Triazine desulfurizer and preparation method thereof

Abstract

The invention discloses a triazine desulfurizer and a preparation method thereof, and belongs to the technical field of gas purification. The triazine desulfurizer is mainly prepared from the following raw materials in percentage by weight: 20 to 50 weight percent of triazine derivative, 10 to 15 weight percent of sterically hindered amine, 3 to 7 weight percent of stabilizer, 1 to 3 weight percent of synergist, 0.5 to 1.5 weight percent of penetrant, 0.5 to 1.5 weight percent of inhibitor, 1 to 2 weight percent of additive and the balance of water, the preparation method of the triazine derivative comprises the following steps: adding 2-(diphenylphosphino) ethylamine into a toluene solvent, adding a paraformaldehyde aqueous solution in batches under a stirring condition, and reacting for 2-8 hours to obtain the triazine derivative. According to the triazine desulfurizer and the preparation method thereof provided by the invention, the triazine derivative and the sterically hindered amine are taken as a host, and the stabilizer, the synergist, the penetrant, the inhibitor and the assistant are compounded, so that the scaling trend of the triazine desulfurizer in an oil and gas well can be slowed down, the dissolution rate of hydrogen sulfide and the mass transfer rate in a solution are increased, and the desulfurization reaction is promoted; the desulfurization effect and the desulfurization rate are improved, and meanwhile, a very good scale inhibition effect is also achieved.

Description

Technical Field

[0001] This invention relates to the field of gas purification technology, specifically to a triazine-based desulfurizing agent and its preparation method. Background Technology

[0002] Hydrogen sulfide (H2S) is a highly hazardous gas in oil and gas field production, possessing extreme toxicity and corrosiveness to equipment. It not only threatens the lives of workers but also reduces the service life of pipelines and storage tanks, creating potential production hazards. Currently, the more mature desulfurization methods are mainly dry desulfurization and wet desulfurization. Dry desulfurization is often used to treat low-sulfur gases for fine gas desulfurization; however, it is an intermittent process, requiring replacement of the desulfurizing agent after sulfur saturation, thus limiting its application. Wet desulfurization technology uses liquid desulfurizing agents to directly absorb H2S in oil and gas fields. It has advantages such as high efficiency and the ability to be injected into pipelines, and is widely used for H2S removal in oil and gas fields.

[0003] Triazine-based desulfurizers, used in wet desulfurization processes, commonly refer to 1,3,5-tris(2-hydroxyethyl)-1,3,5-triazine, a product obtained through the condensation reaction of ethanolamine and formaldehyde. In application, triazine aqueous solutions are typically used, exhibiting significant advantages in reaction rate and selectivity with H2S compared to other liquid desulfurizers. Furthermore, the reaction product is water-soluble, exhibiting low toxicity and biodegradability. Therefore, triazine-based desulfurizers are economical, safe, efficient, and environmentally friendly. The strong electron-withdrawing effect of nitrogen atoms in the molecular structure of triazine-based desulfurizers makes the carbon atoms on the triazine ring electrophilic. When the nitrogen atom is protonated, the electrophilicity of the carbon atoms on the ring is enhanced, promoting increased nucleophilic reactivity with H2S. This structural property makes triazine an excellent H2S desulfurizer. This desulfurizer exhibits a fast H2S absorption rate, high sulfur capacity, and high selectivity for hydrogen sulfide in crude oil.

[0004] Existing patent CN117701295A discloses a triazine desulfurizing agent, its preparation method, and its application. The triazine desulfurizing agent is prepared from the following raw materials in parts by weight: 80-100 parts of a triazine ring main body, 10-12 parts of peracetic acid, 2-6 parts of additives, 1-3 parts of a nonionic surfactant, and 1-2 parts of auxiliaries. This invention introduces polyalkoxy groups onto the triazine ring main body and then combines the triazine ring main body, additives, and peracetic acid. The polyalkoxy groups increase the compatibility between the triazine ring and crude oil, allowing it to fully contact sulfur-containing substances in the crude oil. Furthermore, the triazine ring main body and additives can remove hydrogen sulfide, while peracetic acid further improves the desulfurization rate of the iron salt and the triazine ring main body. Simultaneously, peracetic acid can oxidize benzothiophene in the crude oil, converting it into easily removable small molecules, thereby reducing the sulfur content in the crude oil.

