Scale inhibition dispersant and preparation method thereof

Abstract

The invention discloses a scale inhibition dispersant and a preparation method thereof, the active component of the scale inhibition dispersant is an acrylic acid-succinimide-hydroxypropyl methacrylate copolymer, the mass content is greater than or equal to 35%, and the molecular weight is 200,000-35,000; the raw materials comprise acrylic acid, succinimide, hydroxypropyl methacrylate, ammonium persulfate, isopropanol and water; comprising the following steps: adding water into a reactor; heating the water in the reactor to 80-95 DEG C; stirring is started, and isopropanol is added; dropwise adding acrylic acid, succinimide, hydroxypropyl methacrylate and ammonium persulfate at the same time; raising the temperature of the materials in the reactor to 95-120 DEG C, and keeping the temperature for 5-8 hours; the scale inhibitor has excellent scale inhibition and dispersion effects on organic matters in a circulating cooling water system and a reverse osmosis system, and can adsorb, stabilize and disperse colloidal pollutants in a limited manner, so that the defect of the existing scale inhibition and dispersion effects of the scale inhibition of the scale inhibition and dispersion agent is overcome, and the performance is remarkably improved and optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial water treatment, and particularly to a scale inhibitor and dispersant for circulating cooling water or reverse osmosis systems. Background Art

[0002] In current industrial production, circulating cooling water systems and reverse osmosis systems play crucial roles. However, during operation, these systems often face a severe challenge, namely the accumulation of salts in water and the problem of scaling.

[0003] For example, circulating cooling water systems are widely used in industries such as power, chemical, metallurgy, and pharmaceuticals to cool various equipment and process media. However, during the circulation process, due to the evaporation and concentration of water, minerals in the water (such as calcium and magnesium ions) gradually increase, forming poorly soluble salts, which deposit on the surface of the equipment, forming hard scale. The presence of scale not only reduces the heat exchange efficiency of the equipment, increases energy consumption, but may also cause equipment blockage, corrosion, and failure, seriously affecting production efficiency and product quality.

[0004] Similarly, as an efficient water treatment technology, reverse osmosis systems also face the challenge of salt scaling. The reverse osmosis membrane is the core component of the system, with selective permeability, capable of intercepting dissolved salts and other impurities in water. However, during long-term operation, calcium, magnesium, and other ions in the water will scale on the membrane surface, resulting in a decline in membrane performance, a reduction in system efficiency, and an increase in maintenance costs.

[0005] To solve the problem of salt scaling in circulating cooling water systems and reverse osmosis systems, various scale inhibitors and dispersants have been developed, such as: hydrolyzed polymaleic anhydride, acrylic acid - 2 - acrylamide - 2 - methylpropanesulfonic acid copolymer, polyepoxysuccinic acid, and polyaspartic acid. These scale inhibitors and dispersants mainly prevent and disperse the scale formed by salt substances in water through mechanisms such as chelation, lattice distortion, and dispersion.

[0006] However, although the above-mentioned existing scale inhibitors and dispersants have alleviated the problem of salt accumulation and scaling in water to a certain extent, they still fail to reach an ideal state in some key performances, especially in terms of scale inhibition and dispersion effects. In view of this, it has become an urgent task to develop a new type of scale inhibitor and dispersant that is more prominent in scale inhibition and dispersion capabilities and can effectively make up for the deficiencies of existing products, aiming to fundamentally solve the performance limitations of existing scale inhibitors and dispersants. Summary of the Invention

[0007] The object of the present invention is to provide a scale inhibitor dispersant and a preparation method thereof. The scale inhibitor dispersant has excellent scale inhibition and dispersion effects on organic substances in circulating cooling water systems and reverse osmosis systems, and can effectively adsorb, stabilize and disperse colloidal pollutants, thus making up for the deficiencies in the scale inhibition and dispersion effects of existing scale inhibitor dispersants and achieving significant improvement and optimization in performance.

[0008] To solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a scale inhibitor dispersant: The active component is an acrylic acid - succinimide - hydroxypropyl methacrylate copolymer.

[0009] In the above technical solution, a more specific technical solution may further be: the mass content of the acrylic acid - succinimide - hydroxypropyl methacrylate copolymer is ≥ 35%.

[0010] Furthermore, the molecular weight of the acrylic acid - succinimide - hydroxypropyl methacrylate copolymer is: 200,000 - 350,000.

[0011] Another technical solution adopted by the present invention is to provide a preparation method of the scale inhibitor dispersant: Its preparation raw materials are: Acrylic acid, succinimide, hydroxypropyl methacrylate, ammonium persulfate, isopropanol, water; Its preparation method includes the following steps: 1) Add water into the reactor; 2) Heat the water in the reactor to 80°C - 95°C; 3) Start stirring and add isopropanol; 4) While dropping acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate, control the temperature of the materials in the reactor at 80°C - 95°C during the dropping process; among them, acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate are dropped simultaneously and are basically dropped completely at the same time; 5) After the dropping is completed, raise the temperature of the materials in the reactor to 95°C - 120°C and keep it warm for 5 hours - 8 hours.

