Gasifier ash water scale inhibitor and method of making same

Abstract

The present application relates to the technical field of scale inhibition, and proposes a gasifier ash water scale inhibitor and a preparation method thereof.The gasifier ash water scale inhibitor comprises the following components in parts by weight: polycarboxylic acid 22-35 parts, polysulfonate 21-28 parts, phosphate 5-12 parts, phosphonic acid 8-12 parts, azole 3-9 parts, auxiliary agent 22-30 parts, alcohol 15-25 parts, suspending agent 25-30 parts, and water 200-220 parts; the auxiliary agent comprises 2-pyridine carboxylic acid and 6-aminonicotinic acid.Through the above technical solution, the problem of poor scale inhibition performance of the scale inhibitor in the related art is solved.

Description

Technical Field

[0001] This invention relates to the field of scale inhibition technology, specifically to a scale inhibitor for gasifier ash water and its preparation method. Background Technology

[0002] In modern industrial systems, gasifiers play a crucial role, serving as indispensable key equipment in industries such as coal, chemicals, and energy. Their working principle involves a chemical reaction between solid fuels (such as coal) and gasifying agents (such as oxygen and steam) under high temperature and pressure, converting them into syngas. This syngas can then be further used to produce various chemical products such as methanol and synthetic ammonia, or as fuel gas for power generation, playing a fundamental role in energy supply and product manufacturing for industrial production.

[0003] During the operation of a gasifier, the ash water system is a crucial component for maintaining its stable operation. Ash water is primarily composed of ash produced during the gasification reaction, flushing water, and various impurities carried over from the reaction process. Its composition is extremely complex, containing multiple metal ions (such as calcium, magnesium, and iron), aluminosilicates, and other soluble salts. Under the high temperature, high pressure, and specific pH conditions of the gasifier, these complex components readily undergo chemical reactions and crystallize, forming a hard scale layer on the inner walls of the equipment and pipelines.

[0004] For a long time, scale formation in greywater has been a persistent problem, severely hindering the efficient production of related enterprises. While traditional scale inhibitors can alleviate scaling to some extent, their effectiveness is limited when faced with the complex composition and operating conditions of greywater. With rapid industrial development and the continuous expansion of enterprise production scale, the demands for production efficiency are becoming increasingly stringent, making existing scale inhibition technologies increasingly unable to meet the growing production needs.

[0005] The hazards of scale buildup in grey water are multifaceted and extremely serious. From an equipment performance perspective, the presence of scale significantly reduces the heat exchange efficiency of equipment, hindering heat transfer. To maintain the required production temperature, companies are forced to consume more energy, leading to a substantial increase in energy consumption. Simultaneously, the gradual thickening of the scale layer can reduce the inner diameter of pipes, eventually causing blockages. This not only affects the normal transport of grey water but may also trigger safety hazards such as equipment overpressure, and in severe cases, even lead to equipment damage and production shutdowns. Frequent equipment repairs and shutdowns not only incur high maintenance costs but also disrupt the entire production plan, affecting the supply of upstream and downstream products, causing incalculable losses to the company's economic benefits and market reputation.

[0006] In conclusion, it is crucial to develop a scale inhibitor for gasifier ash water that can significantly improve scale inhibition performance. Summary of the Invention

[0007] This invention proposes a scale inhibitor for gasifier ash water and its preparation method, which solves the problem of poor scale inhibition performance of scale inhibitors in related technologies.

[0008] The technical solution of the present invention is as follows:

[0009] This invention proposes a scale inhibitor for gasifier ash water, comprising the following components in parts by weight: 22-35 parts polycarboxylic acid, 21-28 parts polysulfonate, 5-12 parts phosphate, 8-12 parts phosphonic acid, 3-9 parts azole, 22-30 parts additives, 15-25 parts alcohol, 25-30 parts suspending agent, and 200-220 parts water;

[0010] The adjuvants include 2-pyridinecarboxylic acid and 6-aminonicotinic acid.

[0011] As a further technical solution, the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid is 15:7~9.

[0012] In this invention, by adjusting the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid to 15:7~9, the scale inhibition performance of the gasifier ash water scale inhibitor is further improved.

[0013] As a further technical solution, the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid is 15:8.

[0014] In this invention, the scale inhibition performance of the gasifier ash water scale inhibitor was further improved by adjusting the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid to 15:8.

[0015] As a further technical solution, the alcohols include 1,3-cyclohexanediol and 1,2-pentanediol.

[0016] In this invention, a mixed solvent of 1,3-cyclohexanediol and 1,2-pentanediol is used as the alcohol. The 1,3-cyclohexanediol and 1,2-pentanediol have a synergistic effect, forming a denser adsorption film and improving the corrosion inhibition performance of the gasifier ash water scale inhibitor.

