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Method for increasing hydrogen cyanamide yield by utilizing ultrasonic dispersion device

A technology of ultrasonic dispersion and cyanamide, applied in directions such as cyanamide, can solve the problems of increasing production unit consumption and cost, waste of active ingredients, inconsistency with atomic economy, etc., to improve purity and yield, and improve gas-liquid contact. area, the effect of improving the conversion utilization rate

Active Publication Date: 2018-11-27
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The active ingredient content in the cyanamide slag that this method produces can reach more than 0.3%, has caused the waste of active ingredient, also does not conform to atom economy, has improved production unit consumption and cost; How to improve the utilization rate of raw material becomes the prior art One of the urgent problems to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of method utilizing ultrasonic dispersing device to improve cyanamide yield, comprises the following steps:

[0019] (1) Preparation of calcium cyanamide: After the calcium carbide is crushed, it is evenly mixed with fluorite and calcium oxide, and it is ground into powder by a ball mill, and then the powder is added to the nitriding furnace, and pure nitrogen gas is blown into the nitriding furnace, and the nitriding furnace is After the furnace is heated to 1000°C, it starts to react with nitrogen, and the reaction lasts for 42 hours. During the reaction, an ultrasonic disperser is used to disperse the molten material, every 3 hours, and the duration of a single dispersion is 20 minutes. The nitriding furnace is in a nitrogen environment After cooling down naturally, take out the frit and crush it finely through a tube mill, and set aside;

[0020] (2) Preparation of cyanamide solution: feed carbon dioxide gas into clear water to control the pH value of the sol...

Embodiment 2

[0028] A kind of method utilizing ultrasonic dispersing device to improve cyanamide yield, comprises the following steps:

[0029] (1) Preparation of calcium cyanamide: After the calcium carbide is crushed, it is evenly mixed with fluorite and calcium oxide, and it is ground into powder by a ball mill, and then the powder is added to the nitriding furnace, and pure nitrogen gas is blown into the nitriding furnace, and the nitriding furnace is After the furnace is heated to 1100°C, it starts to react with nitrogen, and the reaction lasts for 46 hours. During the reaction, an ultrasonic disperser is used to disperse the molten material, every 3 hours, and the duration of a single dispersion is 30 minutes. The nitriding furnace is in a nitrogen environment After cooling down naturally, take out the frit and crush it finely through a tube mill, and set aside;

[0030] (2) Preparation of cyanamide solution: feed carbon dioxide gas into clear water to control the pH value of the sol...

Embodiment 3

[0038] A kind of method utilizing ultrasonic dispersing device to improve cyanamide yield, comprises the following steps:

[0039] (1) Preparation of calcium cyanamide: After the calcium carbide is crushed, it is evenly mixed with fluorite and calcium oxide, and it is ground into powder by a ball mill, and then the powder is added to the nitriding furnace, and pure nitrogen gas is blown into the nitriding furnace, and the nitriding furnace is After the furnace is heated to 1200°C, it starts to react with nitrogen, and the reaction lasts for 48 hours. During the reaction, an ultrasonic disperser is used to disperse the molten material, every 3 hours, and the duration of a single dispersion is 40 minutes. The nitriding furnace is in a nitrogen environment After cooling down naturally, take out the frit and crush it finely through a tube mill, and set aside;

[0040] (2) Preparation of cyanamide solution: feed carbon dioxide gas into clear water to control the pH value of the sol...

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Abstract

The invention discloses a method for increasing hydrogen cyanamide yield by utilizing an ultrasonic dispersion device. The method comprises the following steps: milling raw materials calcium carbide,fluorite and calcium oxide into powder by a ball mill, placing into a nitriding furnace and reacting in a nitrogen atmosphere; adopting an ultrasonic dispersing meter for dispersing the molten substance; preparing a hydrogen cyanamide aqueous solution under the action of water and carbon dioxide; using the ultrasonic dispersing meter for dispersing the solution system, filtering and separating, thereby acquiring the hydrogen cyanamide solution. According to the invention, ultrasonic wave is added for assisting reaction in the reaction process and the vibration for ultrasonic cavitation is utilized to smash the calcium cyanamide participating in the reaction into micron-scale and even nanoscale powder, so that the solid-liquid contact area is increased. Meanwhile, the carbon dioxide foams are more fine, dispersed and uniform and the gas-liquid contact area is increased, so that the converting use ratio of the calcium cyanamide raw material is increased, the purity and yield of the end product are increased and the method meets the requirements of atom economy.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for increasing the yield of cyanamide by using an ultrasonic dispersion device. 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 main process used in cyanamide solution is the calcium cyanamide method. The specific operation method is: add calcium cyanamide 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 through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/16
CPCC01C3/16
Inventor 马韵升张超梁万根于龙高鹏
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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