[0005] However, during the continuous removal of hydrogen sulfide, triazine-based desulfurizers tend to produce a large amount of water-insoluble and organic solvent-insoluble precipitates with high melting points that are difficult to remove. These precipitates can easily clog pipelines, affecting pipeline transportation efficiency and safety. Such phenomena are more common in oil and gas wells with high H2S content or high temperatures, which affects the application of triazine-based desulfurizers. Summary of the Invention

[0006] The purpose of this invention is to provide a triazine-based desulfurizer and its preparation method, which solves the problem that triazine-based desulfurizers are prone to precipitation during the desulfurization process.

[0007] This invention is achieved through the following technical solution:

[0008] This invention provides a triazine-based desulfurizer, which is prepared mainly from the following raw materials in weight percentages:

[0009] 20–50 wt% triazine derivative, 10–15 wt% hindered amine, 3–7 wt% stabilizer, 1–3 wt% synergist, 0.5–1.5 wt% penetrant, 0.5–1.5 wt% inhibitor, and 1–2 wt% adjuvant, with the remainder being water;

[0010] The preparation of the triazine derivative includes:

[0011] 2-(diphenylphosphino)ethylamine was added to toluene solvent, and paraformaldehyde aqueous solution was added in batches under stirring conditions. The reaction was carried out for 2-8 hours to obtain the triazine derivative.

[0012] Furthermore, in the aforementioned triazine desulfurizer, the sterically hindered amine comprises: dimethylaminoethanol and 2-(4-((2-methylbutyl)amino)phenyl)ethanol in a mass ratio of 1:(0.3-0.6).

[0013] Furthermore, in the preparation of the triazine desulfurizer, the molar ratio of 2-(diphenylphosphino)ethylamine to paraformaldehyde is (1.2-1.5):1.

[0014] Furthermore, in the aforementioned triazine desulfurizing agent, the stirring rate is 400-600 r / min, and the reaction temperature is 30-60℃.

[0015] Furthermore, in the aforementioned triazine desulfurizing agent, the stabilizer comprises one or more of the following: tea polyphenols, hydroquinone, naphthalene polyphenols, p-hydroxyanisole, thiodipropionic acid, and diethylhydroxylamine.

[0016] Furthermore, in the aforementioned triazine desulfurizing agent, the synergist includes one or more of piperazine, N-methyldiethanolamine, and sulfolane.

[0017] Furthermore, in the aforementioned triazine desulfurizing agent, the penetrant includes sodium succinate sulfonate or sodium hydroxyethyl sulfonate.

[0018] Furthermore, in the aforementioned triazine desulfurizing agent, the auxiliary agent includes one or more of triethylamine, diethylamine, and sodium hydroxide.

[0019] Furthermore, in the aforementioned triazine desulfurizing agent, the inhibitor includes ethoxylated tristyrylphenol or ethoxylated nonylphenol.

[0020] The present invention also provides a method for preparing the above-mentioned triazine desulfurizer, the method comprising:

[0021] The triazine derivative, hindered amine, and water are mixed and stirred evenly. Then, stabilizers, synergists, penetrants, inhibitors, and adjuvants are added. The mixture is stirred at 30–50°C for 20–50 minutes to obtain the triazine desulfurizer.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. The triazine desulfurizing agent and its preparation method provided by the present invention, with triazine derivatives and hindered amines as the main components, and compounded with stabilizers, synergists, penetrants, inhibitors and adjuvants, can slow down the scaling tendency of triazine desulfurizing agents in oil and gas wells, increase the dissolution rate of hydrogen sulfide and the mass transfer rate in the solution, promote the desulfurization reaction, improve the desulfurization effect and desulfurization rate, and also have a good scale inhibition effect.

[0024] 2. The triazine desulfurizer and its preparation method provided by this invention synthesize triazine derivatives through 2-(diphenylphosphino)ethylamine and paraformaldehyde. This increases the compatibility between the triazine derivatives and crude oil, allowing for sufficient contact between the triazine derivatives and sulfur-containing substances in the crude oil, thereby further improving the desulfurization rate. In the synthesis, paraformaldehyde acts as a reaction solvent, lowering the freezing point of the triazine derivatives, reducing viscosity, preventing polymerization, and promoting the high-quality synthesis of the desulfurizer.

