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Preparation method of ammonia for coal-fired flue gas desulfurization and denitration by coproduction

A technology for desulfurization, denitrification, and coal-fired flue gas, which is applied in the preparation/separation of ammonia, the preparation of organic compounds, and the preparation of carbamic acid derivatives. It can solve the problems of increased operating costs for denitrification, reduce CO2 emissions, and improve safety. Sexuality and the effect of increasing economic benefits

Active Publication Date: 2010-12-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] It can be seen from the above reaction that urea is decomposed into ammonia and carbon dioxide, ammonia is used for desulfurization and denitrification, and carbon dioxide is emptied, so only about 50% of urea is used, so the operating cost of denitrification increases

Method used

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  • Preparation method of ammonia for coal-fired flue gas desulfurization and denitration by coproduction
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  • Preparation method of ammonia for coal-fired flue gas desulfurization and denitration by coproduction

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Embodiment 1

[0030] Mix urea and water into a saturated solution, stir and heat to 150-160°C, the ammonia gas produced by the reaction is used for desulfurization and denitrification, the reaction mother liquor is mainly biuret, and biuret products are obtained after treatment. The reaction formula is as follows:

[0031]

Embodiment 2

[0033] Mix urea and flux ammonium sulfate uniformly at a mass ratio of 16:1, put them into a heating device and heat them to 170-180°C, and the ammonia gas released during the reaction is purified and used for desulfurization and denitrification, and the crude product obtained from the reaction Heat treatment with dilute sulfuric acid, then separate, wash with water until neutral, and dry to obtain cyanuric acid product with a yield of 69%. The reaction formula is as follows:

[0034]

Embodiment 3

[0036] Mix urea and propylene glycol at a molar ratio of 1:4, add catalyst-like hydrotalcite with a total mass of reactants of 3%wt, heat to 160°C, and catalyze the reaction. The ammonia gas released during the reaction is used for desulfurization and denitrification, and the reaction product is centrifuged. , the catalyst is reused after treatment, and the mother liquor is distilled under reduced pressure to obtain propylene carbonate. The reaction formula is as follows:

[0037]

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Abstract

The invention relates to a preparation method of ammonia for coal-fired flue gas desulfurization and denitration by coproduction. The method comprises the following steps: the condensation reaction isperformed to urea to obtain ammonia used for desulfurization and denitration, and the cyanuric acid, the biuret or the triuret is obtained by coproduction; or the urea reacts with diatomic alcohol, monohydric alcohol, phenol or amine for substitution to obtain ammonia, and meanwhile, the coproduction products of ethylene carbonate, propylene carbonate, methyl carbonate, diethyl carbonate, dibutylcarbonate or diphenyl carbonate, dimethyl urea, diethyl urea or diphenylurea or carbamate. The method has the advantages of no carbon dioxide, fully utilized carbon and oxygen elements in the urea, improved utilization ratio of the urea and eliminated or reduced emission of the CO2; and the cost of ammonia used for flue gas desulfurization and denitration is reduced and the related products are obtained by coproduction.

Description

technical field [0001] The invention relates to an economical and safe generation method of ammonia gas used in flue gas desulfurization and denitrification. technical background [0002] my country's energy is mainly coal-fired, and coal-fired flue gas is a major emitter of sulfur dioxide and nitrogen oxides, causing serious air pollution. Controlling the emission of sulfur dioxide and nitrogen oxides is one of the important measures to control air pollution in our country. At present, my country has strict standards for the emission of sulfur dioxide and nitrogen oxides from coal-fired flue gas of large boilers. [0003] Sulfur dioxide in flue gas can be removed by ammonia desulfurization process. Ammonia NH is injected into the flue gas 3 with SO in flue gas 2 Reaction, then feed into air to oxidize to obtain ammonium sulfite, the reaction formula is: [0004] NH 3 +H 2 O+SO 2 →(NH 4 ) 2 SO 3 [0005] (NH 4 ) 2 SO 3 +O 2 →(NH 4 ) 2 SO 4 [0006] The am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/02B01D53/48B01D53/54B01D53/60C07D251/32C07C275/62C07C273/18C07D317/38C07D317/36C07C69/96C07C68/00C07C275/06C07C275/28C07C269/04C07C271/28
CPCY02P20/50
Inventor 朱维群刘鑫王福伟张鹏
Owner SHANDONG UNIV