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A method for producing ethylene glycol by catalytic conversion of cellulose inhibiting the generation of cyclic ether alcohols

A technology of catalytic conversion and cellulose, applied in chemical instruments and methods, organic chemistry, preparation of hydroxyl compounds, etc., can solve the problems of difficult rectification separation and removal, reduce the difficulty of rectification separation, reduce the generation of by-products, and achieve high yields. rate effect

Active Publication Date: 2014-10-22
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

The boiling point of these cyclic ether alcohols is relatively close to the boiling point of ethylene glycol at 197.8C, and it is difficult to effectively separate and remove them from ethylene glycol products by rectification
And these products have adverse effects on the use of ethylene glycol in polyester synthesis

Method used

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  • A method for producing ethylene glycol by catalytic conversion of cellulose inhibiting the generation of cyclic ether alcohols
  • A method for producing ethylene glycol by catalytic conversion of cellulose inhibiting the generation of cyclic ether alcohols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 10kg of corn stalk powder (20-40 mesh), add water to make the water content 30wt%, put it in a steam explosion reactor at 160°C, (pressure 1.0MPa) constant pressure for 60 seconds, and then perform steam explosion operation. To the obtained 8kg solid residue (dry weight), add 50kg concentration of 1wt% NaOH aqueous solution to it, soak 12h under room temperature 25 ℃, add 50kg concentration wherein to it after filtering out and be 1wt% hydrogen peroxide, soak 12h at room temperature, then Rinse with clear water until neutral to obtain 5 kg (dry weight) of corn stalk cellulose raw material.

[0020] The corn stalk powder is replaced by sorghum stalk, and the corresponding cellulose raw material can be obtained according to the same method as above.

Embodiment 2

[0022] Get 10.0g corn stalk cellulose (gained in embodiment 1) and add 100ml water, 0.1g tungstic acid, 0.1g 5%Ru / AC catalyst, 0.05g 0.5%Ir-1%ReOx / AC (0

Embodiment 3

[0026] Get 10.0g sorghum stalk cellulose (gained in embodiment 1) and add 100ml water, 0.1g ammonium metatungstate, 0.1g Raney nickel catalyst, 0.05g 2%Ru-0.2%Re / SiO 2 The reaction was carried out in a high-pressure reactor at 240° C. for 2 hours, the stirring speed was 500 rpm, and the hydrogen pressure was 7 MPa during the reaction. After the reaction is finished, cool down to room temperature, release the pressure, open the kettle and centrifuge to obtain a liquid product, and analyze the yield of polyol product and cyclic alcohol by-product by gas chromatography.

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Abstract

The invention provides a method capable of inhibiting generation of cyclic ether alcohol and used for preparing glycol by catalytic conversion of cellulose, characterized by conducting catalytic hydrogenation in an enclosed high pressure container with stirring at the reaction temperature of no less than 150 DEG C under the hydrogen pressure of 0.1-15 MPa, wherein the mass content of the reactant in the aqueous solution is 1-30 wt%, and the reaction time is no less than 5 min; the catalyst comprises an active ingredient A with the function of catalytic hydrogenation, a tungsten-containing active ingredient B with the function of catalyzing cellulose degradation, and a catalytic active ingredient C containing rhenium. According to the invention, cyclic ether alcohol by-product in the reaction products with the boiling point close to that of glycol is significantly reduced, thus impurities in subsequent distillation separation product of the glycol product are reduced, and the product purity of the glycol product is raised.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol, in particular to a method for preparing ethylene glycol by catalytic conversion of cellulose that suppresses the formation of cyclic ether alcohols. Background technique [0002] Ethylene glycol is an important basic energy chemical. In 2010, the consumption of ethylene glycol in the world was close to 20 million tons. It is mainly used in the synthesis of chemical fiber polyester, unsaturated resin, automobile antifreeze and chemical intermediates. At present, the production of ethylene glycol mainly depends on petroleum ethylene resources [Document 1: Cui Xiaoming, Overview of the Development of Ethylene Glycol Production at Home and Abroad, Chemical Industry, 2007, 25, (4), 15-21. Document 2: Process for preparing Ethanediol by catalyzing epoxyethane hydration, Patent No.CN1463960- CN1204103-C]. Using renewable biomass resources to synthesize ethylene glycol technology is one of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/00
Inventor 张涛郑明远庞纪峰姜宇李宁王爱琴王晓东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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