A diesel oil pour point depressant composition and its preparation and use

Abstract

The present application relates to the technical field of diesel oil pour point depressant, in particular to a diesel oil pour point depressant composition and its preparation and application.The diesel oil pour point depressant composition of the present application is composed of the following components with the weight percentage: polymethyl tetradecyl acrylate-3-benzoyl ethyl acrylate-acrylamide 40-55%, EVA 15-25%, lauric acid monoglyceride 15-25%, triisopropanolamine 15-25%.The diesel oil pour point depressant composition of the present application can change the crystallization behavior of diesel oil, change the growth direction of crystal and inhibit the generation of large wax crystals, so that it cannot form a three-dimensional network structure, thereby improving the low-temperature fluidity of diesel oil.

Description

Technical Field

[0001] This invention belongs to the technical field of diesel pour point depressants, and relates to a diesel pour point depressant composition and its preparation and application. Background Technology

[0002] Diesel fuel is a light petroleum product widely used in industrial transportation and agricultural production, characterized by its safety, durability, and safe storage. Diesel fuel solidifies at low temperatures due to the presence of wax (i.e., n-alkanes). As the temperature decreases, the wax gradually precipitates and forms wax crystals. When the temperature drops further, these wax crystals enlarge and form a three-dimensional network structure, clogging the diesel engine's large filter and causing the engine to stall. To address the low-temperature fluidity problem of diesel fuel, adding low-temperature fluidity improvers (i.e., pour point depressants) is currently the most flexible, economical, and efficient method. In recent years, pour point depressant technology has developed rapidly in my country. Currently, the main types of pour point depressants include methacrylates, methacrylate-maleic anhydride compounds, ethylene-vinyl acetate (EVA) compounds, polyalphaolefins, and fumarate copolymers. The addition of these pour point depressants can change the crystallization state and size of the wax, effectively improving the low-temperature fluidity of diesel fuel. However, they also have certain drawbacks, such as high dosage requirements, poor dispersibility, and limited applicability. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a diesel pour point depressant composition, its preparation, and its application. The surfactant and dispersant in the diesel pour point depressant composition of the present invention enable the diesel pour point depressant to be better dispersed and dissolved in diesel fuel, thereby improving the low-temperature flow properties of diesel fuel.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] The first object of the present invention is to provide a diesel fuel pour point depressant composition comprising the following components in weight percentage:

[0006]

[0007]

[0008] The sum of the mass percentages of the above components is 100%.

[0009] The addition of triisopropanolamine (as a surfactant) and glyceryl monolaurate (as a dispersant) in this invention further enhances the pour point depressant effect; tetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide provides long chains and polar groups, providing a large number of crystallization sites. The polar groups adsorbed on the surface of wax crystals delay the precipitation and accumulation of wax crystals, making the wax crystals uniformly distributed, thereby reducing the pour point and cold filter plugging point of diesel fuel.

[0010] In one embodiment of the present invention, the diesel pour point depressant composition comprises the following components by weight percentage:

[0011]

[0012] Or it may consist of the following components by weight percentage:

[0013]

[0014] Or it may consist of the following components by weight percentage:

[0015]

[0016] Or it may consist of the following components by weight percentage:

[0017]

[0018] Or it may consist of the following components by weight percentage:

[0019]

[0020] Or it may consist of the following components by weight percentage:

[0021]

[0022] In one embodiment of the present invention, the polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide is obtained by polymerizing tetradecyl methacrylate, ethyl 3-benzoyl acrylate and acrylamide in a toluene solution with benzoyl peroxide as a catalyst.

[0023] In one embodiment of the present invention, the molar ratio of tetradecyl methacrylate, ethyl 3-benzoyl acrylate and acrylamide is 9:1:1.

[0024] In one embodiment of the present invention, the polymerization reaction is carried out at a temperature of 110°C for 8 hours.

[0025] A second objective of this invention is to provide a method for preparing a diesel pour point depressant composition, comprising the following steps:

[0026] The target product is obtained by mixing polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate, and triisopropanolamine.

[0027] In one embodiment of the present invention, the mixture is homogenized by stirring followed by ultrasonic dispersion.

[0028] In one embodiment of the present invention, the stirring temperature is 25-40°C and the ultrasonic time is 15-20 min.

[0029] A third objective of this invention is to provide an application of a diesel pour point depressant composition in reducing the pour point and cold filter plugging point of diesel fuel, wherein the diesel pour point depressant composition is mixed with diesel fuel at 30-45°C.

