CN109114426B - Composition for crude oil pour point depressant, preparation method and application - Google Patents
Composition for crude oil pour point depressant, preparation method and application Download PDFInfo
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- CN109114426B CN109114426B CN201710494970.5A CN201710494970A CN109114426B CN 109114426 B CN109114426 B CN 109114426B CN 201710494970 A CN201710494970 A CN 201710494970A CN 109114426 B CN109114426 B CN 109114426B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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- F17D1/00—Pipe-line systems
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- F17D1/17—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity by mixing with another liquid, i.e. diluting
Abstract
The invention discloses a composition for a crude oil pour point depressant, a preparation method and application, wherein the composition for the crude oil pour point depressant comprises the following components in parts by weight: 40-60 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 40g/10 min; 10-20 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 150g/10 min; 10-15 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 400g/10 min; 5-10 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 42% and the melt index of 60g/10 min; 2-5 parts of octadecyl anthracene oil; and 2-3 parts of behenyl anthracene oil sulfonate. The composition has good pour point depressing effect on crude oil with two or more wax precipitation temperature peaks, particularly on crude oil containing microcrystalline wax.
Description
Technical Field
The invention relates to the technical field of pour point depressing of crude oil, in particular to a composition for a pour point depressant of crude oil, the pour point depressant of crude oil, a preparation method and application.
Background
The wax content of most of crude oil in China is 15-37%, even can reach more than 40%, and the crude oil belongs to high wax content crude oil. Highly waxy crude oils generally have a higher freezing point, and as the temperature of the crude oil is lowered, the wax therein will crystallize out, which will eventually cause the crude oil to solidify and lose fluidity, thereby causing difficulties in the recovery and transportation of the crude oil. Therefore, the method has important significance for reducing the freezing point of the crude oil and improving the flow property of the crude oil. The addition of pour point depressants to crude oils is an effective method of lowering the freezing point of crude oils. The principle of the pour point depressant for reducing the solidification point of the crude oil is that the crystallization behavior of wax in the crude oil is changed through the action forms of crystal nucleus, eutectic crystal, adsorption and the like, the formation of wax crystal is effectively inhibited, the structural strength of the crystallized wax is reduced, the formation of wax deposition is inhibited, and the solidification point of the crude oil is reduced.
The main components of the existing pour point depressant are ethylene-vinyl acetate copolymer (EVA) with single molecular weight distribution and basically normal distribution and modified substances thereof, high-molecular polymers such as acrylic acid high-carbon alcohol ester, maleic anhydride copolymer, nitrogen-containing polymer and the like.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the existing pour point depressant has good pour point depression effect on crude oil with only one wax precipitation temperature peak, but has poor pour point depression effect on crude oil with two or more wax precipitation temperature peaks, particularly on crude oil containing microcrystalline wax.
Disclosure of Invention
Based on the above, the embodiment of the invention provides a composition for a crude oil pour point depressant, a preparation method and application, so that the freezing point of crude oil with two or more wax precipitation temperature peaks, especially crude oil containing microcrystalline wax, can be effectively reduced.
Specifically, the method comprises the following technical scheme:
in a first aspect, embodiments of the present invention provide a composition for a pour point depressant for crude oil, the composition comprising the following components in parts by weight:
40-60 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 40g/10 min;
10-20 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 150g/10 min;
10-15 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 400g/10 min;
5-10 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 42% and the melt index of 60g/10 min;
2-5 parts of octadecyl anthracene oil;
and 2-3 parts of behenyl anthracene oil sulfonate.
Further, preferably, the composition comprises the following components in parts by weight:
50-55 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 40g/10 min;
15-20 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 150g/10 min;
13-15 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 400g/10 min;
8-10 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 42% and the melt index of 60g/10 min;
4-5 parts of octadecyl anthracene oil;
and 2-3 parts of behenyl anthracene oil sulfonate.
In a second aspect, embodiments of the present invention provide a crude oil pour point depressant including a composition for a crude oil pour point depressant as described above.
Further, the crude oil pour point depressant is in the form of particles, paste or solution.
In a third aspect, embodiments of the present invention provide a preparation method of a pour point depressant for crude oil, the preparation method including the following steps:
the components in the composition for the crude oil pour point depressant are uniformly mixed and then added into an extruder, and the mixture is sequentially subjected to extrusion molding through heating zones of 145-155 ℃, 170-180 ℃, 190-200 ℃, 215-225 ℃ and 255-265 ℃, and is dried and granulated to obtain the crude oil pour point depressant in the form of particles.
