Bisphenol A synthesis scheme
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How should one choose a method for synthesizing polymaleic anhydride in the laboratory? What are the specific temperature, time, reagents, catalysts, and additives required?
In a 500 mL three-necked flask equipped with a condenser, 49 g (0.50 mol) of maleic anhydride and 38 mL of water were added and stirred； Then, 50% NaOH solution is added, along with 3.5 mg of ammonium ferric sulfate as an initiator, and the temperature is raised to 96–98℃ ； The mixture was kept at a constant temperature for 5 hours; during this time, 23 g of a 30% H2O2 solution was slowly added to the reaction mixture via a dropper. After that, the mixture was kept at that temperature for another 2 hours, resulting in a dark brown oily liquid. Upon cooling, numerous crystals formed, yielding polymaleic anhydride.