Circulating water corrosion and scale inhibitor, preparation and evaluation method

Abstract

The application provides a circulating water corrosion and scale inhibitor, a preparation method and an evaluation method. The inhibitor is prepared from the following raw materials in parts by weight: 10-25 parts of polyepoxysuccinic acid, 5-15 parts of sodium polystyrene sulfonate, 10-25 parts of zinc chloride, 8-15 parts of alkylphenol polyoxyethylene ether, 10-25 parts of hydrolyzed maleic anhydride, 3-8 parts of imidazoline quaternary ammonium salt and 30-50 parts of deionized water. The corrosion and scale inhibitor has good scale inhibition and corrosion inhibition effects, can effectively prevent the scaling and corrosion of heat exchangers and pipelines during the operation of equipment pipelines after the concentration of industrial circulating water, and achieves the effect of water saving.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, specifically to a circulating water corrosion and scale inhibitor, its preparation and evaluation method. Background Technology

[0002] Industrial circulating water is mainly used in cooling water systems, hence the name circulating cooling water. Since industrial cooling water accounts for over 90% of total water consumption, water conservation is of paramount importance. The application of scale inhibitors in circulating water treatment plays a crucial role in water conservation, energy saving, ensuring the safe and stable operation of production equipment, and addressing the global water crisis. However, conventional corrosion and scale inhibitors contain organophosphates, which are key components in their synergistic effect. This results in high levels of organophosphates in the circulating water. Direct discharge of such water would pollute the environment, necessitating treatment before discharge, which is costly and complex.

[0003] Therefore, it is both necessary and urgent to research and develop a high-precision circulating water corrosion and scale inhibitor to prevent scaling and corrosion of heat exchangers and pipelines in equipment pipelines after industrial circulating water concentration during operation, while simultaneously achieving water conservation.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The primary objective of this invention is to provide a corrosion and scale inhibitor for circulating water. This corrosion and scale inhibitor has excellent scale inhibition and corrosion inhibition effects, and can effectively prevent scale and corrosion of heat exchangers and pipelines in equipment pipelines after industrial circulating water concentration during operation, while achieving water-saving effects.

[0006] The second objective of this invention is to provide a method for preparing the above-mentioned circulating water corrosion and scale inhibitor, which is simple, energy-efficient, and can effectively reduce costs.

[0007] The third objective of this invention is to provide an evaluation method for the above-mentioned circulating water corrosion and scale inhibitors, which is simple and has clear standards.

[0008] To achieve the above-mentioned objectives of this invention, the following technical solution is adopted:

[0009] A circulating water corrosion and scale inhibitor is mainly prepared from the following raw materials, in parts by weight: 10-25 parts of polyepoxysuccinic acid, 5-15 parts of sodium polystyrene sulfonate, 10-25 parts of zinc chloride, 8-15 parts of alkylphenol polyoxyethylene ether, 10-25 parts of hydrolyzed maleic anhydride, 3-8 parts of imidazoline quaternary ammonium salt, and 30-50 parts of deionized water.

[0010] Preferably, as a further specific embodiment, the mixture comprises 12-20 parts of polyepoxysuccinic acid, 7-11 parts of sodium polystyrene sulfonate, 15-20 parts of zinc chloride, 10-13 parts of alkylphenol polyoxyethylene ether, 12-20 parts of hydrolyzed maleic anhydride, 4-7 parts of imidazoline quaternary ammonium salt, and 35-45 parts of deionized water.

[0011] Preferably, as a further specific embodiment, the mixture comprises 15 parts of polyepoxysuccinic acid, 10 parts of sodium polystyrene sulfonate, 18 parts of zinc chloride, 12 parts of alkylphenol polyoxyethylene ether, 18 parts of hydrolyzed maleic anhydride, 5 parts of imidazoline quaternary ammonium salt, and 40 parts of deionized water.

[0012] The epoxy succinic acid used in this invention has some active groups that have a certain chelating force on scale-forming cations, which can block some scale-forming cations and inhibit their reaction with anions, thereby preventing scaling.

[0013] The sodium polystyrene sulfonate used in this invention is a water-soluble polymer with unique properties. Compared with other sulfonic acid compounds, it has extremely low toxicity, high water solubility, good anionic electrolytic activation, and strong flocculation ability. It can be used in synergy with epoxy succinic acid to play a role in corrosion inhibition and scale removal.

[0014] The hydrolyzed maleic anhydride used in this invention is itself a scale inhibitor, but when combined with zinc salt, it can increase its scale inhibition effect and effectively prevent the corrosion of carbon steel. In addition to using zinc salt in combination with hydrolyzed maleic anhydride, this invention increases the ability to remove dirt.

