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Method for continuously producing cyanamide

A technology for cyanamide and cyanamide material, applied in the field of continuous production of cyanamide, can solve the problems of cyanamide polymerization explosion, cyanamide loss and the like

Active Publication Date: 2019-12-24
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

[0005] In view of this, the purpose of the present invention is to provide a method for continuous production of cyanamide, which can achieve a concentration of 30% or 50% without going through a concentration process to solve the problem of existing cyanamide production. The loss of cyanamide during the process of evaporation and concentration in the process and the risk of explosion of cyanamide polymerization

Method used

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  • Method for continuously producing cyanamide

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Experimental program
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Effect test

Embodiment 1

[0057] (1) Continuously inject mother liquor from the mother liquor tank to the synthesis kettle with a feed rate of 20t / h, and the liquid amount in the synthesis kettle is maintained at 4m 3 Afterwards stop injecting; Simultaneously, before mother liquor is transported into synthetic kettle, in mother liquor, inject ferric trichloride continuously, the consumption of described ferric chloride is 0.01% of mother liquor mass flow rate in mother liquor pipeline; Open stirring, control rotating speed is 150r / min, and carbon dioxide is introduced from the bottom of the synthesis kettle, and the amount of carbon dioxide introduced is controlled to be 100Nm 3 / h; start to add lime nitrogen, through the metering and feeding system, control the amount of lime nitrogen added to 220kg / h; during the synthesis process, control the temperature ≤ 30 ℃, control the pH ≤ 8.5.

[0058] (2) After feeding for 2 hours, turn on the material transfer pump and control the flow rate of the material ...

Embodiment 2

[0062] (1) Continuously inject mother liquor into the synthesis kettle with a feed rate of 20t / h from the mother liquor tank, and the liquid amount in the synthesis kettle is maintained at 3m 3 Stop injecting after; Simultaneously, before mother liquor is transported into synthetic kettle, in mother liquor, inject sodium sulfide continuously, the consumption of described sodium sulfide is 0.01% of mother liquor mass flow rate in mother liquor pipeline; Open stirring, control rotating speed is 150r / min, and Introduce carbon dioxide from the bottom of the synthesis kettle, and control the amount of carbon dioxide inflow to 120Nm 3 / h; start to add lime nitrogen, through the metering and feeding system, control the amount of lime nitrogen added to 220kg / h; during the synthesis process, control the temperature ≤ 30 ℃, control the pH ≤ 8.5.

[0063] (2) After feeding for 1 hour, turn on the material transfer pump and control the flow rate of the material transfer pump to 1m 3 / h, ...

Embodiment 3

[0067] (1) Continuously inject mother liquor into the synthesis kettle with a feed rate of 20t / h from the mother liquor tank, and the liquid amount in the synthesis kettle is maintained at 4m 3 Stop injecting after; Simultaneously, before mother liquor is conveyed into synthetic kettle, in mother liquor, inject ferric trichloride continuously, the consumption of described ferric chloride is 0.02% of mother liquor mass flow rate in the mother liquor pipeline; Open stirring, control rotating speed is 200r / min, and carbon dioxide is introduced from the bottom of the synthesis kettle, and the amount of carbon dioxide introduced is controlled at 120Nm 3 / h; start to add lime nitrogen, through the metering and feeding system, control the amount of lime nitrogen added to 220kg / h; during the synthesis process, control the temperature ≤ 30 ℃, control the pH ≤ 8.5.

[0068] (2) After feeding for 1 hour, turn on the material transfer pump and control the flow rate of the material transf...

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Abstract

The invention provides a method for continuously producing cyanamide, which comprises the following steps: a) continuously injecting mother liquor and a stabilizer into a synthesis kettle, and introducing carbon dioxide from the bottom of the synthesis kettle under stirring, meanwhile, feeding lime nitrogen for reaction to obtain a cyanamide feed liquid, wherein the reaction temperature is less than or equal to 30 DEG C, and the pH value is less than or equal to 8.5; b) continuously filtering the cyanamide feed liquid obtained in the step a) through a filter to respectively obtain filtrate andfilter residues, wherein the filtrate is circulated to the synthesis kettle for continuous reaction; c) when the content of cyanamide in the filtrate reaches a preset value, outputting the filtrate,and controlling the ratio of the circulation volume to the delivery volume of the filtrate to be (2-5):1, meanwhile, adjusting the amount of the mother liquor and the stabilizer continuously injectedinto the synthesis kettle, thereby keeping the amount of the liquid in the synthesis kettle unchanged; and d) sequentially carrying out precision filtration treatment and acidification on the outputted cyanamide to obtain a cyanamide product. By adopting the method, continuous production can be realized, and the product loss and explosion risk caused by cyanamide polymerization can be reduced.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, more specifically, relates to a method for continuously producing cyanamide. Background technique [0002] Cyanamide is a kind of pharmaceutical raw material and intermediate, mainly used in the production of cytarabine hydrochloride, 3-amino-5-hydroxyl 1,2,4-triazole, etc., and is also a raw material for organic synthesis, such as the production of cyanamide Amide, dicyandiamide, methyl carbamate, etc., and then produce pharmaceutical barbituric acid, sulfa drugs, various guanidine salts, pesticide Zhiyaling, carbendazim, creatine, etc. Cyanamide can be used as a plant growth regulator in agriculture, with both insecticidal and bactericidal effects. Especially in the production of cherries and grapes, it is a good dormancy terminator, which can lead to early flowering and fruiting, increase yield, and change fruit flesh quality. [0003] The physical and chemical properties of the ...

Claims

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Application Information

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IPC IPC(8): C01C3/16
CPCC01C3/16
Inventor 张超梁万根刘冠宏崔卫华张宁曹斌
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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