Low-carbon marine fuel oil stabilizer, low-carbon marine fuel oil and preparation method of low-carbon marine fuel oil stabilizer

Abstract

The invention discloses a low-carbon marine fuel oil stabilizer, a low-carbon marine fuel oil and a preparation method of the low-carbon marine fuel oil stabilizer. The stabilizer is prepared from the following components in percentage by weight: 1 to 15 percent of fatty amine, 1.5 to 5 percent of fatty acid ester, 10 to 20 percent of alcohol, 0.1 to 3 percent of alkylphenol polyoxyethylene-polyoxypropylene alcohol ether, 10 to 30 percent of amphiphilic block polymer, 5 to 10 percent of Tween, 3 to 10 percent of defoaming agent and the balance of hydrogenated white oil. The stabilizer disclosed by the invention has the characteristics of emulsifying and solubilizing, and has the effects of improving the compatibility and increasing the system stability on the low-carbon component blended marine fuel oil.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel oil blending, and in particular is a low-carbon marine fuel oil stabilizer and a preparation and application method thereof. Background Art

[0002] Traditional fuel oil production in my country mostly uses straight run and vacuum distillation residue oil as the basic raw material, combined with heavy fractions on the production line for blending. In recent years, in order to reduce the blending cost, slurry oil and shale oil are used as the basic raw materials, combined with residue oil, asphalt and other raw materials for blending. Such raw materials contain high molecular weight condensed aromatic asphaltenes with heteroatoms, which will precipitate and deposit during the transportation, storage and use of the oil, resulting in adverse consequences.

[0003] Patent ZL200810150454.1 discloses a methanol diesel stabilizing and enhancing additive for automobiles. A certain amount of n-octanol, n-pentanol, oleic acid, cyclohexane acid, Span 80 and acrylate are sequentially added into a reactor, stirred slowly to make them completely and evenly mixed, and then a set amount of triethanolamine is gradually added under cooling conditions, stirred fully, and a product is obtained for improving the flash point and cetane number of methanol diesel. The purpose of this invention is to stabilize methanol diesel, but it is not applicable to marine fuel oil systems.

[0004] Patent CN201910742166.3 discloses a highly clean methanol diesel for marine diesel engines. The invention provides a methanol diesel for improving the safety and calorific value of alcohol-based fuels and replacing petrochemical 0# diesel. However, the invention obtains fuel oil by directly mixing additives with methanol and ethanol, and cannot be used as a stability additive for conventional marine fuel oil systems.

[0005] In order to improve the storage and transportation stability of the low-carbon marine fuel oil system after blending, it is necessary to develop a stabilizer that can be used for low-carbon marine fuel oil. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a low-carbon marine fuel oil stabilizer, a low-carbon marine fuel and a preparation method thereof. The stabilizer of the present invention has the characteristics of emulsification and solubilization, and has the effect of improving the compatibility and increasing the stability of the system for blending marine fuel oil with low-carbon components.

[0007] According to a first aspect of the present invention, the present invention provides a low-carbon marine fuel oil stabilizer.

[0008] A low-carbon marine fuel oil stabilizer comprises, by weight percentage, 1-15% fatty amine, 1.5-5% fatty acid esters, 10-20% alcohols, 0.1-3% alkylphenol polyoxyethylene-polyoxypropylene alcohol ether, 10-30% amphiphilic block polymer, 5-10% Tween, 3-10% defoamer, and the balance is hydrogenated white oil.

[0009] In the present invention, the fatty amine is a primary amine, preferably at least one of ethylenediamine, propylenediamine, butylenediamine, pentanediamine or hexamethylenediamine.

[0010] In the present invention, the fatty acid esters include fatty acid methyl esters, fatty acid ethyl esters or a mixture of several thereof, and the carbon chain of the fatty acid is between 12 and 18.

[0011] In the present invention, the alcohol is a normal or isomeric alcohol having a carbon atom chain length of 4 to 9.