[0030] In one embodiment of the present invention, the mixture is homogenized by stirring and then ultrasonically dispersing for 30 minutes.

[0031] In one embodiment of the present invention, the diesel fuel is commercially available 0# diesel fuel.

[0032] In one embodiment of the present invention, the mass ratio of the diesel pour point depressant composition to diesel oil is 1:100-1000.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) In this invention, the long-chain alkyl groups in polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide mainly undergo eutectic reaction, and the polar groups provide crystallization sites and play a dispersing role on wax crystals, changing the crystallization mode of wax crystals, inhibiting the formation of large wax crystals and three-dimensional network structures, thereby improving the low-temperature fluidity of diesel; EVA is also a pour point depressant with good effect and widely used. The surfactant triisopropanolamine and the dispersant glyceryl monolaurate have good dispersing effects on pour point depressants and wax crystals, making the pour point depressant polymer dissolve better in diesel, playing a synergistic role, and further enhancing the pour point depressant effect.

[0035] (2) The diesel pour point depressant composition of the present invention can be prepared by simply dispersing each component by ultrasound. The preparation process is simple, easy to operate and has obvious effect.

[0036] (3) The addition of a diesel pour point depressant composition of the present invention to commercially available 0# diesel can improve the dispersibility of the pour point depressant in commercially available 0# diesel, and can reduce its pour point by 10-14℃ and cold filter plugging point by 4-8℃. Detailed Implementation

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

[0038] In the following examples, the cold filter plugging point was measured according to the "SH / T0248-2006 Determination of Cold Filter Plug Point for Diesel Oil and Domestic Heating Oil", and the condensation point was measured according to the "GB510-83 Determination of Pour Point for Petroleum Products".

[0039] The specific sources of the raw materials used in the following embodiments are as follows:

[0040] 10-320 pour point depressant was purchased from Shanghai Hailian Lubricating Materials Technology Co., Ltd.; EVA was purchased from Titan Technology; glyceryl monolaurate was purchased from Titan Technology; triisopropanolamine was purchased from Titan Technology; and 0# diesel was purchased from Shanghai Songjiang Gas Station Company.

[0041] Polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide was prepared by the following method: tetradecyl methacrylate, ethyl 3-benzoyl acrylate and acrylamide (molar ratio 9:1:1) were mixed and then polymerized at 110°C for 8 hours with toluene as solvent and benzoyl peroxide as catalyst.

[0042] Unless otherwise specified, all reagents used are commercially available, and all detection methods and techniques used are conventional in this field.

[0043] Example 1

[0044] This embodiment provides a diesel pour point depressant composition and its preparation and application.

[0045] A diesel pour point depressant composition is obtained by ultrasonically dispersing polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate and triisopropanolamine at 25°C for 20 min.

[0046] The composition and mass percentage of each raw material are as follows:

[0047]

[0048]

[0049] The diesel pour point depressant composition prepared above was added to commercially available 0# diesel (mass ratio of 1:200), and after being mixed and stirred evenly at 40°C, it was ultrasonically dispersed for 25 minutes to obtain diesel containing the diesel pour point depressant composition. Compared with commercially available 0# diesel, its pour point and cold filter plugging point were reduced by 10°C and 6°C, respectively.

[0050] Example 2

[0051] This embodiment provides a diesel pour point depressant composition and its preparation and application.

[0052] A diesel pour point depressant composition is obtained by ultrasonically dispersing polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate and triisopropanolamine at 40°C for 15 min.

[0053] The composition and mass percentage of each raw material are as follows:

[0054]

[0055] The diesel pour point depressant composition prepared above was added to commercially available 0# diesel (mass ratio of 1:200), and after being mixed and stirred evenly at 40°C, it was ultrasonically dispersed for 25 minutes to obtain diesel containing the diesel pour point depressant composition. Compared with commercially available 0# diesel, its pour point and cold filter plugging point were reduced by 12°C and 5°C, respectively.

[0056] Example 3

[0057] This embodiment provides a diesel pour point depressant composition and its preparation and application.

[0058] A diesel pour point depressant composition is obtained by ultrasonically dispersing polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate and triisopropanolamine at 30°C for 15 min.

[0059] The composition and mass percentage of each raw material are as follows:

[0060]

[0061] The diesel pour point depressant composition prepared above was added to commercially available 0# diesel (mass ratio of 1:200), and after being mixed and stirred evenly at 45°C, it was ultrasonically dispersed for 25 minutes to obtain diesel containing the diesel pour point depressant composition. Compared with commercially available 0# diesel, its pour point and cold filter plugging point were reduced by 15°C and 9°C, respectively.

