A neutral alkylbenzenesulfonate additive and a method of making

Abstract

The application discloses a neutral alkyl benzene sulfonate detergent, and particularly relates to a preparation method of the neutral alkyl benzene sulfonate detergent. The method is to use alkyl benzene sulfonic acid, dilution oil, calcium oxide and the like as raw materials, remove alcohol promoters and water by heating after one-step neutralization reaction in a unique reaction system, remove the solvent by reduced pressure distillation, and finally prepare the neutral alkyl benzene sulfonate detergent product. The neutral alkyl benzene sulfonate detergent prepared by the method has excellent high-temperature detergency and colloid stability, has extremely low alkali value and ash content, and is suitable for medium and high-grade gasoline engine oil, diesel engine oil and low-ash engine oil.

Description

Technical Field

[0001] This invention belongs to the field of lubricating oil technology, and relates to a neutral alkylbenzene sulfonate additive, and further relates to a method for preparing the additive. Background Technology

[0002] Lubricating oil consists of base oil and additives, with additives comprising approximately 5-25% of the oil. The use of additives not only enables lubricating oil to meet the diverse performance requirements of the automotive and machinery industries, but also further compensates for deficiencies in the processing of the base oil, resulting in more comprehensive performance. Additives play a crucial role in improving the lubricating properties of base oils, imparting properties such as high-temperature detergency, low-temperature sludge dispersion, anti-wear and friction reduction, antioxidant properties, and rust prevention to lubricating oils, as well as contributing to energy conservation and reduced environmental pollution.

[0003] Metal detergents are among the most important functional additives in lubricating oil formulations. They inhibit oil oxidation and deterioration under high-temperature engine operating conditions, reducing the formation of high-temperature deposits on the piston ring surface. They neutralize organic acidic oxides generated from incomplete combustion of lubricating oil, as well as SO2, SO3, and sulfuric acid produced by the combustion of sulfur-containing fuels. They adsorb and encapsulate solid particulate contaminants dispersed in the lubricating oil and remove high-temperature deposits from the piston ring surface, ensuring a clean engine interior. Due to these special functions, metal detergents play a crucial role in the modern lubrication industry. Alkylbenzene sulfonates constitute approximately 70-80% of all metal detergents, holding a dominant position. Low-alkalinity sulfonates can be prepared using either the metathesis method or the direct neutralization method.

[0004] Patent CN200910011706 uses synthetic alkylbenzene sulfonic acid to neutralize sodium hydroxide aqueous solution to obtain synthetic sodium alkylbenzene sulfonate, and then adds solid calcium chloride to carry out metathesis reaction to obtain low-alkalinity synthetic calcium alkylbenzene sulfonate.

[0005] Patent CN202110207499 describes the process of adding solvent promoters, organic amines, base oils, inorganic calcium salts, and organic acids into a reaction vessel at once and stirring them. After the reaction is complete, the system is heated, subjected to vacuum distillation, and filtered to obtain a chlorine-free, low-alkalinity calcium sulfonate detergent product.

[0006] In patent 202010521878, an alkylbenzene sulfonate calcium product is prepared by using two different types of alcohols in a solvent system through two neutralization reactions. The product is used as a rust inhibitor.

[0007] Patent CN201210367772 describes a process where sulfonic acid, metal oxide or metal hydroxide, and water are mixed evenly, and then a metallization reaction is carried out at a temperature between room temperature and 100°C. The mixture is then flash-dried and purified to remove slag, resulting in a transparent, oily, low-alkalinity sulfonate product with a total base value of less than 50 mg KOH / g.

[0008] Alkylbenzene sulfonates are generally classified into low, medium, high, and ultra-high base number products according to their base number. They are stable micelles formed by calcium alkylbenzene sulfonate molecules encapsulating varying amounts of calcium carbonate and calcium hydroxide components, uniformly dispersed in diluent oil. The different amounts of calcium carbonate and calcium hydroxide encapsulated in the micelles reflect the different base numbers of the products, indicating different acid neutralization capabilities. In general, the higher the base number, the more base reserve is provided; ultra-high base number products can contain over 40% calcium carbonate, exhibiting extremely excellent acid neutralization capabilities. Relatively speaking, low base number sulfonate products have a higher proportion of normal salt components, providing superior cleaning performance for engine surfaces. However, products produced using current processes contain a certain amount of calcium hydroxide or calcium halides. These calcium compounds are polar and easily precipitate from the micelles during oil use, causing oil turbidity or flocculent formation in acidic systems. Furthermore, low base number calcium sulfonate products on the market mainly rely on heavy alkylbenzene sulfonic acid as a key raw material; products synthesized from long-chain linear alkylbenzene sulfonic acid cannot solve the problem of a sharp increase in product viscosity. Summary of the Invention

[0009] The purpose of this invention is to provide a neutral alkylbenzene sulfonate additive that solves the problems of oil turbidity or flocculent formation in acidic systems in the prior art.

