Method for preparing ethylene glycol by using dimethyl oxalate plus hydrogen

A technology containing dimethyl oxalate and dimethyl oxalate, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., to achieve the effects of good selectivity, easy industrial production, and low cost

Inactive Publication Date: 2009-06-03
SHANGHAI UNIV OF ENG SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing ethylene glycol by using dimethyl oxalate plus hydrogen
  • Method for preparing ethylene glycol by using dimethyl oxalate plus hydrogen
  • Method for preparing ethylene glycol by using dimethyl oxalate plus hydrogen

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Embodiment 1

[0044] Cu-B / γ—Al 2 o 3 Preparation of amorphous catalyst (Cu 20w%, B=6w%)

[0045] (1) Weigh 8g of carrier γ-Al 2 o 3 , roasted at 600°C for 6h;

[0046] (2) At room temperature, under a vacuum of 0.04Mpa, the formed γ-Al 2 o 3 Immerse in 16g of copper nitrate aqueous solution, dry at 120°C for 10h, wash the impregnated γ-Al 2 o 3 to Cu-free 2+ precipitation;

[0047] The weight of the copper in the copper nitrate aqueous solution is 2g;

[0048] (3) Add 20g of NaBH to the product of step (2) at 0°C in a nitrogen atmosphere 4 -The KOH aqueous solution is reduced until no more gas is released in the system, washed, and the reaction product is collected, which is the catalyst of the present invention, put into absolute ethanol and preserved for subsequent use;

[0049] NaBH 4 —In KOH aqueous solution, NaBH 4 The weight concentration of KOH is 60%, and the weight concentration of KOH is 40%;

[0050] figure 1 It is the catalyst XRD spectrum, see curve 1 in the figu...

Embodiment 2

[0052] Cu-Co-B / γ—Al 2 o 3 Preparation of amorphous catalyst (Cu 15w%, B=5w%, Co 5w%)

[0053] (1) Weigh 8g carrier γ-Al 2 o 3 , roasted at 900°C for 2h;

[0054] (2) At room temperature, under a vacuum of 0.04Mpa, the formed γ-Al 2 o 3 Immerse in 16g of copper nitrate and cobalt nitrate aqueous solution, dry at 100°C for 6 hours, wash the impregnated γ-Al 2 o 3 to Cu-free 2+ precipitation;

[0055] The weight of copper in the copper nitrate aqueous solution is 1.5g; The weight of cobalt in the cobalt nitrate solution is 0.5g;

[0056] (3) With the product of step (2), at 0°C, in a nitrogen atmosphere, add 20g NaBH 4 —The KOH aqueous solution is reduced until there is no gas release in the system, washing and collecting the reaction product, which is the catalyst of the present invention, which is Cu-Co-B / Al 2 o 3 Amorphous alloy catalyst, stored in absolute ethanol for later use; NaBH 4 —In KOH aqueous solution, NaBH 4 The weight concentration of KOH is 60%, and ...

Embodiment 3

[0058] Cu-B / SiO 2 Preparation of amorphous catalyst (Cu 20w%, B=6w%)

[0059] The preparation method is the same as in Example 1, wherein, in step (3), the product of step (2) is added to 20 g of NaBH in a nitrogen atmosphere at 0°C 4 —KOH aqueous solution, NaBH 4 —In KOH aqueous solution, NaBH 4 The weight concentration of KOH is 60%, and the weight concentration of KOH is 40%;

[0060] The catalyst 3 of the present invention was obtained.

[0061] figure 2 It is the catalyst XRD spectrum, see curve 1 in the figure. Figure 4 It is the catalyst DTA diagram, see the curve 1 in the figure.

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Abstract

The invention discloses a method for preparing ethylene glycol by using dimethyl oxalate plus hydrogen. The method comprises the following steps: in the presence of a catalyst, methanol solution containing dimethyl oxalate is contacted with hydrogen, and then ethylene glycol is acquired. The method is characterized in that according to weight percentage, the catalyst consists of the following components: 70 to 80 percent of carriers, 15 to 22 percent of copper, 5 to 8 percent of boron, and 0 to 4 percent of active metal additives. The method has the characteristics of low reaction temperature, high reaction activity, good selectivity, simple catalyst preparation process and low cost, and is easy for conducting industrial production.

Description

technical field [0001] The invention relates to a method for preparing ethylene glycol by hydrogenating dimethyl oxalate, in particular to a catalyst for preparing ethylene glycol by hydrogenating dimethyl oxalate. Background technique [0002] Since the oil crisis in the 1970s, countries all over the world have devoted a lot of manpower and material resources to the development of alternative resources for oil. 1 Chemical research is the most active and has become a hot topic in the world in the 1980s. Among them, the production of ethylene glycol (EG), a product widely used in industry, from syngas to replace the ethylene-based petroleum route has important practical significance. [0003] The production of ethylene glycol from synthesis gas can be divided into direct method and indirect method. The direct method requires high temperature and pressure and precious metals as catalysts, which is far from industrial production. In the indirect method, firstly, oxalic acid di...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/149B01J23/72B01J23/89
CPCY02P20/52
Inventor 唐博合金徐菁利谢庆华曹俭赵家昌孙彦刚陈艳青郑静李洪森
Owner SHANGHAI UNIV OF ENG SCI
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