[0062] Example 4

[0063] This embodiment provides a diesel pour point depressant composition and its preparation and application.

[0064] A diesel pour point depressant composition is obtained by ultrasonically dispersing polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate and triisopropanolamine at 40°C for 18 min.

[0065] The composition and mass percentage of each raw material are as follows:

[0066]

[0067] The diesel pour point depressant composition prepared above was added to commercially available 0# diesel (mass ratio of 1:1000), and after being mixed and stirred evenly at 30°C, it was ultrasonically dispersed for 25 minutes to obtain diesel containing the diesel pour point depressant composition. Compared with commercially available 0# diesel, its pour point and cold filter plugging point were reduced by 13°C and 7°C, respectively.

[0068] Example 5

[0069] This embodiment provides a diesel pour point depressant composition and its preparation and application.

[0070] A diesel pour point depressant composition is obtained by ultrasonically dispersing polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate and triisopropanolamine at 40°C for 15 min.

[0071] The composition and mass percentage of each raw material are as follows:

[0072]

[0073] The diesel pour point depressant composition prepared above was added to commercially available 0# diesel (mass ratio of 1:100), and after being mixed and stirred evenly at 40°C, it was ultrasonically dispersed for 25 minutes to obtain diesel containing the diesel pour point depressant composition. Compared with commercially available 0# diesel, its pour point and cold filter plugging point were reduced by 11°C and 6°C, respectively.

[0074] Example 6

[0075] This embodiment provides a diesel pour point depressant composition and its preparation and application.

[0076] A diesel pour point depressant composition is obtained by ultrasonically dispersing polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate and triisopropanolamine at 40°C for 15 min.

[0077] The composition and mass percentage of each raw material are as follows:

[0078]

[0079] The diesel pour point depressant composition prepared above was added to commercially available 0# diesel (mass ratio of 1:200), and after being mixed and stirred evenly at 40°C, it was ultrasonically dispersed for 25 minutes to obtain diesel containing the diesel pour point depressant composition. Compared with commercially available 0# diesel, its pour point and cold filter plugging point were reduced by 12°C and 4°C, respectively.

[0080] Comparative Example 1

[0081] The polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide used in Example 1 was not mixed with EVA, glyceryl monolaurate and triisopropanolamine, but was directly added to commercially available No. 0 diesel at a mass ratio of 1:200. After being mixed and stirred evenly at 40°C, it was ultrasonically dispersed for 25 minutes until completely dissolved. After testing, compared with commercially available No. 0 diesel, its condensation point and cold filter plugging point were reduced by 6°C and 3°C, respectively.

[0082] By comparing this comparative example with Comparative Example 1, it can be seen that the diesel pour point depressant composition composed of polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate and triisopropanolamine improves the pour point depressant effect by increasing the solubility and dispersibility of the pour point depressant in diesel and through the synergistic effect between the pour point depressants, thus effectively improving the low-temperature fluidity of diesel.

[0083] Comparative Example 2

[0084] Commercially available polymethyl methacrylate pour point depressant 10-320 was added to commercially available No. 0 diesel (mass ratio 1:200), and after being mixed and stirred evenly at 40°C, it was ultrasonically dispersed for 25 minutes to obtain diesel containing polymethyl methacrylate pour point depressant 10-320. Compared with commercially available No. 0 diesel, its pour point and cold filter plugging point were reduced by 6°C and 2°C, respectively.

[0085] By comparing this comparative example with Example 2, it can be seen that the diesel pour point depressant composition composed of polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate and triisopropanolamine has a stronger sensitivity to diesel fuel and a better pour point depressant effect.

[0086] Comparative Example 3

[0087] Except for the absence of EVA, everything else is the same as in Example 1.

[0088] Compared with commercially available No. 0 diesel, its condensation point and cold filter plugging point are reduced by 5°C and 3°C, respectively.

[0089] By comparing this comparative example with Example 1, it can be seen that the diesel pour point depressant composition composed of EVA mixed with polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, glyceryl monolaurate and triisopropanolamine has a stronger sensitivity to diesel fuel and a better pour point depressant effect.

[0090] Comparative Example 4

[0091] Except for the absence of glyceryl monolaurate, everything else was the same as in Example 1.

[0092] Compared to commercially available #0 diesel, its condensation point and cold filter plugging point are reduced by 6°C and 4°C, respectively.

