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Improved device and method for dephenolization and desulfuration according to ammonium hydroxide washing method

A technology for washing and dephenolizing with ammonia water, which is applied in the preparation/separation of ammonia, etc. It can solve the problems of deterioration of washing effect, unstable liquid level, and fluctuation of washing liquid volume, so as to improve the treatment effect, reduce the overall energy consumption, and meet the quality requirements. required effect

Active Publication Date: 2014-01-22
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

[0002] In the process of coal chemical production, when the waste water containing phenol and ammonia is stripped and deammoniated, the by-produced ammonia often contains a large amount of impurities such as phenols, H2S, organic sulfur, etc., which affects the use and sale of ammonia.
Regarding the purification of ammonia, there are also some methods, among which the ammonia water washing method is the most widely used link, but there are some defects in the previous ammonia water washing method: some ammonia water washing devices only set up a washing process, because the dilute ammonia water used for tower top washing comes from the tower Therefore, the poor quality of ammonia water will lead to poor washing effect; some ammonia water washing devices have too small liquid-gas ratio in process design, resulting in poor contact between ammonia gas and dilute ammonia water, and the washing effect will be even worse
However, the liquid level in the ammonia water collection area in the middle of the tower is unstable in this invention, which is likely to cause problems such as evacuation, cavitation, and fluctuations in the amount of washing liquid, which greatly affects the washing effect.

Method used

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  • Improved device and method for dephenolization and desulfuration according to ammonium hydroxide washing method

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Effect test

Embodiment 1

[0032] The flow rate is 1800kg / h and the phenol content is 4000mg / m 3 、H 2 Crude ammonia gas with 0.2% S content is attached figure 1 The device shown is processed. The upper and lower sections of the ammonia gas purification tower are structured packing, the theoretical stages are both 10, the liquid-gas mass ratio of the upper section is 12, and the liquid-gas mass ratio of the lower section is 14. The cooling temperature of the circulating ammonia water is controlled to be 30°C, so that the top temperature of the ammonia purification tower is -2°C.

[0033] Treatment results: When the treated ammonia gas is diluted into dilute ammonia water, the phenol content is <48mg / L and the H2S content is <12mg / L, which can meet the desulfurization requirements.

Embodiment 2

[0035] The crude ammonia gas with flow rate 1500kg / h phenol content 3000mg / m3 and H2S content 0.2% is attached figure 1 The device shown is processed. The upper and lower sections of the ammonia gas purification tower are structured packing, the theoretical stages are 18 and 16 respectively, the liquid-gas mass ratio of the upper section is 25, and the liquid-gas mass ratio of the lower section is 18. The cooling temperature of the circulating ammonia water is controlled to be 15° C., so that the temperature of the tower top of the ammonia purification tower is 0° C.

[0036]Treatment results: The treated ammonia gas is absorbed into dilute ammonia water, the phenol content is <20mg / L, and the H2S content is <10mg / L, which can meet the desulfurization requirements.

Embodiment 3

[0038] The flow rate is 3000kg / h and the phenol content is 3500mg / m 3 、H 2 Crude ammonia gas with 1% S content is attached figure 1 The device shown is processed. The upper and lower sections of the ammonia gas purification tower are structured packing, the theoretical stages are 16 and 14 respectively, the liquid-gas mass ratio of the upper section is 20, and the liquid-gas mass ratio of the lower section is 15. The cooling temperature of the circulating ammonia water is controlled to be 35°C, and the top temperature of the ammonia gas purification tower is 40°C.

[0039] Treatment results: The treated ammonia gas is absorbed into dilute ammonia water, the phenol content is <18mg / L, and the H2S content is <13mg / L, which can meet the desulfurization requirements.

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Abstract

The invention discloses an improved device for dephenolization and desulfuration according to the ammonium hydroxide washing method. The improved device for dephenolization and desulfuration according to the ammonium hydroxide washing method comprises an ammonia gas purification tower, a heat exchanger and a pump. A rough ammonia gas feeding pipeline is connected to the bottom of the ammonia gas purification tower. A fresh dilute aqueous ammonia feeding pipeline is connected to the top of the ammonia gas purification tower. A liquid ammonia feeding pipeline is connected to the middle or the lower portion of the ammonia gas purification tower. The top of the ammonia gas purification tower is connected with a following-up device. The bottom of the ammonia gas purification tower is connected with a lower circulation return opening of the ammonia gas purification tower and a pipeline connected with a raw material water tank through a pump. The middle side line of the ammonia gas purification tower is connected with an upper circulation return opening of the ammonia gas purification tower through a pump. A liquid collecting disk is arranged in the middle of the ammonia gas purification tower. A gas rising cap and an overflowing pipe are arranged on the liquid collecting disk. An overflowing opening of the overflowing pipe is connected with the upper portion of a lower-section packing. The invention further discloses a method for dephenolization and desulfuration according to the ammonium hydroxide washing method through the device. According to the improved device and method for dephenolization and desulfuration according to the ammonium hydroxide washing method, a stable liquid level of an ammonium hydroxide collecting area arranged in the middle of the mmonia gas purification tower can be effectively guaranteed, impurities such as phenols, H2S and organic sulfur of recycled ammonia can be effectively removed, and the purity of the ammonia is greatly improved.

Description

technical field [0001] The invention relates to the technical field of recycling coal chemical wastewater, in particular to an improved device and method for removing phenol and desulfurization by washing with ammonia water. Background technique [0002] In the process of coal chemical production, when the waste water containing phenol and ammonia is stripped and deammoniated, the by-produced ammonia often contains a large amount of impurities such as phenols, H2S, organic sulfur, etc., which affects the use and sale of ammonia. . Regarding the purification of ammonia, there are also some methods, among which the ammonia water washing method is the most widely used link, but there are some defects in the previous ammonia water washing method: some ammonia water washing devices only set up a washing process, because the dilute ammonia water used for tower top washing comes from the tower Therefore, the poor quality of ammonia water will lead to poor washing effect; and some ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/02
Inventor 盖恒军黄辉华国洪跃王朝文王玉忠朱艳红
Owner QINGDAO UNIV OF SCI & TECH
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