[0025] 3. The triazine desulfurizer and its preparation method provided by this invention utilize the fact that dimethylaminoethanol, a sterically hindered amine, achieves more satisfactory selective absorption at a relatively high concentration, while 2-(4-((2-methylbutyl)amino)phenyl)ethanol exhibits satisfactory absorption selectivity at a relatively low concentration. By using dimethylaminoethanol and 2-(4-((2-methylbutyl)amino)phenyl)ethanol synergistically, the selective absorption of hydrogen sulfide by the triazine desulfurizer is further improved.

[0026] 4. The triazine desulfurizer and its preparation method provided by the present invention utilize the benzene ring of 2-(4-((2-methylbutyl)amino)phenyl)ethanol in the sterically hindered amine as a heterocyclic ring, which can form a large π bond. Its high-density electron cloud can be adsorbed onto the equipment surface to form a film-forming complex and film, which can reduce the corrosion of the equipment by acid.

[0027] 5. The triazine desulfurizer and its preparation method provided by this invention, by adding stabilizers, synergists, inhibitors and additives, reduces the surface tension of the system, increases the compatibility of the triazine desulfurizer with crude oil, and improves desulfurization efficiency. Inhibitors reduce the degradation of triazine derivatives and decrease the scaling rate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The illustrative embodiments and descriptions of this invention are for explanation only and are not intended to limit the invention. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0029] The technical solution of this invention is as follows:

[0030] This invention provides a triazine-based desulfurizer, which is prepared mainly from the following raw materials in weight percentages:

[0031] 20–50 wt% triazine derivative, 10–15 wt% hindered amine, 3–7 wt% stabilizer, 1–3 wt% synergist, 0.5–1.5 wt% penetrant, 0.5–1.5 wt% inhibitor, and 1–2 wt% adjuvant, with the remainder being water;

[0032] The preparation of the triazine derivative includes:

[0033] 2-(diphenylphosphino)ethylamine was added to toluene solvent, and paraformaldehyde aqueous solution was added in batches under stirring conditions. The reaction was carried out for 2-8 hours to obtain the triazine derivative.

[0034] Further, the sterically hindered amine comprises: dimethylaminoethanol and 2-(4-((2-methylbutyl)amino)phenyl)ethanol in a mass ratio of 1:(0.3-0.6).

[0035] Furthermore, in the preparation of the triazine derivative, the molar ratio of 2-(diphenylphosphino)ethylamine to paraformaldehyde is (1.2–1.5):1.

[0036] Furthermore, the stirring rate is 400-600 r / min, and the reaction temperature is 30-60℃.

[0037] Furthermore, the stabilizer comprises one or more of the following: tea polyphenols, hydroquinone, naphthalene polyphenols, p-hydroxyanisole, thiodipropionic acid, and diethylhydroxylamine.

[0038] Furthermore, the synergist includes one or more of piperazine, N-methyldiethanolamine, and sulfolane.

[0039] Furthermore, the penetrant includes sodium succinate sulfonate or sodium hydroxyethyl sulfonate.

[0040] Furthermore, the auxiliary agent includes one or more of triethylamine, diethylamine, and sodium hydroxide.

[0041] Furthermore, the inhibitor includes ethoxylated tristyrylphenol or ethoxylated nonylphenol.

[0042] To further illustrate the present invention, the following describes a triazine desulfurizer and its preparation method provided by the present invention in conjunction with embodiments. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating procedures. They are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0043] Example 1:

[0044] The triazine desulfurizer provided in this embodiment is mainly prepared from the following raw materials by weight percentage:

[0045] The composition consists of 20 wt% triazine derivative, 10 wt% hindered amine, 3 wt% tea polyphenol, 1 wt% piperazine, 0.5 wt% sodium succinate sulfonate, 0.5 wt% ethoxylated tristyrylphenol, and 1 wt% triethylamine, with the remainder being water.

[0046] Among them, the sterically hindered amines include: dimethylaminoethanol and 2-(4-((2-methylbutyl)amino)phenyl)ethanol in a mass ratio of 1:0.3.

