Synthesis technique of chromium propionate

A synthesis process, the technology of chromium propionate, is applied in the preparation of carboxylate, organic chemistry, etc., can solve the problems of technical pollution, high cost of industrialized production, complicated production process, etc., and achieves simple process route, simple operation, and easy availability of raw materials. Effect

Inactive Publication Date: 2012-02-15
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problems to be solved by the present invention are the problems of serious pollution, complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Synthesis of Chromium Hydroxide

[0015] Measure 50 mL of chromium sulfate solution with a mass fraction of 40%, slowly add 160 mL of NaOH solution with a mass concentration not higher than 10%, stir while adding, filter, wash with deionized water 2 to 3 times, and dry to obtain a gray-green solid ,stand-by.

[0016] 2. Synthesis of Chromium Propionate

[0017] Weigh 5.0 g of chromium hydroxide, put it into a 50 mL flask, add 7.2 mL of propionic acid, and heat under reflux at 100°C in an oil bath for 1 h with stirring. Filter to remove insoluble matter, and concentrate to a thick paste to obtain crude chromium propionate for use.

[0018] 3. The refining of chromium propionate includes the following steps

[0019] Add 1 mL of absolute ethanol to the crude chromium propionate to fully dissolve it, filter, concentrate the filtrate to a thick paste, put it in a vacuum oven and dry at 50°C for 8 hours to obtain a green solid with a yield of 92.4%.

Embodiment 2

[0021] 1. Synthesis of Chromium Hydroxide

[0022] Weigh 24.0 g of chromium chloride hexahydrate, slowly add 160 mL of NaOH solution with a mass concentration not higher than 10%, stir while adding, filter, wash with deionized water 2 to 3 times, and dry to obtain a light green solid, which is ready for use .

[0023] 2. Synthesis of Chromium Propionate

[0024] Weigh 5.0 g of chromium hydroxide, put it into a 50 mL flask, add 7.2 mL of propionic acid, and heat under reflux at 100°C in an oil bath for 3 h with stirring. Filter to remove insoluble matter, and concentrate to a thick paste to obtain crude chromium propionate for use.

[0025] 3. Refining of chromium propionate

[0026] Add 1 mL of absolute ethanol to the crude chromium propionate to fully dissolve it, filter, concentrate the filtrate to a thick paste, put it in a vacuum drying oven at 50°C for 8 hours, and obtain a green solid with a yield of 93.2%.

Embodiment 3

[0028] 1. Synthesis of Chromium Hydroxide

[0029] Weigh 40.0 g of chromium nitrate nonahydrate, slowly add 160 mL of NaOH solution with a mass concentration not higher than 10%, stir while adding, filter, wash with deionized water 2 to 3 times, and dry to obtain a light green solid, which is ready for use.

[0030] 2. Synthesis of Chromium Propionate

[0031] Weigh 5.0g of chromium hydroxide, put it into a 50mL flask, add 7.2mL of propionic acid, heat under reflux at 130°C in an oil bath for 1h with stirring. Filter to remove insoluble matter, and concentrate to a thick paste to obtain crude chromium propionate.

[0032] 3. Refining of chromium propionate

[0033] Add 1 mL of absolute ethanol to the crude chromium propionate to fully dissolve it, filter, concentrate the filtrate to a thick paste, put it in a vacuum drying oven at 50°C for 8 hours, and obtain a green solid with a yield of 93.6%.

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Abstract

The invention relates to a synthesis technique of chromium propionate, which comprises the steps of synthesis of chromic hydroxide, synthesis of chromium propionate and refinement. The invention has the advantages of simple technical line, accessible raw materials and high yield, is simple to operate, and is suitable for industrial production; and the product is free of virulent sexavalent chrome.

Description

technical field [0001] The invention relates to a synthesis process of chromium propionate. technical background [0002] The synthesis technique of chromium propionate mainly contains the following several at present: [0003] 1. With potassium dichromate, propionic acid, glucose as raw material, the batching ratio is: potassium dichromate: propionic acid=1: 6 (molar ratio), potassium dichromate: glucose=5.8: 1 (mass ratio), React at 120-135°C for 3h. [0004] 2. Using potassium dichromate, propionic acid, and propylene glycol as raw materials, the ingredient ratio is: potassium dichromate: propionic acid: propylene glycol = 116.58: 499.73: 33.55 (mass ratio), and react at 120-135 ° C for 3 hours. [0005] 3. With potassium dichromate, propionic acid, water, sodium nitrite as raw materials, the batching ratio is: potassium dichromate: propionic acid: water: sodium nitrite=22.05: 140: 60: 16.05 (mass ratio), in React at 10-16°C for 2h. [0006] The yields of these three ...

Claims

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Application Information

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IPC IPC(8): C07C53/122C07C51/41
Inventor 王立升周中杰蒋敏捷段曼殷勇
Owner GUANGXI UNIV
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