94% acetic acid turns red in color; seek a post-treatment solution
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Dear experts, the 94% concentration glacial acetic acid produced by my company turns red in color after passing through 316L storage tanks and pipelines. (The acetic acid coming out of the reactor is colorless.) The DSC test results for the red-colored acetic acid are shown in the figure on the right. Preliminary treatment methods: 1. It is suspected that the reddening is caused by the presence of Fe ions; the color change after treatment using resin adsorption is shown in the figure on the right. The color has lightened somewhat, but it has not yet reached the colorless state we desire. I would appreciate any advice from those who are familiar with this process or from equipment manufacturers. If any equipment manufacturer is able to handle this case, please contact me directly. Name: Jiang. Contact number: 18021806670
Check if the storage temperature is high. Carbon fiber filtering can be tried to see its effectiveness. If nothing else works, replace the pipelines and storage tanks.
Distill it; filtration and adsorption should not be able to remove it. I’m not sure what your production process is
If the pipelines and tank areas are cleaned thoroughly before being put into use, the problem of corrosion in the pipeline equipment can be avoided. At low temperatures, 316L is generally suitable for use with acetic acid without any problems.
But your iron level is indeed quite high