Material selection for wet chlorobenzene
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Our pilot-scale production involves the distillation of chlorobenzene/water two-phase mixtures, and we observed severe corrosion of stainless steel 304 within less than 3 months. According to corrosion manuals, wet chlorobenzene is corrosive to stainless steel, but the reasons and mechanisms behind this are not explained. I’m wondering if anyone with expertise in this area could provide some advice and guidance. Thank you!
Chloride ions can cause intergranular corrosion in stainless steel, so it cannot be used
Yes, chloride ions will corrode 304 steel; severe rusting occurs after just 3 months. It seems like the temperature where it’s used is quite high Provide the temperature; anti-corrosion treatment for the inner wall is recommended.
Is the concentration of free chloride ions in chlorobenzene high? I checked the solvent manual, but it doesn’t mention anything about this
The temperature we use is the boiling point of chlorobenzene, around 132°C. My question is: are the free chloride ions in the organic solvent chlorobenzene at a high level?
In environments with water present, it is advisable to keep the chloride ion concentration below 25 mg/L; otherwise, austenitic stainless steel should not be used. Other materials can be considered, such as duplex steel, titanium, or non-metals like graphite and enamel.
This post was last edited by Wang Genrong on 2016-6-2 at 14:49. Chlorobenzene, which has a operating temperature of around 132°C, cannot be handled using stainless steel; it is recommended to use graphite heat exchangers as heaters and condensers.
How much hydrogen chloride is released when chlorobenzene reacts with water? The solvent manual only mentions that the presence of water causes chlorobenzene to release hydrogen chloride, which can corrode equipment
How much hydrogen chloride is released when chlorobenzene reacts with water? The solvent manual only mentions that the presence of water causes chlorobenzene to release hydrogen chloride, which can corrode equipment
Original poster, has the corrosion issue with the tower material been resolved? I’ve encountered a similar problem; I’m unable to find out how much hydrogen chloride is produced when chlorobenzene is present in water