 1 hour to form a suspension with precipitation, then add nitric acid to adjust the pH value of the system to 2 to accelerate the gelation, and finally rise to 95°C and reflux for 10 hours to obtain a stable boehmite sol system . The obtained sol was dried under microwave radiation for 25 minutes, and the temperature of the sample was controlled at 120-150°C to obtain mesoporous alumina.

Embodiment 2

[0029] Preparation of carrier mesoporous alumina: 2.0 g of aluminum chloride was dissolved in 100 ml of deionized water under the condition of vigorous stirring at 85°C. Then raise the temperature of the solution to 95°C for 2 hours to form a suspension with precipitation, then add nitric acid to adjust the pH value of the system to 4 to accelerate the gelation, and finally rise to 100°C and reflux for 12 hours to obtain a stable boehmite sol system . The obtained sol was dried under microwave radiation for 35 minutes, and the sample temperature was controlled at 150-200°C to obtain mesoporous alumina.

Embodiment 3

[0031] Preparation of platinum-tin catalyst supported on mesoporous alumina: The active components platinum and tin were loaded onto mesoporous alumina by equal volume impregnation method: tin tetrachloride and chloroplatinic acid were dissolved in 2 mL of deionized water, and then 1.5 Add g mesoporous alumina into the completely dissolved solution, stir evenly and let it stand at room temperature for 24 hours, then put it in a 120°C oven for 12 hours, and bake the dried catalyst in air at 450°C for 2 hours. Finally, it was reduced in hydrogen at 300°C for 2h.

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Abstract

The invention provides a method for preparing 1,2-propanediol from carbohydrates catalyzed by platinum tin-mesoporous alumina. In this method, carbohydrates are used as reaction raw materials, water is used as solvent, platinum-tin bimetal supported by mesoporous alumina is used as catalyst, and a catalytic conversion process is carried out under the hydrothermal conditions of 120-300°C and hydrogen pressure of 1-15MPa. Realize the preparation of 1,2-propanediol from carbohydrates with high efficiency, high selectivity and high yield. Compared with the existing petroleum-based 1,2-propanediol synthesis route, the reaction provided by the invention has the advantages of renewable raw materials, high atom economy and environmental friendliness. In addition, compared with other technologies that use biomass as raw material to produce 1,2-propanediol, this process has the advantages of good catalyst stability, good recyclability, and easy recovery.

Description

technical field [0001] The invention relates to a method for preparing 1,2-propanediol from carbohydrates catalyzed by platinum tin-mesoporous alumina, in particular to the process of preparing ethylene glycol through catalytic conversion of carbohydrates under hydrothermal conditions. Background technique [0002] 1,2-propanediol is an important energy liquid fuel and a very important raw material for polyester synthesis. 1,2-propanediol is mainly used as an intermediate in the production of unsaturated resins, epoxy resins, polyurethane resins, etc., and its consumption is about 45% of the total consumption of 1,2-propanediol. Due to its good viscosity, hygroscopicity and low toxicity, 1,2-propanediol is widely used as hygroscopic agent, antifreeze agent, lubricant and solvent in food, medicine, cosmetics and other hygienic products. [0003] At present, the industrial production of 1,2-propanediol mainly adopts traditional 1,2-propanediol preparation methods, including d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/00C07C31/20C07C31/22B01J23/62
CPCB01J23/626C07C29/00C07C31/205C07C31/225
Inventor 孙睿岩郑明远张涛王爱琴王晓东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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