[0047] The preparation of triazine derivatives includes:

[0048] 2-(diphenylphosphino)ethylamine was added to toluene solvent, and under stirring conditions, paraformaldehyde aqueous solution was added in batches at a stirring rate of 400 r / min. The reaction was carried out at 30℃ for 2 h to obtain triazine derivative.

[0049] The molar ratio of 2-(diphenylphosphino)ethylamine to paraformaldehyde is 1.2:1.

[0050] The preparation method of the triazine desulfurizer in this embodiment includes:

[0051] Triazine derivatives, hindered amines and water are mixed and stirred evenly. Then, stabilizers, synergists, penetrants, inhibitors and adjuvants are added. The mixture is stirred at 30°C for 20 minutes to obtain a triazine desulfurizing agent.

[0052] Example 2:

[0053] The triazine desulfurizer provided in this embodiment is mainly prepared from the following raw materials by weight percentage:

[0054] The composition consists of 30 wt% triazine derivative, 12 wt% sterically hindered amine, 4 wt% hydroquinone, 1.5 wt% N-methyldiethanolamine, 0.7 wt% sodium hydroxyethyl sulfonate, 0.7 wt% ethoxylated nonylphenol, and 1.2 wt% diethylamine, with the remainder being water.

[0055] Among them, the sterically hindered amines include: dimethylaminoethanol and 2-(4-((2-methylbutyl)amino)phenyl)ethanol in a mass ratio of 1:0.4.

[0056] The preparation of triazine derivatives includes:

[0057] 2-(diphenylphosphino)ethylamine was added to toluene solvent, and under stirring conditions, paraformaldehyde aqueous solution was added in batches at a stirring rate of 450 r / min. The reaction was carried out at 40 °C for 4 h to obtain triazine derivative.

[0058] The molar ratio of 2-(diphenylphosphino)ethylamine to paraformaldehyde is 1.3:1.

[0059] The preparation method of the triazine desulfurizer in this embodiment includes:

[0060] Triazine derivatives, hindered amines and water are mixed and stirred evenly. Then, stabilizers, synergists, penetrants, inhibitors and adjuvants are added. The mixture is stirred at 35°C for 30 minutes to obtain a triazine desulfurizer.

[0061] Example 3:

[0062] The triazine desulfurizer provided in this embodiment is mainly prepared from the following raw materials by weight percentage:

[0063] The composition consists of 35 wt% triazine derivative, 13 wt% hindered amine, 5 wt% p-hydroxyanisole, 2 wt% sulfolane, 1 wt% sodium succinate sulfonate, 1 wt% ethoxylated tristyrylphenol, and 1.5 wt% sodium hydroxide, with the remainder being water.

[0064] Among them, the sterically hindered amines include: dimethylaminoethanol and 2-(4-((2-methylbutyl)amino)phenyl)ethanol in a mass ratio of 1:0.45.

[0065] The preparation of triazine derivatives includes:

[0066] 2-(diphenylphosphino)ethylamine was added to toluene solvent, and under stirring conditions, paraformaldehyde aqueous solution was added in batches at a stirring rate of 500 r / min. The reaction was carried out at 45℃ for 5 h to obtain triazine derivative.

[0067] The molar ratio of 2-(diphenylphosphino)ethylamine to paraformaldehyde is 1.35:1.

[0068] The preparation method of the triazine desulfurizer in this embodiment includes:

[0069] Triazine derivatives, hindered amines and water are mixed and stirred evenly. Then stabilizers, synergists, penetrants, inhibitors and adjuvants are added. The mixture is stirred at 40°C for 35 minutes to obtain triazine desulfurizing agents.

[0070] Example 4:

[0071] The triazine desulfurizer provided in this embodiment is mainly prepared from the following raw materials by weight percentage:

[0072] The composition consists of 40 wt% triazine derivative, 14 wt% hindered amine, 6 wt% thiodipropionic acid, 1.2 wt% sodium hydroxyethyl sulfonate, 1.2 wt% ethoxylated tristyrylphenol, and 1.7 wt% triethylamine, with the remainder being water.

