Method for preparing aminoguanidin carbonate

A technology of aminoguanidine bicarbonate and ammonium bicarbonate, applied in the field of preparation of aminoguanidine bicarbonate, can solve the problems of complex process and high cost, and achieve the effects of simple process, low cost and easy control

Inactive Publication Date: 2009-03-11
HUBEI ZHICHENG CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a kind of preparation method of aminoguanidine bicarbonate aiming at the defects existi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 1500L tap water and 150kg hydrazine hydrate (content ≥ 80%) into a 3000L glass-lined reactor equipped with a PH meter online monitoring device, add 40% dilute sulfuric acid dropwise until the pH value is 5-6, and add 1kg sodium dihydrogen phosphate Stabilizer, put in lime nitrogen three times (the total amount of lime nitrogen is 360kg, the effective N content is ≥ 22%, and the lime nitrogen is 120kg each time), stir vigorously, use a flow meter to continuously drop dilute sulfuric acid at a constant speed, and the dropwise addition process , use circulating water to control the temperature at about 45°C, and add dropwise until the pH of the reaction solution is 7.2 to 7.8. After the dropwise addition, the temperature was raised, and the temperature was kept at 70° C. for 3 hours, and the pH of the reaction solution was kept at 7.2 to 7.8 during the heat preservation process. Infuse compressed air into the insulated reaction solution for 10 minutes, then filter the ...

Embodiment 2

[0026] Put 1500L tap water and 150kg hydrazine hydrate (content ≥ 80%) into a 3000L glass-lined reactor equipped with a PH meter online monitoring device, add 50% dilute sulfuric acid dropwise until the pH value is 5-6, and add 1kg disodium hydrogen phosphate Stabilizer, put in lime nitrogen three times (the total amount of lime nitrogen is 360kg, the effective N content is ≥ 22%, and the lime nitrogen is 120kg each time), stir vigorously, use a flow meter to continuously drop dilute sulfuric acid at a constant speed, and the dropwise addition process , use circulating water to control the temperature at about 40°C, and add dropwise until the pH of the reaction solution is 7.2 to 7.8. After the dropwise addition, the temperature was raised, and the temperature was kept at 70° C. for 3 hours, and the pH of the reaction solution was kept at 7.2 to 7.8 during the heat preservation process. Infuse compressed air into the insulated reaction solution for 10 minutes, then filter the ...

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PUM

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Abstract

The invention relates to a method for preparing a chemical product, in particular to a method for preparing aminoguanidine bicarbonate. Under the double action of decalcification and pH value adjustment of a dilute sulphuric acid, hydrazine hydrate and calcium cyanamide are added with a cyanamide stabilizer for one-step hydrazinolysis reaction to obtain aminoguanidine water solution, and then ammonium hydrogen carbonate is added into the aminoguanidine water solution to precipitate to produce the aminoguanidine bicarbonate. The method has the advantages of simple process, easy control, steady quality, and high yield.

Description

technical field [0001] The invention relates to a preparation method of chemical products, in particular to a preparation method of aminoguanidine bicarbonate. Background technique [0002] Aminoguanidine bicarbonate is an important chemical product, which is mainly used in the synthesis of dye industry cationic red 2BL and X-GRL. It is used in the synthesis of 5-amino-1,2,4-triazole 3-carboxylic acid, an intermediate of antiviral drug ribavirin, and also used in drugs such as tripidil, propiguanilhydrazone and pesticide fenfurene Synthesis of hydrazone, etc., its use is very extensive. [0003] There are three kinds of preparation methods of aminoguanidine bicarbonate through domestic and foreign literature reports and use: [0004] 1. Reducing nitroguanidine or nitrosoguanidine with zinc powder; [0005] 2. Hydrazinolysis of nitrosoguanidine or S-alkylthiourea; [0006] 3. The hydrazinolysis reaction of lime nitrogen with cyanamide, hydrazine hydrate and hydrazine salt...

Claims

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Application Information

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IPC IPC(8): C07C281/16
Inventor 张闰扬
Owner HUBEI ZHICHENG CHEM TECH
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