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The efficient hydroxyalkylation of phenol with formaldehyde to bisphenol F over a thermoregulated phase-separable reaction system containing a water-soluble Brønsted acidic ionic liquid

“…The conventional catalysts for the synthesis of bisphenol F are mainly liquid protonic acids such as oxalic acid, phosphoric acid and hydrochloric acid. [4][5][6] These traditional inorganic acids have some disadvantages of equipment corrosion, environmental pollution with acidic wastewater, and inconvenient purication procedure. Some researchers focused on solid acid catalysts that can avoid the corrosion problem and facilitate the separation of catalysts.…”