阅读说明：本技术 一种含非离子表面活性剂的柴油降凝剂及其制备和应用 (Diesel oil pour point depressant containing nonionic surfactant and preparation and application thereof ) 是由 韩生 杨太顺 殷素雅 解麦莹 陈凤飞 蔺华林 薛原 于 2019-08-13 设计创作，主要内容包括：本发明涉及一种含非离子表面活性剂的柴油降凝剂及其制备和应用,柴油降凝剂包括以下重量百分比的组分：非离子表面活性剂40-80％,甲基丙烯酸十四酯-N-乙烯基吡咯烷酮共聚物20-60％。与现有技术相比,本发明含非离子表面活性剂的柴油降凝剂中含有两种非离子表面活性剂,将该含非离子表面活性剂的柴油降凝剂加入到柴油中,经测试可将柴油的冷凝点降低12-17℃、冷滤点降低6-11℃,有效解决了柴油在低温下流动性差的问题,能够使柴油具有更广泛的应用前景。(The invention relates to a diesel oil pour point depressant containing a nonionic surfactant, and preparation and application thereof, wherein the diesel oil pour point depressant comprises the following components in percentage by weight: 40-80% of nonionic surfactant and 20-60% of tetradecyl methacrylate-N-vinyl pyrrolidone copolymer. Compared with the prior art, the diesel oil pour point depressant containing the nonionic surfactant contains two nonionic surfactants, and the diesel oil pour point depressant containing the nonionic surfactant is added into diesel oil, so that the condensation point of the diesel oil can be reduced by 12-17 ℃ and the cold filter plugging point can be reduced by 6-11 ℃ through tests, the problem of poor fluidity of the diesel oil at low temperature is effectively solved, and the diesel oil has wider application prospect.)

1. A diesel pour point depressant containing a nonionic surfactant is characterized by comprising the following components in percentage by weight: 40-80% of nonionic surfactant and 20-60% of tetradecyl methacrylate-N-vinyl pyrrolidone copolymer.

2. The diesel pour point depressant containing the nonionic surfactant according to claim 1, wherein the nonionic surfactant is triethanolamine oleate soap and/or span 80, and when the nonionic surfactant and the triethanolamine oleate soap and/or span 80 are added simultaneously, the mass ratio of (1-3): (1-3).

3. The non-ionic surfactant-containing diesel pour point depressant according to claim 1, wherein the tetradecyl methacrylate-N-vinyl pyrrolidone copolymer is prepared by the following method:

Mixing the tetradecyl methacrylate and the N-vinyl pyrrolidone, adding the mixture and benzoyl peroxide into toluene, and heating to react to obtain the tetradecyl methacrylate-N-vinyl pyrrolidone copolymer.

4. the nonionic surfactant-containing diesel pour point depressant according to claim 3, wherein the molar ratio of tetradecyl methacrylate to N-vinylpyrrolidone is (10-15): 1.

5. The nonionic surfactant-containing diesel pour point depressant according to claim 3, wherein the mass ratio of the benzoyl peroxide to the mixture of the tetradecyl methacrylate and the N-vinyl pyrrolidone is 1 (95-105).

6. The nonionic surfactant-containing diesel pour point depressant according to claim 3, wherein the mass ratio of toluene to the mixture of tetradecyl methacrylate and N-vinylpyrrolidone is 1 (3-5).

7. The nonionic surfactant-containing diesel pour point depressant according to claim 3, wherein the heating reaction conditions are as follows: reacting for 8-10h at 110-130 ℃.

8. The method for preparing the diesel pour point depressant containing the nonionic surfactant as claimed in any one of claims 1 to 7, wherein the nonionic surfactant is uniformly mixed with the tetradecyl methacrylate-N-vinyl pyrrolidone copolymer to obtain the diesel pour point depressant containing the nonionic surfactant.

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

10. The use of the nonionic surfactant-containing diesel pour point depressant according to claim 9, wherein the nonionic surfactant-containing diesel pour point depressant is added to diesel and then ultrasonically dispersed at 35-45 ℃ for 25-35 min.

Technical Field

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

background

Diesel is a middle distillate consisting of normal paraffins and other hydrocarbons. At low temperature, the solubility of hydrocarbons in the diesel oil is reduced, so that wax crystals are separated out in the form of crystals, and the wax crystals are gathered together under the action of trouble to finally form a three-dimensional network structure, so that the residual diesel oil is wrapped in the three-dimensional network structure, and the low-temperature flow property of the diesel oil is influenced. At present, the pour point depressant is added into diesel oil, which is the most effective way for improving the fluidity of the diesel oil, and the cold filter plugging point and the condensation point can be effectively reduced by adding a small amount of the pour point depressant, so that the low-temperature fluidity of the diesel oil is further improved.