[0017] As a further technical solution, the mass ratio of 1,3-cyclohexanediol to 1,2-pentanediol is 2:5~7.

[0018] In this invention, by adjusting the mass ratio of 1,3-cyclohexanediol and 1,2-pentanediol to 2:5~7, the corrosion inhibition performance of the gasifier ash water scale inhibitor is further improved.

[0019] As a further technical solution, the mass ratio of 1,3-cyclohexanediol to 1,2-pentanediol is 1:3.

[0020] In this invention, by adjusting the mass ratio of 1,3-cyclohexanediol and 1,2-pentanediol to 1:3, the corrosion inhibition performance of the gasifier ash water scale inhibitor is further improved.

[0021] As a further technical solution, the polycarboxylic acid includes one of polyaspartic acid, polyacrylic acid, and polymethacrylic acid;

[0022] Polysulfonates include sodium poly(p-styrene sulfonate);

[0023] The suspending agent includes one of polyethylene glycol, polyethylene oxide, and sodium carboxymethyl cellulose.

[0024] As a further technical solution, the phosphate includes one of sodium hexametaphosphate and sodium pyrophosphate;

[0025] The phosphonic acid includes one of ethylenediaminetetramethylenephosphonic acid and aminotrimethylenephosphonic acid;

[0026] The azoles include one of benzotriazole and methyltriazole.

[0027] The present invention also proposes a method for preparing a gasifier ash water scale inhibitor, comprising the following steps: mixing the components evenly to obtain the gasifier ash water scale inhibitor.

[0028] As a further technical solution, the mixing temperature is 25~35℃.

[0029] The working principle and beneficial effects of this invention are as follows:

[0030] 1. In this invention, polycarboxylic acid is added to the scale inhibitor. Polycarboxylic acid has excellent dispersing properties, can adsorb on the surface of various metal ions in grey water, disperse them, and effectively prevent metal ions from combining to form insoluble salt precipitates, thereby inhibiting scale formation. At the same time, it can also disperse existing microscale crystals, preventing them from further agglomerating and growing, and maintaining the cleanliness of the grey water system.

[0031] 2. In this invention, phosphate is added to the scale inhibitor. Phosphate can undergo a complexation reaction with metal ions in the grey water to form stable complexes. These complexes can reduce the concentration of metal ions, decreasing the likelihood of them combining with other anions to form scale. Furthermore, phosphate can also form a protective film on the equipment surface to a certain extent, preventing scale adhesion.

[0032] 3. In this invention, phosphonic acid is added to the scale inhibitor. Phosphonic acid has a strong chelating ability for common scale-forming metal ions such as calcium and magnesium, which can chelate these ions and prevent them from combining with other anions to form scale. At the same time, phosphonic acid can destroy the crystal lattice structure of scale crystals, making it difficult for scale crystals to grow and aggregate, thus playing a good scale inhibition role.

[0033] 4. In this invention, azoles are added to the scale inhibitor. Azoles primarily function as corrosion inhibitors, forming a dense protective film on the surface of metal equipment to prevent corrosive substances in the grey water from corroding the equipment. Simultaneously, they also inhibit the precipitation of some metal ions, helping to reduce scale formation caused by metal corrosion products reacting with the metal.

[0034] 5. In this invention, the additives include 2-pyridinecarboxylic acid and 6-aminonicotinic acid. The two different acids have different selectivity for metal ions in water and can chelate with different metal ions. At the same time, the use of 2-pyridinecarboxylic acid and 6-aminonicotinic acid produces a synergistic effect, which improves the scale inhibition performance of the gasifier ash water scale inhibitor.

[0035] 6. In this invention, alcohols are added to the scale inhibitor. The polar groups contained in the alcohol molecules adsorb onto the metal surface through intermolecular forces, while the hydrophobic nonpolar groups face the medium and aggregate to form an adsorption film, which prevents the metal surface from contacting the outside world, thereby achieving the corrosion inhibition effect.

[0036] 7. In this invention, a suspending agent is added to the scale inhibitor. The suspending agent prevents particles from agglomerating and growing, thus avoiding pipe blockage. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] In the following examples and comparative examples, polyaspartic acid was purchased from Shandong Weiyuan Environmental Protection Technology Co., Ltd., product number P02; sodium poly(p-styrene sulfonate) had a weight-average molecular weight of 80,000; polyacrylic acid had a weight-average molecular weight of 20,000; polymethacrylic acid had a weight-average molecular weight of 80,000; polyethylene glycol was PEG-2000; polyethylene oxide was WSR-205; and sodium carboxymethyl cellulose was FVH9.