[0012] In the above technical solution, a more specific technical solution may further be: the weight parts of the preparation raw materials are as follows: Acrylic acid 15 parts - 25 parts; Succinimide 5 parts - 10 parts; Hydroxypropyl methacrylate 10 parts - 20 parts; Ammonium persulfate 5 parts - 10 parts; Isopropanol 8 parts - 16 parts; Water 40 parts - 50 parts.

[0013] Further, the water is demineralized water.

[0014] Due to the adoption of the above technical solution, compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is a water treatment chemical reagent used in circulating cooling water or reverse osmosis systems to prevent fouling due to salt accumulation in water; it is characterized by excellent scale inhibition and dispersion effects on organic matter and good adsorption, stabilization, and dispersion effects on colloidal pollutants.

[0015] 2. Acrylic acid (CH2=CH-COOH), succinimide ((NHCOCH2)2), and hydroxypropyl methacrylate (CH2=C(CH3)COOCH2CH(OH)CH3) in the present invention are the main raw materials for synthesis, constituting the finished product molecular group after polymerization; Ammonium persulfate (NH4)2S2O8: initiator; Ammonium persulfate: a strong oxidizing agent that can open the double bonds on the raw material molecules, enabling the opened double bonds of each raw material group to connect to each other to complete the polymerization reaction; Isopropyl alcohol: molecular weight controller. During the polymerization process, the dropping rates of the initiator and each main raw material, as well as temperature control, all determine the molecular weight of the finished product after polymerization. However, the decisive factor in controlling the molecular weight is through the alcoholization effect of isopropyl alcohol, controlling the molecular weight of the finished product within 200,000 to 350,000. Too low a molecular weight cannot achieve the effect of dispersing scale, and too high a molecular weight leads to a flocculation effect, causing the scale to aggregate and lose the dispersion effect; Demineralized water: reaction solvent.

[0016] 3. Appearance of the present invention: light yellow viscous liquid; Active component: ≥35%; pH value (1% aqueous solution): 2 - 5; Molecular weight: 200,000 - 350,000.

[0017] 4. The dosage of the present invention is low, and the dosage concentration is 5 ppm - 50 ppm. Specific implementation method

[0018] The following is a further detailed description of the present invention in combination with examples; Example 1 - A scale inhibitor and dispersant Its preparation raw materials are: 18 parts of acrylic acid, 6 parts of succinimide, 10 parts of hydroxypropyl methacrylate, 6 parts of ammonium persulfate, 11 parts of isopropyl alcohol, and 50 parts of demineralized water; Its preparation method includes the following steps: 1) Add demineralized water to the reaction kettle; 2) Heat the demineralized water in the reaction kettle to 85°C; 3) Start stirring, add isopropanol, and stir evenly; 4) While dropping acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate, control the temperature of the materials in the reaction kettle at 85 °C during the dropping process, and control the overall dropping process within 3 hours; among them, acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate are dropped simultaneously and are basically dropped at the same time; 5) After the dropping is completed, raise the temperature of the materials in the reaction kettle to 110 °C and keep it warm for 6 hours.

[0019] The appearance of the product of this example: light yellow viscous liquid; active component: 31%; pH value (1% aqueous solution): 3.6; molecular weight: 280,000.

[0020] Example 2 - A scale and dispersion inhibitor Its preparation raw materials are: 22 parts of acrylic acid, 7 parts of succinimide, 15 parts of hydroxypropyl methacrylate, 8 parts of ammonium persulfate, 12 parts of isopropanol, 42 parts of demineralized water; Its preparation method includes the following steps: 1) Add demineralized water to the reaction kettle; 2) Heat the demineralized water in the reaction kettle to 80 °C; 3) Start stirring, add isopropanol, and stir evenly; 4) While dropping acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate, control the temperature of the materials in the reaction kettle at 80 °C during the dropping process, and control the overall dropping process within 4 hours; among them, acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate are dropped simultaneously and are basically dropped at the same time; 5) After the dropping is completed, raise the temperature of the materials in the reaction kettle to 100 °C and keep it warm for 5 hours.

[0021] The appearance of the product of this example: light yellow viscous liquid; active component: 35%; pH value (1% aqueous solution): 2.8; molecular weight: 300,000.

[0022] Example 3 - A scale and dispersion inhibitor Its preparation raw materials are: 22 parts of acrylic acid, 8 parts of succinimide, 17 parts of hydroxypropyl methacrylate, 8 parts of ammonium persulfate, 15 parts of isopropanol, 40 parts of water; Its preparation method includes the following steps: 1) Add demineralized water to the reaction kettle; 2) Heat the demineralized water in the reaction kettle to 95 °C; 3) Start stirring, add isopropanol, and stir evenly; 4) While simultaneously dripping acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate, the temperature of the materials in the reaction kettle is controlled at 95°C during the dripping process, and the overall dripping process is controlled within 4 hours; among them, acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate are simultaneously dripped and basically finished dripping at the same time; 5) After the dripping is completed, the materials in the reaction kettle are heated to 120°C and kept warm for 5 hours.

[0023] The appearance of the product in this example: light yellow viscous liquid; active component: 38%; pH value (1% aqueous solution): 2.2; molecular weight: 300,000.

[0024] Detection: Experimental method: The scale inhibition performance of the agent is evaluated by a water bath experiment.

[0025] The specific method is as follows: Place the experimental water in a beaker, and add a certain amount of scale inhibitor dispersant to the water. Place the beaker in a water bath box, and heat the water in the beaker to a certain experimental temperature through water bath heating and maintain it within a certain temperature range during the experiment. During the experiment, replenish the experimental water volume with distilled water to maintain the constancy of the experimental water volume. After a certain period of experiment, detect the hardness value in the water, compare it with the hardness of the original experimental water, and calculate the scale inhibition rate of the scale inhibitor dispersant to evaluate the scale inhibition performance of the scale inhibitor dispersant.

[0026] Detection 1: In high-hardness and high-alkalinity water quality, detect the scale inhibition performance of the scale inhibitor dispersants synthesized in the above 3 groups of implementation cases, and compare the scale inhibition performance of traditional scale inhibitor dispersants such as hydrolyzed polymaleic anhydride, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, polyepoxysuccinic acid, and polyaspartic acid under the same experimental conditions. The purpose of this test is to test and compare the scale inhibition performance of the scale inhibitor dispersants in the 3 groups of implementation cases against carbonate scale.

[0027] The water quality of the experimental water is shown in Table 1 below: Table 1 .

[0028] Experimental conditions: The experimental control temperature is 50°C ± 1°C; the experimental duration is 120 hours.

[0029] The experimental results are shown in Table 2 below: Table 2 .

[0030] Detection 2: In water with high hardness and high sulfate content, the scale inhibition performance of the scale inhibitors synthesized in the above three groups of implementation cases was detected, and the scale inhibition performance of traditional scale inhibitors such as hydrolyzed polymaleic anhydride, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, polyepoxysuccinic acid, and polyaspartic acid was compared under the same experimental conditions. The purpose of this test is to test and compare the performance of the scale inhibitors in the three groups of implementation cases in inhibiting sulfate scale.

[0031] The water quality of the experimental water is shown in Table 3 below: Table 3 。

[0032] Experimental conditions: The experimental temperature was controlled at 50°C ± 1°C; the experimental duration was 120 hours.

[0033] The experimental results are shown in Table 4 below: Table 4 。

[0034] It can be seen from the above test results that: 1. Compared with traditional dispersants, the present invention (such as the products obtained in Examples 1-3) has excellent carbonate scale inhibition and dispersion effects; 2. Compared with traditional dispersants, the present invention (such as the products obtained in Examples 1-3) has excellent sulfate scale inhibition and dispersion effects; 3. The present invention (such as the products obtained in Examples 1-3) can achieve an ideal scale inhibition and dispersion effect with a relatively low dosage, indicating that it has the advantage of low dosage.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scale inhibitor dispersant, characterized in that: The active ingredient is acrylic acid-succinimide-hydroxypropyl methacrylate copolymer.

2. The scale inhibitor and dispersant according to claim 1, characterized in that: The mass content of the acrylic acid-succinimide-hydroxypropyl methacrylate copolymer is ≥35%.

3. The scale inhibitor and dispersant according to claim 1 or 2, characterized in that: The molecular weight of the acrylic acid-succinimide-hydroxypropyl methacrylate copolymer is 200,000 to 350,000.

4. A method for preparing a scale inhibitor and dispersant as claimed in claims 1 to 3, characterized in that: The raw materials for its preparation are: Acrylic acid, succinimide, hydroxypropyl methacrylate, ammonium persulfate, isopropyl alcohol, water; The preparation method comprises the following steps: 1) Add water into the reactor; 2) Heat the water in the reactor to 80°C to 95°C; 3) Turn on stirring and add isopropanol; 4) acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate are added dropwise at the same time, and the temperature of the materials in the reactor is controlled at 80° C. to 95° C. during the addition process; acrylic acid, succinimide, hydroxypropyl methacrylate, and ammonium persulfate are added dropwise at the same time, and the addition is completed at substantially the same time; 5) After the addition is completed, raise the temperature of the materials in the reactor to 95°C to 120°C and keep it warm for 5 to 8 hours.

5. The method for preparing the scale inhibitor and dispersant according to claim 4, characterized in that: The weight parts of the raw materials for the preparation are as follows: 15 to 25 parts of acrylic acid; 5 to 10 parts of succinimide; 10 to 20 parts of hydroxypropyl methacrylate; 5 to 10 parts of ammonium persulfate; 8 to 16 parts of isopropyl alcohol; 40 to 50 parts of water.

6. The method for preparing the scale inhibitor and dispersant according to claim 5, characterized in that: The water is demineralized water.