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A kind of method for preparing ethylene glycol by catalytic conversion of carbohydrates

A carbohydrate and catalytic conversion technology, which is applied in the preparation of hydroxyl compounds, organic compounds, chemical instruments and methods, etc., can solve the problems of high technical difficulty, many by-products, low efficiency, etc., and achieve good cycle performance and corrosion resistance small, selective effect

Active Publication Date: 2016-08-10
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 synthesis method relies on non-renewable petroleum resources, and the production process includes selective oxidation or epoxidation steps, which are technically difficult, low in efficiency, with many by-products, high energy consumption and serious pollution

Method used

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  • A kind of method for preparing ethylene glycol by catalytic conversion of carbohydrates
  • A kind of method for preparing ethylene glycol by catalytic conversion of carbohydrates
  • A kind of method for preparing ethylene glycol by catalytic conversion of carbohydrates

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Experimental program
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Effect test

Embodiment 1

[0025] Preparation of lanthanum-based catalysts: non-supported catalysts such as lanthanum oxides, hydroxides, and salts are commercial drugs purchased directly, and the purity grades of the drugs are all analytically pure. In the supported catalyst, the active component is loaded on the carrier, and the carrier is a composite carrier of one or more of activated carbon, alumina, silicon oxide, silicon carbide, zirconia, zinc oxide, and titanium dioxide, and the metal salt of lanthanum (The anion can be one or more of nitrate, chloride or bromide) The aqueous solution is loaded onto the carrier by equal volume impregnation, dried overnight at 120°C, and then calcined at 700°C for 4h under N2 atmosphere.

Embodiment 2

[0027] Preparation of metal hydrogenation catalyst: use one or more of activated carbon, alumina, silicon oxide, silicon carbide, zirconia, zinc oxide, and titanium dioxide as a carrier, and chloroplatinic acid, palladium chloride, ruthenium chloride, and rhodium chloride The aqueous solutions of iridium chloride, nickel nitrate, iron nitrate and cobalt nitrate were respectively loaded on the carrier by equal volume impregnation method, and dried overnight at 120°C.

[0028] The above catalysts loaded with ruthenium, rhodium, palladium, iridium, platinum and other precious metals need to be reduced with hydrogen at 250°C for 2 hours and passivated for 4 hours under 1% O2 / N2 (V / V) atmosphere; , Cobalt and other non-noble metal catalysts need to be reduced with hydrogen at 450°C for 2 hours and passivated for 4 hours under 1% O2 / N2 (V / V) atmosphere before use.

Embodiment 3

[0030] Preparation of lanthanum oxide-supported nickel catalyst: Weigh 1.5g La2O3, 0.8g Ni(NO3)2·6H2O, dissolve nickel nitrate in 20ml water, then add La2O3 into the completely dissolved nickel nitrate solution, and place in a water bath at 25°C , and stirred for 12h until the solution evaporated completely. Dry in an oven at 120°C for 8h, calcinate at 500°C for 2h in N2 atmosphere, and then reduce for 5h at 500°C in H2 atmosphere.

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Abstract

The invention provides a method for preparing ethylene glycol by catalytic conversion of carbohydrates. The method uses carbohydrates as reaction raw materials, uses water as a solvent, and uses one or both of the simple substance or compound of lanthanum and group 8, 9, and 10 transition metals iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, and platinum. The catalyst composed of the above two is a composite catalyst. Under the hydrothermal conditions of 120-300°C and hydrogen pressure of 1-13MPa, it undergoes a one-step catalytic conversion process to realize the preparation of ethylene glycol with high efficiency, high selectivity and high yield from cellulose. Compared with the existing synthetic route of petroleum-based ethylene glycol, the reaction provided by the invention has the advantages of renewable resources, high atom economy and environmental friendliness. In addition, compared with other technologies that use biomass as raw material to produce polyols, this process has the advantages of less catalyst consumption, good circulation, and less corrosion to reaction equipment.

Description

technical field [0001] The invention relates to a method for catalytic conversion of carbohydrates to ethylene glycol, in particular to the process of preparing ethylene glycol through catalytic conversion of carbohydrates under hydrothermal conditions. Background technique [0002] Ethylene glycol is an important energy liquid fuel and a very important raw material for polyester synthesis (polyethylene terephthalate (PET), polyethylene naphthalate (PEN)), and can also be used as Antifreeze, lubricants, plasticizers, and surfactants are widely used organic chemical raw materials. [0003] At present, the industrial production of ethylene glycol mainly adopts the route of petroleum raw materials, that is, ethylene oxide is obtained after epoxidation of ethylene, and then ethylene glycol is obtained by hydration (Document 1: Cui Xiaoming, Overview of ethylene glycol production and development at home and abroad, Chemical Industry, 2007, 25, (4), 15-21. Document 2: Process for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/00B01J23/63B01J23/83
CPCY02P20/52
Inventor 张涛孙睿岩郑明远庞纪峰姜宇王爱琴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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