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A kind of preparation method of highly active copper alginate catalyst

A copper alginate and catalyst technology, which is applied in the preparation of organic compounds, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve the problems of limited metal loading and low catalyst activity, so as to reduce the difficulty of preparation and solve the problem of acid Alkali-dependent, inexpensive effect

Inactive Publication Date: 2019-11-05
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of sodium alginate's own structure, its metal loading is limited, resulting in low activity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Dissolve 5.0 g of sodium alginate in 200 mL of deionized water, add 5.7 g of sodium periodate, and add 50 mL of ethanol. The reaction is carried out at room temperature in the dark, and magnetically stirred for 24 h.

[0021] (2) Continue to add 10 mL of ethylene glycol to step (1), and add 5 g of NaCl after 2 h of reaction.

[0022] (3) Mix the solution in step (2) with 700 mL of ethanol to precipitate crude alginic acid dialdehyde, filter it with suction, dissolve the filter cake in 100 mL of deionized water, mix it with 600 mL of ethanol, and filter it with suction , the above operation is repeated three times.

[0023] (4) Dry the filter cake finally obtained in step (3) at room temperature to obtain dry alginic acid dialdehyde.

[0024] (5) Weigh 1.0 g of alginic acid dialdehyde obtained in step (4), add it to 30 mL of water, then add 0.4 mL of methylamine aqueous solution and 0.6 g of copper acetate, and magnetically stir at room temperature for 12 h. After t...

Embodiment 2

[0027] Steps (2)-(6) are the same as in Example 1. Change 0.6 g of copper acetate into 1.2 g of copper acetate in the operation (1).

Embodiment 3

[0029] Steps (2)-(6) are the same as in Example 1. Change 0.6 g of copper acetate into 1.8 g of copper acetate in operation (1).

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Abstract

The invention discloses a preparation method of a high-activity copper alginate catalyst. The high-activity copper alginate catalyst is prepared from biopolymer, namely copper alginate, which is wide in resource, low in price, free of toxicity and environmentally friendly. Transitional metal copper ion (Cu2+) serves as the active center of the high-activity copper alginate catalyst; the high-activity copper alginate catalyst is characterized in that adjacent hydroxy of sodium alginate is oxidized into aldehyde group to obtain an intermediate product, namely dialdehyde alginate, and dialdehyde alginate is subjected to further imidization and then is in cross-linking with metal ion so as to obtain the high-activity copper alginate catalyst. The preparation method has the advantage of increasing metal loading quantity (namely quality of active sites ) to improve catalytic activity of the catalyst.

Description

technical field [0001] The invention relates to a method for preparing a highly active copper alginate catalyst. Background technique [0002] Hydroquinone is an important chemical product with broad application prospects. At present, the main process route for preparing quinone is to use hydrogen peroxide as an oxidizing agent to directly hydroxylate phenol. Commonly used catalysts for phenol hydroxylation mainly include transition metal ion catalysts, molecular sieve catalysts, metal oxide catalysts and heteropoly compound catalysts. However, transition metal ion catalysts are difficult to separate, cause serious pollution, are expensive, and are difficult to realize industrialization. Molecular sieve catalyst products are unstable and have poor reproducibility, and their performance and preparation are still under further study; heteropoly compound catalysts use acetonitrile as the reaction medium, and the reaction process is highly toxic, and the ratio of phenol to hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/12C07C37/60C07C39/08
CPCB01J31/123C07C37/60C07C39/08
Inventor 史丰炜王连旭李忠序单聪
Owner CHANGCHUN UNIV OF TECH
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