[0073] Among them, the sterically hindered amines include: dimethylaminoethanol and 2-(4-((2-methylbutyl)amino)phenyl)ethanol in a mass ratio of 1:0.55.

[0074] The preparation of triazine derivatives includes:

[0075] 2-(diphenylphosphino)ethylamine was added to toluene solvent, and under stirring conditions, paraformaldehyde aqueous solution was added in batches at a stirring rate of 550 r / min. The reaction was carried out at 50 °C for 6 h to obtain triazine derivative.

[0076] The molar ratio of 2-(diphenylphosphino)ethylamine to paraformaldehyde is 1.4:1.

[0077] The preparation method of the triazine desulfurizer in this embodiment includes:

[0078] Triazine derivatives, hindered amines and water are mixed and stirred evenly. Then, stabilizers, synergists, penetrants, inhibitors and adjuvants are added. The mixture is stirred at 45°C for 40 minutes to obtain a triazine desulfurizer.

[0079] Example 5:

[0080] The triazine desulfurizer provided in this embodiment is mainly prepared from the following raw materials by weight percentage:

[0081] The composition consists of 50 wt% triazine derivative, 15 wt% hindered amine, 7 wt% diethylhydroxylamine, 3 wt% sulfolane, 1.5 wt% sodium succinate sulfonate, 1.5 wt% ethoxylated nonylphenol, and 2 wt% triethylamine, with the remainder being water.

[0082] Among them, the sterically hindered amines include: dimethylaminoethanol and 2-(4-((2-methylbutyl)amino)phenyl)ethanol in a mass ratio of 1:0.6.

[0083] The preparation of triazine derivatives includes:

[0084] 2-(diphenylphosphino)ethylamine was added to toluene solvent, and under stirring conditions, paraformaldehyde aqueous solution was added in batches at a stirring rate of 600 r / min. The reaction was carried out at 60 °C for 8 h to obtain triazine derivative.

[0085] The molar ratio of 2-(diphenylphosphino)ethylamine to paraformaldehyde is 1.5:1.

[0086] The preparation method of the triazine desulfurizer in this embodiment includes:

[0087] Triazine derivatives, hindered amines and water are mixed and stirred evenly. Then, stabilizers, synergists, penetrants, inhibitors and adjuvants are added. The mixture is stirred at 50°C for 50 minutes to obtain a triazine desulfurizer.

[0088] Compare with Example 1:

[0089] The triazine desulfurizer in this comparative example has the same composition and preparation method as in Example 1, except that it does not contain hindered amines.

[0090] Compare with Example 2:

[0091] The composition and preparation method of the triazine desulfurizer in this comparative example are the same as those in Example 1, except that the triazine derivative is 1,3,5-tris(2-hydroxyethyl)-hexahydrotriazine.

[0092] Performance testing;

[0093] 1. Determination of desulfurization rate:

[0094] Take 5 mL of the triazine desulfurizing agent prepared in Examples 1-5 and the triazine desulfurizing agent in Control Examples 1-2, treat them at 50°C, and then add them to an absorption bottle containing 95 mL of water. Stir well. Then, introduce a mixture of nitrogen and hydrogen sulfide containing 4000 ppm hydrogen sulfide. Control the gas flow rate at 20 mL / min to ensure sufficient contact between the mixed gas and the diluted desulfurizing agent. Then, use a hydrogen sulfide detector to measure the hydrogen sulfide content in the mixed gas after desulfurization treatment at the outlet of the absorption bottle. The results are shown in Table 1 below.

[0095] Table 1

[0096]

[0097]

[0098] As shown in Table 1, the triazine desulfurizer provided by this invention has a good desulfurization effect, and the solution after desulfurization is uniform and free of precipitation.

[0099] 2. Determination of sulfur capacity:

[0100] Sulfur capacity determination: The raw gas was a mixture of H2S and N2, with an H2S volume fraction of 0.1%, a pressure of 3 MPa, and a temperature of 40°C. 300 ml of the triazine desulfurizing agent prepared in Examples 1-5 and Comparative Examples 1-2 was added to the chamber of a high-pressure reactor. The temperature of the absorbent liquid in the reactor was controlled by the heat transfer oil in the jacket. The sulfur capacity was determined by bubbling H2S-containing gas. The results are shown in Table 2.