Further, the preparation method further comprises the following steps: and mixing the crude oil pour point depressant in the granular form with a preset amount of organic solvent at a preset temperature to obtain the crude oil pour point depressant in the pasty or solution state.
In a fourth aspect, embodiments of the present invention provide the use of a pour point depressant for crude oil as described above to lower the freezing point of crude oil.
Further, the crude oil is a crude oil having two or more wax precipitation temperature peaks.
Further, the crude oil is a crude oil containing microcrystalline wax.
Further, the crude oil pour point depressant is preferably used in the following amount: the mass of the composition for the pour point depressant of the crude oil is 30mg to 50mg per liter of the crude oil.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
the composition for the crude oil pour point depressant provided by the embodiment of the invention comprises ethylene-vinyl acetate copolymer compounds with different molecular weight distributions, and octadecyl anthracene oil and docosyl anthracene oil sulfonate with long-chain alkyl, and through mutual matching and synergistic action among the components, the crystallization behaviors of wax components with different wax precipitation temperature peaks in crude oil are changed, and the wax crystals are effectively inhibited from forming. In addition, the octadecyl anthracene oil and the docosyl anthracene oil sulfonate can play a good dispersing role, and can inhibit the deposition of wax. In combination of the effects of the above aspects, the composition for the crude oil pour point depressant provided by the embodiment of the invention has good pour point depression effect on crude oil with two or more wax precipitation temperature peaks, especially on crude oil containing microcrystalline wax, and can lower the freezing point of the crude oil by more than 12 ℃.
In addition, the composition for the pour point depressant of the crude oil provided by the embodiment of the invention has good solubility, and is favorable for being continuously injected into the crude oil through dosing equipment when being used on site.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a flow chart of a method for preparing a granular pour point depressant for crude oil according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for preparing a pour point depressant for crude oil in the form of a paste or a solution according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings. Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
In a first aspect, embodiments of the present invention provide a composition for a pour point depressant for crude oil, the composition comprising the following components in parts by weight:
40-60 parts of ethylene-vinyl acetate copolymer (EVA 28/40 for short) with the mass content of vinyl acetate of 28% and the melt index of 40g/10 min;
10-20 parts of ethylene-vinyl acetate copolymer (EVA 28/150 for short) with the mass content of vinyl acetate of 28% and the melt index of 150g/10 min;
10-15 parts of ethylene-vinyl acetate copolymer (EVA 28/400 for short) with the mass content of vinyl acetate of 28% and the melt index of 400g/10 min;
5-10 parts of ethylene-vinyl acetate copolymer (EVA 42/60 for short) with the mass content of vinyl acetate of 42% and the melt index of 60g/10 min;
2-5 parts of octadecyl anthracene oil;
and 2-3 parts of behenyl anthracene oil sulfonate.
The pour point depressant of the crude oil is characterized in that the pour point depressant participates in the crystallization process of the wax to influence the crystallization behavior of the wax, so that the formation of wax crystals is inhibited, the structural strength of the crystallized wax is reduced, and the effect of reducing the freezing point of the crude oil is further achieved.
Therefore, in the embodiment of the invention, according to the crystallization behavior characteristics of the whole wax in the crude oil with two or more wax precipitation temperature peaks, the ethylene-vinyl acetate copolymers with different molecular weight distributions are compounded and used in combination with the octadecyl anthracene oil and the docosyl anthracene oil sulfonate with long chain alkyl, and the crystallization behavior of the whole wax in the crude oil with two or more wax precipitation temperature peaks is changed through the mutual coordination and synergistic effect among the components, so that the wax crystal formation is effectively inhibited. Meanwhile, the octadecyl anthracene oil and the docosyl anthracene oil sulfonate can play a good dispersing role, and can inhibit the deposition of wax.
In combination of the effects of the above aspects, the composition for the crude oil pour point depressant provided by the embodiment of the invention has good pour point depression effect on crude oil with two or more wax precipitation temperature peaks, especially on crude oil containing microcrystalline wax, and can lower the freezing point of the crude oil by more than 12 ℃.
In addition, the composition for the pour point depressant of the crude oil provided by the embodiment of the invention has good solubility, and is favorable for being continuously injected into the crude oil through dosing equipment when being used on site.
