Reverse osmosis scale inhibitor as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of scale inhibitors, and particularly relates to a reverse osmosis scale inhibitor as well as a preparation method and application thereof. The invention provides a reverse osmosis scale inhibitor, which is prepared from the following components in percentage by mass: 18 to 25 percent of HEDP (1-hydroxyethylidene-1, 1-diphosphonic acid), 5 to 10 percent of 1, 2, 4-tricarboxylic acid-2-phosphonobutane (PBTCA), 2 to 10 percent of AA-AMPS-HPA terpolymer and the balance of water. The reverse osmosis scale inhibitor provided by the invention is ionized after being dissolved in water, electronegative molecular chains are generated through ionization, and the electronegative molecular chains and Ca < 2 + > form a water-soluble complex or chelate, so that the solubility of inorganic salt is increased, normal growth of inorganic salt crystals is hindered and damaged, the growth rate of the crystals is slowed down, and the scale inhibitor can be used for scale inhibition. Therefore, the formation of salt scale is reduced, and the scale inhibition effect is achieved. The reverse osmosis scale inhibitor provided by the invention has relatively high scale inhibition efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of scale inhibitors, and particularly relates to a reverse osmosis scale inhibitor, a preparation method thereof, and an application thereof. Background Art

[0002] With the progress of membrane science and technology, reverse osmosis water treatment technology has been widely applied in the fields of electric power, food, electronics, and chemical industry, and also has a wide range of applications in the deep treatment of industrial water supply and sewage reuse. During the long-term operation of reverse osmosis equipment, due to the relatively high concentration of various ions in the concentrated water, scale is likely to be generated, and bacteria and algae are likely to breed, resulting in membrane blockage and affecting the stable operation of the reverse osmosis system. Membrane scaling and the growth of bacteria and algae can reduce the water production rate of the equipment and cause energy waste. In severe cases, the membrane elements need to be replaced. Membrane elements are the main components of the reverse osmosis system and are expensive. Therefore, preventing membrane scaling plays a crucial role in reverse osmosis operation. At present, the phenomenon of scaling in the reverse osmosis process is mainly slowed down by using reverse osmosis scale inhibitors, but the scale inhibition efficiency of existing reverse osmosis scale inhibitors is only 70-80%. Summary of the Invention

[0003] In view of this, the present invention provides a reverse osmosis scale inhibitor, a preparation method thereof, and an application thereof. The reverse osmosis scale inhibitor provided by the present invention has a high scale inhibition efficiency. The reverse osmosis scale inhibitor provided by the present invention can increase the solubility of inorganic salts, hinder and destroy the normal growth of inorganic salt crystals, slow down the crystal growth rate, and thus reduce the formation of salt scale.

[0004] In order to solve the above technical problems, the present invention provides a reverse osmosis scale inhibitor, which comprises the following components in mass percentage:

[0005]

[0006] Preferably, it comprises the following components in mass percentage:

[0007]

[0008]

[0009] The present invention also provides a preparation method of the reverse osmosis scale inhibitor according to the above technical solution, which comprises the following steps:

[0010] Mix hydroxyethane diphosphonic acid, AA-AMPS-HPA terpolymer, 2-phosphonobutane-1,2,4-tricarboxylic acid and water to obtain the reverse osmosis scale inhibitor.

[0011] Preferably, the mixing comprises the following steps:

[0012] First, dissolve hydroxyethane diphosphonic acid and the AA-AMPS-HPA terpolymer in water to obtain a first solution;

[0013] Second, dissolve 2-phosphonobutane-1,2,4-tricarboxylic acid in the first solution to obtain the reverse osmosis scale inhibitor.

[0014] Preferably, the first dissolution is carried out under stirring, the stirring speed is 70 - 90 r / min, and the stirring time is 0.5 - 2 h.

[0015] Preferably, the second dissolution is carried out under stirring, the stirring speed is 75 - 90 r / min, and the stirring time is 1.5 - 3 h.

[0016] The present invention also provides the application of the reverse osmosis scale inhibitor described in the above technical solution or the reverse osmosis scale inhibitor prepared by the preparation method described in the above technical solution in a reverse osmosis system.

[0017] The present invention provides a reverse osmosis scale inhibitor, which comprises the following components in mass percentage: 8 - 25% hydroxyethane diphosphonic acid, 5 - 10% 2-phosphonobutane-1,2,4-tricarboxylic acid, 2 - 10% AA-AMPS-HPA terpolymer and the balance of water. After the AA-AMPS-HPA terpolymer (carboxylic acid-sulfonic acid-acrylate terpolymer) in the reverse osmosis scale inhibitor provided by the present invention is dissolved in water, it ionizes to generate a negatively charged molecular chain, which forms a water-soluble complex or chelate with Ca 2+ to increase the solubility of inorganic salts, hinder and destroy the normal growth of inorganic salt crystals, slow down the crystal growth rate, and thus reduce the formation of scale to play a scale inhibition role. The reverse osmosis scale inhibitor provided by the present invention has a high scale inhibition efficiency. Specific Embodiments

[0018] The present invention provides a reverse osmosis scale inhibitor, which comprises the following components in mass percentage:

[0019]

[0020]

[0021] In the present invention, all raw materials are conventional commercially available products if not otherwise specified.

