Preparation process of silicate reverse osmosis scale inhibitor

Abstract

The invention provides a preparation process of a silicate reverse osmosis scale inhibitor, which is characterized by comprising the following steps: maleic anhydride is dissolved into water, under a stirring condition, caustic soda solution is added, and the reaction temperature is controlled to be 20 to 50 DEG C; a reaction system is heated to be 50 to 60 DEG C, oxydol and vanadic oxide are added, the reaction temperature is controlled to be 60 to 70DEG C, and the pH value is 5 to 7; diethylene triamine is added, polymerization reaction is performed, the reaction temperature is controlled to be 80 to 100 DEG C, the reaction time is 3 to 5 h, and maroon grume with solid content which is not lower than 30 percent can be obtained, namely amino disodium polyepoxysuccinicate solution is obtained and can be used as the silicate reverse osmosis scale inhibitor. According to the invention, diethylene triamine is taken as a polymerization initiator for disodium polyepoxysuccinicate, troubles caused by aftertreatment when calcium hydroxide is used as an initiator are avoided, diethylenetriamine is also inserted into the molecular structure of the polyepoxysuccinic acid sodium, and the scale inhibitor is endowed with a novel function of resisting silicate scale.

Description

technical field

[0001] The invention relates to a preparation process of a reverse osmosis membrane scale inhibitor with scale inhibition ability for silicate, which is applied to reverse osmosis (RO) systems, nanofiltration (NF) and nanofiltration (NF) of deionized water, pure water and ultrafiltration water. In the ultrafiltration (UF) system, it can prevent silicate scaling on the membrane surface and have good scale inhibition effect on carbonate, sulfate, iron oxide and aluminum salt, which belongs to the new technology field of water medium scale inhibitor. Background technique

[0002] There are many types of reverse osmosis membrane antiscalants in the market. At present, foreign brands are still the main ones in China, and most of the domestically developed reverse osmosis agents are imitations, lacking independent research and development capabilities. The ingredients of the agents are mainly concentrated in organic phosphines and polycarboxylic acids. . Compared ...

Examples

Embodiment 1

[0020] A preparation process of a silicate reverse osmosis scale inhibitor, the specific steps are: dissolving 98 kilograms of maleic anhydride in 40 kilograms of water, adding 80 kilograms of 50% sodium hydroxide solution dropwise under stirring, and controlling the reaction temperature to 20 ~50°C to convert maleic anhydride into maleic acid sodium salt; after reacting for 0.5h, heat the reaction system to 50~60°C in a water bath of 60~65°C, and add 127 kg of 30% hydrogen peroxide in five times , every interval of 20 minutes; add 12.19 kg of catalyst vanadium pentoxide, carry out the epoxidation reaction of maleate to generate sodium epoxy succinate, control the reaction temperature at 65-70°C, pH value of 5-7, heat preservation reaction After 1.5 hours, 16 kg of diethylenetriamine was added to carry out the polymerization reaction. The reaction temperature was controlled at 85-90°C and the reaction time was 4 hours to obtain a brownish-red viscous liquid with a solid content...

Embodiment 2

[0022] A kind of preparation technology of silicate reverse osmosis antiscaling agent, concrete steps are: dissolve 196 kilograms of maleic anhydride in 100 kilograms of water, slowly add 165 kilograms of 50% sodium hydroxide solution under the condition of stirring, control reaction temperature 40 ~50°C to convert maleic anhydride into maleic acid sodium salt; after reacting for 0.5h, heat the reaction system to 50~60°C in a water bath of 60~65°C, add 200 kg of 30% hydrogen peroxide in six times , every interval of 20 minutes; add 15.19 kg of catalyst vanadium pentoxide, carry out epoxidation reaction of maleate to generate sodium epoxy succinate, control the reaction temperature at 65-70 ° C, pH value of 5.5-6.0, heat preservation reaction After 1 hour, 19 kg of diethylenetriamine was added to carry out the polymerization reaction, the reaction temperature was controlled at 90-100°C, and the reaction time was 3.5 hours to obtain a brown-red viscous liquid with a solid content...

