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Method for directly producing guanidine nitrate by using liquid ammonia and dilute nitric acid

A technology of dilute nitric acid and guanidine nitrate, applied in chemical instruments and methods, preparation of ammonia compounds and organic compounds, etc., can solve problems such as danger, achieve novel synthesis methods, and reduce the transportation and storage risks of nitric acid.

Pending Publication Date: 2022-03-01
宁夏贝利特生物科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. Hazardous characteristics

Method used

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  • Method for directly producing guanidine nitrate by using liquid ammonia and dilute nitric acid
  • Method for directly producing guanidine nitrate by using liquid ammonia and dilute nitric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] After 135g of liquid ammonia is vaporized, 875g of dilute nitric acid (60% by mass) is added in the thermos reaction flask, the reaction is exothermic, and the temperature is at 70°C. After removing the generated water vapor, gradually add 340g of dicyandiamide to the reaction flask Amine, keep the system in a molten state until the addition of dicyandiamide is complete. The system reacts exothermicly, and the temperature rises. When the temperature rises to 230°C, keep it warm for 10 minutes and discharge it into the cooling pan, cool, weigh, and analyze. Obtain product 1000g, guanidine nitrate content 92.4%.

Embodiment 2

[0057]After 142g of liquid ammonia was vaporized, 875g of dilute nitric acid (mass fraction 60%) was added in the thermos reaction flask, the reaction was exothermic, and the temperature was at 150°C. After the generated water vapor was removed, 330g of dicyandiamide was gradually added to the reaction flask Amine, keep the system in a molten state until the addition of dicyandiamide is complete. The system reacts exothermicly, and the temperature rises. When the temperature rises to 220°C, keep it warm for 10 minutes and discharge it into a cooling pan, cool, weigh, and analyze. Obtain product 989g, guanidine nitrate content 92.2%.

Embodiment 3

[0059] After 152g of liquid ammonia was vaporized, 875g of dilute nitric acid (60% by mass) was added to the thermos reaction flask, the reaction was exothermic, and the temperature was at 120°C. After the generated water vapor was removed, 350g of dicyandiamide was gradually added to the reaction flask Amine, keep the system in a molten state until the addition of dicyandiamide is complete. The system reacts exothermicly, and the temperature rises. When the temperature rises to 200°C, keep it warm for 10 minutes and discharge it into the cooling pan, cool, weigh, and analyze. Obtain product 1004g, guanidine nitrate content 92.2%.

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Abstract

The invention discloses a method for directly producing guanidine nitrate by using liquid ammonia and dilute nitric acid, which comprises the following steps: gasifying the liquid ammonia into ammonia gas, introducing the ammonia gas into the dilute nitric acid, reacting to generate ammonium nitrate, adding dicyandiamide into the ammonium nitrate, melting, preserving heat, discharging, and slicing to obtain the guanidine nitrate. According to the method, gasified liquid ammonia and dilute nitric acid react to synthesize ammonium nitrate, water can be brought out through an exothermic reaction, then ammonium nitrate and dicyandiamide react to generate guanidine nitrate, and the synthesis method is novel and has great significance in safety, environmental protection and continuous and automatic development in guanidine nitrate production.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for directly producing guanidine nitrate by using liquid ammonia and dilute nitric acid. Background technique [0002] Guanidine nitrate is an important pharmaceutical intermediate with the molecular formula CH 5 N 3 ·HNO 3 , molecular weight 122.08. It is a white granular solid. Guanidine nitrate is soluble in water and alcohol, but insoluble in acetone, benzene and ether. It is mainly used in the synthesis of sulfa drugs such as sulfamidine, and is also used as a raw material for the manufacture of explosives, photographic materials, and disinfectants. It can also be used as an analytical reagent to test guanidine salts in complex acids. Oxidizing and toxic. Decomposes and explodes at high temperatures. Main application: It is a new material for automobile airbags, used in the synthesis of pharmaceutical intermediates such as sulfadiazine, rocket pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C277/02
CPCC07C277/02C01C1/185
Inventor 姬越城赵黎明李小露王伟
Owner 宁夏贝利特生物科技有限公司