CN114634594B - Temperature-resistant salt-tolerant high-pour-point depressant and preparation method thereof - Google Patents
Temperature-resistant salt-tolerant high-pour-point depressant and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a polymer for reducing the solidifying point of crude oil used in the process of exploiting and transporting high-solidifying oil, in particular to a temperature-resistant salt-resistant high-solidifying oil pour point depressant and a preparation method thereof. The preparation method comprises the following steps: dissolving 4-alkenyl pyridine in solvent 1, and dissolving alkyl alcohol lactate and N-benzyl-N-alkyl acrylamide in solvent 2; mixing the two solutions to perform polymerization reaction under the action of an initiator, and adding a polymerization inhibitor after the reaction is finished to obtain a polymer solution; and removing the solvent from the polymer solution, and extracting, washing, precipitating, filtering and drying to obtain the high-pour-point depressant. The pour point depressant has the advantages of strong temperature resistance and salt resistance, the mineralization resistance reaches more than 250000mg/L, and the temperature resistance reaches more than 250 ℃; when the addition amount is 100ppm, the freezing point of the crude oil is reduced by more than 12 ℃ compared with the crude oil with the freezing point of 30-50 ℃. Thereby solving the problems of lifting and pipe transportation of the high-temperature high-salt high-freezing oil reservoir.
Description
Technical Field
The invention relates to a polymer for reducing the solidifying point of crude oil used in the process of exploiting and transporting high-solidifying oil, in particular to a temperature-resistant salt-resistant high-solidifying oil pour point depressant and a preparation method thereof.
Background
At present, the exploitation of high-pour-point oil in China is gradually changed from the exploitation technology in the traditional form into the novel exploitation technology of high-pour-point oil. This transformation brings very high working efficiency and working quality to the petroleum exploitation industry in China. The biggest defects of the conventional high-pour-point oil exploitation technology are two, namely, the conventional high-pour-point oil exploitation technology can consume very large energy; secondly, the working efficiency of the traditional high-condensate oil exploitation technology is very low.
Most of the high-condensation crude oil in China has high wax content, high condensation point and poor low-temperature fluidity, brings inconvenience to the transportation, exploitation and processing of the crude oil, and increases the production and transportation cost. For several years, the heating and conveying process is the only choice for crude oil pipeline conveying, is easy to realize, and enables crude oil to be conveyed to a destination smoothly and safely. However, there are a number of disadvantages to the process: the fuel consumption is large; once the pipeline is stopped for some reason, the crude oil cannot be continuously supplemented with heat energy, and the pipeline has the danger of 'condensation pipe'; the investment in intermediate heating stations is greater.
Therefore, the application of the pour point depressant is an effective way of saving energy and reducing consumption. Pour Point Depressant (PPD) is an oil additive, which can greatly change the crystal form of paraffin in oil, the interface state and rheological property of system, reduce the condensation point and viscosity of crude oil and improve the quality and efficiency of crude oil in oil extraction, gathering, transportation, storage and other works when the addition amount is small. Crude oil pour point depressants studied at home and abroad are of various kinds and can be generally divided into three types: alkyl naphthalenes, polyolefins and polyesters. Although pour point depressants have been actively studied in various countries in recent years, they are relatively single in nature and few reports have been made on pour point depressants for crude oils having a congealing point of more than 40 ℃.
Disclosure of Invention
The invention provides a temperature-resistant salt-tolerant high-pour-point depressant and a preparation method thereof, aiming at the problems of unsatisfactory application effect of the pour-point depressant with low temperature fluidity in the field of high wax oil development and pipe transportation, low pour-point depressing rate, poor adaptability, poor salt tolerance and the like. The pour point depressant has the advantages of strong temperature resistance and salt resistance, the mineralization resistance reaches more than 250000mg/L, and the temperature resistance reaches more than 250 ℃; when the addition amount is 100ppm, the freezing point of the crude oil is reduced by more than 12 ℃ compared with the crude oil with the freezing point of 30-50 ℃. Thereby solving the problems of lifting and pipe transportation of the high-temperature high-salt high-freezing oil reservoir.
According to a first aspect of the invention, the invention discloses a preparation method of a temperature-resistant salt-resistant high-pour point depressant for oil, which comprises the following steps:
(1) Dissolving 4-alkenyl pyridine in solvent 1, and dissolving alkyl alcohol lactate and N-benzyl-N-alkyl acrylamide in solvent 2;
(2) Mixing the two solutions to perform polymerization reaction under the action of an initiator, and adding a polymerization inhibitor after the reaction is finished to obtain a polymer solution;
(3) And removing the solvent from the polymer solution, and extracting, washing, precipitating, filtering and drying to obtain the high-pour-point depressant.
