Method for synthesizing cyanic acid or melamine by utilizing ammonia gas and carbon dioxide

A technology of cyanuric acid and melamine, which is applied in the chemical industry, can solve the problems of high cost, complicated process, and high toxicity of raw materials, and achieve the effect of reducing production cost and production cycle

Active Publication Date: 2012-08-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The first four of the above synthetic process routes have the disadvantages of high toxicity of raw materials, complicated process or high cost, making it difficult to realize large-scale industrial production

Method used

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  • Method for synthesizing cyanic acid or melamine by utilizing ammonia gas and carbon dioxide
  • Method for synthesizing cyanic acid or melamine by utilizing ammonia gas and carbon dioxide
  • Method for synthesizing cyanic acid or melamine by utilizing ammonia gas and carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1. take ammonia, carbon dioxide as raw material synthetic cyanuric acid, reaction formula is:

[0040] 3CO 2 +3NH 3 →C 3 N 3 h 3 o 3 +3H 2 o

[0041] Press n(NH 3 ):n(CO 2 )=0.8: 1 molar ratio, feed ammonia 440g, carbon dioxide 1040g in reactor, at 240-250 ℃, keep system reaction pressure to be 20.0MPa, react 10min; Reaction product is mainly white cyanuric acid (C 3 N 6 h 3 o 3 ) solid, the content is 95%, the content after purification is 98%, and the yield is 95%;

Embodiment 2

[0042] Embodiment 2. take ammonium bicarbonate as raw material synthetic cyanuric acid, and reaction formula is:

[0043] 3NH 4 HCO 3 →C 3 N 3 h 3 o 3 +6H 2 o

[0044] Add 670g of ammonium bicarbonate in the reactor, keep the system reaction pressure at 20.0MPa at 230-250°C, and react for 5min; the reaction product is mainly white cyanuric acid (C 3 N 6 h 3 o 3 ) solid, the content is 95.2%, the content after purification is 98.5%, and the yield is 95%.

Embodiment 3

[0045] Embodiment 3. take ammonia and carbon dioxide as raw material to synthesize cyanuric acid under catalytic conditions, and the reaction formula is:

[0046]

[0047] Press n(NH 3 ):n(CO 2 )=1.1:1 reaction volume, add 440g of ammonia, 1040g of carbon dioxide and 50g of ammonium chloride in the reactor, heat to 200-210°C, keep the system reaction pressure at 15.0MPa, and react for 15min; the reaction product is mainly white three Polycyanic acid (C 3 N 6 h 3 o 3 ) solid, the content is 96%, the content after purification is 99%, and the yield is 96%.

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Abstract

The invention relates to a method for synthesizing cyanic acid or melamine by utilizing ammonia gas and carbon dioxide. The method comprises the following steps: directly reacting by taking ammonia gas and carbon dioxide as raw materials or taking ammonium bicarbonate, ammonium carbonate and ammonium carbamate as the raw materials in the presence of a catalyst or no catalyst under the conditions that the temperature is 200-300 DEG C and the pressure is 0-30MPa to obtain a cyanic acid or melamine product. By using the method disclosed by the invention, a series of problems during the synthesis process of urea are avoided, synthesis production cycle energy consumption, consumption of manpower and physical resources of cyanic acid or melamine are reduced, and production cost is lowered.

Description

technical field [0001] The invention relates to a method for synthesizing cyanuric acid and melamine, which belongs to the technical field of chemical industry. technical background [0002] Both cyanuric acid and melamine belong to triazine heterocyclic compounds, and both are important chemical products that have developed rapidly in my country in recent years. The structural formulas of cyanuric acid (a) and melamine (b) are as follows: [0003] [0004] Cyanuric acid, also known as isocyanuric acid or cyanuric acid, is a widely used synthetic intermediate, such as synthetic resins, flame retardants, herbicides, etc. Cyanuric acid as a raw material for synthetic resins involves medicine, pesticides , coatings, textiles, light industry and other fields. The synthesis process route of cyanuric acid generally has the following types: [0005] 1 Phosgene reacts with ammonia: [0006] 6COCl 2 +6NH 3 →2C 3 N 3 h 3 o 3 +12HCl [0007] 2 Trimerization of cyanate: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/60C07D251/32
Inventor 朱维群王倩阿不都拉江·那斯尔宋名秀孙洪志
Owner SHANDONG UNIV
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