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Method for preparing 1,2-propanediol by platinum tin-mesoporous alumina catalysis of carbohydrates

A technology of alumina catalytic carbon and mesoporous alumina, which is applied in the preparation of hydroxyl compounds, organic compounds, chemical instruments and methods, etc., can solve the problems of low product concentration, difficulty in culturing bacteria, long production cycle, etc., and achieve Wide range of sources, good stability and easy separation effect

Active Publication Date: 2017-06-20
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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  • Method for preparing 1,2-propanediol by platinum tin-mesoporous alumina catalysis of carbohydrates

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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 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 an oven at 120°C 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 by platinum tin-mesoporous alumina catalysis of carbohydrates. According to the method, the carbohydrates are used as raw material, water is used as a solvent, mesoporous alumina supported platinum tin bimetal is used as a catalyst, and under hydrothermal conditions of the temperature of 120-300 DEG C and the hydrogen pressure of 1-15 MPa, through a one-step catalytic conversion process, the 1,2-propanediol is prepared from the carbohydrates with high efficiency, high selectivity and high yield. Compared with a conventional petroleum based 1,2-propanediol synthesis route, the reaction provided by the invention has the advantages of raw materials as renewable resources, high atom economy and environmental friendliness. In addition, compared with other technologies for preparing 1,2-propanediol with biomass as raw material, the process has the advantages of good stability of the catalyst, good circularity, easy recovery and the like.

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 Applications(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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