Superfine silver powder and calcium pyruvate joint production method

A joint production technology of calcium pyruvate, applied in carboxylate preparation, organic chemistry, etc., can solve the problems of troublesome treatment process, high cost of hydroquinone, large feeding ratio of reducing agent, etc., achieve safety and environmental protection in the production process, and reduce waste The effect of material production and production cost reduction

Inactive Publication Date: 2014-10-15
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The deficiencies in the preparation of reducing agents from fine silver powder include: (1) The reducing agents hydrazine hydrate, formaldehyde and hydroquinone are poisonous, highly irritating, and have serious environmental and safety problems; (2) The cost of reducing agents sodium borohydride and hydroquinone is too high , affecting the production efficiency of silver powder; (3) The reducing agent ascorbic acid is sensitive to changes in the acidity, concentration and temperature of the reducing system, and the production conditions are not easy to control; (4) Most reducing agents need to be us...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 12.6g 40% industrial methylglyoxal (0.07mol) was diluted with 60mL deionized water into a concentration of 1.0mol / L methylglyoxal solution; 5.9 g chemically pure sodium hydroxide (0.14mol) was dissolved in 134mL deionized water to obtain 1.0mol / L sodium hydroxide solution; dissolve 17.0g silver nitrate reagent (0.1mol) in 80mL deionized water, and dilute to obtain 100mL 1.0mol / L silver nitrate solution.

[0042] Add aceglyoxal solution, sodium hydroxide solution and silver nitrate solution dropwise into a stirred 500mL glass reactor at the same time, black silver crystal nuclei are formed immediately, stop feeding for 10 minutes, when the precipitate gradually turns gray and white, continue to add For the raw material solution, the dropping rate is controlled to keep the precipitate generated in the reaction solution gray, maintain the pH of the reaction solution at 10-11 and the reaction temperature at 25-30° C., and the addition is completed in about 30 minutes. Afte...

Embodiment 2

[0047] Dilute 10.8g of 40% industrial methylglyoxal (0.06mol) with 50mL of deionized water, add 0.1g of oleic acid dispersant to obtain a solution of methylglyoxal with a concentration of 1.0mol / L containing dispersant; oxidize 5.1 g of chemically pure hydrogen Dissolve sodium (0.12mol) in 115mL deionized water to obtain a 1.0mol / L sodium hydroxide solution; dissolve 17.0g silver nitrate reagent (0.1mol) in 80mL deionized water and dilute to obtain 100mL 1.0mol / L silver nitrate solution .

[0048] Add aceglyoxal solution, sodium hydroxide solution and silver nitrate solution dropwise into a stirred 500mL glass reactor at the same time, black silver crystal nuclei are formed immediately, stop feeding for 5 minutes, when the precipitate gradually turns gray, continue to add For the raw material solution, the dropping rate is controlled to keep the precipitate formed in the reaction solution as off-white, and the pH of the reaction solution is maintained at 9-10 and the reactio...

Embodiment 3

[0051] Dilute 9.0g 40% industrial aceglyoxal (0.05mol) with 50mL deionized water, add 0.05g sodium dodecylsulfonate dispersant to obtain a dispersant-containing concentration of 1.0mol / L methylglyoxal solution; 5.1 g chemically pure sodium hydroxide (0.12mol) was dissolved in 115mL deionized water to obtain a 1.0mol / L sodium hydroxide solution; 17.0g silver nitrate reagent (0.1mol) was dissolved in 80mL deionized water and diluted to obtain 100mL 1.0mol / L silver nitrate solution.

[0052] Add aceglyoxal solution, sodium hydroxide solution and silver nitrate solution dropwise to the 500mL glass reactor with stirring at the same time, the dropping rate is controlled to keep the precipitate generated in the reaction solution as off-white, and maintain the pH of the reaction solution at 10-11 and the reaction temperature 25-30°C, the addition was completed in about 20 minutes. After the feeding is completed, raise the temperature to 40-50°C, and continue to stir and react for 0....

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Abstract

The invention discloses a clean production method for oxidizing methylglyoxal under the alkaline condition by using silver nitrate and meanwhile preparing superfine silver powder and calcium pyruvate. A silver nitrate solution, a sodium hydroxide solution and a methylglyoxal solution are added in a reactor in a parallel flow mode, a superfine silver powder and calcium pyruvate solution is generated through redox reaction, the reaction solution temperature is kept to be 20-30 DEG C, the reaction is performed for 0.5-1 hours under the condition of pH9-11, and the then the temperature is improved to be 40-50 DEG C to enable the reaction to be complete. Superfine silver powder is filtered, a calcium acetate solution is added after filter liquor vacuum concentration, and the calcium pyruvate generated through filtering and separation precipitates and is washed and dried to obtain calcium pyruvate crystal meeting the medical quality standard. The superfine silver powder pressured by the method can serve as a raw material of conductive silver paste of solar cells or electronic touch screens, and a calcium pyruvate product can serve as a weight loss nutritional agent. Two types of practical fine chemical engineering products can be simultaneously prepared by adopting the method, the raw material is fully utilized, waste is decreased, the production cost is reduced, and the technological process is safe and environment-friendly.

Description

technical field [0001] The invention relates to a joint production method of ultrafine silver powder and calcium pyruvate, in particular a clean production method for simultaneously producing ultrafine silver powder and calcium pyruvate by using silver nitrate to oxidize aceguvaldehyde under alkaline conditions, which can improve raw material utilization and The reduction of waste generation belongs to the fields of new chemical materials and environmental protection. Background technique [0002] Pyruvate and its salts are an important class of organic chemical intermediates, widely used in the organic synthesis industry. Pyruvate is used to synthesize various amino acids, such as L-tryptophan, L-leucine, L-cysteine, and is also an important raw material for the synthesis of vitamin B6 and B12, the preparation of hydrogenated atropine acid and the synthesis of ethylene polymers. In agriculture, it can be used to produce fungicides and herbicides, and can also be used as a ...

Claims

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Application Information

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IPC IPC(8): B22F9/24C07C51/41C07C59/19
Inventor 李建生李无为刘炳光
Owner TIANJIN VOCATIONAL INST
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