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Method for preparing ethylene glycol and 1,2-propylene glycol from cellulose in one step and catalyst thereof

A catalyst and cellulose technology, applied in the field of one-step preparation of ethylene glycol and 1,2-propanediol and its catalyst from cellulose, can solve the problems of high catalytic stability and conversion efficiency, low catalyst conversion efficiency, low cost, etc. Achieve the effects of simple composition, simple operation, and simple reaction equipment

Active Publication Date: 2019-03-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the conversion efficiency of such catalysts is not high (such as only reaching about 80% conversion rate), on the other hand, considering the cost and catalyst stability issues, the catalysts prepared from metal oxide supported hydrogenation metals need to have lower cost and high catalytic stability and conversion efficiency
[0005] Therefore, there is a need in this field to develop a new process capable of depolymerizing cellulose under mild conditions and with a simple reaction process to prepare ethylene glycol and 1,2-propanediol, and to develop a new type of loaded hydrogenation metal to prepare a simple structure, Catalysts with stable performance and high conversion efficiency are of great significance, especially the use of non-tungsten oxide as a carrier to support base metal Cu or Co as a hydrogenation metal in the field of catalyzing cellulose depolymerization has not been reported before.

Method used

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  • Method for preparing ethylene glycol and 1,2-propylene glycol from cellulose in one step and catalyst thereof
  • Method for preparing ethylene glycol and 1,2-propylene glycol from cellulose in one step and catalyst thereof
  • Method for preparing ethylene glycol and 1,2-propylene glycol from cellulose in one step and catalyst thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of 10% Co / CeOx Heterogeneous Catalyst

[0045] According to the general method described above, 3 g of cerium nitrate salt was dissolved in 100 mL of water to obtain an aqueous solution of cerium nitrate. Add 2.5% ammonia solution dropwise to precipitate the obtained cerium nitrate aqueous solution until the pH is 10, and stir at 40°C for 15h, and after suction filtration and distilled water washing, dry at 60°C for 8h, then dry at 550°C Calcined at ℃ for 2.5h to obtain CeO 2 carrier. 596.6mg of Co(NO 3 ) 2 ·6H 2 O was dissolved in 20 g of distilled water to obtain Co(NO 3 ) 2 aqueous solution, and 1.2 g of the CeO obtained above 2 The carrier was only ball milled and dispersed in distilled water to obtain CeO 2 Dispersions. Then, the obtained Co(NO 3 ) 2 aqueous solution was added to the obtained CeO 2 After stirring at 60° C. for 15 hours, the solvent was removed by rotary evaporation, and then dried at 100° C. for 8 hours to obtain a catalyst ...

Embodiment 2

[0050] The heterogeneous catalysts shown in Table 1 below were prepared and obtained by the same preparation and characterization procedures as in Example 1 except for changing the types and amounts of hydrogenation metals and support oxides. Moreover, the results of XRD characterization and TEM characterization (spectrum not shown) are similar to those of Example 1 above.

[0051] Catalyst application

Embodiment 3

[0053] 100 mg of ground corn stover cellulose powder and 100 mg of the 10% Co / CeOx heterogeneous catalyst prepared in Example 1 were added into a 50 mL autoclave. Add 10 mL of distilled water into the reaction kettle as a solvent, and keep the hydrogen pressure at 3 MPa, then heat to 245° C. through a heating mantle and react for 6 h under magnetic stirring. After the reaction, cool to room temperature and empty the reactor, and then filter to separate the catalyst from the reaction solution. The reaction liquid was diluted with methanol to prepare a sample for analysis, which was analyzed by gas chromatography. Based on the results of the gas chromatographic analysis, the conversion rate of the cellulose raw material and the total yield of the target products ethylene glycol and 1,2-propanediol were calculated, and the average value of the three repeated experimental results was shown in Experiment No. 1 of Table 1.

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Abstract

The invention discloses a method for preparing ethylene glycol and 1,2-propylene glycol from cellulose in one step and a catalyst thereof. The method comprises the following step: enabling the cellulose and hydrogen gas to react in the presence of the catalyst, wherein water, alkane, alcohol or a combination thereof is used as a solvent and the catalyst is a multi-phase catalyst composed of metaloxide used as a carrier and hydrogenated metal loaded on the carrier. By utilizing the method and the catalyst, disclosed by the invention, the ethylene glycol and the 1,2-propylene glycol can be prepared from the cellulose in one step, wherein the conversion ratio of the raw material cellulose can reach 100 percent and the total yield of the ethylene glycol and the 1,2-propylene glycol can reach95 percent or more, so that a brand new way is provided for catalytically producing the ethylene glycol and the 1,2-propylene glycol by directly utilizing a cellulose biomass raw material. Furthermore, the method disclosed by the invention has the advantages of simple technology, simple reaction equipment, convenience for operation and moderate reaction conditions; and meanwhile, the used catalystis cheap and easy to obtain, so that the method is more suitable for industrial production and has a very wide application prospect.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol and 1,2-propylene glycol from cellulose in one step and a catalyst thereof. Background technique [0002] Biomass is the only renewable source of organic carbon and is ideal as an alternative to petroleum for the production of fuels and chemicals. Therefore, the development of new routes and methods for the conversion of biomass to fuels and chemicals is an important goal for the future development of sustainable energy systems. The main part of biomass is cellulose, which is a macromolecule synthesized by glucose through glycosidic bonds, and converting them into other useful chemicals is a feasible way for cellulose conversion. [0003] At present, polyols such as ethylene glycol and 1,2-propanediol are important energy liquid fuels, and are also very important polyester raw materials. The industry mainly uses petroleum routes, that is, ethylene glycol, 1, 2-Propanediol. This method i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/00C07C31/20B01J23/885B01J23/882B01J23/83
CPCB01J23/83B01J23/882B01J23/885C07C29/00C07C31/202C07C31/205Y02P20/52
Inventor 张颖李闯傅尧
Owner UNIV OF SCI & TECH OF CHINA