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Catalyst for producing gluconic acid sodium salt, method of preparing the same and applications

A sodium gluconate and catalyst technology, applied in the field of chemical building materials, can solve the problems of low product cost performance, difficult separation of products, large amount of catalyst, etc., and achieve the effects of less by-products, improved reaction selectivity, and good reactivity

Inactive Publication Date: 2008-08-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In industrial production, palladium / carbon catalysis-sodium hydroxide oxidation method is generally used to produce sodium gluconate at home and abroad. This method has the characteristics of simple process, mild reaction conditions, relatively short reaction time and high conversion rate, but there is a catalyst consumption. Large and easy to decrease activity, many side reactions, difficult to separate products and other shortcomings, resulting in lower cost performance of the product, so it is necessary to explore the preparation method of sodium gluconate

Method used

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  • Catalyst for producing gluconic acid sodium salt, method of preparing the same and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the preparation of composite catalyst

[0029] 1. Add 50ml of water to 45g of dry activated carbon (particle size 200 mesh) to suspend the activated carbon in water.

[0030] 2. 2.54g of nickel oxide (containing 2 grams of nickel) is dissolved in 9.9ml of 25% hydrochloric acid, and 7 grams of chloroplatinic acid solution (mass concentration is 30%, containing 1 gram of platinum) and 18.8 grams of Chloropaladic acid solution (mass concentration is 25%, containing 2 grams of palladium), stirred evenly.

[0031] 3. Mix the above suspensions and solutions, heat up to 75° C., add 30.7 grams of 15% NaOH solution (containing 4.6 grams of NaOH) to make the suspension alkaline and have a pH of 10.

[0032] 4. Stir at 75° C. for half an hour, add 10.19 ml of 37% formaldehyde solution to reduce platinum, palladium and nickel compounds.

[0033] 5, filter, wash, make the composite catalyst A of activated carbon supported platinum, palladium, nickel, wherein contain ...

Embodiment 2

[0034] Embodiment 2: the preparation of other several catalysts

[0035] Catalysts were prepared under the same conditions as in Example 1, except that the types and weight percentages of the catalyst components were changed to prepare catalysts B, C, D, E, F, and G respectively. The catalyst composition is shown in Table 1.

[0036] Table 1 Catalyst Composition

[0037] catalyst

Embodiment 3

[0038] Embodiment 3: Glucose oxidation synthesis sodium gluconate

[0039] Add 18 grams of glucose in a 250ml four-necked flask, then add 12ml of water, stir and dissolve to obtain a glucose solution with a concentration of 60%, to which 0.36 grams of catalyst A prepared in Example 1 and Example 2 are added (catalyst and glucose mass ratio is 2:100), the reaction solution was stirred and heated to 50°C, at this time, oxygen was introduced, and NaOH solution (concentration was 15%) was added dropwise during the reaction to keep the reaction solution alkaline (pH was 8-10) , heat preservation reaction for 3 hours. After the reaction, filter the catalyst, concentrate and crystallize to obtain sodium gluconate. Repeat the above operation, just change catalyst A to catalyst B, C, D, E, F, G respectively. The catalyst reaction evaluation results are shown in Table 2.

[0040] The yield is determined by measuring the residual sugar content in the reaction system by high-pressure l...

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Abstract

The invention relates to a catalyst for preparing sodium gluconate and preparation method and application thereof, which belongs to a chemical material field. The catalyst contains in mass percent: activated carbon 87-99% and mixture of Pt, Pd and Ni 1-13%, wherein the content of Pt, Pd and Ni are respectively 0.1-8%, 0.1-10%, and 0.1-5%. Compared with the prior art, the method for preparation sodium gluconate by using the catalyst is simple and the products are easily separated. The catalyst has the advantages of high catalyst selectivity, relatively low content of byproduct, long service life, low cost and wide industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method and an application of a catalyst for preparing sodium gluconate, which uses a composite catalyst to catalyze the oxidation of glucose to synthesize sodium gluconate, and belongs to the field of chemical building materials. Background technique [0002] Sodium gluconate is a deep-processing product of glucose, and is the basic raw material for the preparation of gluconolactone, gluconate (copper, zinc, ferrous salt), etc. It is widely used in food, light industry, Chemical, pharmaceutical and other industrial sectors. It can be used as a nutritional supplement, curing agent, buffering agent, etc. in the food industry. It can be used in electroplating, metal and non-metal surface cleaning, etc. in the light industry. It is mainly used as a retarder in the cement industry. It is a concrete admixture. important component. Overall, sodium gluconate has broad market prospects and application space. [0003] At...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J21/18C07C59/105C07C51/245
Inventor 耿飞解建光高培伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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