A method for rapidly dissolving inorganic scale using neutral descaling and unclogging techniques and its application.

Abstract

This invention discloses a method for preparing and applying a neutral descaling agent that rapidly dissolves inorganic scale. It provides a method for rapidly dissolving various inorganic scales formed in surface water treatment metal pipelines, the inner and outer walls of mechanical and chemical equipment, oil and water wells in oil and gas extraction, and various gathering and transportation pipelines, across various industrial fields such as industrial water treatment, machinery and chemical industry, and oil and gas extraction. The neutral descaling agent of this invention is near-neutral and can rapidly dissolve various common industrial inorganic scales (such as calcium magnesium carbonate, barium strontium sulfate, calcium sulfate, ferrous sulfide, calcium silicate, etc.). It has a wide field application temperature range (0℃-200℃), extremely low corrosiveness to various metal pipes, biodegradability, and extremely low environmental pollution. This invention uses edible mangosteen and small molecule aldehydes as main raw materials to prepare a neutral descaling agent that rapidly dissolves various inorganic scales. This invention can be applied to multiple industrial fields such as industrial water treatment, machinery and chemical industry, petrochemical industry, and mechanical and electronic industry, and can rapidly dissolve various insoluble inorganic scales.

Description

Technical Field

[0001] This invention relates to the fields of industrial water treatment, mechanical and chemical engineering, and oil and gas extraction, especially to the field of cleaning and treatment technology for various insoluble inorganic scales involved in surface industrial water treatment pipelines and oil and gas extraction processes, and particularly to a method for preparing and applying a neutral descaling agent that can rapidly dissolve inorganic scale. Background Technology

[0002] Currently, in common industrial water treatment, machinery and chemical industry, oil and gas extraction, and petrochemical industry, the water quality often contains various metal ions such as calcium. 2+ Mg 2+ Ba 2+ Fe 3+ and various anions such as CO3 2- SO4 2- SiO3 2- When the water quality composition, pH, and on-site operating conditions such as temperature and pressure inside the gathering and transmission pipeline change, the alteration of solubility product often leads to the precipitation of various inorganic scales such as calcium carbonate and barium sulfate. These scales slowly accumulate on the inner wall of the pipeline, eventually forming hard, insoluble inorganic scales. In industrial production processes, the inorganic scales formed mainly include various insoluble solids such as calcium carbonate, calcium sulfate, barium sulfate, calcium silicate, and ferrous sulfide.

[0003] The formation of various inorganic scales can make on-site operating conditions difficult and significantly reduce fluid delivery rates. If inorganic scale forms on metal surfaces, downhole equipment, or the inner walls of metal containers, it can easily cause blockages in metal pipelines, heat exchangers, evaporators, separators, coils, and other equipment over time, affecting normal production processes. In severe cases, it can cause mechanical containers, various industrial equipment, and pipelines to stop operating, resulting in serious economic losses. In such cases, cleaning treatment to remove blockages and scale is necessary. Currently, acid washing is the primary method used for descaling and unclogging in industrial water treatment and petrochemical industries. Acid washing is the most widely used method for descaling inorganic scale such as calcium carbonate and magnesium carbonate, with its main advantages being rapid reaction speed and reduced construction time. However, acid washing also presents several problems: acids are highly corrosive, causing severe corrosion to metal pipelines and shortening equipment lifespan; acids are hazardous chemicals, posing significant safety hazards during transportation, storage, and use; and post-treatment is required according to safety and environmental protection requirements, increasing production costs. Furthermore, acid washing is ineffective against inorganic scale such as barium sulfate and strontium sulfate, which are poorly soluble in strong acids and alkalis. For these poorly soluble inorganic scales, chemical chelation is currently the main method used, but this method is slow, especially at low temperatures (such as 25°C), often requiring several days or even weeks for descaling, significantly impacting the production cycle; additionally, the chelation products are unstable and often redeposit.

[0004] Common inorganic scale removers have the following problems: 1) Poor universality: A single scale remover is often targeted at a certain type of inorganic scale and often cannot meet the requirements for removing various types of inorganic scale at the same time; 2) Inability to meet requirements at low temperatures: Under low temperature conditions (such as 25℃), various scale removers react slowly and the construction time is long, which cannot meet the needs of on-site construction; 3) Strong corrosiveness: Whether it is a strong acid or a strong alkali, it will cause severe corrosion to the surface of metal materials.