Further, in the composition for a crude oil pour point depressant provided by the embodiment of the invention, the parts by weight of the EVA28/40 can be specifically 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, 60 parts and the like; the EVA28/150 can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts and the like in parts by weight; the EVA28/400 can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts and the like in parts by weight; the EVA42/60 can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts and the like. The weight parts of the octadecyl anthracene oil can be 2 parts, 3 parts, 4 parts and 5 parts; the weight portion of the behenyl anthracene oil sulfonate can be specifically 2 portions, 2.5 portions, 3 portions and the like.
In a more preferred embodiment of the present invention, the above-mentioned composition for pour point depressant for crude oil comprises the following components in parts by weight: 50-55 parts of EVA 28/40; 15-20 parts of EVA 28/150; 13-15 parts of EVA 28/400; 8-10 parts of EVA 42/60; 4-5 parts of octadecyl anthracene oil; and 2-3 parts of behenyl anthracene oil sulfonate.
In the embodiment of the invention, the behenyl anthracene oil sulfonate can be behenyl anthracene oil sodium sulfonate, also can be behenyl anthracene oil potassium sulfonate, or the compound of the behenyl anthracene oil sodium sulfonate and the behenyl anthracene oil potassium sulfonate.
In a second aspect, embodiments of the present invention provide a crude oil pour point depressant including a composition for a crude oil pour point depressant as described above.
The skilled person can add solvent or common additive in the existing crude oil pour point depressant into the composition for crude oil pour point depressant, and improve the comprehensive performance of the crude oil pour point depressant on the basis of keeping the performance of the composition for crude oil pour point depressant, so that the application range of the crude oil pour point depressant is wider.
In the embodiment of the invention, the form of the crude oil pour point depressant can be particles, paste or solution.
In a third aspect, an embodiment of the present invention provides a preparation method of the above-mentioned pour point depressant for crude oil, specifically including the following steps:
the crude oil pour point depressant composition is prepared by uniformly mixing the components in the crude oil pour point depressant composition, adding the mixture into an extruder, sequentially passing through heating zones of 145-155 ℃, 170-180 ℃, 190-200 ℃, 215-225 ℃ and 255-265 ℃, performing extrusion molding, drying, and granulating to obtain the granular crude oil pour point depressant.
Wherein, a high-speed mixer can be adopted to uniformly mix all the components in the composition for the crude oil pour point depressant, and the mixing time can be 5 to 15 minutes.
The extruder body can adopt a co-rotating twin-screw extruder.
The heating temperature can be 145 deg.C, 146 deg.C, 148 deg.C, 150 deg.C, 152 deg.C, 154 deg.C, 155 deg.C, etc. within the temperature range of 145-155 deg.C.
The heating temperature can be 170 deg.C, 172 deg.C, 174 deg.C, 175 deg.C, 176 deg.C, 178 deg.C, 180 deg.C, etc. within the temperature range of 170-180 deg.C.
The heating temperature can be 190 deg.C, 192 deg.C, 194 deg.C, 195 deg.C, 196 deg.C, 198 deg.C, 200 deg.C, etc. within the temperature range of 190-200 deg.C.
The heating temperature in the range of 215-225 deg.C may be 215 deg.C, 216 deg.C, 218 deg.C, 220 deg.C, 222 deg.C, 224 deg.C, 225 deg.C, etc.
The heating temperature can be 255 ℃, 256 ℃, 258 ℃, 260 ℃, 262 ℃, 264 ℃, 265 ℃ and the like in the temperature range of 255-265 ℃.
As a preferable embodiment of the present invention, the components of the composition for a crude oil pour point depressant are mixed uniformly, and then sequentially passed through heating zones of 150 ℃, 175 ℃, 195 ℃, 220 ℃ and 260 ℃ to be extrusion-molded.
The residence time in each heating zone is not particularly limited in the embodiments of the present invention, and may be set by those skilled in the art according to practical situations.
Further, the preparation method provided by the embodiment of the invention further comprises the following steps: mixing the crude oil pour point depressant in the form of particles with a preset amount of organic solvent at a preset temperature to obtain the crude oil pour point depressant in the form of paste or solution.
It is understood by those skilled in the art that the form of the crude oil pour point depressant is controlled to be a paste or a solution by controlling the amount of the organic solvent.
The organic solvent may be at least one of toluene, xylene or distillate.
The preset temperature can be 45-55 ℃, and preferably 50 ℃.
In a fourth aspect, embodiments of the present invention provide a use of the above-described pour point depressant for crude oil for depressing the freezing point of crude oil.
