Causes of sodium carbonate clogging in the one-extraction system using acetonitrile
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In the Yicui system, rubbery blockages (butadiene polymers) appeared in the tower; it is presumed that these were formed due to the high temperature at the bottom of the tower and the high concentration of butadiene. However, the cause of sodium carbonate buildup that clogs the pump in the upper tower is unclear (analysis shows that over 80% of it is soluble in water, it is alkaline; the presence of bubbles when HCl is added confirms it to be sodium carbonate). I earnestly implore experienced styrene experts to provide some guidance.
It is likely caused by an excessive amount of sodium nitrite added to the solvent. Was the analysis of the sodium nitrite content in the solvent accurate, and what is the quality of the sodium nitrite?
Thank you for your reply. A sodium nitrite concentration of 100–150 ppm is already at the lower end of the range specified by the patent holder. Additionally, tests have shown that sodium nitrite contains no impurities