Currently developed diesel pour point depressants mainly comprise ethylene-vinyl acetate copolymers, acrylate polymers, polar nitrogen-containing compounds, alpha-olefin copolymers, maleic anhydride polymers and the like. The pour point depressant has an unobvious pour point depression effect, and the problem of poor effect of diesel at low temperature can be effectively solved by compounding the pour point depressant with a surfactant, so that the development space of the diesel pour point depressant is further expanded.

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 the drawback that the terpolymer adds to the cost of the polymerized monomer and to the overall cost as a diesel pour point depressant.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a diesel pour point depressant containing a nonionic surfactant, and preparation and application thereof.

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 containing a nonionic surfactant, which comprises the following components in percentage by weight: 40-80% of nonionic surfactant and 20-60% of tetradecyl methacrylate-N-vinyl pyrrolidone copolymer.

Further, the nonionic surfactant is triethanolamine oleate soap and/or span 80, and when the triethanolamine oleate soap and the span 80 are added simultaneously, the mass ratio is (1-3): (1-3).

Further, the tetradecyl methacrylate-N-vinyl pyrrolidone copolymer is prepared by the following method:

Mixing the tetradecyl methacrylate and the N-vinyl pyrrolidone, adding the mixture and benzoyl peroxide into toluene, and heating to react to obtain the tetradecyl methacrylate-N-vinyl pyrrolidone copolymer.

furthermore, the mol ratio of the tetradecyl methacrylate to the N-vinyl pyrrolidone is (10-15): 1.

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

Furthermore, the mass ratio of the toluene to the mixture of the tetradecyl methacrylate and the N-vinyl pyrrolidone is 1 (3-5).

further, the heating reaction conditions are as follows: reacting for 8-10h at 110-130 ℃.

The second technical scheme of the invention is to provide a preparation method of the diesel oil pour point depressant containing the nonionic surfactant, which is characterized in that the nonionic surfactant and the tetradecyl methacrylate-N-vinyl pyrrolidone copolymer are uniformly mixed to obtain the diesel oil pour point depressant containing the nonionic surfactant.

the third technical scheme of the invention is to provide application of the diesel oil pour point depressant containing the nonionic surfactant, which is characterized in that the diesel oil pour point depressant containing the nonionic surfactant is added into diesel oil, wherein the mass percentage of the diesel oil pour point depressant containing the nonionic surfactant in the diesel oil is 0.1-0.2%.

Further, after adding the diesel oil pour point depressant containing the nonionic surfactant into the diesel oil, performing ultrasonic dispersion for 25-35min at 35-45 ℃.

In the invention, the long alkyl chain of the tetradecyl methacrylate-N-vinyl pyrrolidone copolymer can increase the oil solubility of the polymer in diesel oil and generate eutectic effect with wax crystals. The polar pyrrolidone group contained in the diesel oil can increase the solubility and the dispersibility in the diesel oil, change the crystal habit and further reduce the low-temperature fluidity of the diesel oil.

In the invention, the nonionic surfactant selects triethanolamine oleate soap and span 80, wherein the triethanolamine oleate soap is a nonionic surfactant formed by amidating oleic acid and triethanolamine, has a nitrogen-containing strong polar group, and an N atom structure can enable wax crystals to mutually repel and further hinder the aggregation of the wax crystals; the span 80 and other span surfactants have better wax crystal dispersing effect. Compared with other nonionic surfactants added into diesel oil, the triethanolamine oleate soap and the span 80 have more stable dispersion, and the low-temperature flow property of the diesel oil can be further improved by adding a small amount of the triethanolamine oleate soap and the span 80.

In the invention, when the tetradecyl methacrylate-N-vinyl pyrrolidone copolymer is compounded with the nonionic surfactant, the nonionic surfactant is used as an auxiliary agent to well enlarge the range of the main agent pour point depressant. Compared with the prior art, the diesel oil pour point depressant containing the nonionic surfactant contains the nonionic surfactant, and the diesel oil pour point depressant containing the nonionic surfactant is added into diesel oil, so that the condensation point of the diesel oil can be reduced by 12-17 ℃ and the cold filter plugging point can be reduced by 6-11 ℃ through tests, and the low-temperature flow property of the diesel oil is further improved.

Drawings

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

FIG. 2 is an IR spectrum of a tetradecyl methacrylate-N-vinylpyrrolidone 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 triethanolamine oleate soap is purchased from Shandong Youso chemical technology Co., Ltd, and the span 80 is purchased from Shanghai Tantake technology Co., Ltd. The rest of the raw materials or processing techniques which are not specifically described are conventional commercial raw materials or conventional techniques in the field.

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 ANSI/ASTM D6371-2005 diesel and heated fuel cooling filter plugging point test method.