[0012] In the present invention, the alkylphenol in the alkylphenol polyoxyethylene-polyoxypropylene alcohol ether is selected from an alkyl group with a carbon number of 8 to 18. The addition ratio of polyoxyethylene to polyoxypropylene is 50:50 to 95:5, and the polyoxyethylene group (-(CH 2 CH 2 O) n -) has a degree of polymerization n of 10~90.

[0013] In the present invention, the amphiphilic block polymer is a diblock copolymer of polyisobutenyl succinic anhydride and polyalkylene glycol or polyoxyalkylene, wherein the content of the polyisobutenyl succinic anhydride unit is 30% to 60% and the molecular weight is 15,000 to 500,000.

[0014] In the present invention, the Tween is one of Tween-60 series and Tween-80 series or a mixture of the two.

[0015] In the present invention, the defoamer is one or more of a polyether defoamer, a silicone defoamer, and a polyether-modified silicone type, preferably a polyether-modified silicone oil. In the present invention, the hydrogenated white oil is an industrial grade white oil with the grades of 5#, 7#, 10#, 15#, 22#, 32#, 46#, and 68#, and one or more of them can be used in combination.

[0016] The marine fuel oil stabilizer of the present invention is designed to solve the problems of poor compatibility and easy stratification of a low-carbon system formed by adding methanol to residual oil, and adopts measures such as promoting methanol modification, emulsification, dispersion, etc., and simultaneously adds a variety of additives to compound, thereby designing a composite stabilizer.

[0017] In the present invention, the fatty amine is used to emulsify the asphaltene in the residual oil, and at the same time improves the pH value of the compound stabilizer, thereby improving the overall compounding effect.

[0018] In the present invention, the alkylphenol polyoxyethylene-polyoxypropylene alcohol ether has the effect of emulsifying and reducing the viscosity of the residual oil, is conducive to the mixing of the residual oil with other oil products, and can play a synergistic role with fatty amines to effectively improve the emulsification degree of heavy oil.

[0019] In the present invention, the alcohol is a co-solvent of methanol, which improves the compatibility of methanol with other component oils.

[0020] In the present invention, the amphiphilic block polymer is a copolymer having a hydrophobic unit and a hydrophilic unit, and the polyisobutylene chain in the molecule has good compatibility with the oil phase and can function in a wide temperature range. In addition, the hydroxyl and ether groups of the hydrophilic block in the molecule can form hydrogen bonds with methanol, so that the compatibility of methanol with the oil phase is improved. The combined action of alcohols and amphiphilic block polymers allows methanol to form a large number of intermolecular hydrogen bonds with the system and adsorb each other.

[0021] In the present invention, the defoaming agent utilizes the "self-emulsification" generated by the solvent-repellent and solvent-affinity properties of the molecular structure to be evenly dispersed in the system, and stably exerts the anti-foaming and defoaming functions on the surfactant component.

[0022] In the present invention, the hydrogenated white oil is used as solvent oil, has the characteristics of low viscosity, low pour point, especially high flash point (closed cup), stable properties, high temperature resistance, and is an excellent solvent for stabilizers.

[0023] According to the second aspect of the present invention, the present invention also provides a method for preparing the above-mentioned low-carbon marine fuel oil stabilizer.

[0024] Specifically, a method for preparing the above-mentioned low-carbon marine fuel oil stabilizer comprises the following contents: (1) First, alcohols, amphiphilic block polymers and partially hydrogenated white oil are mixed and stirred to obtain solution A; (2) At temperature T1, the fatty amine, fatty acid lipids and the remaining hydrogenated white oil are mixed and stirred to obtain solution B; (3) At temperature T1 and under constant stirring, first add the defoamer to B and mix evenly, then add alkylphenol polyoxyethylene polyoxypropylene alcohol ether and stir evenly, and finally add Tween and mix evenly to obtain a mixed solution C; (4) Solution A and Solution C are mixed at temperature T2 and stirred for 1.5-3 hours; (5) After the stirring is completed, the mixture is cooled to room temperature to obtain a low-carbon marine fuel oil stabilizer.