[0093] By comparing this comparative example with Example 1, it can be seen that the diesel pour point depressant composition composed of glyceryl monolaurate mixed with polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA and triisopropanolamine has a stronger sensitivity to diesel fuel and a better pour point depressant effect.

[0094] Comparative Example 5

[0095] Except for the absence of triisopropanolamine, everything else was the same as in Example 1.

[0096] Compared with commercially available No. 0 diesel, its condensation point and cold filter plugging point are reduced by 4°C and 4°C, respectively.

[0097] By comparing this comparative example with Example 1, it can be seen that the diesel pour point depressant composition composed of triisopropanolamine mixed with polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA and glyceryl monolaurate has a stronger sensitivity to diesel fuel and a better pour point depressant effect.

[0098] Comparative Example 6

[0099] Except for replacing triisopropanolamine with an equal mass of polypropylene glycol, everything else is the same as in Example 1.

[0100] Compared with commercially available No. 0 diesel, its condensation point and cold filter plugging point are reduced by 5°C and 3°C, respectively.

[0101] By comparing this comparative example with Example 1, it can be seen that the diesel pour point depressant composition composed of polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate and triisopropanolamine is more sensitive to diesel fuel and has a better pour point depressant effect.

[0102] In summary, the present invention provides a diesel pour point depressant composition in which the long alkyl chain of tetradecyl methacrylate can undergo eutectic reaction to effectively improve the low-temperature flow properties of diesel fuel. Ethyl 3-benzoyl acrylate-acrylamide provides its corresponding polar groups, enhancing the dispersibility of the pour point depressant and allowing for better contact with wax crystals. This enables the pour point depressant to be better adsorbed onto the surface of the wax crystals and ensures uniform distribution of the wax crystals, thereby reducing the pour point and cold filter plugging point of the diesel fuel. EVA polymer is also a widely used and effective pour point depressant polymer, in which glyceryl monolaurate and triisopropanolamine are good pour point depressant solvents, allowing the pour point depressant composition to be uniformly and efficiently dispersed in diesel fuel, while also playing a synergistic role, thus further enhancing the pour point depressant effect. When added to commercially available 0# diesel fuel, the resulting diesel fuel containing the pour point depressant composition has a reduced pour point and cold filter plugging point of 10-18°C and 5-10°C, respectively. The pour point depressant effect of the diesel pour point depressant composition of the present invention is superior to that of commercially available pour point depressants.

[0103] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the interpretation of the present invention, without departing from the scope of the invention, should be within the protection scope of the present invention.

Claims

1. A diesel fuel pour point depressant composition, characterized in that, It consists of the following components by weight percentage: Or it may consist of the following components by weight percentage: Or it may consist of the following components by weight percentage: Or it may consist of the following components by weight percentage: Or it may consist of the following components by weight percentage: Or it may consist of the following components by weight percentage: In this process, the long-chain alkyl groups in polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide undergo eutectic reaction, and the polar groups provide crystallization sites and play a dispersing role. EVA acts as a pour point depressant, glyceryl monolaurate acts as a dispersant, and triisopropanolamine acts as a surfactant. The polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide is obtained by polymerizing tetradecyl methacrylate, ethyl 3-benzoyl acrylate and acrylamide in a toluene solution with benzoyl peroxide as a catalyst; the molar ratio of tetradecyl methacrylate, ethyl 3-benzoyl acrylate and acrylamide is 9:1:

1.

2. The diesel pour point depressant composition according to claim 1, characterized in that, The polymerization reaction was carried out at a temperature of 110℃ for 8 hours.

3. A method for preparing a diesel pour point depressant composition as described in any one of claims 1-2, characterized in that, Includes the following steps: The desired product is obtained by mixing polytetradecyl methacrylate-ethyl 3-benzoyl acrylate-acrylamide, EVA, glyceryl monolaurate, and triisopropanolamine.

4. The method for preparing a diesel pour point depressant composition according to claim 3, characterized in that, The mixture is homogenized by ultrasonic dispersion after stirring.

5. The method for preparing a diesel pour point depressant composition according to claim 4, characterized in that, The stirring temperature is 25-40℃, and the ultrasonic time is 15-20 min.

6. The application of a diesel pour point depressant composition as described in any one of claims 1-2 in improving diesel fuel performance, characterized in that, Mix the diesel pour point depressant composition with diesel fuel at 30-45°C.

7. The application of the diesel pour point depressant composition according to claim 6 in reducing the pour point and cold filter plugging point of diesel fuel, characterized in that, The mass ratio of the diesel pour point depressant composition to diesel fuel is 1:100-1000.

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