How is the bisphenol A sodium salt method operated?

Bisphenol A bpa Sodium salt method: The first step is the preparation of sodium salt: a certain amount of bisphenol A is dissolved in an aqueous methanol solution of sodium hydroxide, nitrogen is introduced for the salt-forming reaction, the solvent is distilled off, and the product is dried to obtain Bisphenol A BPA sodium salt. The second step involves adding the obtained phenoxide and epichlorohydrin into a reactor at a certain ratio, adding a certain amount of quaternary ammonium salt as a catalyst, and conducting the reaction at 80~110°C. After the reaction, water washing and layer separation are performed to remove NaCl. Then, epichlorohydrin is removed by vacuum distillation to obtain the crude product. Finally, organic solvents are used for extraction and water washing, the reaction solution is separated into layers to obtain the organic phase, and the organic phase is dried and distilled to remove the organic solvent, yielding higher-quality Bisphenol A BPA-based epoxy resin. However, this process is overly complex, with difficulties in catalyst separation, a long production cycle, and thus limited industrial application.