[0010] The technical solution adopted in this invention is:

[0011] A neutral alkylbenzene sulfonate additive, with the following product structure:

[0012]

[0013] Where: R is C 13 -C 30 alkyl carbon chain;

[0014] The calcium content is 1.0-2.0 wt%, and the alkali value is 1.0-10.0 mg KOH / g.

[0015] Another technical solution of the present invention is a method for preparing a neutral alkylbenzene sulfonate additive, which uses the following raw materials:

[0016] Based on 100 parts by weight of alkylbenzene sulfonic acid, it also includes diluent oil: 80-120 parts, alkaline component: 5-15 parts, alcohol accelerator: 10-30 parts, surfactant: 1-10 parts and additive: 0.1-1 parts;

[0017] Includes the following steps:

[0018] Step 1: Add a measured amount of diluent oil, alkaline components, alcohol accelerator and additives to the reaction flask or reaction vessel, heat up and start stirring, stir evenly, and the temperature is 30-50℃.

[0019] Step 2: Slowly add a measured amount of alkylbenzene sulfonic acid and surfactant to the reaction flask or reactor, heat to the reaction temperature, and carry out the neutralization reaction. The reaction temperature is 60-90℃, and the reaction time is 1.0-3.0h.

[0020] Step 3: The reaction product from Step 2 is heated to remove the alcohol accelerator and water at a temperature of 120℃~150℃. After removal, the product is cooled and diluted with solvent oil. Unreacted alkaline components are removed by centrifugation. Finally, the solvent is removed by vacuum distillation to obtain a neutral alkylbenzene sulfonate detergent product. The cooling temperature is 40~80℃, and the vacuum distillation temperature is 130℃~180℃.

[0021] The invention is further characterized by:

[0022] Alkylbenzenesulfonic acid is an alkyl carbon chain C. 18 C 20 C 22 C 24 and C 20-24 Long-chain linear alkylbenzene sulfonic acid with mixed carbon chains.

[0023] The alkaline component is industrial calcium oxide or calcium hydroxide.

[0024] The alcohol accelerator is one or more of the following: n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-pentanol, isopentanol, tert-pentanol, and ethylene glycol.

[0025] The auxiliary agent is one of calcium chloride, magnesium chloride, potassium chloride, or sodium chloride.

[0026] The surfactants include naphthenic acid, polyisobutylene succinic acid, stearic acid, oleic acid, and alkyl salicylic acid.

[0027] The diluent oil is any one of Group I, II, or III light base oils.

[0028] The solvent oils include petroleum ether at 60-90℃, petroleum ether at 90-120℃, heptane, gasoline, 120# solvent oil, or 200# solvent oil.

[0029] The beneficial effects of this invention are:

[0030] I. This invention uses long-chain linear alkylbenzene sulfonic acid as raw material, which not only ensures that the product has good adsorption and cleaning performance for deposits, but also gives the product excellent oil solubility, thereby improving the intrinsic cleaning performance of the product.

[0031] II. The preparation method involved in this invention is a solvent-free reaction system, which does not use heptane, benzene, xylene or solvent oil as reaction solvent.

[0032] Third, the preparation method of the present invention is the first to use an appropriate amount of surfactant alkyl salicylic acid, which forms a structurally stable mixed micelle with long-chain linear alkylbenzene sulfonate calcium under the action of calcium oxide, thereby optimizing the colloidal structure of the product and improving the stability of the product.

[0033] Fourth, by adjusting a small amount of additives, this invention avoids the tendency of calcium alkylbenzene sulfonate molecules to aggregate in large quantities to form macromolecular agglomerates, thereby preventing a sharp increase in product viscosity and effectively improving the viscosity of the product.

