阅读说明：本技术 一种柴油降凝剂及其制备方法与应用 (Diesel oil pour point depressant and preparation method and application thereof ) 是由 韩生 杨太顺 陈凤飞 张方 解麦莹 殷素雅 薛原 蔺华林 于 2019-08-13 设计创作，主要内容包括：本发明涉及一种柴油降凝剂及其制备方法与应用,柴油降凝剂包括以下重量份数的组分：非离子表面活性剂40-60份,甲基丙烯酸十四酯-甲基丙烯酸缩水甘油酯共聚物40-60份。与现有技术相比,本发明的柴油降凝剂中含有非离子表面活性剂,将该柴油降凝剂加入到柴油中,经测试可将柴油的冷凝点降低16-19℃、冷滤点降低6-9℃,进一步改善了柴油低温流动性差的问题,为进一步的推广使用提供了方向。(The invention relates to a diesel pour point depressant, a preparation method and application thereof, wherein the diesel pour point depressant comprises the following components in parts by weight: 40-60 parts of nonionic surfactant and 40-60 parts of tetradecyl methacrylate-glycidyl methacrylate copolymer. Compared with the prior art, the diesel oil pour point depressant contains the nonionic surfactant, and the diesel oil pour point depressant is added into diesel oil, so that the condensation point of the diesel oil can be reduced by 16-19 ℃ and the cold filter plugging point can be reduced by 6-9 ℃ through tests, the problem of poor low-temperature fluidity of the diesel oil is further solved, and a direction is provided for further popularization and application.)

1. The diesel pour point depressant is characterized by comprising the following components in parts by weight: 40-60 parts of nonionic surfactant and 40-60 parts of tetradecyl methacrylate-glycidyl methacrylate copolymer.

2. The diesel pour point depressant according to claim 1, wherein the nonionic surfactant comprises two of fatty acid methyl ester ethoxylate and tween 80, and the addition amount of the fatty acid methyl ester ethoxylate is 10-30 parts and the addition amount of the tween 80 is 20-40 parts in 40-60 parts of the nonionic surfactant.

3. the diesel pour point depressant of claim 1, wherein the tetradecyl methacrylate-glycidyl methacrylate copolymer is prepared by:

Mixing the tetradecyl methacrylate and the glycidyl methacrylate, adding the mixture and benzoyl peroxide into a solvent, and heating for reaction to obtain the tetradecyl methacrylate-glycidyl methacrylate copolymer.

4. The diesel pour point depressant according to claim 3, wherein the molar ratio of tetradecyl methacrylate to glycidyl methacrylate is (2-4): 1.

5. The diesel oil pour point depressant according to claim 3, wherein the mass ratio of the benzoyl peroxide to the mixture of the tetradecyl methacrylate and the glycidyl methacrylate is 1 (95-105).

6. The diesel pour point depressant according to claim 3, wherein the mass ratio of the mixture of tetradecyl methacrylate and glycidyl methacrylate to the solvent is 4: 1.

7. A diesel pour point depressant according to claim 3 wherein said solvent is toluene.

8. The method for preparing the diesel oil pour point depressant according to any one of claims 1 to 7, wherein the target product diesel oil pour point depressant is obtained by uniformly mixing the nonionic surfactant and the tetradecyl methacrylate-glycidyl methacrylate copolymer.

9. The use of a diesel pour point depressant according to any one of claims 1 to 7, wherein, in use, the diesel pour point depressant is added to diesel, wherein the diesel pour point depressant is present in the diesel in an amount of 0.1 to 0.2 percent by weight.

10. the use of a diesel pour point depressant according to claim 9, wherein the diesel pour point depressant is ultrasonically dispersed at 35-45 ℃ for 25-35min after being added to diesel.

Technical Field

The invention belongs to the technical field of diesel pour point depressants, and relates to a diesel pour point depressant, and a preparation method and application thereof.

Background

In northern China and some cold areas, the diesel engine cannot be normally used due to low temperature, and the daily life of people is greatly influenced. This is mainly because, in a low-temperature environment, the solubility of normal paraffins in diesel oil decreases, and the normal paraffins precipitate in the form of crystals, and as the size and number of the crystals change, a three-dimensional network structure is formed, so that the low-temperature fluidity of diesel oil deteriorates.

Various methods are explored at home and abroad to solve the problem of low-temperature fluidity of diesel oil, and the advantages of simple operation and convenient use due to the addition of the pour point depressant become a commonly applied method at present. The multiple types of pour point depressants have single pertinence to oil products and poor pour point depressing effect, and the compound pour point depressants play respective roles of a main agent and an auxiliary agent, so that the expansion of the pour point depressing range is the key point of the current application research.

for example, chinese patent 201811597071.9 discloses a method for preparing a pour point depressant for diesel oil, which comprises preparing higher ester of methacrylic acid by direct esterification method using methacrylic acid and polyhydric alcohol as raw materials, toluene as solvent and water carrying agent, p-toluenesulfonic acid as catalyst, and hydroquinone as polymerization inhibitor; and then under the protection of nitrogen, adding higher methacrylate, maleic anhydride and vinyl acetate in a certain proportion into a reaction kettle, heating to the reaction temperature, adding a certain amount of initiator, polymerizing for 6-8 hours at constant temperature, and drying with anhydrous calcium chloride to obtain the faint yellow viscous liquid pour point depressant. This patent suffers from poor economics due to the increase in polymerized monomers and the reliance solely on terpolymers as diesel pour point depressants, which have an overall increased cost.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a diesel pour point depressant, a preparation method and application thereof. The cost is reduced by using binary polymers. The nonionic surfactant is mixed with the copolymer for use, so that the applicability is better.

