Synthesis method of calcium cyanamide

A technology of calcium cyanamide and a synthesis method, applied in directions such as cyanamide, can solve the problems of high energy consumption, high production cost, large pollution, etc., and achieve the effects of low energy consumption, short production cycle, and reduced production cost

Pending Publication Date: 2019-10-18
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method for synthesizing calcium cyanamide, which solves the problems of high production cost, large energy consumption, and large pollution in the prior art

Method used

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  • Synthesis method of calcium cyanamide
  • Synthesis method of calcium cyanamide
  • Synthesis method of calcium cyanamide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using calcium oxide, carbon powder and ammonia as raw materials, under the action of calcium fluoride, the target product calcium cyanamide is synthesized. The reaction equation is as follows:

[0030]

[0031] The specific steps are as follows:

[0032] (1 calcium oxide 50.18g, carbon powder 11.78g and calcium fluoride 3.5g are added in the reactor;

[0033] (2) Introduce ammonia gas at 10 L / min, wait for ammonia gas to be introduced for 2 minutes, then heat up to 300°C, and react for 50 hours;

[0034] (3) drop to 25 ℃ after completion of the reaction, the solid obtained is 66.40 g, the yield of calcium cyanamide is 82.16%, and the purity is 88.7%.

Embodiment 2

[0036] Using calcium oxide, carbon powder and ammonia as raw materials, under the action of calcium chloride, the target product calcium cyanamide is synthesized. The reaction equation is as follows:

[0037]

[0038] The specific steps are as follows:

[0039] (1) Add 50.18g of calcium oxide, 16.13g of carbon powder and 19.89g of calcium chloride into the reactor;

[0040] (2) Feed ammonia gas at 500 L / min, wait for 1 minute to feed ammonia gas, then heat up to 1000°C, and react for 5 hours;

[0041] (3) drop to 25 ℃ after completion of the reaction, the solid product obtained is 72.68g, the yield of calcium cyanamide is 90.84%, and the purity is 89.6%.

Embodiment 3

[0043] Using calcium oxide, carbon powder and ammonia as raw materials, the target product calcium cyanamide is synthesized under the action of zinc oxide. The reaction equation is as follows:

[0044]

[0045] The specific steps are as follows:

[0046] (1) Add 50.18g of calcium oxide, 13.98g of carbon powder and 7.29g of zinc oxide into the reactor;

[0047] (2) Feed ammonia gas at 200L / min, wait for 1 minute to feed ammonia gas, then heat up to 750°C, and react for 30 hours;

[0048] (3) After the reaction was completed, the temperature was lowered to 25° C. to obtain 71.02 g of solid product, the yield of calcium cyanamide was 93.35%, and the purity was 93.45%.

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Abstract

Belonging to the technical field of fine chemicals, the invention in particular relates to a synthesis method of calcium cyanamide. The method adopts calcium oxide, carbon powder and ammonia gas as the raw materials to synthesize the target product calcium cyanamide under the action of a catalyst, and the catalyst is one or more of calcium fluoride, calcium chloride and zinc oxide. The method provided by the invention has the advantages of simple operation steps, low energy consumption, short production cycle, high product yield and purity, and meets the quality requirements of the market forcalcium cyanamide; the raw materials are easily available and cheap, and have no geographical limitation; the reaction does not generate waste, and has high environmental protection value. The methodgreatly lowers the production cost, improves the product yield and quality, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a method for synthesizing calcium cyanamide. Background technique [0002] Calcium cyanamide is an alkaline fertilizer and one of the main raw materials of high-efficiency and low-toxic carbendazim pesticides. It can be used as herbicides, fungicides, insecticides, etc., and can be used to produce thiourea, cyanamide, Dicyandiamide, melamine and cyanide melt, etc. [0003] At present, the synthesis method of calcium cyanamide is to crush the calcium carbide and evenly mix it with fluorite and returned lime, grind it into calcium carbide powder through a ball mill, then enter the nitriding furnace, react with nitrogen at a high temperature of 1000 ° C, and form after 42-48 hours Lime nitrogen, the frit is taken out, crushed and finely crushed by a tube mill to obtain the finished product of calcium cyanamide. The current production process has the disadvantage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/18
CPCC01C3/18
Inventor 高鹏崔卫华张宁于龙安敬瑞
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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