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A kind of method for preparing ethylene glycol

A technology of ethylene glycol and catalyst, which is applied in the field of catalyst and its application, can solve the problems of poor cycle stability of catalyst, low selectivity of ethylene glycol, cumbersome preparation process, etc., and achieve high atom economy and high product yield and selectivity, preparation of simple effects

Active Publication Date: 2015-08-26
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 above-mentioned catalysts either have low selectivity to ethylene glycol, or the preparation process is cumbersome, the preparation cost is high, or the cycle stability of the catalyst is not good.

Method used

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  • A kind of method for preparing ethylene glycol
  • A kind of method for preparing ethylene glycol
  • A kind of method for preparing ethylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of metal catalysts Raney Ni, Raney Co, Raney Fe, Raney Cu:

[0020] Raney Ni: Add a Ni-Al alloy with a Ni / Al ratio of 1:1 to a 20% sodium hydroxide solution at 50°C within 20 minutes, then heat to 80°C, and keep it at 80°C for 120 minutes, and keep stirring during the whole process . After the reaction, cool down, filter, wash the filter cake with ethanol three times and then wash with distilled water to PH=7, and finally store the prepared Raney nickel in absolute ethanol for later use (see patent: Prepared with Raney nickel as catalyst The method of 3-amino-4-methoxyacetanilide, CN101880242).

[0021] In the same way, Co / Al alloy, or Fe / Al alloy, or Cu / Al alloy is activated to produce Raney Co, Raney Fe, and Raney Cu in sequence.

[0022] The amorphous Raney nickel catalyst is a commercial catalyst purchased directly from Anshan Zhongli Catalyst Factory, model ZL-N311.

Embodiment 2

[0024] Catalytic conversion experiment: Add 10.0g of polyol, 0.3g of catalyst A, 0.1g of catalyst B and 100ml of water into a 200ml reaction kettle, replace the gas with hydrogen for three times, fill with hydrogen to 5MPa, heat up to 240°C for 30min . After the reaction, cool down to room temperature, take the centrifuged supernatant, separate it on a high-performance liquid chromatography calcium-type ion-exchange column and detect it with a differential refraction detector. In the product yield, only the target products ethylene glycol, propylene glycol and hexahydric alcohols (including sorbitol and mannitol) are calculated, and other liquid products include butylene glycol, ethanol, unknown components, and gas products (CO 2 , CH 4 , C 2 h 6 etc.) The yield was not calculated.

Embodiment 3

[0026] In the composite catalyst, catalyst A is different metals, catalyst B is tungstic acid, and the reaction conditions are the same as in Example 2. The catalytic conversion results of cellulose on various composite catalysts (catalyst A + catalyst B) (Table 1).

[0027] Table 1 Catalytic conversion results of cellulose on various catalysts

[0028]

[0029] Amorphous Raney nickel catalyst* is ZL-N311 catalyst of Anshan Zhongli Catalyst Factory.

[0030] As shown in Table 1, cellulose can be converted into ethylene glycol with high yield on the combined catalyst involved in the present invention. Among them, the combination catalyst composed of Raney Ni or amorphous nickel alloy catalyst and tungstic acid has the best performance, which is significantly higher than the combination catalyst composed of other non-supported noble metal or non-noble metal catalyst and tungstic acid, and the yield of ethylene glycol It can reach 70%.

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Abstract

The invention provides a method of preparing ethylene glycol. Ethylene glycol can be prepared from a polyhydroxyl compound such as cellulose, starch, hemicellulose, cane sugar, glucose, fructose and levan with high selectivity. The method comprises the following steps: carrying out a catalytic hydrogenation reaction in water in a sealed high pressure reaction kettle to prepare ethylene glycol by the polyhydroxyl compound with high selectivity, wherein a catalyst is a mixture of a catalyst A and a catalyst B, the catalyst A is a metal framework catalyst which takes Ni as a main active component and the catalyst B is one or more of oxides or hydroxides of tungsten. The method provided by the invention has the remarkable advantages of simple preparation of the catalyst, low cost and good stability.

Description

technical field [0001] The invention relates to a catalyst and its application, in particular to a reaction process in which polyhydroxy compounds pass through the catalyst described in the invention under hydrothermal conditions to produce ethylene glycol through one-step catalytic hydrogenation degradation with high selectivity. Background technique [0002] Ethylene glycol is an important energy liquid fuel, and is also a very important raw material for polyester synthesis, for example, for polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and can also be used for As antifreeze, lubricant, plasticizer, surfactant, etc., it is a widely used organic chemical raw material. [0003] The use of renewable biomass to prepare ethylene glycol can reduce human dependence on fossil energy materials, and is conducive to the realization of environmental friendliness and sustainable economic development. At present, the technology of preparing polyols from polyols [Doc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/00B01J25/02
CPCY02P20/52
Inventor 张涛邰志军郑明远王爱琴
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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