[0005] Therefore, developing a neutral descaling agent that can quickly remove inorganic scale with universal descaling properties, fast scale dissolution at low temperatures, low corrosivity, environmental friendliness, and simple and convenient production process is of great practical significance for solving the scaling problems in industrial water treatment and oil and gas fields.

[0006] This invention produces a green and environmentally friendly neutral descaling agent that rapidly dissolves inorganic scale by using raw materials such as edible mangosteen, small molecule aldehydes, alkalis, acid-base regulators, penetrants, and deionized water. Summary of the Invention

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A neutral descaling agent for rapidly dissolving inorganic scale, said neutral descaling agent being composed of the following raw materials by weight percentage: Eat 5-30 servings of mangosteen Pectinase 0.01-0.25 parts, 5-20 parts of small molecule aldehydes 1-10 parts alkali 1-5 parts of acid-base regulator Penetrating dispersant 0.01-0.5 parts 30-80 parts deionized water The pH value of the neutral unclogging and descaling agent is in the range of 6-8.

[0008] The edible mangosteens mentioned include: oil bamboo, sand bamboo, flower bamboo, and yellow-toothed mangosteen, etc. They contain various components such as xanthracene, ketones, polyphenols, hydroxycitric acid, and tannic acid, which can effectively chelate various high-valence metal ions.

[0009] The small molecule aldehydes include: C1-C5 small molecule aldehydes (such as formaldehyde, acetaldehyde, glyoxal, etc.) And unsaturated aldehydes (such as benzaldehyde, acrolein, etc.). Among the above-mentioned C1-C5 small molecule aldehydes, glyoxal is preferred.

[0010] The base includes: inorganic bases and organic bases, such as sodium hydroxide, potassium hydroxide, monoethanolamine, and diethanolamine. Ethanolamine, triethanolamine, etc. Among the various bases mentioned above, potassium hydroxide is preferred.

[0011] The neutral descaling and unclogging agent uses acid-base regulators including weak acids, weak acid salts, and weak acid-weak base salts, such as NH4Cl, NH3·H2O, NaHCO3, and Na2CO3.

[0012] The penetrating dispersant is a compound of anionic and nonionic surfactants and a dispersant. Specifically, sodium dodecyl sulfate (SDS) is used as the anionic penetrating agent, fatty alcohol polyoxyethylene ether (AOE) is used as the nonionic penetrating agent, and sodium tripolyphosphate is used as the dispersant. The sodium dodecyl sulfate (SDS), nonionic fatty alcohol polyoxyethylene ether (AOE), and sodium tripolyphosphate are formulated in a weight ratio of 1:1:1.

[0013] The preparation method of the neutral descaling agent for rapidly dissolving inorganic scale includes the following steps: 1) Sort and crush the edible mangosteens. After the crushing rate reaches more than 95%, add them to the reaction vessel. Soak them at 80℃ for 12 hours, then cool them down to 35℃ and stir continuously for more than 2 hours. 2) Add pectinase and yeast to the reaction vessel, soak at room temperature and stir continuously for 24 hours, and filter the peel residue to obtain edible mangosteen extract solution. 3) Continue to add small molecule aldehydes, bases, and acid-base regulators to the reactor to control the pH value of the system between 6 and 8; 4) Slowly add a certain proportion of penetrating dispersant to the reactor and stir continuously until homogeneous; 5) Let stand, filter to remove impurities, and obtain the neutral unclogging and descaling agent of the present invention.

[0014] Compared with the prior art, the present invention has the following advantages: 1) Rapidly dissolves various sparingly soluble inorganic scales under neutral conditions (such as calcium carbonate, calcium sulfate, barium strontium sulfate, etc.); 2) Wide application temperature range (0℃-200℃), saving construction time and costs, especially suitable for winter construction; 3) Low corrosivity and environmentally friendly; 4) The production process is simple and on-site construction is convenient. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the preparation process of the neutral descaling agent for rapidly dissolving inorganic scale according to the present invention; Figure 2 The present invention describes the cleaning effect of a neutral descaling agent for rapidly dissolving inorganic scale on calcium carbonate scale, barium sulfate scale, and calcium silicate scale (25℃, 80℃, 6h). Figure 3 The effect of different cleaning times on the calcium carbonate scale removal rate of the neutral unclogging and descaling agent for rapidly dissolving inorganic scale of the present invention at 25°C; Figure 4 Evaluation of the corrosiveness of the neutral unclogging and descaling agent of this invention to different metal pipes (25℃, 50℃). Detailed Implementation

[0016] This invention discloses a method for preparing and applying a neutral descaling agent that rapidly dissolves insoluble inorganic scale formed inside ground pipelines and various facilities and equipment in the fields of industrial water treatment, petrochemicals, and mechanical chemicals.