[0034] The neutral alkylbenzene sulfonate calcium detergent product prepared by this invention has an alkalinity value below 10.0 mg KOH / g. In addition to its excellent high-temperature detergency and colloidal stability, it also possesses extremely low alkalinity and ash content, making it suitable for high-grade internal combustion engine oils and low-ash engine oils. Furthermore, the synthesis reaction requires only one neutralization step, making it easy to implement in production and possessing the conditions for market production and promotion, thus showing good development prospects. Attached Figure Description

[0035] Figure 1 The mass spectrum of the product from Example 1 shows an alkyl carbon chain of C12. 20 -C 24 Calcium alkylbenzene sulfonate;

[0036] Figure 2 This is a mass spectrum of commercially available T104 product, showing an alkyl carbon chain of C104. 13 -C 26 Calcium heavy alkylbenzene sulfonate. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0038] The structure of a neutral alkylbenzene sulfonate additive product of the present invention is as follows:

[0039]

[0040] Where: R is C 13 -C 30 alkyl carbon chain;

[0041] The calcium content is 1.0-2.0 wt%, and the alkali value is 1.0-10.0 mg KOH / g.

[0042] Another aspect of the present invention is a method for preparing a neutral alkylbenzene sulfonate additive, which uses the following raw materials:

[0043] Based on 100 parts by weight of alkylbenzene sulfonic acid, it also includes diluent oil: 80-120 parts, alkaline component: 5-15 parts, alcohol accelerator: 10-30 parts, surfactant: 1-10 parts and additive: 0.1-1 parts.

[0044] Includes the following steps:

[0045] Step 1: Add a measured amount of diluent oil, alkaline component, alcohol accelerator and auxiliary agent to the reaction flask or reaction vessel, heat up and turn on the stirrer, and stir until uniform;

[0046] Step 2: Slowly add a measured amount of alkylbenzene sulfonic acid and surfactant into the reaction flask or reactor, and heat to the reaction temperature to carry out the neutralization reaction;

[0047] Step 3: Heat the reaction product from Step 2 to remove the alcohol accelerator and water. After removal, cool down and add solvent oil for dilution. Centrifuge to remove unreacted alkaline components. Finally, remove the solvent by vacuum distillation to obtain the neutral alkylbenzene sulfonate detergent product.

[0048] Preferably, the four-necked flask or reaction vessel is equipped with an electric stirrer, thermometer and condenser for dehydration. The heating temperature in step 1 is 30-50°C; the neutralization reaction temperature in step 2 is 60-90°C and the neutralization reaction time is 1.0-3.0 h.

[0049] In step 3, the temperature for removing alcohol and water from the crude product is 120℃~150℃, the cooling temperature is 40~80℃, and the vacuum distillation temperature is 130℃~180℃.

[0050] The alkylbenzene sulfonic acid is a long-chain linear alkylbenzene sulfonic acid, preferably with an alkyl carbon chain of C. 18 C 20 C 22 C 24 and C 20-24 Long-chain linear alkylbenzene sulfonic acids with mixed carbon chains, preferably C 20-24 Long-chain linear alkylbenzene sulfonic acid.

[0051] The alkaline component is industrial calcium oxide or calcium hydroxide, with calcium oxide being preferred.

[0052] The alcohol accelerator is one or more of the following: n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-pentanol, isopentanol, tert-pentanol, ethylene glycol, etc.

[0053] The auxiliary agent is one of calcium chloride, magnesium chloride, potassium chloride or sodium chloride, preferably calcium chloride, and more preferably anhydrous calcium chloride.

[0054] The surfactants include naphthenic acid, polyisobutylene succinic acid, stearic acid, oleic acid, alkyl salicylic acid, etc., with alkyl salicylic acid being preferred, and alkyl carbon chain C being more preferred. 16 The above are long-chain linear alkyl salicylic acids.

[0055] In step S1, the diluent oil is any one of Group I, II, or III light base oils such as MVI 150, HVI 150, HVI 200, or HVIP6.

[0056] In step 3, alkylbenzene sulfonic acid and surfactant are added simultaneously.

[0057] The solvent oils include petroleum ether at 60-90℃, petroleum ether at 90-120℃, heptane, gasoline, 120# solvent oil, or 200# solvent oil.