[0022] In the present invention, based on mass percentage, the reverse osmosis antiscalant comprises 18-25% of hydroxyethane diphosphonic acid, preferably 20-22%. In the present invention, the hydroxyethane diphosphonic acid (HEDP) can form stable complexes with various metal ions such as iron, copper, and zinc, can dissolve the oxides on the metal surface, and remains stable at high pH values, is not easily hydrolyzed, and is not easily decomposed under general light and heat conditions.

[0023] In the present invention, based on mass percentage, the reverse osmosis antiscalant comprises 5-10% of 2-phosphonobutane-1,2,4-tricarboxylic acid, preferably 8-9%. In the present invention, the phosphate group (PO4) in the 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) -3 can form stable complexes with metal ions, thereby preventing the precipitation and scaling of metal ions on the membrane surface; in addition, PBTCA has the ability to prevent the formation of water scale, especially has good antiscaling effects on silicate and calcium salts, and can effectively prevent the formation of water scale or cause membrane scaling. It can be applied to use within the range of pH value of 7.0-9.5, and also has good antiscaling performance under the conditions of high hardness and high alkalinity.

[0024] In the present invention, based on mass percentage, the reverse osmosis antiscalant comprises 2-10% of AA-AMPS-HPA terpolymer, preferably 4-6%. In the present invention, the AA-AMPS-HPA terpolymer is a new type of polyelectrolyte antiscalant and dispersant containing multiple functional groups. Since the molecular chain of the copolymer contains strong acid, weak acid and non-ionic groups at the same time, this product has a high calcium tolerance under the conditions of high temperature, high pH, high hardness and high alkalinity, and has excellent inhibitory effects and dispersing properties on the deposition of dirt such as calcium carbonate, calcium phosphate, zinc scale, iron oxide and sediment in water.

[0025] In the present invention, based on mass percentage, the reverse osmosis antiscalant comprises the balance of water. In the present invention, the water is preferably distilled water.

[0026] The present invention also provides a preparation method of the reverse osmosis antiscalant according to the above technical solution, comprising the following steps:

[0027] Mix hydroxyethane diphosphonic acid, AA-AMPS-HPA terpolymer, 2-phosphonobutane-1,2,4-tricarboxylic acid and water to obtain the reverse osmosis antiscalant.

[0028] In the present invention, the mixing preferably comprises the following steps:

[0029] First dissolve hydroxyethane diphosphonic acid and AA-AMPS-HPA terpolymer in water to obtain a first solution;

[0030] Dissolve 2-phosphonobutane-1,2,4-tricarboxylic acid in the first solution to obtain an anti-scaling agent for reverse osmosis.

[0031] In the present invention, the first dissolution is preferably carried out under stirring, and the rotation speed of the stirring is preferably 70 - 90 r / min, more preferably 75 - 80 r / min; the stirring time is preferably 0.5 - 2 h, more preferably 1 - 1.5 h.

[0032] In the present invention, the second dissolution is preferably carried out under stirring, and the rotation speed of the stirring is preferably 75 - 90 r / min, more preferably 80 - 85 r / min; the stirring time is preferably 1.5 - 3 h, more preferably 2 - 2.5 h.

[0033] In the present invention, the sum of the stirring time of the first dissolution and the stirring time of the second dissolution is preferably 2 - 3 h, more preferably 2.5 h.

[0034] The present invention also provides the application of the anti-scaling agent for reverse osmosis described in the above technical solution or the anti-scaling agent prepared by the preparation method described in the above technical solution in a reverse osmosis system. In the present invention, various mixtures cooperate with each other, and under high hardness and high alkalinity conditions, they complex with Ca 2+ , Mg 2+ , Si 4+ and other plasma to play a good anti-scaling ability.

[0035] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below in conjunction with examples, but they cannot be understood as limiting the protection scope of the present invention.

[0036] The present invention does not limit the weight of the raw material dosage in the embodiments, as long as the required mass percentage content can be achieved.

[0037] Example 1

[0038] Dissolve hydroxyethane diphosphonic acid, AA-AMPS-HPA terpolymer and distilled water under stirring at a rotation speed of 80 r / min for 1 h to obtain a first solution;

[0039] Dissolve 2-phosphonobutane-1,2,4-tricarboxylic acid in the first solution under stirring at a rotation speed of 85 r / min for 2 h to obtain an anti-scaling agent for reverse osmosis, wherein the mass concentration of hydroxyethane diphosphonic acid is 22%, the mass concentration of AA-AMPS-HPA terpolymer is 6%, and the mass concentration of 2-phosphonobutane-1,2,4-tricarboxylic acid is 9%.