[0017] The neutral descaling agent for rapidly dissolving inorganic scale of the present invention is composed of the following raw materials in parts by weight: Eat 5-30 servings of mangosteen Pectinase 0.01-0.25 parts, 5-20 parts of small molecule aldehydes 1-10 parts alkali 1-5 parts of acid-base regulator Penetrating dispersant 0.01-0.5 parts 30-80 parts deionized water The pH value of the neutral unclogging and descaling agent is in the range of 6-8.

[0018] The key technology of this invention, a neutral descaling agent for rapidly dissolving inorganic scale, lies in: (1) Edible mangosteen is selected as the main component of the descaling agent, which can dissolve various insoluble inorganic scales (such as barium strontium sulfate, calcium magnesium carbonate, calcium sulfate, silicates, etc.) within a neutral range; (2) Mangosteen contains various components such as xanthracene, ketones, polyphenols, hydroxycitric acid, and tannic acid, which can quickly chelate various high-valence metal ions and react with high-valence metal cations such as Ca in inorganic scale. 2+ , Mg2+ Ba 2+ 、Sr 2+ Fe 3+ They form water-soluble metal ligands, thereby improving the solubility of insoluble inorganic scale; (3) Small molecule aldehydes have a synergistic effect with various active ingredients in edible mangosteen, and at the same time have a bactericidal and preservative effect. (4) Acid-base regulators can adjust the acid-base range of descaling agents to adapt to different types of inorganic scale cleaning; (5) The penetrating stabilizer can penetrate into the internal pores of the insoluble inorganic scale, accelerate the cleaning efficiency of the cleaning agent, and at the same time prevent the high-valence metal cations in the formed metal ligands from being released again, prevent the dissolved particles from colliding with each other and reforming the precipitate, and ensure the long-term stability of the system.

[0019] Significant effects of the present invention: 1. Rapidly dissolves various sparingly soluble inorganic scales under neutral conditions (such as calcium carbonate, calcium sulfate, barium strontium sulfate, etc.); 2. Wide application temperature range (0℃-200℃), saving construction time and costs, especially suitable for winter construction; 3. Low corrosivity and environmentally friendly; 4. The production process is simple and on-site construction is convenient.

[0020] The specific formulation and preparation process of this invention are described in detail below: The neutral descaling agent for rapidly dissolving inorganic scale of the present invention is composed of the following raw materials in parts by weight: Eat 5-30 servings of mangosteen Pectinase 0.01-0.25 parts, 5-20 parts of small molecule aldehydes 1-10 parts alkali 1-5 parts of acid-base regulator Penetrating dispersant 0.01-0.5 parts 30-80 parts deionized water The pH value of the neutral unclogging and descaling agent is in the range of 6-8.

[0021] The edible mangosteens include oil bamboo, sand bamboo, flower bamboo, yellow tooth mangosteen, etc., with oil bamboo being the preferred variety.

[0022] The small molecule aldehydes are C1-C5 small molecule aldehydes (such as formaldehyde, acetaldehyde, glyoxal, etc.) and unsaturated aldehydes. Aldehydes (such as benzaldehyde, acrolein, etc.). Among the above-mentioned C1-C5 small molecule aldehydes, glyoxal is preferred.

[0023] The base is an inorganic base or an organic base, such as sodium hydroxide, potassium hydroxide, monoethanolamine, or diethanolamine. Ethanolamine, triethanolamine, etc. Among the various bases mentioned above, potassium hydroxide is preferred.

[0024] The specific composition of the penetrating dispersant is: 1) Anionic surfactant: Sodium dodecyl sulfate; 2) Nonionic surfactant: fatty alcohol polyoxyethylene ether; 3) Dispersant: Sodium tripolyphosphate.

[0025] The three ingredients are mixed in a 1:1:1 mass ratio.

[0026] Sodium dodecyl sulfate (SDS) can solubilize various high-valence metal cations in water, such as Ca. 2+ Mg 2+ Ba 2+ 、Sr 2+ Fe 3 Fatty alcohol polyoxyethylene ether (AEO) can alter the wettability of insoluble inorganic scale on metal surfaces; the two work together to achieve synergistic effects in penetration, detergency, and solubilization. Sodium tripolyphosphate is selected as the dispersant, which can stabilize the formed metal cationic ligands and has low toxicity and biodegradability.