[0025] Furthermore, T1 is 60-100°C; T2 is 40-60°C.

[0026] According to the third aspect of the present invention, the present invention provides a low-carbon marine fuel oil, which contains the stabilizer mentioned above.

[0027] The low-carbon marine fuel oil comprises, by weight percentage, 1% to 20% methanol, 5% to 20% light component oil, 70% to 89% residual oil, and 1% to 10% stabilizer.

[0028] Furthermore, the light component oil can be a mixture of catalytic diesel, diesel, coal diesel, hydrorefined wax oil, C9, C10 or more. The viscosity of the light component oil is in the range of 2-10 mm 2 / s, density range at 20℃ is 0.92~0.985g / cm 3 .

[0029] Furthermore, the viscosity of the residual oil at 50°C is 800-35000 mm 2 / s, density at 20℃ is 0.93~0.99g / cm 3 .

[0030] According to a fourth aspect of the present invention, the present invention also provides a method for preparing the above-mentioned low-carbon marine fuel oil.

[0031] Specifically, the preparation method includes the following contents: (a) adding a certain amount of stabilizer into methanol, and performing emulsification and homogenization by an emulsifier to obtain a mixed solution M; (b) slowly adding the mixed solution M into the light component oil under stirring, and continuously stirring for 30 to 90 minutes to obtain a fully emulsified mixed oil N; (c) At a certain temperature, the mixed oil N is added to the residual oil at a certain rate and stirred for more than 30 minutes to obtain a blended low-carbon marine fuel oil product.

[0032] Furthermore, the rotation speed of the homogenizing head of the emulsifier in step (a) is not less than 2000 r / min.

[0033] Furthermore, the temperature in step (c) is 50°C to 80°C.

[0034] Furthermore, in step (c), the mixed oil N is added at a rate of 25-100 ml / min per liter of the mixture.

[0035] In the present invention, the stabilizer is modified by methanol, emulsified and gradually blended. Methanol is modified by the amphiphilic substance and solubilizing component in the stabilizer to make it easier to emulsify with hydrocarbons in the oil. First, it is emulsified with the light component oil, and then slowly mixed with the heavy component, so that the emulsion molecules of the stabilizer / methanol / light component oil slowly diffuse into the heavy component oil, and finally a uniform and stable low-carbon marine fuel oil is formed.

[0036] Compared with the prior art, the present invention has the following advantages: 1. The present invention adopts the compounding of two kinds of block polymers, one of which is a diblock copolymer of an amphiphilic block polymer polyisobutylene succinic anhydride and polyalkylene glycol or polyoxyalkylene mixed with long-chain alcohols, and methanol is modified by stirring with methanol for a long time. Methanol molecules are combined with alcohol and amphiphilic block polymers through the action of bonds to form long-chain molecular groups. In addition, since the alcohol carbon chain has the effect of hydrocarbons, it is easy to mix with hydrocarbons in oil, and this two-way dissolution effect increases the mixed solubility performance between each component. At the same time, the component with emulsification in the stabilizer is used to promote the system to form a uniformly dispersed emulsified system, so that methanol can be stably dispersed in fuel oil. Another block polymer is alkylphenol polyoxyethylene-polyoxypropylene alcohol ether, which is mainly used for emulsification and viscosity reduction of residual oil.

[0037] 2. The preparation method of the stabilizer provided by the present invention adopts a step-by-step mixing method, wherein the fatty amine and fatty acid lipids are first melted at high temperature, and then auxiliary agents and surfactants are added, and finally a mixture of alcohols and amphiphilic block polymers is added, thereby avoiding the repulsion caused by different polarities, allowing the various components of the stabilizer to be evenly mixed in each step, thereby improving the solubility and stability of each component.

