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Ammonia-based flue gas desulfurization method for by-product cyclohexanone oxime

A technology of cyclohexanone oxime and flue gas is applied in the field of preparation of by-product cyclohexanone oxime and cyclohexanone oxime of flue gas desulfurization by ammonia method, which can solve the problems of large consumption, poor economy and the like, and achieve large product sales, High added value and the effect of improving economic efficiency

Active Publication Date: 2018-02-06
SINOPEC NANJING ENG & CONSTR +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has mature technology, small investment, simple operation and good safety, but has obvious disadvantages. The raw material NH 3 and SO 2 The large consumption makes this technology less economical than the HPO method and the NO method

Method used

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  • Ammonia-based flue gas desulfurization method for by-product cyclohexanone oxime
  • Ammonia-based flue gas desulfurization method for by-product cyclohexanone oxime
  • Ammonia-based flue gas desulfurization method for by-product cyclohexanone oxime

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preparation example Construction

[0019] The preparation method of the present invention is basically realized through the following steps (see attached figure 1 ):

[0020] Step A Ammonia flue gas desulfurization to prepare ammonium bisulfite: use ammonia or ammonia water as absorbent to absorb sulfur dioxide in the flue gas to prepare ammonium bisulfite. The concentration of ammonia in the absorbent is 5-100 wt%, preferably 25-33 wt%.

[0021] Step B: solid-liquid separation of desulfurization absorption liquid: removal of solid impurities in the ammonium bisulfite solution, which is a preferred step.

[0022] Preparation of step C hydroxylamine sulfate: react ammonium bisulfite with nitrite and sulfur dioxide to prepare hydroxylamine sulfate.

[0023] Step D dehydrates and concentrates the hydroxylamine sulfate solution prepared in step C, which is a preferred step.

[0024] Step E oximation of cyclohexanone: reaction of hydroxylamine sulfate and cyclohexanone by countercurrent oximation to prepare cyclo...

Embodiment 1

[0071] The treatment object is: 220t / h power plant boiler flue gas, of which SO 2 Content 500mg / Nm 3 , with the concentration of 28wt% ammonia as absorbent.

[0072] The specific steps are: the flue gas enters the absorption tower with a flow rate of 270000Nm 3 / h, absorbed by a two-stage absorption tower. The flow rate of fresh ammonia water added during the absorption process is 0.17m 3 / h. In the first-stage absorption tower, add an oxygen inhibitor, such as p-phenylenediamine, to the absorption liquid, and control the absorption temperature at 40°C; in the second-stage absorption tower, control the absorption temperature at 25°C, and the pH of the liquid in the tower 5.0-5.5. Obtaining the concentration of ammonium bisulfite solution product from the bottom of the primary absorption tower is 32.8kg / m 3 , and containing ammonium sulfite 1.4kg / m 3 . SO in the tail gas discharged from the secondary absorption tower 2 The content is 3.6mg / m 3 , Ammonia escape amount ...

Embodiment 2

[0076] The treatment object is: 220t / h power plant boiler flue gas, of which SO 2 Content 2000mg / Nm 3 , with the concentration of 28wt% ammonia as absorbent.

[0077] The specific steps are: the flue gas enters the absorption tower with a flow rate of 270000Nm 3 / h, absorbed by a two-stage absorption tower. The flow rate of fresh ammonia water added during the absorption process is 0.68m 3 / h. In the first-stage absorption tower, add an oxygen inhibitor, such as p-phenylenediamine, to the absorption liquid, and control the absorption temperature at 40°C; in the second-stage absorption tower, control the absorption temperature at 25°C, and the pH of the liquid in the tower 5.0-5.5; the tail gas is discharged after being washed with water and defogged. SO in exhaust gas 2 Content less than 100mg / m 3 , the amount of ammonia escape is less than 5mg / m 3 . Obtaining the concentration of ammonium bisulfite solution product from the bottom of the primary absorption tower is 1...

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Abstract

The invention discloses a method for producing by-product cyclohexanone-oxime through flue gas desulphurization by an ammonia method. The method comprises the following steps: ammonia or ammoniacal liquor is taken as an absorbent, sulfur dioxide in flue gas is absorbed in a flue gas absorbing tower, then ammonium bisulfite is prepared; the ammonium bisulfite is subjected to a reaction with nitrite and sulfur dioxide to prepare hydroxylamine sulphate; and the hydroxylamine sulphate and cyclohexanone are subjected to a reaction by employing a counter current oximation mode to produce cyclohexanone-oxime. The method has the advantages that SO2-containig flue gas is discharged with a standard, a sulfur resource in the flue gas and an ammonia resource in a desulfurizer can be recovered, a cyclohexanone-oxime product which has the advantages of high additional value and large product market space can be produced, high grade resource utilization of the by-product can be enhanced, waste can be changed into valuables, and economic benefit of flue gas desulphurization by the ammonia method can be increased.

Description

technical field [0001] The invention relates to a preparation method of cyclohexanone oxime, in particular to a method for producing cyclohexanone oxime by-product of ammonia-based flue gas desulfurization, and belongs to the technical fields of environmental protection technology and chemical synthesis. Background technique [0002] Ammonia flue gas desulfurization technology is a wet flue gas desulfurization technology. This method uses ammonia or ammonia water as the absorbent to absorb sulfur dioxide in the flue gas. It is a gas-liquid or gas-gas phase reaction. It has a fast reaction rate and an absorbent High utilization, suitable for high SO 2 Flue gas desulfurization and other advantages. With the continuous development of the synthetic ammonia industry and the continuous improvement and improvement of the ammonia desulfurization process, after entering the 1990s, the ammonia desulfurization process was gradually promoted. At present, ammonia desulfurization is dom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C251/44C07C249/08B01D53/78B01D53/50C01C1/245
CPCB01D53/507B01D2251/2062C01C1/245C07C249/08C07C251/44
Inventor 杨春和李贤陈德兴张鹏兰荣亮
Owner SINOPEC NANJING ENG & CONSTR
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