Hydrogen Peroxide → Acrylic acid maleic acid

Participants

Reaction Steps

In a 2.5-liters volume SUS-made separable flask equipped with a thermometer, a stirrer and a reflux condenser, was charged 282.8 g of ion-exchanged water (hereinafter referred to as “pure water”), and the aqueous solution was elevated to the boiling point in the reflux state while stirring. Next, 360.0 g of an 80% by weight acrylic acid aqueous solution (hereinafter referred to as “80% AA”), 98.0 g of maleic anhydride (hereinafter referred to as “MA”), 133.3 g of a 15% by weight sodium persulfate aqueous solution (hereinafter referred to as “15% NaPS”), 85.7 g of a 35% by weight hydrogen peroxide aqueous solution (hereinafter referred to as “35% H2O2), and 350.0 g of a 48% by weight sodium hydroxide aqueous solution (hereinafter referred to as “48% NaOH”) were continuously added dropwise at uniform rates from separate dropping nozzles over 180 minutes from the initiation of the polymerization, 150 minutes from the initiation of the polymerization, 190 minutes from the initiation of the polymerization, 120 minutes from the initiation of the polymerization, and 180 minutes from the initiation of the polymerization, respectively, while keeping the reflux state with stirring. After the completion of the dropwise addition of all of the aqueous solutions, the boiling point reflux state was kept over 20 minutes. Finally, 100.0 g of 48% NaOH was added to the reaction mixture to complete the polymerization.

Provenance & Evidence