[0101] During the experiment, the flow rate of the raw gas was 600 mL / min, and a 2% (w / w) zinc acetate solution was introduced into the purified gas outlet. Timing started when the raw gas was introduced and stopped when the zinc acetate solution turned noticeably white.

[0102] Table 2

[0103] Example 1 Example 2 Example 3 Example 4 Example 5 Compare with Example 1 Compare with Example 2 Sulfur capacity / g 17.5 16.8 15.2 16.6 18.2 12.7 10.3

[0104] As can be seen from Table 2, the triazine desulfurizer provided by the present invention has a high sulfur capacity.

[0105] 3. Determination of scale inhibition performance:

[0106] Scale inhibition performance was tested according to GB / T16632-2019 "Determination of Scale Inhibition Performance of Water Treatment Agents - Calcium Carbonate Deposition Method". Triazine desulfurizing agents prepared in Examples 1-5 and Comparative Examples 1-2 were used to test the scale inhibition performance at a concentration of 18000 mg / m³. 3 Hydrogen sulfide gas was subjected to a removal test. The desulfurization rate (%) = (total mass of imported hydrogen sulfide - total mass of exported hydrogen sulfide) / total mass of imported and exported hydrogen sulfide. The concentration of exported hydrogen sulfide was recorded. The test results are shown in the table below.

[0107] Table 3

[0108] Example 1 Example 2 Example 3 Example 4 Example 5 Compare with Example 1 Compare with Example 2 Scale inhibition rate / % 68.8 71.2 74.3 72.5 70.7 54.3 50.7

[0109] As can be seen from Table 3, the triazine-based desulfurizer provided by this invention has a better scale inhibition effect.

[0110] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A triazine-based desulfurizing agent, characterized in that, The triazine desulfurizer is mainly prepared from the following raw materials by weight percentage: 20–50 wt% triazine derivative, 10–15 wt% hindered amine, 3–7 wt% stabilizer, 1–3 wt% synergist, 0.5–1.5 wt% penetrant, 0.5–1.5 wt% inhibitor, and 1–2 wt% adjuvant, with the remainder being water; The preparation of the triazine derivative includes: 2-(diphenylphosphino)ethylamine was added to toluene solvent, and paraformaldehyde aqueous solution was added in batches under stirring conditions. The reaction was carried out for 2-8 hours to obtain the triazine derivative.

2. The triazine desulfurizer according to claim 1, characterized in that, The sterically hindered amine comprises dimethylaminoethanol and 2-(4-((2-methylbutyl)amino)phenyl)ethanol in a mass ratio of 1:(0.3-0.6).

3. The triazine desulfurizer according to claim 1, characterized in that, In the preparation of the triazine derivative, the molar ratio of 2-(diphenylphosphino)ethylamine to paraformaldehyde is (1.2-1.5):

1.

4. The triazine desulfurizer according to claim 1, characterized in that, The stirring rate is 400-600 r / min, and the reaction temperature is 30-60℃.

5. The triazine desulfurizer according to claim 1, characterized in that, The stabilizer includes one or more of the following: tea polyphenols, hydroquinone, naphthalene polyphenols, p-hydroxyanisole, thiodipropionic acid, and diethylhydroxylamine.

6. The triazine desulfurizer according to claim 1, characterized in that, The synergist includes one or more of piperazine, N-methyldiethanolamine, and sulfolane.

7. The triazine desulfurizer according to claim 1, characterized in that, The penetrant includes sodium succinate sulfonate or sodium hydroxyethyl sulfonate.

8. The triazine desulfurizer according to claim 1, characterized in that, The additives include one or more of triethylamine, diethylamine, and sodium hydroxide.

9. The triazine desulfurizer according to claim 1, characterized in that, The inhibitors include ethoxylated tristyrylphenol or ethoxylated nonylphenol.

10. A method for preparing a triazine desulfurizing agent as described in any one of claims 1-9, characterized in that, The preparation method includes: The triazine derivative, hindered amine, and water are mixed and stirred evenly. Then, stabilizers, synergists, penetrants, inhibitors, and adjuvants are added. The mixture is stirred at 30–50°C for 20–50 minutes to obtain the triazine desulfurizer.

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