[0027] The main ingredient is edible mangosteen processing liquid, which contains various components such as xanthracene, ketones, polyphenols, hydroxycitric acid, and tannic acid, and can effectively chelate various high-valence metal cations such as Ca. 2+ Mg 2+ Ba 2+ 、Sr 2+ Fe 3 Small molecule aldehydes have a synergistic effect with edible mangosteen, and also have corrosion-inhibiting and bactericidal properties. Acid-base regulators can adjust the pH range of the descaling agent, keeping the pH between 6.0 and 8.0, thus reducing corrosion to metal surfaces. Penetration stabilizers facilitate the rapid penetration of components into the pores of dense inorganic scale, greatly accelerating the exchange rate of various water-soluble ions while preventing the re-aggregation of coordination products.

[0028] The preparation process of the neutral descaling agent for rapidly dissolving inorganic scale of the present invention: 1) Sort and crush the edible mangosteens. After the crushing rate reaches more than 95%, add them to the reaction vessel. Soak them at 80℃ for 12 hours, then cool them down to 35℃ and stir continuously for more than 2 hours. 2) Add pectinase and yeast to the reaction vessel, soak at room temperature and stir continuously for 24 hours, and filter the peel residue to obtain edible mangosteen extract solution. 3) Continue to add small molecule aldehydes, bases, and acid-base regulators to the reactor to control the pH value of the system between 6 and 8; 4) Slowly add a certain proportion of penetrating dispersant to the reactor and stir continuously until homogeneous; 5) Let stand, filter to remove impurities, and obtain the neutral unclogging and descaling agent of the present invention.

[0029] The cleaning mechanism of the neutral descaling agent for rapidly dissolving inorganic scale of the present invention is as follows: This method uses an immersion process to treat edible mangosteen, which, through enzymatic action, forms various chemical substances including xanthracene, ketones, polyphenols, hydroxycitric acid, and tannic acid. Under suitable pH conditions, these substances can react with Ca... 2+ Mg 2+ Ba 2+ 、Sr 2+ Fe 3+ High-valence metal ions form chelates.

[0030] These formed chemical components can undergo various coordination interactions. Specific mechanisms include: 1) The generated acidic components such as hydroxycitric acid and tannic acid adsorb high-valence metal cations such as Ca through electrostatic interactions. 2+ Mg 2+ Ba 2+ 、Sr 2+ Fe 3+ And so on, forming stable ligands; 2) The generated xanthracene, ketones, polyphenols and other chemical components, through hydroxyl, aldehyde, ketone and heteroatoms such as oxygen and nitrogen, form stable complexes with high-valence metal ions and ligands, which further enhance water solubility; 3) The formed ester groups are hydrolyzed to form carboxyl and hydroxyl groups, which crosslink with high-valence metal ions, increasing the solubility of the product.

[0031] The added penetrating dispersant further improves the cleaning performance of the neutral descaling agent by altering the oil-water wettability of solid inorganic scale on the metal surface.

[0032] Compared with traditional acidic or alkaline inorganic scale cleaning agents, this preparation method is simple to operate and easy to scale up for industrial production.

[0033] Performance evaluation of neutral descaling agent that rapidly dissolves inorganic scale The performance evaluation of the neutral unclogging and descaling agent for rapidly dissolving inorganic scale of this invention includes evaluation of cleaning efficiency, cleaning time, and corrosivity.

[0034] 1. Cleaning efficiency Weigh 2.0g of inorganic scale including calcium carbonate, barium sulfate, and calcium silicate. Place the sample in 100.0g of the neutral descaling agent solution of this invention (preparation method: mix 50.0g of cleaning agent stock solution with 50.0g of tap water). Place the sample in ovens at different temperatures (25℃ and 80℃) and let it stand for 6 hours each time. After filtration, weigh the remaining scale sample. m If the value is 0, the calculation method for the cleaning rate of a neutral unclogging and descaling agent under static conditions is as follows: W =(2 - m 0) / 2×100% in, W -Inorganic scale removal rate, % m The weight of the remaining scale sample after 0-4 hours, in grams.

