A kind of preparation method of high-quality cyanamide aqueous solution

A technology of cyanamide and aqueous solution, which is applied in the direction of cyanamide, etc., can solve the problems of reducing product quality, achieve the effect of improving product quality, cheap raw materials, improving overall quality and corporate brand competitiveness

Active Publication Date: 2019-11-15
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method uses carbon dioxide to control the pH value to about 7.5. Compared with the pH range of 4-5 with better stability, considerable dicyandiamide by-products will still be generated; in addition, there are a large amount of coke and other metals in the raw material lime nitrogen. Impurities such as oxides and nitrides are introduced into the product during the production of cyanamide, which reduces the quality of the product

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  • A kind of preparation method of high-quality cyanamide aqueous solution
  • A kind of preparation method of high-quality cyanamide aqueous solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of preparation method of high-quality cyanamide aqueous solution, comprises the following steps:

[0018] (1) Preparation of calcium cyanamide: mix calcium oxide and urea and grind to obtain a mixed powder with a particle size of 0.3 mm, then fully stir the mixed powder and superalloy chips, mix evenly, and place Calcined at 260°C for 3 hours under the protection of nitrogen, then raised the temperature to 650°C and continued to calcined for 1 hour. After the reaction was completed, it was cooled to room temperature under nitrogen atmosphere, and the obtained crude calcium cyanamide was ground with a pair of roller mills to obtain The fine particles with a particle size of 0.3mm are magnetically separated by a magnetic separator to remove superalloy debris, collect the fine particles and rinse the fine particles with clean water at 0°C for 3 times. Each rinsing time is 3 minutes. After rinsing, filter and collect the remaining sediment, and dry at 40°C to obtain ...

Embodiment 2

[0026] A kind of preparation method of high-quality cyanamide aqueous solution, comprises the following steps:

[0027] (1) Preparation of calcium cyanamide: mix calcium oxide with urea and grind to obtain a mixed powder with a particle size of 0.4 mm, then fully stir the mixed powder and superalloy chips, mix evenly, and place Calcined at 320°C for 4 hours under the protection of nitrogen, then raised the temperature to 750°C and continued to calcine for 2 hours. After the reaction was completed, it was cooled to room temperature under nitrogen atmosphere, and the obtained crude calcium cyanamide was ground with a pair of roller mills to obtain The fine particles with a particle size of 0.4mm are magnetically separated by a magnetic separator to remove superalloy debris, collect the fine particles and rinse the fine particles with 1°C water for 4 times. Each rinsing time is 4 minutes. After rinsing, filter and collect the remaining precipitate, and dry it at 50°C to obtain ca...

Embodiment 3

[0035] A kind of preparation method of high-quality cyanamide aqueous solution, comprises the following steps:

[0036] (1) Preparation of calcium cyanamide: mix calcium oxide with urea and grind to obtain a mixed powder with a particle size of 0.5 mm, then fully stir the mixed powder and superalloy chips, mix evenly, and place Calcined at 400°C for 5h under the protection of nitrogen, then raised the temperature to 850°C for 3h, cooled to room temperature under nitrogen atmosphere after the reaction, and ground the obtained crude calcium cyanamide with a roller mill to obtain The fine particles with a particle size of 0.5mm are magnetically separated by a magnetic separator to remove superalloy debris, collect the fine particles and rinse the fine particles with clean water at 3°C ​​for 5 times. Each rinsing time is 5 minutes. After rinsing, filter and collect the remaining sediment, and dry at 60°C to obtain calcium cyanamide for later use;

[0037] (2) Preparation of cyana...

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Abstract

The invention discloses a preparation method of a high-quality cyanamide water solution. The preparation method has the advantages that the calcium oxide is used as the raw material, is low in price,and is easy to obtain; the high-temperature alloy chips are mixed into the calcium oxide and urea powder, and are used as the bath salt, so that the heating effect of the powder at high temperature isimproved, the yield rate of calcium cyanamide is increased, and the high-temperature alloy chips are easy to recycle and reutilize; the crude powder of the calcium cyanamide is rinsed by cold water,so that the content of calcium oxide impurities in the crude product of calcium cyanamide is reduced; the pH (potential of hydrogen) value of a dissolving system is controlled by a phosphoric acid solution, so that the generation of the side reaction product of dicyandiamide is favorably inhibited, the purity of the cyandiamide is favorably improved, the quality of the product is improved, and thepositive meaning is realized on improvement of whole quality of cyandiamide industry and brand competitiveness of enterprise.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of high-quality cyanamide aqueous solution. Background technique [0002] The chemical name of cyanamide is cyanamide, also known as aminocarbonitrile, and the English name is Cyanamide. Cyanamide contains a cyano group and an amino group, both of which are active groups. They have the multiple reactivity of the above functional groups and are prone to addition and substitution. , condensation and other reactions. Cyanamide solution is widely used in medicine, pesticide, agriculture and other aspects. [0003] At present, the process mainly adopted by cyanamide solution is the lime nitrogen method. The specific operation method is: add lime nitrogen in batches under the flow of carbon dioxide in the water phase system, control the temperature and pH value during the process, and separate the cyanamide solution and Calcium carbonate sla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/18C01C3/16
CPCC01C3/16C01C3/18C01P2006/80
Inventor 马韵升张超梁万根于龙崔卫华高鹏安敬瑞
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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