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A kind of method for preparing ethylene glycol by hydrogenation of methyl glycolate
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A technology of methyl glycolate and ethylene glycol is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., to achieve the effects of less loss, improved hydrogenation activity, and improved conversion rate
Active Publication Date: 2021-06-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
In recent years, there have been many reports on the efficient hydrogenation of methyl glycolate, but the development of new catalysts for the hydrogenation of methyl glycolate with high activity is still a challenging subject.
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Embodiment 1
[0045] The preparation of embodiment 1 catalyst
[0046] Preparation of catalyst sample C-1#
[0047] (1) Add 10g of melamine, 2g of 3,5-diaminopyridine, and 20g of terephthalaldehyde into dimethyl sulfoxide, and heat to 180°C under the condition of vigorous stirring, so that the three are evenly polymerized, and the polymerization time is 48h . The obtained solid A was subjected to Soxhlet extraction with methanol as a solvent, extracted for 72 hours, and dried to obtain the porous organic polymer (POP-1-A) containing a triazine structure;
[0048] (2) Disperse POP-1-A in 150mL of acetonitrile, add 80mL of an aqueous solution of copper nitrate with a concentration of 0.5mol / L, stir and reflux for 48h, filter, and dry to obtain the catalyst, which is recorded as sample C-1# .
[0049] Preparation of catalyst sample C-2#
[0050] (1) Add 10g of melamine, 2g of 2,6-diaminopyridine, and 25g of terephthalaldehyde into dimethyl sulfoxide, and heat to 200°C under vigorous stirri...
Embodiment 2
[0058] The TEM test of embodiment 2 catalyst
[0059] The catalyst samples C-1#~C-4# were characterized by TEM. Taking sample C-1# as a typical representative, its TEM photo is as follows figure 1 shown by figure 1 It can be seen that the material is amorphous and porous.
[0060] TEM images of the remaining samples with figure 1 similar.
Embodiment 3
[0061] N of the catalyst of embodiment 3 2 Physical adsorption test
[0062] Nitrogen physical adsorption tests were carried out on catalyst samples C-1# to C-4# respectively. Taking sample C-1# as a typical representative, its physical adsorption curve is as follows figure 2 shown by figure 2 It can be seen that the material is porous, with a specific surface area of about 450m 2 / g, and more micropores.
[0063] The physical adsorption curves of the remaining samples are similar to those of sample C-1#.
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Abstract
The present application discloses a method for preparing ethylene glycol by hydrogenating methyl glycolate. Methyl glycolate is passed into a reactor equipped with a catalyst to catalyze the reaction to obtain ethylene glycol; wherein, the carrier of the catalyst includes A porous organic polymer containing a triazine structure complexes Cu active sites on the surface of the support. The method improves the conversion rate of methyl glycolate and the selectivity of ethylene glycol; the catalyst used in the preparation method provided by the application significantly improves the hydrogenation activity of methyl glycolate, and the Cu in the catalyst is not easy to lose ,long lasting.
Description
technical field [0001] The application relates to a method for preparing ethylene glycol by hydrogenating methyl glycolate, which belongs to the technical field of chemical preparation. Background technique [0002] Methyl glycolate is an important chemical raw material and pharmaceutical intermediate, widely used in chemical, pharmaceutical, dyestuff and other fields. Methyl glycolate can undergo hydrogenation reaction, hydrolysis reaction, oxidation reaction and carbonylation reaction, etc., which makes methyl glycolate an important organic reaction intermediate. Among them, the hydrogenation of methyl glycolate to ethylene glycol is an important ethylene glycol production route and one of the technologies for potential large-scale application. [0003] The unique molecular structure and properties of methyl glycolate make its chemical properties relatively stable, it is not easy to gain or lose electrons, and its hydrogenation reaction activity is relatively weak. Durin...
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