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Continuous synthesis process of guanidine nitrate

A technology of guanidine nitrate and chemical synthesis, which is applied in the field of chemical industry, can solve problems such as unstable product quality and yield, damage to raw material ratio, and difficulty in reaction control, and achieve the effects of reduced operating intensity, stable operation, and high yield

Active Publication Date: 2013-12-18
NANTONG TENDENCI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic manufacturers all adopt the batch reaction process, and the raw materials are put in at one time. After the heating reaction, due to the obvious thermal effect, the reaction control is difficult. The diguanidine nitrate (guanidine amidino nitrate) produced in the reaction process is a strong base, causing the ammonium nitrate to decompose and release NH3 is released, destroying the ratio of raw materials, and the quality and yield of products are unstable

Method used

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  • Continuous synthesis process of guanidine nitrate
  • Continuous synthesis process of guanidine nitrate
  • Continuous synthesis process of guanidine nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a melting kettle equipped with a thermometer, stirring, and a 500 ml feeding funnel, add 288 g of ammonium nitrate (3.6 mol) and 151.2 g of dicyandiamide (1.8 mol) respectively, start heating and melting at 120 ° C, and continue to heat up to 130 ° C , and the continuous reaction was started after holding for half an hour. In the reaction process, the feeding speed is controlled by two small screw feeders, and the raw materials are added to the melting kettle stably and evenly. The speed of adding dicyandiamide is 150g / h, and the speed of ammonium nitrate is 300g / h. The temperature is 130 ± 5 degrees, the average residence time is 1 hour, and the melted material overflows into the 500ml first-level reactor from the opening on the side of the melting kettle, and the temperature of the control first-level reactor is 180 ± 5 degrees, and the average residence time is 1 hour. , the speed of feeding ammonia is 15g / h, and the reacted material overflows from the opening on ...

Embodiment 2

[0035] In a melting kettle equipped with a thermometer, stirring, and a 500 ml feeding funnel, add 288 g of ammonium nitrate (3.6 mol) and 151.2 g of dicyandiamide (1.8 mol) respectively, start heating and melting at 120 ° C, and continue to heat up to 130 ° C , and the continuous reaction was started after holding for half an hour. In the reaction process, the feeding speed is controlled by two small screw feeders, and the raw materials are added to the melting kettle stably and evenly. The speed of adding dicyandiamide is 200g / h, and the speed of ammonium nitrate is 400g / h. The temperature is 130 ± 5 degrees, the average residence time is 1 hour, and the melted material overflows into the 500ml first-level reactor from the opening on the side of the melting kettle, and the temperature of the control first-level reactor is 180 ± 5 degrees, and the average residence time is 1 hour. , the speed of feeding ammonia is 15g / h, and the reacted material overflows from the opening on ...

Embodiment 3

[0037] In a melting kettle equipped with a thermometer, stirring, and a 500 ml feeding funnel, add 288 g of ammonium nitrate (3.6 mol) and 151.2 g of dicyandiamide (1.8 mol) respectively, start heating and melting at 120 ° C, and continue to heat up to 130 ° C , and the continuous reaction was started after holding for half an hour. In the reaction process, the feeding speed is controlled by two small screw feeders, and the raw materials are smoothly and evenly added into the melting kettle. The speed of adding dicyandiamide is 100g / h, and the speed of ammonium nitrate is 200g / h. The temperature is 130 ± 5 degrees, the average residence time is 1 hour, and the melted material overflows into the 500ml first-level reactor from the opening on the side of the melting kettle, and the temperature of the control first-level reactor is 180 ± 5 degrees, and the average residence time is 1 hour. , the speed of feeding ammonia gas is 7.5g / h, and the reacted material overflows from the op...

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Abstract

The invention discloses a continuous synthesis process of guanidine nitrate. The method comprises the following steps: (1), continuously adding materials into a melting kettle according to a proportion, controlling the temperature of the melting kettle, overflowing the materials to enter a primary reaction kettle after the materials are molten; (2), controlling the temperature and the retention time of the primary reaction kettle, continuously ventilating an ammonia gas into the primary reaction kettle, and overflowing the reacted materials to enter a secondary reaction kettle; and (3), controlling the temperature and the retention time of the secondary reaction kettle, continuously ventilating the ammonia gas into the secondary reaction kettle, and cooling, slicing and packaging the reacted materials to obtain a guanidine nitrate finished product. The synthesis process disclosed by the invention is continuously carried out for the whole process and stable to operate, so that the operation strength is greatly lowered, the product yield is high, the quality is good and the yield is high.

Description

technical field [0001] The invention relates to a preparation method of guanidine nitrate, in particular to a continuous synthesis process of guanidine nitrate, which belongs to the technical field of chemical industry. Background technique [0002] Guanidine nitrate is a widely used chemical raw material. It is white crystalline powder or granules, easily soluble in water and alcohol, and has irritating effects on eyes, skin, mucous membranes and upper respiratory tract. Guanidine nitrate is a raw material for the production of sulfa drugs such as sulfamidine and sulfadiazine, and explosives such as nitroguanidine. It is also used in the production of guanidine carbonate and other guanidine salts, as well as in the paint industry, photographic materials and disinfectants. Due to the low light and heat emitted by guanidine nitrate, it has its special value as propellant powder. [0003] The preparation method of guanidine nitrate varies from country to country, mainly inclu...

Claims

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Application Information

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IPC IPC(8): C07C279/02C07C277/02
Inventor 黄辉张烨方坤钰周书平
Owner NANTONG TENDENCI CHEM
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