[0058] Example 1

[0059] Add 100.0g of HVI 150 base oil, 8.0g of industrial calcium oxide, 15.0g of n-butanol accelerator, and 0.5g of anhydrous calcium chloride auxiliaries to a 500mL four-necked flask equipped with an electric stirrer, thermometer, and condenser. Turn on the stirrer and heat to 40℃. After the system is thoroughly mixed, slowly add C... 20-24 100.0 g of long-chain linear alkylbenzene sulfonic acid and 5.0 g of C18 alkyl salicylic acid were added. It was observed that the temperature of the system gradually increased with the addition of acid. The neutralization reaction was carried out at 80℃. The solid and liquid mixture in the four-necked flask was gradually stirred evenly. The system changed from grayish-brown to brownish-yellow and the appearance gradually changed from turbid to clear. The neutralization reaction was maintained for 1.5 h.

[0060] After the neutralization reaction, the system was heated to 140℃ to remove the alcohol accelerator and the generated water. Once no liquid flowed out of the condenser, the heating was stopped, and the system was then cooled to 60℃. Approximately 200 mL of 120# solvent oil was added for dilution. The mixture was then centrifuged at 3500 rpm for 30 minutes to remove unreacted calcium oxide residue. Finally, the solvent was removed by vacuum distillation at 160℃ and 15 kPa to obtain the product. The product had an alkalinity of 3.5 mg KOH / g, a calcium content of 1.22%, a chlorine content of less than 0.01%, a sulfate ash content of 4.08%, and a kinematic viscosity (100℃) of 21.32 mm. 2 / s, turbidity 7.0 JTU.

[0061] Example 2

[0062] Add 110.0g of MVI 150 base oil, 10.0g of industrial calcium oxide, 15.0g of n-butanol accelerator, and 0.3g of anhydrous calcium chloride auxiliaries to a 500mL four-necked flask equipped with an electric stirrer, thermometer, and condenser. Turn on the stirrer and heat to 40℃. After the system is thoroughly mixed, slowly add C... 20-24 100.0 g of long-chain linear alkylbenzene sulfonic acid and 5.0 g of C16-18 alkyl salicylic acid were added. It was observed that the temperature of the system gradually increased with the addition of acid. The neutralization reaction was carried out at 80℃. The solid and liquid mixture in the four-necked flask was gradually stirred evenly. The system changed from grayish-brown to brownish-yellow and the appearance gradually changed from turbid to clear. The neutralization reaction was maintained for 2.0 h.

[0063] After the neutralization reaction, the system was heated to 150℃ to remove the alcohol promoter and the generated water. Once no liquid flowed out of the condenser, the heating was stopped, and the system was then cooled to 40℃. Approximately 200 mL of heptane was added for dilution. The mixture was then centrifuged at 3500 rpm for 30 minutes to remove unreacted calcium oxide residue. Finally, the solvent was removed by vacuum distillation at 160℃ and 15 kPa to obtain the product. The product had a base value of 4.7 mg KOH / g, a calcium content of 1.34%, a chlorine content of less than 0.01%, a sulfate ash content of 4.41%, and a kinematic viscosity (100℃) of 24.25 mm. 2 / s, turbidity 8.0 JTU.

[0064] Example 3

[0065] Add 100.0g of MVI 150 base oil, 6.5g of industrial calcium oxide, 20.0g of n-butanol accelerator, and 0.8g of anhydrous calcium chloride auxiliaries to a 500mL four-necked flask equipped with an electric stirrer, thermometer, and condenser. Turn on the stirrer and heat to 40℃. After the system is thoroughly mixed, slowly add C... 20-24 100.0 g of long-chain linear alkylbenzene sulfonic acid and 7.5 g of C16-18 alkyl salicylic acid were added. It was observed that the temperature of the system gradually increased with the addition of acid. The neutralization reaction was carried out at 80℃. The solid and liquid mixture in the four-necked flask was gradually stirred evenly. The system changed from grayish-brown to brownish-yellow and the appearance gradually changed from turbid to clear. The neutralization reaction was maintained for 2.0 h.

[0066] After the neutralization reaction, the system was heated to 150℃ to remove the alcohol accelerator and the generated water. Once no liquid flowed out of the condenser, the heating was stopped, and the system was then cooled to 40℃. Approximately 200 mL of 120# solvent oil was added for dilution. The mixture was centrifuged at 3500 rpm for 30 minutes to remove unreacted calcium oxide residue. Finally, the solvent was removed by vacuum distillation at 170℃ and 20 kPa to obtain the product. The product had an alkalinity of 1.5 mg KOH / g, a calcium content of 0.92%, a chlorine content of less than 0.01%, a sulfate ash content of 3.42%, and a kinematic viscosity (100℃) of 14.33 mm. 2 / s, turbidity 7.5 JTU.

