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Method for synthesizing 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, large pollution and high production cost, and achieve the effects of low energy consumption, reduced production cost and short production cycle

Inactive Publication Date: 2018-11-13
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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Examples

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Effect test

Embodiment 1

[0021] A kind of synthetic method of calcium cyanamide, with ammonium bicarbonate and calcium oxide as raw material, under the action of catalyst aluminum oxide, protect with nitrogen, synthesize target product calcium cyanamide, reaction equation is as follows:

[0022] 2NH 4 HCO 3 +CaO→CaCN 2 +5H 2 O+CO 2 .

[0023] A kind of synthetic method of calcium cyanamide, concrete steps comprise:

[0024] (1) 79.06g of ammonium bicarbonate and 67.30g of calcium oxide were added to the reactor, and 15.3g of aluminum oxide was added;

[0025] (2) Feed inert gas nitrogen, heat up to 800°C, and react for 35 hours;

[0026] (3) After the reaction was completed, the temperature was lowered to 25° C. to obtain the target product calcium cyanamide (82.17 g), with a yield of 94.6% and a purity of 92.1%.

Embodiment 2

[0028] A kind of synthetic method of calcium cyanamide, with ammonium bicarbonate and calcium oxide as raw material, under the action of catalyst calcium fluoride, protect with nitrogen, synthesize target product calcium cyanamide, reaction equation is as follows:

[0029] 2NH 4 HCO 3 +CaO→CaCN 2 +5H 2 O+CO 2 .

[0030] A kind of synthetic method of calcium cyanamide, concrete steps comprise:

[0031] (1) Add 79.06Kg of ammonium bicarbonate and 67.30Kg of calcium oxide into the reactor, and add 15.62Kg of calcium fluoride;

[0032] (2) Pass in inert gas nitrogen, heat up to 300°C, and react for 50h;

[0033] (3) drop to 25 ℃ after completion of the reaction, obtain target product calcium cyanamide 81.15Kg, yield 91.3%, purity 90.0%.

Embodiment 3

[0035] A kind of synthetic method of calcium cyanamide, is raw material with ammonium bicarbonate and calcium oxide, under the effect of catalyst aluminum oxide, protects with helium, synthesizes target product calcium cyanamide, and reaction equation is as follows:

[0036] 2NH 4 HCO 3 +CaO→CaCN 2 +5H 2 O+CO 2 .

[0037] A kind of synthetic method of calcium cyanamide, concrete steps comprise:

[0038] (1) 79.06Kg of ammonium bicarbonate and 84.12Kg of calcium oxide are added to the reactor, and 10.20Kg of aluminum oxide is added;

[0039] (2) Pass in inert gas helium, heat up to 1000°C, and react for 10 hours;

[0040] (3) drop to 25 DEG C after completion of reaction, obtain target product calcium cyanamide 92.12Kg, yield 92.7%, purity 80.5%.

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Abstract

The invention discloses a method for synthesizing calcium cyanamide. The target product calcium cyanamide is synthesized with ammonium hydrogencarbonate and calcium oxide as raw materials under the effect of a catalyst and protected by inert gas. The method is simple in operation step, low in energy consumption, short in production cycle and high in product yield and purity, and meets the market quality requirements for the calcium cyanamide. The raw materials are easy to obtain, low in price and not subject to geographical restrictions. No waste is generated in the reaction. High environmental value is achieved, and the production cost is reduced under the premise that the product yield and quality are ensured.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and relates to a method for synthesizing chemicals, in particular 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...

Claims

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Application Information

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IPC IPC(8): C01C3/18
CPCC01C3/18
Inventor 安敬瑞张金国于龙高鹏
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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