The purpose of the invention can be realized by the following technical scheme:

one of the technical schemes of the invention is to provide a diesel pour point depressant which comprises the following components in parts by weight: 40-60 parts of nonionic surfactant and 40-60 parts of tetradecyl methacrylate-glycidyl methacrylate copolymer.

Further, the nonionic surfactant comprises two of fatty acid methyl ester ethoxylate and tween 80, and in 40-60 parts of the nonionic surfactant, the addition amount of the fatty acid methyl ester ethoxylate is 10-30 parts, and the addition amount of the tween 80 is 20-40 parts.

Further, the tetradecyl methacrylate-glycidyl methacrylate copolymer is prepared by the following steps:

Mixing the tetradecyl methacrylate and the glycidyl methacrylate, adding the mixture and benzoyl peroxide into a solvent, and heating for reaction to obtain the tetradecyl methacrylate-glycidyl methacrylate copolymer.

Furthermore, the molar ratio of the tetradecyl methacrylate to the glycidyl methacrylate is (2-4): 1.

Furthermore, the mass ratio of the benzoyl peroxide to the mixture of the tetradecyl methacrylate and the glycidyl methacrylate is 1 (95-105).

Furthermore, the mass ratio of the mixture of the tetradecyl methacrylate and the glycidyl methacrylate to the solvent is 4: 1.

Further, the solvent is toluene.

the second technical scheme of the invention is to provide a preparation method of the diesel oil pour point depressant, which is to uniformly mix the nonionic surfactant and the tetradecyl methacrylate-glycidyl methacrylate copolymer to obtain the target product diesel oil pour point depressant.

The third technical scheme of the invention is to provide the application of the diesel pour point depressant, when in use, the diesel pour point depressant is added into diesel, wherein the mass percentage of the diesel pour point depressant in the diesel is 0.1-0.2%.

Further, after the diesel pour point depressant is added into the diesel, the mixture is subjected to ultrasonic dispersion for 25-35min at the temperature of 35-45 ℃.

The molar ratio of the tetradecyl methacrylate to the glycidyl methacrylate is in a proper range, so that the better pour point depressing effect can be exerted, and if the molar ratio is higher than an upper limit value or lower than a lower limit value, the polarity and the solubility of the copolymer pour point depressant are changed, so that the pour point depressing effect is influenced. If the polar group content is too high, the capability of eutectic precipitation with wax is reduced; if the polar group content is too low, a good dispersing effect on wax crystals cannot be formed. The addition of other raw materials has the best proportion, and the addition is too much or too little; the reaction temperature has the most appropriate reaction range, and the excessive high or low reaction temperature can influence the reaction and the product generation, thereby influencing the pour point depression effect.

in the invention, in the tetradecyl methacrylate-glycidyl methacrylate polymer, the alkyl long chain is matched with the carbon number of normal alkane in diesel oil, and eutectic effect is generated in wax crystals, so that a three-dimensional network structure is inhibited, and the best pour point depressing effect is achieved. Polar groups are attached to the surface of wax crystal molecules, so that the precipitation of crystals is inhibited, the shape and the crystallization mode of the wax crystals are changed, and the wax crystals are better dispersed.

In the invention, the nonionic surfactant fatty acid methyl ester ethoxylate and tween 80 have synergistic effect, so that wax crystal particles are not easy to aggregate to form a network structure, and the wax crystal particles have better dispersing effect.

In the invention, when the tetradecyl methacrylate-glycidyl methacrylate copolymer is compounded with the nonionic surfactant, the polarity in the nonionic surfactant plays a role in shielding the normal alkane, so that the condition that the solubility of the normal alkane in the diesel oil is reduced at low temperature is avoided, the low-temperature fluidity of the diesel oil is improved, and the pour point depression effect of the diesel oil is improved.

Compared with the prior art, the practical diesel oil pour point depressant contains the nonionic surfactant, and the practical diesel oil pour point depressant is added into the diesel oil, so that the condensation point of the diesel oil can be reduced by 16-19 ℃ and the cold filter plugging point can be reduced by 6-9 ℃ through tests, the problem of poor effect of the diesel oil pour point depressant at low temperature is solved, the low-temperature fluidity of the diesel oil can be further improved, and the low-temperature fluidity of the diesel oil is improved.

Drawings

FIG. 1 is a nuclear magnetic resonance (1HNMR) spectrum of a tetradecyl methacrylate-glycidyl methacrylate copolymer prepared in example 1;

FIG. 2 is an IR spectrum of a tetradecyl methacrylate-glycidyl methacrylate copolymer prepared in example 1.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

each raw material used in the following examples is a commercially available product. Wherein: the 0# diesel oil is purchased from Shanghai Songjiang gasoline station, the fatty acid methyl ester ethoxylate is purchased from Shandong Youso chemical technology Co., Ltd, and the Tween 80 is purchased from national drug group chemical reagent Co., Ltd. The remainder, unless otherwise indicated, are all conventional commercial materials or conventional processing techniques in the art.

the measuring method of the condensation point is carried out according to GB510-83 petroleum product condensation point determination, and the measuring method of the cold filter plugging point is carried out according to SH/T0248-2006 diesel oil and civil heating oil cold filter plugging point determination.