The crude oil pour point depressant provided by the embodiment of the invention is suitable for crude oil with two or more wax precipitation temperature peaks, and is particularly suitable for crude oil containing microcrystalline wax. Wherein, in the crude oil containing the microcrystalline wax, the content of the microcrystalline wax is less than 5 percent.
In the embodiment of the invention, the dosage of the pour point depressant for crude oil is as follows: the mass of the composition for the pour point depressant for crude oil is 30mg to 50mg, for example, 30mg, 35mg, 40mg, 45mg, 50mg, etc., per liter of crude oil. That is, when the form of the crude oil pour point depressant is particles, the mass of the crude oil pour point depressant is directly weighed according to the preset addition amount and added into the crude oil; when the form of the crude oil pour point depressant is paste or solution, the amount of the crude oil pour point depressant to be added needs to be converted according to the concentration of the composition for the crude oil pour point depressant in the crude oil pour point depressant so as to ensure that the addition amount of the composition for the crude oil pour point depressant meets the requirement.
The technical solution of the present invention is further described by the following specific examples.
In the following examples, the main chemicals involved are as follows:
EVA 28/40: from Akema chemical Co., France, CAS number 24937-78-8;
EVA 28/150: purchased from the korean LG group, CAS No. 24937-78-8;
EVA 28/400: purchased from the korean LG group, CAS No. 24937-78-8;
EVA 42/60: from Akema chemical Co., France, CAS number 24937-78-8;
octadecyl anthracene oil: available from oil and gas technology development, Inc., of Diverer, Beijing under CAS number 90640-80-5;
behenyl anthracene oil sulfonate: purchased from petroleum additives division, di wei er petroleum and gas technology development, beijing.
Example 1
The embodiment provides a granular pour point depressant for crude oil, which is prepared by the following steps:
the crude oil pour point depressant is prepared by adding 520 g of EVA28/40, 170 g of EVA28/150, 140 g of EVA28/400, 90 g of EVA42/60, 40g of octadecyl anthracene oil and 30 g of docosyl anthracene oil sulfonate into a high-speed mixer, fully mixing for 10 minutes, transferring into a co-rotating twin-screw extruder, sequentially passing through heating zones of 150 ℃, 175 ℃, 195 ℃, 220 ℃ and 260 ℃, finally extruding through an extrusion port, drying, and granulating to obtain a granular crude oil pour point depressant, wherein the granular crude oil pour point depressant is marked as pour point depressant 1.
Example 2
The embodiment provides a pasty pour point depressant for crude oil, which is prepared by the following steps:
adding 500 g of EVA28/40, 200 g of EVA28/150, 130 g of EVA28/400, 100 g of EVA42/60, 40g of octadecyl anthracene oil and 30 g of docosyl anthracene oil sulfonate into a high-speed mixer, fully mixing for 10 minutes, transferring into a co-rotating twin-screw extruder, sequentially passing through heating zones at 152 ℃, 173 ℃, 193 ℃, 222 ℃ and 263 ℃, finally extruding and molding through an extrusion port, drying and dicing to obtain a granular crude oil pour point depressant, and mixing the granular crude oil pour point depressant and toluene in a mixing kettle for 30 minutes at 50 ℃ to obtain a pasty crude oil pour point depressant, which is marked as pour point depressant 2.
Example 3
The embodiment provides a pasty pour point depressant for crude oil, which is prepared by the following steps:
550 g of EVA28/40, 150g of EVA28/150, 150g of EVA28/400, 80 g of EVA42/60, 50g of octadecyl anthracene oil and 20 g of docosyl anthracene oil sulfonate are added into a high-speed mixer to be fully mixed for 10 minutes, then the mixture is transferred into a co-rotating twin-screw extruder to pass through heating zones with the temperature of 147 ℃, 169 ℃, 197 ℃, 218 ℃ and 256 ℃ in sequence, finally the mixture is extruded and molded through an extrusion port, dried and granulated to obtain a granular crude oil pour point depressant, and the granular crude oil pour point depressant and xylene are mixed in a mixing kettle for 30 minutes at the temperature of 47 ℃ to obtain a pasty crude oil pour point depressant product, namely pour point depressant 3.