[0067] A method for preparing a neutral alkylbenzene sulfonate detergent specifically includes the following comparative examples: Comparative example 1 uses acetic acid as an auxiliary agent instead of anhydrous calcium chloride; Comparative example 2 uses methanol as an alcohol accelerator; Comparative example 3 adopts a metathesis method.

[0068] Comparative Example 1

[0069] Add 100.0g of MVI 150 diluent oil, 12.0g of industrial calcium hydroxide, 15.0g of n-butanol accelerator, and 3.5g of acetic acid to a 500mL four-necked reaction flask equipped with an electric stirrer, thermometer, and condenser. Start the stirrer and heat to 40℃. After the system is thoroughly mixed, slowly add C... 20-24 100.0 g of long-chain linear alkylbenzene sulfonic acid was added. It was observed that the system temperature gradually increased with the addition of acid. The neutralization reaction was carried out at 80℃. The solid-liquid mixture in the four-necked flask was gradually stirred until homogeneous, and the system changed from grayish-brown to brownish-yellow, gradually changing from turbid to clear. However, as the reaction proceeded, the system gradually became viscous. After 2.0 h, the neutralization reaction ended. The system was heated to 150℃ to remove the alcohol promoter and the generated water. After no liquid flowed out of the condenser, the heating was stopped, and then the temperature was lowered to 40℃. Approximately 200 mL of 120# solvent oil was added for dilution. The mixture was centrifuged at 3500 rpm for 30 min to remove unreacted calcium oxide residue. Finally, the solvent was removed by vacuum distillation at 160℃ and 25 kPa to obtain the product. The product had an alkalinity of 23.5 mg KOH / g, a calcium content of 2.56%, a sulfate ash content of 8.83%, and a kinematic viscosity (100℃) of 186.72 mmHg. 2 / s, turbidity 65.0 JTU.

[0070] Comparative Example 2

[0071] In a 500 mL four-necked reaction flask equipped with an electric stirrer, thermometer, and condenser, 100.0 g of MVI 150 diluent, 100.0 g of heavy alkylbenzene sulfonic acid, 120.0 g of toluene, and 20.0 g of methanol were added. The stirring was started and the temperature was raised to 40 °C. 12 g of calcium hydroxide was added to the reaction system, and the reaction was carried out at 55 °C for 1.5 h to obtain crude calcium alkylbenzene sulfonate. After the neutralization reaction was completed, the system was heated to 150 °C to remove the alcohol promoter, toluene, and the generated water. After no liquid flowed out of the condenser, the heating was stopped, and then the temperature was lowered to 40 °C. Approximately 200 mL of toluene was added for dilution. The mixture was centrifuged at 3500 rpm for 30 min to remove unreacted calcium oxide residue. Finally, the solvent was removed by vacuum distillation at 150 °C and 20 kPa to obtain the product. The product has an alkalinity of 26.0 mg KOH / g, a calcium content of 2.73%, a sulfate ash content of 9.38%, and a kinematic viscosity (100℃) of 34.32 mm. 2 / s, turbidity 17.0 JTU.

[0072] Comparative Example 3

[0073] In a 500mL four-necked reaction flask equipped with an electric stirrer, thermometer, and condenser, 100.0g of MVI 150 diluent oil, 90.0g of heavy alkylbenzene sulfonic acid, and 100.0g of 120# solvent oil were added. 45.0g of 20% sodium hydroxide solution was slowly added at 40℃, and the reaction was carried out at 65℃ for 1.0 hour for acid-base neutralization. Then, 13.0g of anhydrous calcium chloride was added, and the reaction was continued at 65℃ for 3.0 hours. Finally, the mixture was allowed to stand and separate into layers. The upper neutral calcium sulfonate salt was washed with water until neutral, and then the solvent and water were removed by vacuum distillation to obtain low-base-value calcium sulfonate. The product has a base value of 21.6mgKOH / g, a calcium content of 2.54%, a chloride content of 0.24%, a sulfate ash content of 9.85%, and a kinematic viscosity (100℃) of 34.33mm. 2 / s, turbidity 27.0 JTU.

[0074] The performance evaluation results of the neutral alkylbenzene sulfonate calcium detergent prepared by the preparation methods of Examples 1-3, the low-alkalinity alkylbenzene sulfonate calcium of Comparative Examples 1-3, and the commercially available T104 are shown in Table 1.