[0038] 3. In the method for using the stabilizer provided by the present invention, a step-by-step mixing method is adopted, where the stabilizer is first mixed with methanol to modify and activate it, then mixed with light oil to improve its lipophilicity, and finally mixed with other heavy components to form a fuel oil stabilization system. On the one hand, the stabilizer exerts its activation performance on methanol, and on the other hand, the stabilizer enhances the mixing effect of the system at each step, giving full play to the stabilizer's emulsification and dissolution-promoting effects. Implementation

[0039] The scheme and effects of the present invention are further illustrated by the following examples, but they do not constitute a limitation of the present invention.

[0040] The blended fuel oil used in this embodiment is residual oil and light component oil from different refineries, and its main physical and chemical properties are shown in Table 1.

[0041] Table 1 Physical and chemical properties of fuel oil blended from different refineries project Residue 1 Light component oil 1 Residue 2 Light component oil 2 <![CDATA[Viscosity, mm 2 / s]]> 125.71 2.70 3430 9.3 <![CDATA[Density, g / cm 3 > 0.9665 0.9291 0.9882 0.9793 Example 1

[0042] 150g of n-octanol, 200g of polyisobutenyl succinic anhydride-polyoxyethylene with a polyisobutenyl succinic anhydride unit content of 50% and a molecular weight of 20,000 and 190g of 22# hydrogenated white oil were mixed evenly to obtain a mixed solution I for standby use. 100g of butanediamine, 20g of methyl palmitate and 200g of 22# hydrogenated white oil were mixed evenly at 85°C, and then 50g of defoamer polyether-modified trisiloxane was added and mixed evenly, and then 10g of polyoxyethylene with an alkyl number of 9, an addition number ratio of polyoxyethylene to polyoxypropylene of 60:40, and a polyoxyethylene group (-(CH 2 CH 2 O) n -) and alkylphenol polyoxyethylene polyoxypropylene alcohol ether with a polymerization degree n of 50 were mixed evenly, and then 80g of Tween 60 was added and mixed evenly to obtain a mixed solution II. The mixed solutions I and II were stirred at 50°C for 2 hours and then cooled to room temperature to obtain a low-carbon marine fuel oil stabilizer S1.

[0043] 4g of stabilizer S1 was added to 12g of methanol, and emulsified and homogenized by an emulsifier, the speed of the homogenizer head of the emulsifier was 3000r / min, and then the mixed solution was added to 10g of light component oil 1 under stirring conditions, and the stirring was continued for 60min, and then the fully emulsified mixed oil was added to 74g of residual oil 1 at a rate of 50 ml / min per liter of the mixture under closed conditions of 60°C, and stirred for more than 30min to obtain a blended low-carbon marine fuel oil product C-1. The blended low-carbon marine fuel oil is composed of: by weight percentage, 12% methanol, 10% light component oil, 74% residual oil, and 4% stabilizer. Example 2

[0044] 180g of isoamyl alcohol, 120g of polyisobutenyl succinic anhydride-polyoxyethylene with a polyisobutenyl succinic anhydride unit content of 40% and a molecular weight of 400000 and 240g of 46# hydrogenated white oil were mixed evenly to obtain a mixed solution I for standby use. 20g of propylene diamine, 40g of ethyl laurate and 230g of 46# hydrogenated white oil were mixed evenly at 95°C, and then 90g of defoamer polyether-modified heptamethyl trisiloxane was added and mixed evenly, and then 25g of alkylphenol polyoxyethylene polyoxypropylene alcohol ether with an alkyl number of 16, an addition number ratio of polyoxyethylene to polyoxypropylene of 70:30, and a polymerization degree n of polyoxyethylene group (-(CH2CH2O)n-) of 20 was added and mixed evenly, and then 55g of Tween 80 was added and mixed evenly to obtain a mixed solution II. The mixed solution I and the mixed solution II were stirred at 55° C. for 2 hours and then cooled to room temperature to obtain a low-carbon marine fuel oil stabilizer S2.

