Application of gold/mesoporous carbon catalyst in glucose selective oxidation reaction to prepare gluconic acid

A gluconic acid and selective oxidation technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, organic compound preparation, etc., can solve the problem of easy loss of active components and difficult recovery of precious metals in invalid catalysts and other issues to achieve high stability

Inactive Publication Date: 2010-08-18
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the active components of the catalyst are easy to lose during use, and the precious metals in the spent catalyst are also difficult to recover

Method used

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  • Application of gold/mesoporous carbon catalyst in glucose selective oxidation reaction to prepare gluconic acid
  • Application of gold/mesoporous carbon catalyst in glucose selective oxidation reaction to prepare gluconic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Embodiment 1: gold / mesoporous carbon-1 catalyst, 0.5M glucose aqueous solution, under the condition of 25 ℃, the conversion rate of glucose is 5%, the selectivity of gluconic acid is 99%, after reaction is carried out continuously for 120 hours, the catalyst's activity does not decay

[0012] The preparation of gold / mesoporous carbon-1 catalyst: 1) the preparation of mesoporous carbon: 25g pluronic (polyoxyethylene-polyoxypropylene copolymer) and 25g phloroglucinol are stirred and dissolved in 146g ethanol at 30 ℃ In the aqueous solution, wherein the mass ratio of ethanol and water is 10:9, then add 1.6ml of 37wt% HCl solution, after stirring for 2h, add 26g of 37wt% formaldehyde solution, after 1.5h, the solution is separated, take out the bottom solution, and stir overnight After curing at 100°C, in N 2 Carry out carbonization at 850°C under atmosphere to obtain mesoporous carbon-1, wherein the most probable pore diameter of mesoporous carbon-1 is 6.8 nm, and its por...

Embodiment 2

[0015] Example 2: gold / mesoporous carbon-2 catalyst, 0.5M glucose solution, under the condition of 50 ℃, the conversion rate of glucose is 27%, the selectivity of gluconic acid is 99%, after the reaction is carried out continuously for 120 hours, the activity of the catalyst no attenuation

[0016] The preparation of gold / mesoporous carbon-2 catalyst: 1) the preparation of mesoporous carbon: after washing and drying the bagasse, sieve the bagasse of 5-10 millimeters long, add 50wt% zinc chloride solution and impregnate 24h, after filtering, in 100 °C dried overnight at N 2 Microwave radiation under the atmosphere for 15 minutes (2.45GHz, 700W), then wash with 10wt% HCl solution and deionized water, the sample after drying is mesoporous carbon-2, wherein the most probable pore diameter of mesoporous carbon-2 is 3.4 nm, the pore size distribution is detailed in figure 1 Curve 2;

[0017] 2) Loading reaction of gold: take 0.57ml of chloroauric acid solution (17.59mgAu / ml), the...

Embodiment 3

[0019] Example 3: gold / mesoporous carbon-3 catalyst, 0.5M glucose solution, under the condition of 40 ℃, the conversion rate of glucose is 22%, the selectivity of gluconic acid is 99%, after the reaction is carried out continuously for 120 hours, the activity of the catalyst no attenuation

[0020] Preparation of gold / mesoporous carbon-3 catalyst: 1) Preparation of mesoporous carbon: 1,4-isophthalonitrile (1.00g, 7.8mmol) and zinc chloride (5.32g, 39.0mmol) were added to quartz Injection, then vacuumize the injection, seal, heat at 700°C for 20h, cool to room temperature, take out the reaction mixture, stir in HCl for 15h, filter, wash with water and tetrahydrofuran, and dry under vacuum at 150°C to obtain mesoporous Carbon-3, the most probable pore diameter of mesoporous carbon-3 is 5.2 nanometers, and its pore size distribution is detailed in figure 1 Curve 3;

[0021] 2) Loading reaction of gold: take 0.57ml of chloroauric acid solution (17.59mgAu / ml), then add 283ml of w...

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Abstract

The invention provides a method for preparing gluconic acid through a selective catalytic oxidation reaction by taking glucose as a raw material and gold/mesoporous carbon as a catalyst. Conditions are that: the catalyst is the carbon-loaded gold catalyst with a regular mesoporous structure, and the concentration of glucose is 0.01 to 2M; oxygen is used as an oxidant, and the velocity range of the oxygen is 100 to 1,000 ml.min<-1>; and the reaction temperature range of the glucose selective oxidation reaction is between 25 and 80 DEG C, reaction pressure is normal pressure and reaction time is 0.5 to 120h. In the invention, an action of the mesoporous carbon-loaded nano gold for the glucose selective catalytic oxidation is used, the glucose with a certain concentration is converted into the gluconic acid at normal temperature and normal pressure, so that energy consumption of the reaction process is low, the catalyst is stable and can be recycled and the method is a method for preparing the green gluconic acid.

Description

technical field [0001] The invention relates to the preparation of gluconic acid, in particular to a method for preparing gluconic acid by using gold / mesoporous carbon as a catalyst and glucose as a raw material to undergo a catalytic selective oxidation reaction at normal temperature and pressure. Background technique [0002] Gluconic acid is widely used in medicine, food and other industries due to its low corrosiveness, refreshing sour taste, non-volatile nature, and the ability to form water-soluble conjugates with certain divalent or trivalent metal ions. In the pharmaceutical industry, gluconic acid is used in the production of calcium gluconate, ferrous gluconate and other drugs, in the dairy industry to prevent milk stone precipitation, in food formulations as a sour agent, in industry as steel, aluminum, glass bottles Cleaning agent for fabric processing and metal processing, metal rust remover, plasticizer for concrete in the construction industry, biodegradable c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/105C07C51/235B01J23/52
Inventor 郝郑平麻春艳刑伟何炽薛雯娟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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