Embodiment 3

[0024] A kind of preparation technology of silicate reverse osmosis antiscalant, concrete steps are: dissolve 294 kilograms of maleic anhydride in 110 kilograms of water, slowly add 300 kilograms of 40% sodium hydroxide solution under the condition of stirring, control reaction temperature 20 ~30 ℃, maleic anhydride is converted into maleic acid sodium salt; after reacting for 0.5 hours, the reaction system is heated to 55~60 ℃ in a water bath of 60~65 ℃, and 320 kg of 30% hydrogen peroxide is added in seven times, Each interval is 20 minutes; add 18.9 kg of catalyst vanadium pentoxide to carry out epoxidation reaction of maleate to generate sodium epoxy succinate, control the reaction temperature at 65-70°C, pH value at 5.5-6.0, and keep warm for 1 hour Finally, add 12 kg of diethylenetriamine to carry out the polymerization reaction, control the reaction temperature to 90-95°C, and the reaction time is 3 hours to obtain a brownish-red viscous liquid with a solid content of no...

technical field

[0001] The invention relates to a preparation process of a reverse osmosis membrane scale inhibitor with scale inhibition ability for silicate, which is applied to reverse osmosis (RO) systems, nanofiltration (NF) and nanofiltration (NF) of deionized water, pure water and ultrafiltration water. In the ultrafiltration (UF) system, it can prevent silicate scaling on the membrane surface and have good scale inhibition effect on carbonate, sulfate, iron oxide and aluminum salt, which belongs to the new technology field of water medium scale inhibitor. Background technique

[0002] There are many types of reverse osmosis membrane antiscalants in the market. At present, foreign brands are still the main ones in China, and most of the domestically developed reverse osmosis agents are imitations, lacking independent research and development capabilities. The ingredients of the agents are mainly concentrated in organic phosphines and polycarboxylic acids. . Compared ...

Examples

Embodiment 1

[0020] A preparation process of a silicate reverse osmosis scale inhibitor, the specific steps are: dissolving 98 kilograms of maleic anhydride in 40 kilograms of water, adding 80 kilograms of 50% sodium hydroxide solution dropwise under stirring, and controlling the reaction temperature to 20 ~50°C to convert maleic anhydride into maleic acid sodium salt; after reacting for 0.5h, heat the reaction system to 50~60°C in a water bath of 60~65°C, and add 127 kg of 30% hydrogen peroxide in five times , every interval of 20 minutes; add 12.19 kg of catalyst vanadium pentoxide, carry out the epoxidation reaction of maleate to generate sodium epoxy succinate, control the reaction temperature at 65-70°C, pH value of 5-7, heat preservation reaction After 1.5 hours, 16 kg of diethylenetriamine was added to carry out the polymerization reaction. The reaction temperature was controlled at 85-90°C and the reaction time was 4 hours to obtain a brownish-red viscous liquid with a solid content...

Embodiment 2

[0022] A kind of preparation technology of silicate reverse osmosis antiscaling agent, concrete steps are: dissolve 196 kilograms of maleic anhydride in 100 kilograms of water, slowly add 165 kilograms of 50% sodium hydroxide solution under the condition of stirring, control reaction temperature 40 ~50°C to convert maleic anhydride into maleic acid sodium salt; after reacting for 0.5h, heat the reaction system to 50~60°C in a water bath of 60~65°C, add 200 kg of 30% hydrogen peroxide in six times , every interval of 20 minutes; add 15.19 kg of catalyst vanadium pentoxide, carry out epoxidation reaction of maleate to generate sodium epoxy succinate, control the reaction temperature at 65-70 ° C, pH value of 5.5-6.0, heat preservation reaction After 1 hour, 19 kg of diethylenetriamine was added to carry out the polymerization reaction, the reaction temperature was controlled at 90-100°C, and the reaction time was 3.5 hours to obtain a brown-red viscous liquid with a solid content...

Embodiment 3

[0024] A kind of preparation technology of silicate reverse osmosis antiscalant, concrete steps are: dissolve 294 kilograms of maleic anhydride in 110 kilograms of water, slowly add 300 kilograms of 40% sodium hydroxide solution under the condition of stirring, control reaction temperature 20 ~30 ℃, maleic anhydride is converted into maleic acid sodium salt; after reacting for 0.5 hours, the reaction system is heated to 55~60 ℃ in a water bath of 60~65 ℃, and 320 kg of 30% hydrogen peroxide is added in seven times, Each interval is 20 minutes; add 18.9 kg of catalyst vanadium pentoxide to carry out epoxidation reaction of maleate to generate sodium epoxy succinate, control the reaction temperature at 65-70°C, pH value at 5.5-6.0, and keep warm for 1 hour Finally, add 12 kg of diethylenetriamine to carry out the polymerization reaction, control the reaction temperature to 90-95°C, and the reaction time is 3 hours to obtain a brownish-red viscous liquid with a solid content of no...

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