[0039] Example 1

[0040] A gasifier ash water scale inhibitor comprises the following components in parts by weight: 35 parts polycarboxylic acid, 28 parts polysulfonate, 12 parts phosphate, 12 parts phosphonic acid, 9 parts azole, 30 parts additives, 25 parts alcohol, 30 parts suspending agent, and 220 parts water.

[0041] The additives include 2-pyridinecarboxylic acid and 6-aminonicotinic acid;

[0042] The mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid is 15:11;

[0043] The alcohol is 1,3-cyclohexanediol;

[0044] The polycarboxylic acid is polyaspartic acid;

[0045] The polysulfonate is sodium poly(p-styrene sulfonate);

[0046] The suspending agent is polyethylene glycol;

[0047] The phosphate is sodium hexametaphosphate;

[0048] Phosphonic acid is ethylenediaminetetramethylenephosphonic acid;

[0049] The azole is benzotriazole;

[0050] The preparation method of the gasifier ash water scale inhibitor includes the following steps: mixing each component evenly at 35°C to obtain the gasifier ash water scale inhibitor.

[0051] Example 2

[0052] A gasifier ash water scale inhibitor comprises the following components in parts by weight: 22 parts polycarboxylic acid, 21 parts polysulfonate, 5 parts phosphate, 8 parts phosphonic acid, 3 parts azole, 22 parts additives, 15 parts alcohol, 25 parts suspending agent, and 200 parts water.

[0053] The additives include 2-pyridinecarboxylic acid and 6-aminonicotinic acid;

[0054] The mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid is 3:1;

[0055] The alcohol is 1,3-cyclohexanediol;

[0056] Polycarboxylic acid is polyacrylic acid;

[0057] The polysulfonate is sodium poly(p-styrene sulfonate);

[0058] The suspending agent is polyethylene oxide;

[0059] The phosphate is sodium pyrophosphate;

[0060] Phosphonic acid is aminotrimethylphosphonic acid;

[0061] The azole is methylbenztriazole;

[0062] The preparation method of the gasifier ash water scale inhibitor includes the following steps: mixing the components evenly at 25°C to obtain the gasifier ash water scale inhibitor.

[0063] Example 3

[0064] A gasifier ash water scale inhibitor comprises the following components in parts by weight: 25 parts polycarboxylic acid, 27 parts polysulfonate, 9 parts phosphate, 9 parts phosphonic acid, 6 parts azole, 27 parts additives, 20 parts alcohol, 28 parts suspending agent, and 210 parts water.

[0065] The additives include 2-pyridinecarboxylic acid and 6-aminonicotinic acid;

[0066] The mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid is 3:2;

[0067] The alcohol is 1,3-cyclohexanediol;

[0068] The polycarboxylic acid is polymethacrylic acid;

[0069] The polysulfonate is sodium poly(p-styrene sulfonate);

[0070] The suspending agent is sodium carboxymethyl cellulose;

[0071] The phosphate is sodium hexametaphosphate;

[0072] Phosphonic acid is ethylenediaminetetramethylenephosphonic acid;

[0073] The azole is benzotriazole;

[0074] The preparation method of the gasifier ash water scale inhibitor includes the following steps: mixing the components evenly at 30°C to obtain the gasifier ash water scale inhibitor.

[0075] Example 4

[0076] The only difference between this embodiment and Embodiment 3 is that the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid in this embodiment is 5:2.

[0077] Example 5

[0078] The only difference between this embodiment and Embodiment 3 is that the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid in this embodiment is 15:7.

[0079] Example 6

[0080] The only difference between this embodiment and Embodiment 3 is that the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid in this embodiment is 15:8.

[0081] Example 7

[0082] The only difference between this embodiment and Embodiment 3 is that the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid in this embodiment is 5:3.

[0083] Example 8

[0084] The only difference between this embodiment and Embodiment 3 is that the alcohol in this embodiment is 1,2-pentanediol.

[0085] Example 9

[0086] The only difference between this embodiment and Example 3 is that in this embodiment, the alcohol is a mixed solvent of 1,3-cyclohexanediol and 1,2-pentanediol, and the mass ratio of 1,3-cyclohexanediol to 1,2-pentanediol is 1:2.

[0087] Example 10

[0088] The only difference between this embodiment and Embodiment 8 is that the mass ratio of 1,3-cyclohexanediol and 1,2-pentanediol in this embodiment is 1:4.

[0089] Example 11

[0090] The only difference between this embodiment and Embodiment 8 is that the mass ratio of 1,3-cyclohexanediol and 1,2-pentanediol in this embodiment is 2:5.

[0091] Example 12

[0092] The only difference between this embodiment and Embodiment 8 is that the mass ratio of 1,3-cyclohexanediol and 1,2-pentanediol in this embodiment is 1:3.