[0040] Example 2

[0041] The reverse osmosis scale inhibitor was prepared according to the method of Example 1, except that the mass concentration of hydroxyethane diphosphonic acid was 25%, the AA-AMPS-HPA terpolymer was 4%, and the mass concentration of 2-phosphonobutane-1,2,4-tricarboxylic acid was 10%.

[0042] Comparative Example 1

[0043] The reverse osmosis scale inhibitor was prepared according to the method of Example 1, except that the mass concentration of hydroxyethane diphosphonic acid was 25%, the AA-AMPS-HPA terpolymer was 10%, and the mass concentration of 2-phosphonobutane-1,2,4-tricarboxylic acid was 0.

[0044] Comparative Example 2

[0045] The reverse osmosis scale inhibitor was prepared according to the method of Example 1, except that the mass concentration of hydroxyethane diphosphonic acid was 0, the AA-AMPS-HPA terpolymer was 8%, and the mass concentration of 2-phosphonobutane-1,2,4-tricarboxylic acid was 15%.

[0046] Using water with a calcium ion concentration of 260 mg / L, a dioxysilicon concentration of 50 mg / L, and a pH value of 8.2 as the test object, the scale inhibition performance of the reverse osmosis scale inhibitor prepared in Example 1 was detected; after adding 3 mg / L of the reverse osmosis scale inhibitor prepared in Example 1 to the test water and stirring evenly, its scale inhibition effect was measured; the scale inhibition rates of calcium and silicon dioxide were both 97.5%.

[0047] Using water with a calcium ion concentration of 280 mg / L, a dioxysilicon concentration of 60 mg / L, and a pH value of 8.3 as the test object, the scale inhibition performance of the reverse osmosis scale inhibitor prepared in Example 2 was detected; after adding 5 mg / L of the reverse osmosis scale inhibitor prepared in Example 2 to the test water and stirring evenly, its scale inhibition effect was measured; the scale inhibition rates of calcium and silicon dioxide were both 98.9%.

[0048] Using water with a calcium ion concentration of 340 mg / L, a dioxysilicon concentration of 90 mg / L, and a pH value of 8.3 as the test object, the scale inhibition performance of the reverse osmosis scale inhibitor prepared in Comparative Example 1 was detected; after adding 5 mg / L of the reverse osmosis scale inhibitor prepared in Comparative Example 1 to the test water and stirring evenly, its scale inhibition effect was measured; the scale inhibition rates of calcium and silicon dioxide were both 82%.

[0049] Using water with a calcium ion concentration of 420 mg / L, a dioxysilicon concentration of 110 mg / L, and a pH value of 8.5 as the test object, the scale inhibition performance of the reverse osmosis scale inhibitor prepared in Comparative Example 2 was detected; after adding 5 mg / L of the reverse osmosis scale inhibitor prepared in Comparative Example 2 to the test water and stirring evenly, its scale inhibition effect was measured; the scale inhibition rates of calcium and silicon dioxide were both 69%.

[0050] From the above test results, it can be seen that the reverse osmosis scale inhibitor provided by the present invention has good corrosion and scale inhibition effects.

[0051] Although the above embodiments have described the present invention in detail, they are only a part of the embodiments of the present invention, rather than all embodiments. People can also obtain other embodiments based on these embodiments without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. An anti-scaling agent for reverse osmosis, characterized in that, Comprising components with the following mass percentages:

2. The reverse osmosis scale inhibitor according to claim 1, characterized in that, Comprising components with the following mass percentages:

3. The preparation method of the reverse osmosis scale inhibitor according to claim 1 or 2, comprising the following steps: Mix hydroxyethane diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, AA-AMPS-HPA terpolymer and water to obtain the reverse osmosis scale inhibitor.

4. The preparation method according to claim 3, characterized in that, The mixing comprises the following steps: First dissolve hydroxyethane diphosphonic acid and AA-AMPS-HPA terpolymer in water to obtain a first solution; Second dissolve 2-phosphonobutane-1,2,4-tricarboxylic acid in the first solution to obtain the reverse osmosis scale inhibitor.

5. The preparation method according to claim 4, characterized in that, The first dissolution is carried out under stirring, the stirring speed is 70-90 r / min, and the stirring time is 0.5-2 h.

6. According to the preparation method described in claim 4, characterized in that, The second dissolution is carried out under stirring, the stirring speed is 75-90 r / min, and the stirring time is 1.5-3 h.

7. The application of the reverse osmosis scale inhibitor according to claim 1 or 2 or the reverse osmosis scale inhibitor prepared by the preparation method according to any one of claims 3-6 in a reverse osmosis system.

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