[0015] The imidazoline quaternary ammonium salt used in this invention is a high-performance surfactant containing both anionic and cationic groups in its molecule, making it a modified and balanced amphoteric surfactant. It is mild in nature, possessing excellent detergency, foaming, and emulsifying properties, especially characterized by extremely low toxicity, minimal irritation to skin and eyes, excellent foaming ability, superior emulsifying properties, and good biodegradability. Alkylphenol polyoxyethylene ether is an important polyoxyethylene-type nonionic surfactant, characterized by its stability, acid and alkali resistance, and low cost. Both surfactants and non-surfactants can activate the scale surface, enabling epoxy succinic acid and sodium polystyrene sulfonate to thoroughly clean the scale and reduce corrosion of the cleaned equipment.

[0016] This invention also provides a method for preparing a corrosion and scale inhibitor for circulating water, comprising:

[0017] The product is obtained by sequentially mixing and stirring polyepoxysuccinic acid, sodium polystyrene sulfonate, zinc chloride, alkylphenol polyoxyethylene ether, hydrolyzed maleic anhydride, imidazoline quaternary ammonium salt, and deionized water.

[0018] Preferably, as a further specific embodiment, in the step of sequentially mixing and stirring polyepoxysuccinic acid, sodium polystyrene sulfonate, zinc chloride, alkylphenol polyoxyethylene ether, hydrolyzed maleic anhydride, imidazoline quaternary ammonium salt and deionized water, the temperature of this step is controlled at 15℃-35℃.

[0019] Preferably, as a further specific embodiment, the stirring time is 120 min-125 min.

[0020] Preferably, as a further specific embodiment, the stirring speed is 60 r / min-90 r / min.

[0021] This invention also provides a method for evaluating corrosion and scale inhibitors in circulating water, comprising:

[0022] Take a sample of circulating water from the site or prepare a sample of water, heat it to 80℃-85℃, and keep it at that temperature until a large amount of scale appears in the container to obtain the experimental water sample.

[0023] The prepared corrosion and scale inhibitor was added to the experimental water sample and stirred at a stirring rate of 60 r / min-65 r / min for 30 s-35 s. The sample was then allowed to stand, and the time from the addition of the corrosion and scale inhibitor to the complete disappearance of the scale was observed and recorded.

[0024] After the scale completely disappeared, the experimental water sample with added corrosion and scale inhibitor was reheated to 80℃-85℃. The sample was observed every 24 hours, and the time from when the scale completely disappeared to when it reappeared was recorded.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The high-precision circulating water corrosion and scale inhibitor of this invention contains polymer suspended particles that form an electric double layer in water. Through electrostatic interaction, the particles repel each other, preventing them from colliding and growing, thus stabilizing the tiny particles in the water and achieving scale inhibition and dispersion. The covalent and coordination bonds formed in the corrosion inhibitor combine with metal ions, alternating to form chain polymers, forming an insoluble protective film on the metal surface, thereby inhibiting metal corrosion. At the same time, the synergist has an excellent complexing effect on metal ions in water, and has a corrosion inhibition and enhancement effect on carbon steel. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0028] Example 1

[0029] This embodiment provides a circulating water corrosion and scale inhibitor, which comprises the following raw materials in parts by weight: 10g polyepoxysuccinic acid, 5g sodium polystyrene sulfonate, 10g zinc chloride, 8g alkylphenol polyoxyethylene ether, 10g hydrolyzed maleic anhydride, 3g imidazoline quaternary ammonium salt, and 30g deionized water.

[0030] The preparation method of the above-mentioned wax remover includes the following steps:

[0031] 10g of polyepoxysuccinic acid, 5g of sodium polystyrene sulfonate, 10g of zinc chloride, 8g of alkylphenol polyoxyethylene ether, 10g of hydrolyzed maleic anhydride, 3g of imidazoline quaternary ammonium salt and 30g of deionized water were placed into a reaction vessel in sequence and stirred at 60r / min for 120min at 15℃.

[0032] Example 2

[0033] This embodiment provides a circulating water corrosion and scale inhibitor, which comprises the following raw materials in parts by weight: 12g polyepoxysuccinic acid, 7g sodium polystyrene sulfonate, 15g zinc chloride, 10g alkylphenol polyoxyethylene ether, 12g hydrolyzed maleic anhydride, 4g imidazoline quaternary ammonium salt, and 35g deionized water.