[0093] Example 13

[0094] The only difference between this embodiment and Embodiment 8 is that the mass ratio of 1,3-cyclohexanediol to 1,2-pentanediol in this embodiment is 2:7.

[0095] Comparative Example 1

[0096] The only difference between this comparative example and Example 2 is that the additive in this comparative example is 2-pyridinecarboxylic acid.

[0097] Comparative Example 2

[0098] The only difference between this comparative example and Example 2 is that the additive in this comparative example is 6-aminonicotinic acid.

[0099] Comparative Example 3

[0100] The only difference between this comparative example and Example 2 is that no additives were added in this comparative example.

[0101] Experimental Example 1

[0102] The scale inhibitors for gasifier ash water prepared in Examples 1-7 and Comparative Examples 1-3 were tested for scale inhibition performance according to the method in GB / T 16632-2019 "Determination of Scale Inhibition Performance of Water Treatment Machines - Calcium Carbonate Deposition Method". The experimental water temperature was 80℃, and the experimental dosage of the scale inhibitor for gasifier ash water was 30mg / L. The test results are shown in Table 1.

[0103] Table 1 Scale inhibition performance test results

[0104]

[0105] Comparing Example 2 with Comparative Examples 1-3, it is shown that the synergistic effect of 2-pyridinecarboxylic acid and 6-aminonicotinic acid in the present invention improves the scale inhibition performance of the gasifier ash water scale inhibitor.

[0106] Comparing Examples 5-7 with Examples 3-4, it is shown that when the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid is 15:7-9, the scale inhibition performance of the gasifier ash water scale inhibitor is further improved.

[0107] Experimental Example 2

[0108] The scale inhibitors for gasifier ash water prepared in Examples 3 and 8-13 were tested for corrosion inhibition performance according to the method in GB / T 18175-2014 "Determination of Corrosion Inhibition Performance of Water Treatment Agents - Rotary Coating Method". The experimental water temperature was 80℃, the rotation speed was 75r / min, the running time was 72h, and the experimental dosage of the scale inhibitor for gasifier ash water was 30mg / L. The test results are shown in Table 2.

[0109] Table 2 Corrosion Inhibition Performance Test Results

[0110]

[0111] Comparing Examples 9-13 with Examples 3 and 8, it is demonstrated that the synergistic effect of 1,3-cyclohexanediol and 1,2-pentanediol in this invention improves the corrosion inhibition properties of the gasifier ash water scale inhibitor. Comparing Examples 11-13 with Examples 9-10, it is demonstrated that a mass ratio of 1,3-cyclohexanediol to 1,2-pentanediol of 2:5-7 further improves the corrosion inhibition properties of the gasifier ash water scale inhibitor.

[0112] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gasifier ash water scale inhibitor characterized by, It includes the following components in parts by weight: 22-35 parts polycarboxylic acid, 21-28 parts polysulfonate, 5-12 parts phosphate, 8-12 parts phosphonic acid, 3-9 parts azoles, 22-30 parts additives, 15-25 parts alcohols, 25-30 parts suspending agent, and 200-220 parts water. The adjuvants include 2-pyridinecarboxylic acid and 6-aminonicotinic acid; the mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid is 15:7~9; The alcohols include 1,3-cyclohexanediol and 1,2-pentanediol; The mass ratio of 1,3-cyclohexanediol to 1,2-pentanediol is 2:5~7.

2. A gasifier ash water scale inhibitor according to claim 1, wherein, The mass ratio of 2-pyridinecarboxylic acid to 6-aminonicotinic acid is 15:

8.

3. The ash water scale inhibitor for a gasifier according to claim 1, wherein The mass ratio of 1,3-cyclohexanediol to 1,2-pentanediol is 1:

3.

4. The ash water scale inhibitor for a gasifier according to claim 1, wherein The polycarboxylic acid includes one of polyaspartic acid, polyacrylic acid, and polymethacrylic acid. Polysulfonates include sodium poly(p-styrene sulfonate); The suspending agent includes one of polyethylene glycol, polyethylene oxide, and sodium carboxymethyl cellulose.

5. The ash water scale inhibitor for a gasifier according to claim 1, wherein The phosphate includes one of sodium hexametaphosphate and sodium pyrophosphate; The phosphonic acid includes one of ethylenediaminetetramethylenephosphonic acid and aminotrimethylenephosphonic acid; The azoles include one of benzotriazole and methyltriazole.

6. The method according to any one of claims 1 to 5, wherein the gasifier ash water scale inhibitor is prepared by the steps of: Includes the following steps: The components are mixed evenly to obtain a gasifier ash water scale inhibitor.

7. The method for preparing a gasifier ash water scale inhibitor according to claim 6, characterized in that, The mixing temperature is 25~35℃.

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