[0035] The results of the cleaning efficiency of the neutral unclogging and descaling agent of this invention on calcium carbonate scale, barium sulfate scale, and calcium silicate scale under different temperatures (25℃, 80℃) and 6h conditions are shown in the appendix. Figure 2 From the appendix Figure 2 It is evident that the cleaning efficiency of the neutral descaling agent of this invention for calcium carbonate, barium sulfate, and calcium silicate scale increases with increasing temperature. Specifically, at 25℃ and 50℃, the cleaning efficiency for calcium carbonate scale increases from 94.0% to 99.5%, for barium sulfate scale from 81.0% to 85.5%, and for calcium silicate scale from 80.5% to 82.0%. At 25℃, the cleaning efficiency for all types of inorganic scale is above 80%; at 80℃, the cleaning efficiency for all types of inorganic scale is above 82%. Especially for calcium and magnesium carbonate inorganic scale, the cleaning efficiency reaches 94% at 25℃, fully meeting the requirements for on-site construction under normal temperature conditions.

[0036] 2. Cleaning time Weigh 2.0g of inorganic scale such as calcium carbonate or barium sulfate, place the sample in 100.0g of the neutral descaling agent of this invention (preparation method: mix 50.0g of cleaning agent stock solution with 50.0g of tap water), and place it in an oven at 25°C for 2h, 4h, 6h, and 8h. After filtration, weigh the remaining scale sample. m 0, calculated according to the cleaning rate formula in the cleaning efficiency under static conditions.

[0037] The results of the change in the cleaning rate of calcium carbonate scale by the neutral unclogging and descaling agent of the present invention at 25°C with cleaning time are shown in the appendix. Figure 3 From the appendix Figure 3 It can be seen that under the condition of 25℃, the cleaning rate of calcium carbonate is significantly improved with the extension of cleaning time, and the cleaning rate rapidly increases from 65.5% after 2 hours to 98.5% after 8 hours.

[0038] 3. Corrosion evaluation of different metal materials Mix 5g of neutral descaling and unblocking agent stock solution with 95g of tap water to prepare a 5% neutral descaling and unblocking agent solution. Place metal hangers made of commonly used industrial pipe materials such as J55, N80, 316SS, and P110 into the prepared solution, seal the container, and place it in an oven at test temperatures of 25℃ and 50℃ (representing the temperature of the medium water inside common pipelines and various equipment), allowing it to stand for 48 hours (the specific standing time depends on the actual construction time on site, generally 4-48 hours). The corrosion evaluation results for various materials are attached. Figure 4 .

[0039] From the appendix Figure 4 It can be seen that for different metal materials (J55, N80, 316SS, P110), as the temperature increases, the corrosion rate increases slightly from 0.021 mm / a to 0.023 mm / a (J55) and from 0.018 mm / a to 0.019 mm / a (N80). The corrosion rates of 316SS and P110 materials remain unchanged at 0.011 mm / a and 0.013 mm / a, respectively. Therefore, the neutral descaling and unblocking agent of this specification exhibits corrosion rates significantly lower than the requirement of no more than 0.076 mm / a for surface sewage treatment, indicating extremely low corrosivity to various pipe materials.

[0040] Application Examples of Neutral De-scaling Agents for Rapidly Dissolving Inorganic Scale When the neutral descaling agent for rapidly dissolving inorganic scale of the present invention is used for pipeline cleaning, descaling, and deblocking in fields such as industrial water treatment and oil and gas extraction, the specific implementation method can be determined according to the actual site conditions.

[0041] Example 1: Cleaning of inorganic scale from industrial water treatment floor pipelines (at room temperature of 25°C) For various inorganic scales in industrial water treatment ground pipelines, the following method can be used: First, drain the sewage in the pipeline to be treated; prepare a neutral descaling agent solution (e.g., 10% or 15%, the specific concentration to be used depends on the actual situation on site) in the ground mixing tank, generally 20% of the total treatment liquid volume, which is 1.2 times the volume of the pipeline; inject the prepared treatment liquid from one end of the pipeline until the pipeline is filled with the descaling agent solution, then close the valves at both ends of the pipeline and let it stand for 4-6 hours; rinse the pipeline with clean water and resume production.