Example 4
This example provides a solution pour point depressant for crude oil, which is prepared by the following steps:
adding 400g of EVA28/40, 200 g of EVA28/150, 100 g of EVA28/400, 100 g of EVA42/60, 20 g of octadecyl anthracene oil and 30 g of docosyl anthracene oil sulfonate into a high-speed mixer, fully mixing for 10 minutes, then transferring into a co-rotating twin-screw extruder, sequentially passing through heating zones of 150 ℃, 175 ℃, 195 ℃, 220 ℃ and 260 ℃, finally extruding and molding through an extrusion opening, drying, granulating to obtain a granular crude oil pour point depressant, and mixing the granular pour point depressant and fraction oil in a mixing kettle for 30 minutes at 52 ℃ to obtain a solution crude oil pour point depressant, which is marked as pour point depressant 4.
Example 5
This example provides a solution pour point depressant for crude oil, which is prepared by the following steps:
the preparation method comprises the steps of adding 600 g of EVA28/40, 100 g of EVA28/150, 150g of EVA28/400, 50g of EVA42/60, 50g of octadecyl anthracene oil and 20 g of docosyl anthracene oil sulfonate into a high-speed mixer, fully mixing for 10 minutes, transferring into a co-rotating twin-screw extruder, sequentially passing through heating zones at 150 ℃, 175 ℃, 195 ℃, 220 ℃ and 260 ℃, finally extruding and molding through an extrusion port, drying, granulating to obtain a granular crude oil pour point depressant, and mixing the granular pour point depressant and fraction oil in a mixing kettle at 53 ℃ for 30 minutes to obtain a solution crude oil pour point depressant, namely pour point depressant 5.
Example 6
The embodiment provides a granular pour point depressant for crude oil, which is prepared by the following steps:
adding 300 g of EVA28/40, 300 g of EVA28/150, 80 g of EVA28/400, 150g of EVA42/60, 10 g of octadecyl anthracene oil and 50g of docosyl anthracene oil sulfonate into a high-speed mixer, fully mixing for 10 minutes, then transferring into a co-rotating twin-screw extruder, sequentially passing through heating zones of 145 ℃, 170 ℃, 190 ℃, 225 ℃ and 265 ℃, finally extruding through an extrusion opening, drying and dicing to obtain the granular crude oil pour point depressant, namely pour point depressant 6.
Example 7
The embodiment provides a pasty pour point depressant for crude oil, which is prepared by the following steps:
700 g of EVA28/40, 60g of EVA28/150, 200 g of EVA28/400, 30 g of EVA42/60, 80 g of octadecyl anthracene oil and 10 g of docosyl anthracene oil sulfonate are added into a high-speed mixer to be fully mixed for 10 minutes, then the mixture is transferred into a co-rotating double-screw extruder to be sequentially passed through heating zones of 155 ℃, 180 ℃, 200 ℃, 215 ℃ and 255 ℃, finally the mixture is extruded and formed through an extrusion port, dried and granulated to obtain a granular crude oil pour point depressant, and the granular pour point depressant and xylene are mixed for 40 minutes in a mixing kettle at 50 ℃ to obtain a pasty crude oil pour point depressant, which is marked as pour point depressant 7.
Comparative example 1
The comparative example prepares the comparative pour point depressant according to the method disclosed in the Chinese patent application with the publication number of CN104214516A, and the specific steps are as follows:
adding 15# diesel oil, pour point depressant LF-04, KD-1 pour point depressant, octadecyl acrylate-maleic acid didodecyl amide comb-type copolymer (POMN) and other four components into an enamel reaction kettle according to the weight ratio; slowly heating to 65-70 ℃, stirring for 60 minutes, then adding EVA modified pour point depressant ZLX-01 in proportion, stirring for 60 minutes, then continuously stirring 200# solvent oil, continuing stirring for 60 minutes, stopping heating while cooling, and cooling to normal temperature to obtain pour point depressant, which is marked as pour point depressant 8.
Comparative example 2
This comparative example provides a conventional pour point depressant prepared as follows:
25 g of an ethylene-vinyl acetate copolymer (vinyl acetate content 34%, molecular weight 3.7 × 10)4) And 40g of diesel oil were put into a 500ml three-necked flask equipped with a stirrer, and stirred at 60 ℃ for 90 minutes, after the ethylene-vinyl acetate copolymer was completely dissolved, the temperature of the reaction system was lowered to 50 ℃, 17 g of ethanol was added, 0.25 g of NaOH was slowly added (approximately 3 hours was required), and saponification was continued at 50 ℃ for 5 hours. The reaction mixture was poured out and the solvent removed in vacuo to give the pour point depressant, designated pour point depressant 9.