The structure of the 4-alkenyl pyridine is shown as a formula (1):
wherein R is 1 Is one of H, methyl and ethyl, preferably methyl.
The alkyl alcohol lactate has a structure shown in a formula (2):
where x=an even number from 12 to 20, preferably x=16.
The structure of the N-benzyl-N-N-alkyl acrylamide is shown as a formula (3):
where y=even number from 6 to 18, preferably y=12.
According to a second aspect of the present invention there is provided a pour point depressant made by the process of the first aspect of the present invention having a structure as shown in formula (4):
wherein m=25 to 1000, preferably 300 to 500;
n=5 to 600, preferably 200 to 300;
p=5 to 600, preferably 300 to 400.
R 1 Is one of H, methyl and ethyl, preferably methyl.
x=an even number of 12 to 20, preferably x=16.
y=even number of 6 to 18, preferably y=12.
According to a third aspect of the present invention there is provided the use of a pour point depressant according to the second aspect of the present invention in a high pour point heavy oil reservoir.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The high-pour-point oil pour point depressant has the advantages of wide raw material sources, simple synthesis process, clean and pollution-free process, and easy product acquisition, transportation and storage;
(2) The high-coagulation oil pour point depressant has the advantages of strong temperature resistance and salt resistance, the mineralization resistance reaches more than 250000mg/L, and the temperature resistance reaches more than 250 ℃;
(3) The high-freezing-point oil pour point depressant has good pour point depressing effect, and when the adding amount is 100ppm, the solidifying point of the high-freezing-point crude oil with the solidifying point between 30 and 50 ℃ can be lowered by more than 12 ℃, thereby solving the problems of lifting and pipe transportation of the high-temperature high-salt high-freezing-point oil reservoir.
Detailed Description
The endpoints of the ranges and any values disclosed in the present invention are not limited to the precise range or value, and the range or value should be understood to include values close to the range or value. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
According to a first aspect of the invention, the invention discloses a preparation method of a temperature-resistant salt-resistant high-pour point depressant for oil, which comprises the following steps:
(1) Dissolving 4-alkenyl pyridine in solvent 1, and dissolving alkyl alcohol lactate and N-benzyl-N-alkyl acrylamide in solvent 2;
(2) Mixing the two solutions to perform polymerization reaction under the action of an initiator, and adding a polymerization inhibitor after the reaction is finished to obtain a polymer solution;
(3) And removing the solvent from the polymer solution, and extracting, washing, precipitating, filtering and drying to obtain the high-pour-point depressant.
The structure of the 4-alkenyl pyridine is shown as a formula (1):
wherein R is 1 Is one of H, methyl and ethyl, preferably methyl.
The alkyl alcohol lactate has a structure shown in a formula (2):
where x=an even number from 12 to 20, preferably x=16.
The structure of the N-benzyl-N-N-alkyl acrylamide is shown as a formula (3):
where y=even number from 6 to 18, preferably y=12.
In the present invention, the molar ratio of the 4-alkenyl pyridine, alkyl alcohol lactate and N-benzyl-N-N-alkyl acrylamide is preferably 1:0.01-1.3:0.01-1.9, more preferably 1:0.5:0.7.
Preferably, the solvent 1 is toluene or xylene, and the amount of the solvent 1 is 15 to 50mol based on 1mol of 4-alkenyl pyridine.
Preferably, the solvent 2 is one of N, N-dimethylformamide or butanone, and the amount of the solvent 2 is 10-30mol based on 1mol of 4-alkenyl pyridine.
Preferably, the initiator is one of benzoyl peroxide or azodiisobutyronitrile, and the initiator is used in an amount of 0.01-0.2mol based on 1mol part of 4-alkenyl pyridine.
Preferably, the polymerization inhibitor is hydroquinone or l, 4-naphthoquinone, and the amount of the polymerization inhibitor is 0.05-0.3mol based on 1mol part of 4-alkenyl pyridine.
In the present invention, preferably, the polymerization reaction is usually carried out in the presence of an inert gas including nitrogen or one of the group zero element gases of the periodic table, which is conventional in the art, more preferably nitrogen.
Preferably, the polymerization conditions may include: the temperature is 80-120 ℃, the stirring speed is 500-600 rpm, the reaction time is 3-8 h, preferably 85-90 ℃, the stirring speed is 500-550 rpm, and the reaction time is 5-7 h.
