Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of method that palladium catalyst catalyzes oxidation glucose to make gluconic acid and salt

A technology of catalytic oxidation and sodium gluconate, which is applied in the field of palladium catalyst catalytic oxidation of glucose to produce gluconic acid and salt, which can solve the problems of catalyst deactivation and low production efficiency

Active Publication Date: 2021-04-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heterogeneous catalysis method has the advantages of short cycle, simple operation, easy separation of products, and recyclable catalyst, but the currently used Pd / C catalyst has disadvantages such as easy deactivation of the catalyst and low production efficiency.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of method that palladium catalyst catalyzes oxidation glucose to make gluconic acid and salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Catalyst preparation: Pd / AC, Pd-Bi / AC and other catalysts are prepared by an equal-volume impregnation method. The palladium loading in the catalyst is 0.5%-5%, and the Bi content is 1%-20%.

Embodiment 2

[0013] Catalytic conversion experiment: Pd / AC prepared in Example 1 was used as a catalyst. The mass concentration of glucose is 5%, the molar ratio of glucose and Pd is 1000:1, oxygen is continuously introduced under stirring conditions, and the reaction temperature is kept at 60°C. During the reaction, 1mol / L NaOH solution is continuously added dropwise by a pH titrator, The pH of the solution was maintained at 9.5. Constant temperature reaction until the pH of the reaction system does not change, the reaction ends. Stand still after the reaction, wash and precipitate the catalyst for future use.

[0014] Table 1 Catalytic Reactivity of Pd / AC Catalyst in Glucose Catalytic Oxidation: Reaction Time 60min

[0015] catalyst Glucose conversion rate% Sodium gluconate selectivity% other% 0.5%Pd / AC 68 96 4 1%Pd / AC 79 98.7 1.3 2%Pd / AC 87 99.0 1.0 3%Pd / AC 100 99.4 0.6 4%Pd / AC 97 97.8 2.2 5%Pd / AC 88 98.1 1.9

Embodiment 3

[0017] Catalytic conversion experiment: 3% Pd-Bi / AC prepared in Example 1 was used as a catalyst, wherein the contents of bismuth were respectively 1%, 3%, 5%, 7%, 10%, and 15%, and the glucose oxidation reaction was carried out. The concentration of glucose is 5%, the molar ratio of glucose and Pd is 1000:1, oxygen is continuously introduced under stirring conditions, and the reaction temperature is kept at 60°C. During the reaction, 1mol / L NaOH solution is continuously added dropwise by a pH titrator to keep The pH of the solution = 9.5. Constant temperature reaction until the pH of the reaction system does not change, the reaction ends. Stand still after the reaction, wash and precipitate the catalyst for future use.

[0018] The impact of table two loading on glucose oxidation reaction activity: reaction time 60min

[0019] catalyst Glucose conversion rate% Sodium gluconate selectivity% other% 3%Pd / AC 100 99.4 0.6 3%Pd-1%Bi / AC 100 99.7 0.3...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for preparing gluconic acid and salts by catalytic oxidation of glucose with a supported palladium catalyst. The catalyst is a palladium catalyst supported by a carrier such as activated carbon and metal oxides. In the method, in the process of catalyzing the oxidation of glucose by nano-palladium, by adding a small amount of H 2 O 2 , tert-butyl hydroperoxide (TBHP), cumene hydroperoxide (CHPO) and other initiators, greatly improve the efficiency of the glucose oxidation reaction and reduce the amount of catalyst. The catalytic reaction conditions are as follows: the concentration of the glucose solution is 1%-30%, the molar ratio of the glucose to the gold catalyst is 200-10000, the reaction temperature is 30-80 DEG C, and oxygen or air is used as the oxidant. The initiator added in the reaction has the advantages of small amount, non-toxicity, low price, etc., and has a very broad industrial application prospect.

Description

technical field [0001] The invention relates to a method for preparing gluconic acid and salts by catalyzing and oxidizing glucose with a palladium catalyst. Background technique [0002] Gluconic acid and its salts, such as sodium gluconate, calcium gluconate, etc., are a class of important chemical, pharmaceutical and food raw materials and intermediates. Gluconic acid can be used in the dairy industry to prevent milk stone precipitation; as a sour agent in food formulations; and can be used in cleaning agents, fabric processing and metal processing additives, secondary oil recovery anti-sedimentation agents, etc. The metal ion salts made of gluconic acid and sodium, calcium, zinc, ferrous iron are widely used in chemical industry, food, medicine, light industry and other industries. Sodium gluconate is used as an excellent chelating agent in water treatment, electroplating and other departments; calcium gluconate, zinc, ferrous, magnesium, etc. are used in the food indus...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/235C07C59/105B01J23/44B01J23/644
CPCB01J23/44B01J23/6447C07C51/235C07C59/105
Inventor 黄家辉张军营洪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI