Reverse osmosis membrane scale inhibitor

Abstract

The invention relates to the technical field of water treatment, and discloses a reverse osmosis membrane scale inhibitor, which is prepared from the following raw materials in parts by weight: 18 to 22 parts of waterborne acrylic resin, 10 to 15 parts of sodium polyaspartate, 3 to 7 parts of glycine, 8 to 12 parts of polyacrylic acid, 58 to 62 parts of water, 7 to 8.8 parts of citric acid, 5.5 to 6 parts of phytic acid and 2 to 5 parts of stabilizing and balancing agent. The reverse osmosis membrane scale inhibitor can effectively prevent ions such as calcium, magnesium and the like from being combined with sulfate, carbonate and the like, the service life of a reverse osmosis membrane is remarkably prolonged, the water treatment efficiency is remarkably improved, the service life of the reverse osmosis membrane is effectively prolonged, the replacement frequency is reduced, the energy consumption is reduced, all the components are environment-friendly substances, the burden on the environment is reduced, and the cost is reduced. The production and use cost is greatly reduced, the stabilizing and balancing agent can provide good stability and a thickening effect, meanwhile, the chemical activity and effectiveness of the passivation solution are kept, citric acid and polyacrylic acid can form a compound through weak interaction in an aqueous solution, and therefore the overall descaling and anti-corrosion performance of a mixture is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to a reverse osmosis membrane scale inhibitor. Background Art

[0002] Reverse Osmosis (RO) technology is an effective water treatment technology that is widely used in seawater desalination, sewage treatment and pure water preparation. Reverse osmosis technology separates dissolved solids and other impurities from water through a semi-permeable membrane. However, in actual applications, hardness components in water such as calcium and magnesium ions can combine with carbonates, phosphates, sulfates, etc. to form scale, which not only reduces the efficiency of the reverse osmosis membrane, but also shortens its service life.

[0003] The scale inhibitors on the market mainly include phosphates, polycarboxylates and polyphosphates, etc. These scale inhibitors have problems such as environmental pollution, high cost and insufficient chemical stability during use. Therefore, the development of a new type of scale inhibitor that is environmentally friendly, low-cost and effective is an urgent problem that the industry needs to solve. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a reverse osmosis membrane antiscalant, which aims to solve the problems of high cost, serious environmental pollution, poor chemical stability and so on of existing reverse osmosis membrane antiscalants, so as to achieve efficient, low-cost and environmentally friendly antiscaling effect.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a reverse osmosis membrane scale inhibitor, comprising the following raw materials in parts by weight: 18-22 parts of water-based acrylic resin, 10-15 parts of sodium polyaspartate (PASP), 3-7 parts of glycine, 8-12 parts of polyacrylic acid (PAA), 58-62 parts of water, 7-8.8 parts of citric acid, 5.5-6 parts of phytic acid, and 2-5 parts of a stabilizing equalizer.

[0006] As a further description of the above technical solution:

[0007] The stabilizing and balancing agent comprises the following raw materials in percentages: 20-25% waterborne polyurethane resin, 1-2% carboxymethyl cellulose CMC, 2-3% sodium polyacrylate PAA, 3-5% glycerol, 0.5-1% citric acid, 1-2% zinc chloride, 2-4% ethylene glycol, and the balance is deionized water.

[0008] As a further description of the above technical solution:

[0009] The method for using the stabilizing agent comprises the following steps:

[0010] Weigh all ingredients in proportion;

[0011] First, add water into the container, and then add carboxymethyl cellulose, polyurethane resin, glycerin, citric acid, sodium polyacrylate and zinc chloride in sequence;

[0012] Using a mixer, blend on low speed until all ingredients are completely dissolved and well combined;

[0013] Finally add ethylene glycol and continue stirring until completely homogeneous.

[0014] As a further description of the above technical solution:

[0015] The stirring speed of the mixer at low speed is 200-300 rpm, and the stirring time is 30-60 minutes.

[0016] As a further description of the above technical solution:

[0017] The preparation method of the reverse osmosis membrane antiscalant comprises the following steps:

[0018] S1. Prepare raw materials: first measure the weight of each raw material;

[0019] S2, dissolving and mixing: adding water to a reaction kettle or mixer, adding water-based acrylic resin, stirring at the same time to promote dissolution, the stirring speed is 200-260rpm, gradually adding sodium polyaspartate, polyacrylic acid, and glycine, stirring for 20-30 minutes at a stirring speed of 260-300rpm after each addition of new ingredients to form a mixture;

[0020] S3. Adjusting pH value: gradually adding citric acid and phytic acid, measuring the pH value of the mixture with a pH meter, and adjusting the pH value to 6.5-7.5 with citric acid and phytic acid;

[0021] S4. Adding a stabilizing agent: Add the stabilizing agent, stirring at a speed of 260-300 rpm, continue stirring for 60-65 minutes, and mix evenly;

[0022] S5. Cooling and filtering: After the reaction is completed, the mixture is allowed to cool naturally to room temperature, and the mixture is filtered to remove unreacted particles or impurities.

[0023] As a further description of the above technical solution:

[0024] In step S2, the reactor or mixer is heated to 42-46°C, and cooled to room temperature for 3-5 hours before step S6.

[0025] As a further description of the above technical solution:

[0026] The reverse osmosis membrane antiscalant is applied by adding the reverse osmosis membrane antiscalant to the water inlet of the reverse osmosis system, and the recommended dosage is 0.1‰-0.5‰ of the water inlet.

[0027] The present invention has the following beneficial effects:

[0028] 1. In the present invention, the reverse osmosis membrane scale inhibitor can effectively prevent the combination of calcium and magnesium ions with sulfates, carbonates, etc., significantly improve the service life and water treatment efficiency of the reverse osmosis membrane, effectively extend the service life of the reverse osmosis membrane, reduce the replacement frequency, and reduce energy consumption. All ingredients are environmentally friendly substances, which reduces the burden on the environment. Due to the use of simple and low-cost raw materials, the production and use costs are greatly reduced.

[0029] 2. In the present invention, an environmentally friendly stabilizing balancer is developed, which can provide good stability and thickening effect while maintaining good chemical activity and effectiveness.

[0030] 3. In the present invention, citric acid and polyacrylic acid form a complex in an aqueous solution through weak interactions, thereby improving the overall descaling and anti-corrosion properties of the mixture. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The embodiment of the present invention provides a reverse osmosis membrane scale inhibitor, comprising the following raw materials in parts by weight: 18-22 parts of aqueous acrylic resin, 10-15 parts of sodium polyaspartate, 3-7 parts of glycine, 8-12 parts of polyacrylic acid, 58-62 parts of water, 7-8.8 parts of citric acid, 5.5-6 parts of phytic acid, and 2-5 parts of a stabilizer.

[0033] Sodium polyaspartate (PASP): PASP is a highly efficient biodegradable polyamino acid scale inhibitor that can effectively control the reaction of calcium and magnesium ions with carbonates and sulfates to prevent scale formation.

[0034] Glycine: As a natural amino acid, glycine can improve the pH stability of aqueous solutions and enhance the scale inhibition effect of PASP.

[0035] Polyacrylic acid (PAA): PAA has good dispersing properties and can prevent the further growth and aggregation of already formed tiny scaling particles.

[0036] Water: used to dissolve the above ingredients to form a uniform solution.

[0037] Ingredients such as water-based acrylic resin, citric acid, and phytic acid are mainly used to provide corrosion protection, increase adhesion, and improve the corrosion resistance of materials. Sodium polyaspartate (PASP), glycine, and polyacrylic acid (PAA) are mainly used to prevent the formation and deposition of scale.

[0038] The stabilizing balancer comprises the following raw materials in percentages: 20-25% of waterborne polyurethane resin, 1-2% of carboxymethyl cellulose CMC, 2-3% of sodium polyacrylate PAA, 3-5% of glycerol, 0.5-1% of citric acid, 1-2% of zinc chloride, 2-4% of ethylene glycol, and the balance is deionized water.

[0039] Waterborne polyurethane resin: Waterborne polyurethane resin acts as a thickener and stabilizer, providing good film-forming properties and chemical stability.

[0040] Carboxymethyl cellulose (CMC): CMC is a water-soluble polymer commonly used as a thickener, which can effectively increase the viscosity of the solution and provide stability.

[0041] Sodium Polyacrylate (PAA): As a highly efficient dispersant and stabilizer, PAA can help maintain the uniform distribution of other ingredients and avoid sedimentation and agglomeration.

[0042] Glycerin: Glycerin can act as a plasticizer and wetting agent, helping to improve the fluidity and wettability of the entire system.

[0043] Citric Acid: Adjusts pH, increases solution stability, and prevents excessive metal reaction.

[0044] Zinc Chloride: As an active component in the passivator, it can provide additional corrosion protection and passivation effects.

[0045] Ethylene glycol: acts as a solvent, helping to dissolve the other components and adjusting the viscosity and freezing point of the solution.

[0046] Deionized Water: Serves as a solvent, providing the necessary medium to dissolve and stabilize the other ingredients.

[0047] The method for using the stabilizing agent comprises the following steps:

[0048] Weigh all ingredients in proportion;

[0049] First, add water into the container, and then add carboxymethyl cellulose, polyurethane resin, glycerin, citric acid, sodium polyacrylate and zinc chloride in sequence;

[0050] Use a blender at low speed, 200 rpm, for 60 minutes, until all ingredients are completely dissolved and well mixed.

[0051] Finally, add ethylene glycol and continue stirring until completely uniform. The mixer speed is 300 rpm and the stirring time is 30 minutes. Adjust according to the actual situation to ensure that the material will not be sheared and denatured due to excessive stirring and ensure complete uniformity.

[0052] This formulation provides good stability and thickening while maintaining the chemical activity and effectiveness of the passivating fluid.

[0053] The method for preparing the reverse osmosis membrane antiscalant comprises the following steps:

[0054] S1. Prepare the raw materials: First, measure the weight of each raw material and make sure they all meet the recipe requirements.

[0055] S2. Dissolving and mixing: Add water to a large-capacity reactor or mixer, add water-based acrylic resin, and stir to promote dissolution at a stirring speed of 200-260rpm. Gradually add sodium polyaspartate, polyacrylic acid, and glycine. After each addition of a new ingredient, stir at a stirring speed of 260-300rpm for 20-30 minutes to form a mixture; ensure sufficient stirring after each addition of a new ingredient to avoid caking and ensure complete mixing.

[0056] S3. Adjust pH: gradually add citric acid and phytic acid, use a pH meter to measure the pH of the mixture, and use citric acid and phytic acid to adjust the pH to 6.5-7.5; citric acid and phytic acid help adjust the pH at this stage to achieve ideal reaction conditions.

[0057] S4. Adding a stabilizing agent: Add the stabilizing agent, stirring at a speed of 260-300 rpm, continue stirring for 60-65 minutes, and mix evenly to ensure the stability and uniformity of the mixture.

[0058] Check the pH and viscosity of the mixture again and adjust if necessary.

[0059] Check for undissolved particles to ensure that all ingredients are fully reacted and mixed.

[0060] If desired, the mixture may be heated to facilitate certain chemical reactions or to improve solubility.

[0061] Maintain the desired reaction time and temperature to ensure that all ingredients react fully.

[0062] S5. Cooling and filtering: After the reaction is completed, the mixture is allowed to cool naturally to room temperature, and the mixture is filtered to remove unreacted particles or impurities.

[0063] The final product is subjected to a series of quality control tests, including stability tests, effectiveness tests (such as antiscaling ability) and safety tests. The prepared antiscalant is packaged according to the appropriate container and label requirements. It is stored in a dry, cool and dark environment to maintain the effectiveness and safety of the product.

[0064] In step S2, the reactor or mixer is heated to 42-46°C, and cooled to room temperature for 3-5 hours before step S6.

[0065] Application of reverse osmosis membrane antiscalant: Add the reverse osmosis membrane antiscalant of the present invention to the water inlet of the reverse osmosis system. The recommended dosage is 0.1‰-0.5‰ of the water inlet.

[0066] The reverse osmosis membrane scale inhibitor of the present invention can effectively prevent the combination of calcium and magnesium ions with sulfate, carbonate and the like, and significantly improve the service life of the reverse osmosis membrane and the water treatment efficiency.

[0067] Citric acid and polyacrylic acid will form a complex through weak interactions in aqueous solution, which may improve the overall descaling and anti-corrosion performance of the mixture. The following is an introduction in conjunction with specific embodiments: Embodiment 1:

[0068] Reverse osmosis membrane antiscalant formula:

[0069] Water-based acrylic resin: 20 parts

[0070] Sodium polyaspartate (PASP): 12 parts Glycine: 5 parts

[0071] Polyacrylic acid (PAA): 10 parts

[0072] Water: 60 parts

[0073] Citric acid: 8 parts

[0074] Phytic acid: 6 parts Stabilizing balancer: 3 parts Stabilizing balancer formula:

[0075] Waterborne polyurethane resin: 23%

[0076] Carboxymethyl cellulose (CMC): 1.5% Sodium polyacrylate (PAA): 2.5%

[0077] Glycerin: 4%

[0078] Citric acid: 0.75%

[0079] Zinc chloride: 1.5%

[0080] Ethylene glycol: 3%

[0081] Deionized water: Residue test parameters and results:

[0082] Treatment agent dosage: 50ppm

[0083] Initial hardness: 300ppm

[0084] Initial TDS: 500ppm

[0085] Test temperature: 60℃

[0086] Test time: 24 hours

[0087] Scale weight: 0.5g

[0088] Scale inhibition rate: 90%

[0089] Embodiment 2:

[0090] Test parameters and results:

[0091] Treatment agent dosage: 100ppm

[0092] Scale weight: 0.2g

[0093] Scale inhibition rate: 96%

[0094] Embodiment 3:

[0095] Test parameters and results:

[0096] Treatment agent dosage: 150ppm

[0097] Scale weight: 0.1g

[0098] Scale inhibition rate: 98%

[0099] Example 4

[0100] Test parameters and results:

[0101] Treatment agent dosage: 200ppm

[0102] Scale weight: 0.05g

[0103] Scale inhibition rate: 99%

[0104] These examples clearly demonstrate the effect of different treatment agent dosages on the scale inhibition rate, from which it can be seen that with the increase in treatment agent dosage, the scale inhibition effect is significantly improved.

[0105] Record and analyze the experimental data. Table 1 below is the scale inhibition rate test data:

[0106] Table 1

[0107]

[0108] Among them, the table fields are explained as follows:

[0109] Serial number: marks each independent experiment, corresponding to Example 1 to Example 4 respectively.

[0110] Treatment agent dosage: record the amount of reverse osmosis membrane antiscalant added to the water sample, expressed in ppm.

[0111] Initial hardness: The hardness value of the water sample before the experiment begins, measured in ppm.

[0112] Initial TDS (Total Dissolved Solids): The total dissolved solids content of the water sample before the experiment begins.

[0113] Test Temperature: The water temperature maintained during the experiment.

[0114] Test duration: The duration of the experiment, in hours.

[0115] Scale weight: The weight of scale formed on the experimental equipment after the experiment.

[0116] Scale inhibition rate (%): The scale inhibition efficiency percentage calculated based on the weight of scale before and after treatment.

[0117] By using the scale inhibitor of the present invention, the following expected effects can be achieved:

[0118] Improve efficiency: significantly improve the treatment efficiency of the reverse osmosis system and reduce energy consumption.

[0119] Extend life: effectively extend the service life of the reverse osmosis membrane and reduce the frequency of replacement.

[0120] Environmentally friendly: All ingredients are environmentally friendly substances, reducing the burden on the environment.

[0121] Cost-effectiveness: Due to the use of simple and low-cost raw materials, the production and use costs are greatly reduced.

[0122] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reverse osmosis membrane antiscalant, characterized in that: The invention comprises the following raw materials in parts by weight: 18-22 parts of water-based acrylic resin, 10-15 parts of sodium polyaspartate, 3-7 parts of glycine, 8-12 parts of polyacrylic acid, 58-62 parts of water, 7-8.8 parts of citric acid, 5.5-6 parts of phytic acid and 2-5 parts of a stabilizing balancer.

2. A reverse osmosis membrane antiscalant according to claim 1, characterized in that: The stabilizing and balancing agent comprises the following raw materials in percentages: 20-25% waterborne polyurethane resin, 1-2% carboxymethyl cellulose CMC, 2-3% sodium polyacrylate PAA, 3-5% glycerol, 0.5-1% citric acid, 1-2% zinc chloride, 2-4% ethylene glycol, and the balance is deionized water.

3. A reverse osmosis membrane antiscalant according to claim 2, characterized in that: The method for using the stabilizing agent comprises the following steps: Weigh all ingredients in proportion; First, add water into the container, and then add carboxymethyl cellulose, polyurethane resin, glycerin, citric acid, sodium polyacrylate and zinc chloride in sequence; Using a mixer, blend on low speed until all ingredients are completely dissolved and well combined; Finally add ethylene glycol and continue stirring until completely homogeneous.

4. A reverse osmosis membrane antiscalant according to claim 3, characterized in that: The stirring speed of the mixer at low speed is 200-300 rpm, and the stirring time is 30-60 minutes.

5. The reverse osmosis membrane antiscalant according to claim 1, characterized in that: The preparation method of the reverse osmosis membrane antiscalant comprises the following steps: S1. Prepare raw materials: first measure the weight of each raw material; S2, dissolving and mixing: adding water to a reaction kettle or mixer, adding water-based acrylic resin, stirring at the same time to promote dissolution, the stirring speed is 200-260rpm, gradually adding sodium polyaspartate, polyacrylic acid, and glycine, stirring for 20-30 minutes at a stirring speed of 260-300rpm after each addition of new ingredients to form a mixture; S3. Adjusting pH value: gradually adding citric acid and phytic acid, measuring the pH value of the mixture with a pH meter, and adjusting the pH value to 6.5-7.5 with citric acid and phytic acid; S4. Adding a stabilizing agent: Add the stabilizing agent, stirring at a speed of 260-300 rpm, continue stirring for 60-65 minutes, and mix evenly; S5. Cooling and filtering: After the reaction is completed, the mixture is allowed to cool naturally to room temperature, and the mixture is filtered to remove unreacted particles or impurities.

6. A reverse osmosis membrane antiscalant according to claim 1, characterized in that: In step S2, the reactor or mixer is heated to 42-46°C, and cooled to room temperature for 3-5 hours before step S6.

7. An application of the reverse osmosis membrane antiscalant according to any one of claims 1 to 6, characterized in that: The reverse osmosis membrane antiscalant is added to the water inlet of the reverse osmosis system, and the recommended dosage is 0.1‰-0.5‰ of the water inlet.

Images