What causes the residual ammonia water in a coking plant to turn red?
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The residual ammonia water in our company’s ammonia vaporization system suddenly turned red (jujube red); we’re not sure what caused this. At that time, only a type of bituminous coal named “Zichang” was used; after adding this coal, the pressure drop in the HPF desulfurization tower increased by nearly 2000 Pa, and the desulfurization liquid turned slightly darker (although no obvious sulfur foam appeared). In the later stages of sulfur discharge from the sulfur melting kettle, a large amount of black foam is produced; after cooling, it resembles cinder to some extent (when sulfuric acid is added, abundant foam forms). The color of the residual ammonia water in the ammonia stripping system turned jujube-red; the ammonia stripping wastewater also became jujube-red. Have you all encountered such a situation before? Why does it turn red? Has the phenol content in the remaining ammonia water increased significantly?
It might be that the presence of some substance in the ammonia solution caused it to turn red. This substance may be a degradation product, or it may be a residue from other raw materials. It is recommended to test the remaining ammonia solution to identify its components, in order to determine the source of the problem and find a solution. At the same time, it is necessary to pay attention to safety to avoid causing harm to people and the environment. .