According to a more specific preferred embodiment, the preparation method of the high-pour-point depressant comprises the following steps:
(1) Firstly, adding 4-alkenyl pyridine and a solvent 1 into a four-neck flask with a constant pressure dropping funnel, and introducing N 2 Protecting, heating to 40-45deg.C and stirring at 200-300rpm for 15-20min; secondly, alkyl alcohol lactate and N-benzyl-N-hexadecylacrylamide are dissolved in a solvent 2, and then poured into the four openingsContinuously stirring in the flask at a stirring speed of 300-350rpm;
(2) Dissolving an initiator into toluene, placing the toluene into a constant pressure dropping funnel of the four-neck flask, controlling the dropping speed to be 2-4 drops/min, then increasing the stirring speed to 500-600 rpm, heating to 80-120 ℃, reacting at constant temperature for 3-8 h, adding a polymerization inhibitor after the reaction is finished, closing a heating device, and stirring for 20-30min to obtain a mixed solution;
(3) And (3) distilling the mixed solution under reduced pressure to remove the solvent 1 and the solvent 2, extracting with absolute ethyl alcohol to obtain a crude product, washing with 10% sodium chloride aqueous solution to be neutral, precipitating, filtering, and finally drying in vacuum to constant weight to obtain the high-pour point depressant.
Wherein the toluene is used in an amount of 10 to 25mol based on 1mol of 4-alkenyl pyridine.
According to a second aspect of the present invention there is provided a pour point depressant made by the process of the first aspect of the present invention having a structure as shown in formula (4):
wherein m=25 to 1000, preferably 300 to 500;
n=5 to 600, preferably 200 to 300;
p=5 to 600, preferably 300 to 400;
R 1 is one of H, methyl and ethyl, preferably methyl;
x=an even number from 12 to 20, preferably x=16;
y=even number of 6 to 18, preferably y=12.
Preferably, the molecular weight of the oil pour point depressant is 80000 to 150000g/mol, more preferably 120000 ～ 130000g/mol.
The mineralization resistance of the pour point depressant reaches more than 250000mg/L, and the temperature resistance reaches more than 250 ℃; when the addition amount is 100ppm, the freezing point of the crude oil is reduced by more than 12 ℃ compared with the crude oil with the freezing point of 30-50 ℃.
According to a third aspect of the present invention there is provided the use of a pour point depressant according to the second aspect of the present invention in a high pour point heavy oil reservoir.
Preferably, the temperature of the high-freezing heavy oil reservoir is lower than 300 ℃ and the mineralization degree is lower than 300000mg/L.
The reaction equation is as follows:
the temperature-resistant salt-tolerant high-pour point depressant adopts the molecular design concept, and 4-alkenyl pyridine monomers with rigid structures in the molecules are similar to structures such as colloid, naphthene and the like in crude oil, so that the molecules are easy to adsorb with the crude oil and mutually encircle, and the oil-friendly property of a system is enhanced; the introduced alkyl alcohol lactate and N-benzyl-N-hexadecylacrylamide have flexible groups, can be intertwined with wax crystals of crude oil in the process of wax crystal precipitation, and damage the formation of a wax crystal wafer-shaped structure, so that a wax crystal aggregate is granular rather than grid-shaped, and the pour point depression is realized; the introduced N-benzyl-N-hexadecyl acrylamide group can be adsorbed with crude oil colloid to break the hydrogen bond action inside the crude oil, so that the low-temperature aggregate of the crude oil is forced to disperse, and the low-temperature flow property of the crude oil is further improved. The monomers used in the invention are all nonionic, so that the tolerance to hypersalinity is improved, and the salt tolerance of the pour point depressant is improved. Meanwhile, the monomer 4-alkenyl pyridine and N-benzyl-N-N-hexadecyl acrylamide both have aromatic rings, so that the temperature resistance of the molecule is greatly enhanced.
The invention will be further illustrated with reference to specific examples.
In the present invention, the devices or apparatus used are all conventional devices or apparatus known in the art, and are commercially available.
In the following examples and comparative examples, each reagent used was a chemically pure reagent from commercial sources, unless otherwise specified.
The performance test of the product is carried out by adopting the following method:
molecular weight measurement method refers to the gel chromatography method for measuring the molecular weight and distribution of the polymer of the water treatment agent GB/T31816-2015.
Determination of the freezing point is described in GB T510-1983 (1991) method for determining the freezing point of petroleum products.
The temperature and salt resistance of the pour point depressant is tested by a Ross-Mile method.
