An improved device and method for removing phenol and desulfurization by ammonia washing method

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...

AI Technical Summary

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.

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