[0034] The preparation method of the above-mentioned wax remover includes the following steps:

[0035] 12g of polyepoxysuccinic acid, 7g of sodium polystyrene sulfonate, 15g of zinc chloride, 10g of alkylphenol polyoxyethylene ether, 12g of hydrolyzed maleic anhydride, 4g of imidazoline quaternary ammonium salt and 35g of deionized water were placed into a reaction vessel in sequence and stirred at 90r / min for 125min at 35℃.

[0036] Example 3

[0037] This embodiment provides a circulating water corrosion and scale inhibitor, which comprises the following raw materials in parts by weight: 15g polyepoxysuccinic acid, 10g sodium polystyrene sulfonate, 18g zinc chloride, 12g alkylphenol polyoxyethylene ether, 18g hydrolyzed maleic anhydride, 5g imidazoline quaternary ammonium salt, and 40g deionized water.

[0038] The preparation method of the above-mentioned wax remover includes the following steps:

[0039] 15g of polyepoxysuccinic acid, 10g of sodium polystyrene sulfonate, 18g of zinc chloride, 12g of alkylphenol polyoxyethylene ether, 18g of hydrolyzed maleic anhydride, 5g of imidazoline quaternary ammonium salt and 40g of deionized water were placed into a reaction vessel in sequence and stirred at 90r / min for 120min at 25℃.

[0040] Example 4

[0041] The specific implementation method is the same as in Example 3, except that the mass of each component is changed to: 20g of polyepoxysuccinic acid, 11g of sodium polystyrene sulfonate, 20g of zinc chloride, 13g of alkylphenol polyoxyethylene ether, 20g of hydrolyzed maleic anhydride, 5g of imidazoline quaternary ammonium salt, and 45g of deionized water.

[0042] Example 5

[0043] The specific implementation method is the same as in Example 3, except that the mass of each component is changed to: 25g of epoxy succinic acid, 15g of sodium polystyrene sulfonate, 25g of zinc chloride, 15g of alkylphenol polyoxyethylene ether, 25g of hydrolyzed maleic anhydride, 8g of imidazoline quaternary ammonium salt, and 50g of deionized water.

[0044] Comparative Example 1

[0045] The specific implementation method is the same as in Example 3, except that the mass of epoxy succinic acid is changed to 5g.

[0046] Comparative Example 2

[0047] The specific implementation method is the same as in Example 3, except that the mass of epoxy succinic acid is changed to 30g.

[0048] Comparative Example 3

[0049] The specific implementation method is the same as in Example 3, except that the mass of sodium polystyrene sulfonate is changed to 2g.

[0050] Comparative Example 4

[0051] The specific implementation method is the same as in Example 3, except that the mass of sodium polystyrene sulfonate is changed to 20g.

[0052] Comparative Example 5

[0053] The specific implementation method is the same as in Example 3, except that the mass of zinc chloride is changed to 5g.

[0054] Comparative Example 6

[0055] The specific implementation method is the same as in Example 3, except that the mass of zinc chloride is changed to 30g.

[0056] Comparative Example 7

[0057] The specific implementation method is the same as in Example 3, except that the mass of alkylphenol polyoxyethylene ether is changed to 7g.

[0058] Comparative Example 8

[0059] The specific implementation method is the same as in Example 3, except that the mass of alkylphenol polyoxyethylene ether is changed to 20g.

[0060] Comparative Example 9

[0061] The specific implementation method is the same as in Example 3, except that the mass of hydrolyzed maleic anhydride is changed to 10g.

[0062] Comparative Example 10

[0063] The specific implementation method is the same as in Example 3, except that the mass of hydrolyzed maleic anhydride is changed to 25g.

[0064] Comparative Example 11

[0065] The specific implementation method is the same as in Example 3, except that the mass of imidazoline quaternary ammonium salt is changed to 2g.

[0066] Comparative Example 12

[0067] The specific implementation method is the same as in Example 3, except that the mass of imidazoline quaternary ammonium salt is changed to 11g.

[0068] Experimental Example 1

[0069] Take a 1L sample of circulating water from the site or prepare a water sample using a container. The container should be a straight cylindrical container with an inner radius of 10cm. Heat the container containing the water sample to 80℃ and keep it warm until a large amount of scale appears in the container. This will give you the experimental water sample.

[0070] The corrosion and scale inhibitors prepared in Examples 1-5 and Comparative Examples 1-12 were added to a container. The container was stirred at a constant speed for 30 seconds (60 r / min) using a stirring device, and then allowed to stand. The time from the addition of the agent to the complete disappearance of the scale was observed and recorded. After the scale completely disappeared, the container was placed back in an oven and heated to 80°C and kept at that temperature. The container was observed every 24 hours, and the time from the complete disappearance of the scale to the reappearance of scale was recorded.