Next, the pour point depressant effects of examples 1 to 7 and comparative examples 1 to 2 were evaluated by taking Sudan crude oil as a sample.
Wherein, the oil sample is from certain oil field of Sudan, the original oil sample solidifying point is 45 ℃, the oil sample has a wax peak near 70 ℃ and a wax peak near 55 ℃, which are respectively corresponding to the precipitation peaks of microcrystalline wax and paraffin wax.
The specific measurement process is as follows: 200 g of Sudan crude oil is weighed into a closed container, 50ppm of the pour point depressant in the above examples 1-7 and comparative examples 1-2 (wherein the pasty or solution pour point depressant in examples 2, 3, 4, 5 and 7 is based on the mass of the granular pour point depressant before the solvent is added) is respectively added under the heat treatment condition of 60-70 ℃, and after uniform stirring, the heat treatment is continued for 30 minutes. Then, the temperature is reduced to a final cooling temperature of 25 ℃ at a temperature reduction rate of 0.5 ℃ per minute under stirring, and a sample is taken to test the freezing point of the oil sample, wherein the freezing point test is carried out according to the standard SY/T5887-93 of the oil enterprise, and the results are shown in Table 1.
TABLE 1 evaluation results of pour point depressant pour point depressing effect
As can be seen from the data in Table 1, the pour point depressant provided in the embodiments (examples 1 to 5) of the present invention has a better pour point depression effect on crude oil containing microcrystalline wax and having two wax precipitation temperature peaks, and the pour point depression range can reach more than 10 ℃, particularly the pour point depression range of the pour point depressant provided in examples 1 to 3 can reach more than 12 ℃. As for the pour point depressants provided by the examples 6 and 7, the mass ratio of the components is not in the range defined by the examples of the invention, so that the pour point depressing effect is slightly poorer than that of the pour point depressants of the examples 1-5, but the pour point depressing amplitude can still reach more than 8 ℃, which is better than that of the existing pour point depressants in the comparative examples 1 and 2. The pour point depressant in the prior art in the comparative example 1 and the comparative example 2 has poor pour point depressing effect on crude oil containing microcrystalline wax and having two wax precipitation temperature peaks, and the pour point depressing amplitude is below 8 ℃.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The composition for the pour point depressant of the crude oil is characterized by comprising the following components in parts by weight:
40-60 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 40g/10 min;
10-20 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 150g/10 min;
10-15 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 400g/10 min;
5-10 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 42% and the melt index of 60g/10 min;
2-5 parts of octadecyl anthracene oil;
and 2-3 parts of behenyl anthracene oil sulfonate.
2. The composition for a pour point depressant for crude oil according to claim 1, wherein the composition comprises the following components in parts by weight:
50-55 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 40g/10 min;
15-20 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 150g/10 min;
13-15 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 28% and the melt index of 400g/10 min;
8-10 parts of ethylene-vinyl acetate copolymer with the mass content of vinyl acetate of 42% and the melt index of 60g/10 min;
4-5 parts of octadecyl anthracene oil;
and 2-3 parts of behenyl anthracene oil sulfonate.
3. A pour point depressant for crude oil comprising the composition for a pour point depressant for crude oil of claim 1 or 2.
4. The pour point depressant for crude oil of claim 3, wherein the pour point depressant for crude oil is in the form of a particle, a paste, or a solution.
5. The preparation method of the pour point depressant for crude oil is characterized by comprising the following steps of:
the crude oil pour point depressant composition of claim 1 or 2, wherein the components are uniformly mixed and then added into an extruder, and the mixture is sequentially subjected to extrusion molding through heating zones of 145-155 ℃, 170-180 ℃, 190-200 ℃, 215-225 ℃ and 255-265 ℃, and then is dried and granulated to obtain the granular crude oil pour point depressant.
6. The method of manufacturing according to claim 5, further comprising:
and mixing the crude oil pour point depressant in the granular form with a preset amount of organic solvent at a preset temperature to obtain the crude oil pour point depressant in the pasty or solution state.
7. Use of the pour point depressant according to claim 3 or 4 for depressing the freezing point of crude oil.
8. The use according to claim 7, wherein the crude oil is a crude oil having two or more wax precipitation temperature peaks.
9. Use according to claim 8, characterized in that the crude oil is a crude oil containing microcrystalline wax.
10. The use of claim 7, wherein the crude oil pour point depressant is used in an amount of: the mass of the composition for the pour point depressant of the crude oil is 30mg to 50mg per liter of the crude oil.
Priority Applications (1)
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