Hydrolyzed Polymaleic Anhydride

Hydrolyzed Polymaleic Anhydride

[Structural formula]

[Physical and chemical properties] Brown-yellow transparent liquid, easily soluble in water

[Preparation method] Hydrolyzed polymaleic anhydride (HPMA) has been widely used in water treatment

①Example 1

200 parts (2.

②Example 2 Put 150 parts of water into the reaction kettle while stirring, add 295 parts of maleic anhydride under stirring, heat to raise the temperature in the kettle to 110℃, and then slowly add 48% mass fraction under stirring Adjust the pH value of the NaOH aqueous solution (approximately 2h to complete), maintain the temperature in the kettle not to exceed 128°C during the addition, and then add 46 parts of catalyst, and the addition is completed in about 4h

③Example 3 Add a certain proportion of deionized water to a reactor equipped with an electric stirrer, reflux condenser, and dropping funnel, then add a metered amount of ferric chloride , start stirring, and raise the water temperature in the reactor to 90～95℃

[Technical Index] GB/T10535-1997