[0071] The scale inhibition rate of the high-efficiency and environmentally friendly corrosion and scale inhibitors in each example and comparative example was tested according to GB / T16632-2008 "Determination of scale inhibition performance of water treatment agents - calcium carbonate deposition method".

[0072] The corrosion rates of the corrosion and scale inhibitors in each example and comparative example were determined according to GB / T18175-2014 "Determination of Corrosion Inhibition Performance of Water Treatment Agents - Rotary Coating Method".

[0073] Table 1. Corrosion rates of corrosion and scale inhibitors in the examples and comparative examples.

[0074]

[0075] Based on the above data, the following conclusions can be drawn:

[0076] Examples 1-5 demonstrate that the circulating water corrosion and scale inhibitor prepared by the formulation and preparation method of the present invention has good scale removal, scale inhibition, and corrosion reduction capabilities. Comparative Examples 1-12 show that when the proportions of the components are outside the range selected in the present invention, the various physical properties are relatively poor.

[0077] Comparative Examples 3 and 1-12 show that when the content of epoxy succinic acid is low, it is difficult to remove scale. However, when the content is excessive, it has a solubility limit effect on the deposition of scale such as calcium sulfate. Its scale inhibition rate increases with the increase of the dosage. When a certain concentration is reached, the scale inhibition ability no longer increases significantly.

[0078] When the content of sodium polystyrene sulfonate is low, its descaling and corrosion-inhibiting effects are reduced, while when the content is excessive, it makes it difficult for tiny particles to remain stable in water, thus reducing the dispersing effect.

[0079] Imidazoline quaternary ammonium salts and alkylphenol polyoxyethylene ethers, as surfactants, can significantly reduce the interfacial tension between water and other substances, producing effects such as wetting or dewetting, emulsification or demulsification, foaming or defoaming, and solubilization. When the content is too low, the effect is insufficient, leading to a decrease in physical properties; while when the content is excessive, some surfactant molecules cannot come into contact with water, so these surfactants do not function at all.

[0080] Hydrolyzed maleic anhydride needs to be used in conjunction with zinc chloride. If one component is in excess or in small amounts, it will affect the function of the other component, resulting in a decrease in descaling ability.

[0081] In summary, when the various substances are in the proportions set in this invention, i.e., by weight: 10-25 parts polyepoxysuccinic acid, 5-15 parts sodium polystyrene sulfonate, 10-25 parts zinc chloride, 8-15 parts alkylphenol polyoxyethylene ether, 10-25 parts hydrolyzed maleic anhydride, 3-8 parts imidazoline quaternary ammonium salt, and 30-50 parts deionized water, this corrosion and scale inhibitor has excellent scale and corrosion inhibition effects. It can effectively prevent scale and corrosion of heat exchangers and pipelines in equipment pipelines after industrial circulating water concentration during operation, while achieving water-saving effects.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circulating water corrosion and scale inhibitor, characterized in that, It is mainly made from the following raw materials, in parts by weight: 15 parts of polyepoxysuccinic acid, 10 parts of sodium polystyrene sulfonate, 18 parts of zinc chloride, 12 parts of alkylphenol polyoxyethylene ether, 18 parts of hydrolyzed maleic anhydride, 5 parts of imidazoline quaternary ammonium salt and 40 parts of deionized water.

2. A method for preparing the circulating water corrosion and scale inhibitor as described in claim 1, characterized in that, Includes the following steps: The product is obtained by sequentially mixing and stirring polyepoxysuccinic acid, sodium polystyrene sulfonate, zinc chloride, alkylphenol polyoxyethylene ether, hydrolyzed maleic anhydride, imidazoline quaternary ammonium salt, and deionized water.

3. The method for preparing the circulating water corrosion and scale inhibitor according to claim 2, characterized in that, In the step of sequentially mixing and stirring polyepoxysuccinic acid, sodium polystyrene sulfonate, zinc chloride, alkylphenol polyoxyethylene ether, hydrolyzed maleic anhydride, imidazoline quaternary ammonium salt, and deionized water, the temperature of this step is controlled between 15℃ and 35℃.

4. The preparation method of the circulating water corrosion and scale inhibitor according to claim 2, characterized in that, The stirring time is 120-125 minutes.

5. The method for preparing the circulating water corrosion and scale inhibitor according to claim 2, characterized in that, The stirring speed is 60 r / min-90 r / min.

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