An improved device and method for removing phenol and desulfurization by ammonia 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: 2016-06-29
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the process of coal chemical production, when the wastewater containing phenol and ammonia is stripped to remove ammonia, the by-produced ammonia often contains a large amount of phenols, H 2 S, organic sulfur and other impurities, thus affecting 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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  • An improved device and method for removing phenol and desulfurization by ammonia washing method

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Experimental program
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Effect test

Embodiment 1

[0033] The flow rate is 1800kg / h and the phenol content is 4000mg / m 3 、H 2 Crude ammonia gas with 0.2% S content 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.

[0034] Treatment result: when the treated ammonia gas is diluted into dilute ammonia water, the phenol content is less than 48mg / L, H 2 The S content is less than 12mg / L, which can meet the desulfurization requirements.

Embodiment 2

[0036] The flow rate is 1500kg / h and the phenol content is 3000mg / m 3 、H 2 Crude ammonia gas with 0.2% S content 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 top of the ammonia purification tower is 0° C.

[0037]Treatment result: the treated ammonia gas is absorbed into dilute ammonia water, and the phenol content is less than 20mg / L, H 2 The S content is less than 10mg / L, which can meet the desulfurization requirements.

Embodiment 3

[0039] 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.

[0040] 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.

[0041] Treatment result: the treated ammonia gas is absorbed into dilute ammonia water, and the phenol content is less than 18mg / L, H 2 The S content is less than 13mg / L, which can meet the desulfurization requirements.

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Abstract

The invention discloses an improved device for removing phenol and desulfurization by washing with ammonia water, which comprises an ammonia gas purification tower, a heat exchanger and a pump. At the top of the ammonia gas purification tower, the liquid ammonia feed pipe is connected to the middle or lower part of the ammonia gas purification tower, the top of the ammonia gas purification tower is connected to the follow-up device, and the bottom of the tower is connected to the lower circulation return port of the ammonia gas purification tower and the raw material through the pump. The pipeline connected to the water tank, the side line in the middle of the ammonia purification tower passes through the pump and connects to the upper circulation return port of the ammonia purification tower; The overflow port of the flow pipe is connected to the upper part of the lower packing. It also discloses a method for using the device to remove phenol and desulfurize by washing with ammonia water. The invention can effectively ensure the stability of the liquid level in the ammonia water collection area in the middle of the tower, and effectively remove impurities such as phenols, H2S, and organic sulfur in the recovered ammonia, so that 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 wastewater containing phenol and ammonia is stripped to remove ammonia, the by-produced ammonia often contains a large amount of phenols, H 2 S, organic sulfur and other impurities, thus affecting 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 amm...

Claims

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Application Information

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Patent Type & Authority Patents(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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