[0042] Example 2: Cleaning of inorganic scale in oil and water wells during oil and gas field development (taking an oil reservoir temperature of 80°C as an example) For the removal of inorganic scale inside oil and water wells in oil and gas field development, the specific implementation method is as follows: A circulating pool and injection pump are connected to the surface pipeline via high-pressure hoses. A neutral descaling and unblocking agent solution (e.g., 5-15% treatment solution, the specific concentration and dosage determined based on actual site conditions) is prepared in the surface mixing tank according to construction requirements. The prepared treatment solution is injected through the oil and annulus and returned to the surface circulating pool via the oil pipe, ensuring the treatment solution fills the entire process. The circulating pump is started, allowing the cleaning treatment solution to flow rapidly throughout the process. The circulation is maintained for approximately 2-74 hours, then the pump is stopped. Clean water is used to replace the residual treatment solution in the entire process, and then production can be resumed.

[0043] By adopting the above-disclosed technical solution of this invention, the following beneficial effects are obtained: 1) Rapidly dissolves various sparingly soluble inorganic scales under neutral conditions (such as calcium carbonate, calcium sulfate, barium strontium sulfate, etc.); 2) Wide application temperature range (0℃-200℃), saving construction time and costs, especially suitable for winter construction; 3) Low corrosivity and environmentally friendly; 4) The production process is simple and on-site construction is convenient.

[0044] This invention uses edible mangosteen and compound aldehydes as main raw materials to prepare a neutral descaling agent that rapidly dissolves various inorganic scales. This invention can be applied to multiple industrial fields such as industrial water treatment, machinery and chemical engineering, petrochemicals, and electronics, and can rapidly dissolve various insoluble inorganic scales.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A preparation method and application of a quick-dissolving inorganic scale neutral plug-breaking and scale-removing agent, characterized in that, The neutral unclogging and descaling agent is composed of the following raw materials in the indicated weight ratios: Eat 5-30 servings of mangosteen Pectinase 0.01-0.25 parts, 5-20 parts of small molecule aldehydes 1-10 parts alkali 1-5 parts of acid-base regulator Penetrating dispersant 0.01-0.5 parts 30-80 parts deionized water The pH value of the neutral unclogging and descaling agent is in the range of 6-8.

2. The neutral cleanup scale and deposit remover of claim 1, wherein, The selected raw material is edible mangosteen, including but not limited to oil bamboo, sand bamboo, flower bamboo, and yellow tooth mangosteen.

3. The neutral scale remover of claim 1, wherein, The small molecule aldehydes used include: small molecule aldehydes (such as formaldehyde, acetaldehyde, glyoxal, etc.) and unsaturated aldehydes (such as benzaldehyde and acrolein), with glyoxal being the optimal choice.

4. The neutral cleanup scale and deposit remover of claim 1 wherein The alkalis used include: Among various inorganic and organic bases, such as sodium hydroxide, potassium hydroxide, monoethanolamine, diethanolamine, and triethanolamine, potassium hydroxide is the optimal choice.

5. The neutral cleanup scale and deposit remover of claim 1 wherein The acid-base adjusters used include: Weak acids, weak acid salts, weak acid-weak base salts, such as NH4Cl, NH3·H2O, NaHCO3, Na2CO3, etc.

6. The neutral descaling agent according to claim 1, characterized in that, The penetrating dispersant is a compound of anionic and nonionic surfactants and a dispersant. The anionic penetrating agent is sodium dodecyl sulfate (SDS), the nonionic penetrating agent is fatty alcohol polyoxyethylene ether (AOE), and the dispersant is sodium tripolyphosphate. The sodium dodecyl sulfate (SDS), nonionic alcohol polyoxyethylene ether (AOE), and sodium tripolyphosphate are formulated in a weight ratio of 1:1:

1.

7. The method for preparing the neutral unclogging and descaling agent according to any one of claims 1-6, characterized in that... Includes the following steps: Edible mangosteens are sorted and crushed, and after the crushing rate reaches more than 95%, they are added to the reaction vessel; they are hot-soaked at 80℃ for 12 hours, and then cooled to 35℃ and stirred continuously for more than 2 hours. Pectinase and yeast were added to the reaction vessel, and the mixture was soaked at room temperature with continuous stirring for 24 hours. The peel residue was filtered to obtain an edible mangosteen extract solution. Continue to add small molecule aldehydes, bases, and acid-base regulators to the reaction vessel to control the pH value of the system between 6 and 8. A certain proportion of penetrating dispersant is slowly added to the reactor and continuously stirred until homogeneous; After standing and filtering to remove impurities, the neutral unclogging and descaling agent of the present invention is obtained.

8. A method for preparing and applying a neutral descaling agent for rapidly dissolving inorganic scale according to any one of claims 1 to 7, characterized in that: Used to remove various inorganic scales in the range of 0 to 200°C.

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