Material selection for hydrogen chloride absorption towers
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In the chlorine treatment process, we use a sodium hydroxide solution to absorb chlorine; the equipment used is a PVC and fiberglass absorption tower. During operation, leaks were detected in the tower, and upon inspecting the internal PVC material, many cracks were found. I would like to ask the experts: is this situation caused by an inappropriate choice of material, or is it a quality issue with the PVC sheets?
This post was last edited by Little Chemical Engineer on 2018-10-24 at 14:03. It depends on the concentration of chlorine gas you have. If it’s on the high side, titanium or PTFE-lined materials should be used. Our exhaust gases also contain a small amount of chlorine; the lower part of the treatment tower is lined with PTFE, while the upper part is made of PVC and fiberglass.