[0045] 7g of stabilizer S2 is added to 1.5g of methanol, and emulsified and homogenized by an emulsifier, the speed of the homogenizer head of the emulsifier is 4000r / min, and then the mixed liquid is added to 5.5g of light component oil 2 under stirring conditions, and the stirring is continued for 90min, and then the fully emulsified mixed oil is added to 86g of residual oil 2 at a rate of 75 ml / min per liter of the mixture under closed conditions of 75°C, and stirred for more than 30min to obtain a blended low-carbon marine fuel oil product C-2. The blended low-carbon marine fuel oil is composed of: by weight percentage, 1.5% of methanol, 5.5% of light component oil, 86% of residual oil, and 7% of stabilizer. Example 3

[0046] 120g of n-hexanol, 280g of polyisobutenyl succinic anhydride-polyoxyethylene with a polyisobutenyl succinic anhydride unit content of 30% and a molecular weight of 50,000 and 170g of 7# hydrogenated white oil were mixed evenly to obtain a mixed solution I for standby use. 140g of pentamethylenediamine, 45g of methyl stearate and 160g of 7# hydrogenated white oil were mixed evenly at 75°C, and then 30g of defoaming agent polyether-modified polydimethylsiloxane was added and mixed evenly, and then 5g of polyoxyethylene group (-(CH2CH2O)) with an alkyl number of 10, a polyoxyethylene and polyoxypropylene addition number ratio of 80:20, and a polyoxyethylene group (-(CH2CH2O) n -) and alkylphenol polyoxyethylene polyoxypropylene alcohol ether with a polymerization degree n of 80 were mixed evenly, and then 50g of Tween 60 was added and mixed evenly to obtain a mixed solution II. The mixed solutions I and II were stirred at 45°C for 2 hours and then cooled to room temperature to obtain a low-carbon marine fuel oil stabilizer S3.

[0047] 2g of stabilizer S3 is added to 15g of methanol, and emulsified and homogenized by an emulsifier, the speed of the homogenizer head of the emulsifier is 3500r / min, and then the mixed liquid is added to 13g of light component oil 1 under stirring conditions, and the stirring is continued for 30min, and then the fully emulsified mixed oil is added to 70g of residual oil 2 at a rate of 30 ml / min per liter of the mixture under closed conditions of 50°C, and stirred for more than 30min to obtain a blended low-carbon marine fuel oil product C-3. The blended low-carbon marine fuel oil is composed of: by weight percentage, 15% methanol, 13% light component oil, 70% residual oil, and 2% stabilizer. Example 4

[0048] 160g of isoheptanol, 150g of polyisobutenyl succinic anhydride-polyoxyethylene with a polyisobutenyl succinic anhydride unit content of 60% and a molecular weight of 150,000 and 220g of 15# hydrogenated white oil were mixed evenly to obtain a mixed solution I for standby use. 70g of ethylenediamine, 30g of methyl laurate and 220g of 15# hydrogenated white oil were mixed evenly at 70°C, and then 60g of defoamer polyether-modified trisiloxane was added and mixed evenly, and then 20g of polyoxyethylene group (-(CH 2 CH 2 O) n -) and alkylphenol polyoxyethylene polyoxypropylene alcohol ether with a polymerization degree n of 15 were mixed evenly, and then 70g of Tween 80 was added and mixed evenly to obtain a mixed solution II. The mixed solutions I and II were stirred at 50°C for 2 hours and then cooled to room temperature to obtain a low-carbon marine fuel oil stabilizer S4.

[0049] 3g of stabilizer S4 is added to 8g of methanol, emulsified and homogenized by an emulsifier, the speed of the homogenizer head of the emulsifier is 5000r / min, and then the mixed liquid is added to 17g of light component oil 2 under stirring conditions, and the stirring is continued for 50min, and then the fully emulsified mixed oil is added to 72g of residual oil 1 at a rate of 60 ml / min per liter of the mixture under closed conditions of 55°C, and stirred for more than 30min to obtain a blended low-carbon marine fuel oil product C-4. The blended low-carbon marine fuel oil is composed of: by weight percentage, 8% methanol, 17% light component oil, 72% residual oil, and 3% stabilizer.

