Method for efficiently preparing monocyanamide solution

A cyanamide solution technology, which is applied in the field of preparation of cyanamide solution, can solve problems such as high carbon dioxide concentration requirements, incomplete filtration of cyanamide waste residue, and high calcium ion content, so as to shorten the production cycle, shorten the hydrolysis time, and reduce the The effect of calcium content

Inactive Publication Date: 2015-03-25
GULANG XINHUI CHEM
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Problems solved by technology

[0004] The purpose of this invention is to provide a kind of method for efficiently preparing cyanamide solution, to solve the equipment investment that exists in the existing 50% cyanamide solution production process, energy consumption is high, production cycle is long, production cost height, carbon dioxide concentration High requirements, high calcium ion content, and incomplete filtration of cyanamide waste residue

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  • Method for efficiently preparing monocyanamide solution

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Effect test

Embodiment 1

[0029] (1) Hydrolysis and decalcification process: Start the vacuum pump, add 1230kg of water into the hydrolysis kettle, and open the kiln gas inlet valve of the hydrolysis kettle to observe the kiln gas bubbling. The mass content of carbon dioxide in the kiln gas is 31%. Put lime nitrogen into the silo through the bucket elevator; open the screw feeder to put 300kg of lime nitrogen (20.5% nitrogen) into the hydrolysis kettle in batches, the feeding temperature of lime nitrogen is 15°C, and the feeding speed is controlled at 8kg / min. The reaction temperature is 20°C, continue to pass the kiln gas until the pH value of the system is 7, the lime nitrogen feeding is completed, and the kiln gas is fed for another 10 minutes before stopping, and then the reaction solution is put into the suction filter tank for microporous filtration to obtain 692kg Cyanamide crude solution and black slag; filtered cyanamide aqueous solution enters the storage tank, and the black slag is washed wit...

Embodiment 2

[0033] (1) Hydrolysis and decalcification process: Start the vacuum pump, add 1800kg of water into the hydrolysis kettle, and open the kiln gas inlet valve of the hydrolysis kettle to observe the kiln gas bubbling. The mass content of carbon dioxide in the kiln gas is 30%. Put the lime nitrogen into the silo through the bucket elevator; open the screw feeder to put 300kg of lime nitrogen (21% nitrogen) into the hydrolysis kettle in batches, the feeding temperature of lime nitrogen is 20°C, and the feeding speed is controlled at 9kg / min. The reaction temperature is 30°C, continue to pass the kiln gas until the pH value of the system is 7, the lime nitrogen feeding is completed, and the kiln gas is passed in for another 10 minutes before stopping, and then the reaction solution is put into the suction filter tank for microporous filtration to obtain 845g Cyanamide crude solution and black slag; filtered cyanamide aqueous solution enters the storage tank, and the black slag is was...

Embodiment 3

[0037] (1) Hydrolysis decalcification process: Start the vacuum pump, add 1500kg of water into the hydrolysis kettle, and open the kiln gas inlet valve of the hydrolysis kettle to observe the kiln gas bubbling. The mass content of carbon dioxide in the kiln gas is 32%, and the lime nitrogen point bag is measured Finally, put lime nitrogen into the silo through the bucket elevator; open the screw feeder and put 300kg of lime nitrogen (21% nitrogen) into the hydrolysis kettle in batches, the feeding temperature of lime nitrogen is 10°C, and the feeding speed is controlled at 10kg / min , the reaction temperature is 40°C, continue to pass the kiln gas until the pH value of the system is 8 o'clock, the lime nitrogen feeding is completed, the kiln gas is passed in for another 10 minutes and then stopped, and then the reaction solution is put into the suction filter tank for microporous filtration to obtain 844kg cyanamide crude solution and black residue; the filtered cyanamide aqueou...

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Abstract

The invention discloses a method for efficiently preparing a monocyanamide solution, and is used for solving the problems of high equipment investment, high energy consumption, long production period, high production cost, high requirement on concentration of carbon dioxide, high content of calcium ions and incomplete filtration of cyanamide waste residue of an existing production process of the 50% monocyanamide solution. The method comprises the steps of performing a hydrolytic decalcification process step, adding phosphoric acid to regulate pH value, and performing microporous filtration, and evaporation concentration to obtain a monocyanamide product. The monocyanamide solution is prepared by improving a gas inlet way of kiln gas and applying a microporous filtration method, an ion exchange resin decalcification technology and a rotary thin film scraper steam method. Compared with a domestic traditional process, by adopting the method, the requirement of the traditional process on the concentration of carbon dioxide is reduced, the content of the calcium ions in the monocyanamide product is strictly controlled, the product quality is improved, the production period is shortened, the energy consumption is reduced, and the production cost is reduced, so that the method is suitable for industrial large-scale production and has good social and economic benefits.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of cyanamide solution. Background technique [0002] The scientific name of cyanamide is cyanamide, referred to as cyanamide. The crystal cyanamide is unstable, diamond-shaped, colorless, and prone to moisture. The melting point is 46°C. From 0°C to 30°C, the heat capacity value is 2.29kJ / kg·°C. Cyanamide has high solubility in water and is weakly alkaline, and it is completely miscible with water at 43°C. Cyanamide contains cyano and amino groups, both of which are active groups. With the multiple reactivity of the above functional groups, it is easy to undergo reactions such as addition, substitution, and condensation. [0003] Cyanamide is mainly used in the synthesis of medicines, health care products, feed additives and pesticide intermediates. Excessive calcium ions in cyanamide will affect product quality and seriously affect the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/16
CPCC01C3/16
Inventor 闫吉超李守博张士林
Owner GULANG XINHUI CHEM
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