[0075] Table 1 Comparative Analysis of the Performance of Alkylbenzene Sulfonate Detergents

[0076]

[0077]

[0078] Note: The lower the coking rate and heat pipe oxidation rating, the better the high-temperature detergency; high-temperature storage is achieved by adding 10% of the sample to Group III base oil, placing it in a conical storage tube, and storing it at high temperature for 10 days. The less precipitation, the better the colloidal stability; water stability is achieved by mixing 95% of the sample with 5% distilled water, placing it in a conical storage tube, and storing it at 75°C for 3 days. The less precipitation, the better the colloidal stability; acid resistance is achieved by mixing 95% of the sample with 5% acetic acid, placing it in a conical storage tube, and storing it at 75°C for 3 days. The less precipitation, the better the colloidal stability.

[0079] As shown in the performance analysis in Table 1, the neutral alkylbenzene sulfonate calcium detergent of the present invention has excellent high-temperature detergency and colloidal stability, as well as very low ash content and excellent acid resistance. It meets the stringent requirements of internal combustion engine oils for high-temperature detergency, stability and low ash content, and has good application prospects in high-end engine oils and industrial oils.

[0080] like Figure 1 and Figure 2 . Figure 1 The medium mass-to-charge ratio (M / Z) of 437.6 is C. 20 Alkylbenzene sulfonate ion, 465.7 is C 22 Alkylbenzene sulfonate ion, 493.8 is C 24 alkylbenzene sulfonate ions, the mass spectrum shows that the examples used C 20-24 Long-chain linear alkylbenzene sulfonic acid; Figure 2 The mass-to-charge ratio (M / Z) of 339.4-521.8 indicates that commercially available T104 uses alkyl carbon chain C. 13-26 Heavy alkylbenzene sulfonic acid.

Claims

1. A method for preparing a neutral alkylbenzene sulfonate additive, characterized in that, The structure of the additive is as follows: The R is C 13 -C 30 alkyl carbon chain; The calcium content is 1.0-2.0 wt%, and the alkali value is 1.0-10.0 mg KOH / g; The additive is prepared using the following raw materials: Based on 100 parts by weight of alkylbenzene sulfonic acid, it also includes diluent oil: 80-120 parts, alkaline component: 5-15 parts, alcohol accelerator: 10-30 parts, surfactant: 1-10 parts and additive: 0.1-1 parts; Its preparation method includes the following steps: Step 1: Add a measured amount of diluent oil, alkaline components, alcohol accelerator and additives to the reaction flask or reaction vessel, heat up and start stirring, stir evenly, and the temperature is 30-50℃. Step 2: Slowly add a measured amount of alkylbenzene sulfonic acid and surfactant to the reaction flask or reactor, heat to the reaction temperature, and carry out the neutralization reaction. The reaction temperature is 60-90℃, and the reaction time is 1.0-3.0h. Step 3: The reaction product of Step 2 is heated to remove alcohol accelerator and water at a temperature of 120℃~150℃. After removal, the product is cooled and diluted with solvent oil. Unreacted alkaline components are removed by centrifugation. Finally, the solvent is removed by vacuum distillation to obtain a neutral alkylbenzene sulfonate detergent product. The cooling temperature is 40~80℃ and the vacuum distillation temperature is 130℃~180℃. The alkylbenzene sulfonic acid is a long-chain linear alkylbenzene sulfonic acid with alkyl carbon chains of C18, C20, C22, C24 and a mixture of C20-24 carbon chains; The alkaline component is industrial calcium oxide or calcium hydroxide; The alcohol accelerator is one of n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-pentanol, isopentanol, tert-pentanol, and ethylene glycol; The auxiliary agent is one of calcium chloride, magnesium chloride, potassium chloride, or sodium chloride; The surfactant is any one of naphthenic acid, polyisobutylene succinic acid, stearic acid, oleic acid, and alkyl salicylic acid.

2. The method for preparing a neutral alkylbenzene sulfonate additive as described in claim 1, characterized in that, The diluent oil is any one of Group I, II, or III light base oils.

3. The method for preparing a neutral alkylbenzene sulfonate additive as described in claim 1, characterized in that, The solvent oil is any one of petroleum ether at 60-90℃, petroleum ether at 90-120℃, heptane, gasoline, 120# solvent oil, or 200# solvent oil.

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