[0050] Comparative Example 1 According to the preparation method of Example 1, but without adding alkylphenol polyoxyethylene-polyoxypropylene alcohol ether during the preparation process, a blended low-carbon marine fuel oil product D-1 was obtained.

[0051] Comparative Example 2 According to the preparation method of Example 1, but without adding polyisobutenyl succinic anhydride-polyethylene oxide during the preparation process, a blended low-carbon marine fuel oil product D-2 is obtained.

[0052] Comparative Example 3 According to the preparation method of Example 1, but without adding fatty amine and fatty acid ester during the preparation process, a blended low-carbon marine fuel oil product D-3 is obtained.

[0053] Comparative Example 4 Compared with Example 1, the formula is the same, but the process of preparing the stabilizer is changed to adding n-octanol at 50° C., the content of the polyisobutenyl succinic anhydride unit is 50%, the molecular weight of the polyisobutenyl succinic anhydride-polyethylene oxide is 20000, butanediamine, methyl palmitate, the defoaming agent polyether modified trisiloxane, the alkyl number is 9, the addition number ratio of polyoxyethylene to polyoxypropylene is 60:40, the polyoxyethylene group (-(CH 2 CH 2 O) n -) alkylphenol polyoxyethylene polyoxypropylene alcohol ether with a polymerization degree n of 50 and Tween 60 are mixed evenly.

[0054] According to the formula and method for preparing the low-carbon marine fuel oil product in Example 1, the above stabilizer was added to methanol, emulsified and homogenized by an emulsifier, and then the mixed liquid was added to the light component oil 1 under stirring conditions, and the stirring was continued for 60 minutes. Then, under the condition of sealing at 60°C, the fully emulsified mixed oil was added to the residual oil 1 at a rate of adding per liter of the mixture, and stirred for more than 30 minutes to obtain the blended low-carbon marine fuel oil product D-4. Comparative Example 5 The stabilizer S1 was prepared according to the preparation method of Example 1. The formula in the process of blending the low-carbon marine fuel oil product was consistent with that in Example 1, but the steps were changed to stabilizer S1, methanol, light component oil 1 and residual oil 1, and they were mixed and stirred at the same time under closed conditions at 60° C. for more than 30 minutes to obtain a blended low-carbon marine fuel oil product D-5.

[0055] The physicochemical properties and stability test results of the above examples and comparative examples are shown in Table 2.

[0056] Table 2 Physicochemical properties and stability of samples of examples and comparative examples sample <![CDATA[Viscosity, mm / s 2 (at 50 °C)]]> <![CDATA[Density, kg / m 3 (at 20 °C)]]> Storage stability C1 98.2 0.9630 >30 days without delamination C2 135.7 0.9875 >30 days without delamination C3 116.0 0.9581 >30 days without delamination C4 86.3 0.9672 >30 days without delamination D1 110.1 0.9721 Stratification after 8 days D2 100.4 0.9533 Stratification after 3 days D3 102.4 0.9700 Stratification after 12 days D4 96.9 0.9691 Stratification after 10 days D5 103.6 0.9701 Stratification after 8 days

Claims

1. A low-carbon marine fuel oil stabilizer, characterized in that: The composition comprises, by weight percentage, 1-15% fatty amine, 1.5-5% fatty acid esters, 10-20% alcohols, 0.1-3% alkylphenol polyoxyethylene-polyoxypropylene alcohol ether, 10-30% amphiphilic block polymer, 5-10% Tween, 3-10% defoamer, and the balance is hydrogenated white oil.

