Polyepoxysuccinic acid as environment protecting scale inhibitor and its prepn process
A kind of epoxy succinic acid, environment-friendly technology, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc. And other issues
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Embodiment 1
[0020] Embodiment 1, add 50g maleic anhydride in the four-necked flask that is equipped with stirring condenser, stirring, thermometer, pH meter, dropping funnel, add 75ml water to dissolve again, slowly dropwise add 50% hydrogen under cooling and stirring Sodium oxide aqueous solution 55g, the temperature of control reaction makes it less than 50 ℃. Then heat it in a water bath at 60°C to 65°C. When the temperature rises to 50°C to 60°C, add 1.8g of sodium tungstate catalyst and 60g of 30% hydrogen peroxide. After 10 to 20 minutes, the heat released by the reaction will cause the temperature to rise sharply. After about 15 minutes, the temperature drops to 65°C. Add 50% aqueous sodium hydroxide solution to adjust the pH to about 5, and keep it in a water bath at 60°C to 65°C for 2 hours to obtain epoxysuccinic acid. Then raise the temperature to 80°C-90°C, add a certain amount of 5.0g calcium hydroxide, react for 2.5 hours, purify the reactant, and obtain a colorless or light...
Embodiment 2
[0021]Embodiment 2, add 50g maleic anhydride in the four-neck flask that is equipped with stirring condenser, stirring, thermometer, pH meter, dropping funnel, then add 75ml water to dissolve, slowly add 50% hydrogen dropwise under cooling and stirring Sodium oxide aqueous solution 65g, the temperature of control reaction makes it less than 50 ℃. Then heat it in a water bath at 60°C to 65°C. When the temperature rises to 50°C to 60°C, add 2.0g of sodium tungstate catalyst and 60g of 30% hydrogen peroxide. After 10 to 20 minutes, the heat released by the reaction will cause the temperature to rise sharply. After about 15 minutes, the temperature drops to 65°C. Add 50% sodium hydroxide aqueous solution to adjust the pH to about 5, and keep it in a water bath at 60°C to 65°C for 2 hours to obtain epoxysuccinic acid. Then raise the temperature to 90° C., add a certain amount of 6.5 g of calcium hydroxide, react for 2.0 hours, and purify the reactant to obtain a colorless or pale y...
Embodiment 3
[0022] Embodiment 3, add 50g maleic anhydride in the four-necked flask that is equipped with stirring condenser, stirring, thermometer, pH meter, dropping funnel, add 75ml water dissolving, slowly dropwise add 50% hydrogen under cooling and stirring Sodium oxide aqueous solution 65g, the temperature of control reaction makes it less than 50 ℃. Then heat it in a water bath at 60°C to 65°C. When the temperature rises to 50°C to 60°C, add 2.0g of vanadium pentoxide and 65g of 30% hydrogen peroxide as a catalyst. After 10 to 20 minutes, the heat released by the reaction makes the temperature suddenly Raise to 110°C, and drop to 65°C after about 15 minutes, add 50% aqueous sodium hydroxide solution to adjust the pH to about 4, and keep warm in a water bath at 60°C to 65°C for 2 hours to obtain epoxysuccinic acid. Then raise the temperature to 85° C., add a certain amount of 7.0 g of calcium hydroxide, react for 2.0 hours, and purify the reactant to obtain a colorless or pale yellow...
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