2. The fuel oil stabilizer according to claim 1, characterized in that The fatty amine is a primary amine, preferably at least one of ethylenediamine, propylenediamine, butylenediamine or hexamethylenediamine.

3. The fuel oil stabilizer according to claim 1, characterized in that: The fatty acid esters include fatty acid methyl esters, fatty acid ethyl esters or a mixture of the two or more thereof, and the carbon chain atoms of the fatty acid are 12-18.

4. The fuel oil stabilizer according to claim 1, characterized in that: The alcohols are normal or isomeric alcohols with a carbon atom chain length of 4 to 9.

5. The fuel oil stabilizer according to claim 1, characterized in that: The alkylphenol in the alkylphenol polyoxyethylene-polyoxypropylene alcohol ether is selected to have an alkyl group with a carbon number of 8 to 18, the addition ratio of polyoxyethylene to polyoxypropylene is 50:50 to 95:5, and the polyoxyethylene group (-(CH2CH2O) n -) has a degree of polymerization n of 10~90.

6. The fuel oil stabilizer according to claim 1, characterized in that: The amphiphilic block polymer is a diblock copolymer of polyisobutenyl succinic anhydride and polyalkylene glycol or polyoxyalkylene; wherein the content of the polyisobutenyl succinic anhydride unit is 30% to 60% and the molecular weight is 15,000 to 500,000.

7. The fuel oil stabilizer according to claim 1, characterized in that: The Tween is one or a mixture of two of Tween-60 series and Tween-80 series.

8. The method for preparing the low-carbon marine fuel oil stabilizer according to any one of claims 1 to 7, characterized in that: Includes the following: (1) First, alcohols, amphiphilic block polymers and a portion of hydrogenated white oil are mixed and stirred to obtain solution A; (2) At temperature T1, the fatty amine, fatty acid lipids and the remaining hydrogenated white oil are mixed and stirred to obtain solution B; (3) At temperature T1 and under constant stirring, first add defoamer to solution B and mix evenly, then add alkylphenol polyoxyethylene polyoxypropylene alcohol ether and mix evenly, and finally add Tween and mix evenly to obtain a mixed solution C; (4) Solution A and mixed solution C are mixed at temperature T2 and stirred for 1.5-3 hours; (5) Cooling to room temperature to obtain a low-carbon marine fuel oil stabilizer.

9. The preparation method according to claim 8, characterized in that: T1 is 60-100℃, T2 is 40-60℃.

10. A low-carbon marine fuel oil, characterized in that: Contains the stabilizer according to any one of claims 1 to 7.

11. The low-carbon marine fuel oil according to claim 10, characterized in that: The low-carbon marine fuel oil comprises, by weight percentage, 1% to 20% methanol, 5% to 20% light component oil, 70% to 89% residual oil, and 1% to 10% stabilizer.

12. The low-carbon marine fuel oil according to claim 11, characterized in that: The viscosity of the light component oil is 2-10 mm 2 / s, density at 20℃ is 0.92~0.985g / cm 3 The viscosity of the residual oil at 50°C is 800-35000 mm 2 / s, density at 20℃ is 0.93~0.99g / cm 3 .

13. The method for preparing low-carbon marine fuel oil according to any one of claims 10 to 12, characterized in that: Includes the following: (a) adding a certain amount of stabilizer into methanol, and performing emulsification and homogenization by an emulsifier to obtain a mixed solution M; (b) slowly adding the mixed solution M into the light component oil under stirring, and continuously stirring for 30 to 90 minutes to obtain a fully emulsified mixed oil N; (c) At a certain temperature, the mixed oil N is added to the residual oil at a certain rate and stirred for more than 30 minutes to obtain a blended low-carbon marine fuel oil product.

14. The preparation method according to claim 13, characterized in that Therefore, the temperature in step (c) is 50°C to 80°C.

15. The preparation method according to claim 13, characterized in that: In step (c), the mixed oil N is added at a rate of 25-100 ml / min per liter of the mixture.