Example 1
(1) 15mol of toluene and 1mol of 4-alkenylpyridine were first added to a four-necked flask equipped with a constant pressure dropping funnel, and N was introduced 2 Protecting, heating to 40 ℃ and stirring at 200rpm for 15min; secondly, dissolving 0.01mol of alkyl alcohol lactate and 0.01mol of N-benzyl-N-hexadecylacrylamide into 10mol of N, N-dimethylformamide, and pouring into the four-neck flask, and continuously stirring at the stirring speed of 300rpm;
(2) Dissolving 0.01mol of initiating agent benzoyl peroxide into 12mol of toluene, placing into a constant pressure dropping funnel of the four-necked flask, controlling the dropping speed to be 2 drops/min, then increasing the stirring speed to 500rpm, heating to 80 ℃, reacting at constant temperature for 3h, adding 0.05mol of polymerization inhibitor hydroquinone after the reaction is finished, closing a heating device, and stirring for 20min to obtain a mixed solution;
(3) Distilling the mixed solution under reduced pressure to remove toluene and N, N-dimethylformamide, extracting with absolute ethanol to obtain crude product, washing with 10% sodium chloride aqueous solution to neutrality, precipitating, vacuum filtering, and vacuum drying to constant weight to obtain high-coagulation oil pour point depressant C 1 。
Through testing, the high-pour-point oil pour point depressant C 1 The yield of (C) is 98.5%, the highest temperature resistance is 262 ℃, and the highest mineralization resistance reaches 255000mg/L.
Example 2
(1) 50mol of toluene and 1mol of 4-alkenylpyridine were first added to a four-necked flask equipped with a constant pressure dropping funnel, and N was introduced 2 Protection, heating to 42 ℃ and stirring at 220rpm for 18min; secondly, dissolving 0.1mol of alkyl alcohol lactate and 0.3mol of N-benzyl-N-hexadecylacrylamide into 12mol of N, N-dimethylformamide, and pouring into the four-neck flask, and continuously stirring at the stirring speed of 320rpm;
(2) Dissolving 0.05mol of initiating agent benzoyl peroxide into 15mol of toluene, placing into a constant pressure dropping funnel of the four-neck flask, controlling the dropping speed to be 2 drops/min, then increasing the stirring speed to 520rpm, heating to 100 ℃, reacting at constant temperature for 4 hours, adding 0.512g of polymerization inhibitor hydroquinone after the reaction is finished, closing a heating device, and stirring for 25 minutes to obtain a mixed solution;
(3) Distilling the mixed solution under reduced pressure to remove toluene and N, N-dimethylformamide, extracting with absolute ethanol to obtain crude product, washing with 10% sodium chloride aqueous solution to neutrality, precipitating, vacuum filtering, and vacuum drying to constant weight to obtain high-coagulation oil pour point depressant C 2 。
Through testing, the high-pour-point oil pour point depressant C 2 The yield of (C) is 98.7%, the highest temperature resistance is 265 ℃, and the highest mineralization resistance reaches 270000mg/L.
Example 3
(1) First, 20mol of toluene and 1mol of 4-alkenylpyridine were charged into a four-necked flask equipped with a constant pressure dropping funnel, and N was introduced 2 Protection, heating to 43 ℃ and stirring at 280rpm for 16min; secondly, dissolving 0.5mol of alkyl alcohol lactate and 0.7mol of N-benzyl-N-hexadecylacrylamide into 25mol of butanone, placing into a constant pressure dropping funnel of the four-neck flask, controlling the dropping speed to be 3 drops/min, then increasing the stirring speed to 550rpm, heating to 110 ℃, reacting at constant temperature for 5h, adding 1.125g of polymerization inhibitor l, 4-naphthoquinone after the reaction is finished, closing a heating device, and stirring for 23min to obtain a mixed solution;
(3) Distilling the mixed solution under reduced pressure to remove toluene and butanone, extracting with absolute ethanol to obtain crude product, washing with 10% sodium chloride aqueous solution to neutrality, precipitating, vacuum filtering, and vacuum drying to constant weight to obtain high-coagulation oil pour point depressant C 3 。
Through testing, the high-pour-point oil pour point depressant C 3 The yield of (2) is 99.5%, the highest temperature resistance is 274 ℃, and the highest mineralization resistance reaches 272000mg/L.
Example 4
(1) 45mol of xylene and 1mol of 4-alkenylpyridine are initially introducedInto a four-necked flask with a constant pressure dropping funnel, N was introduced 2 Protection, heating to 42 ℃ and stirring at 250rpm for 17min; secondly, dissolving 0.7mol of alkyl alcohol lactate and 1.2mol of N-benzyl-N-hexadecylacrylamide into 18mol of N, N-dimethylformamide, and pouring into the four-neck flask, and continuously stirring at the stirring speed of 310rpm;
(2) Dissolving 0.16mol of initiator azodiisobutyronitrile into 20mol of toluene, placing into a constant pressure dropping funnel of the four-necked flask, controlling the dropping speed to be 3 drops/min, then increasing the stirring speed to 580rpm, heating to 90 ℃, reacting at constant temperature for 6 hours, adding 1.983g of polymerization inhibitor hydroquinone after the reaction is finished, closing a heating device, and stirring for 28 minutes to obtain a mixed solution;
(3) Distilling the mixed solution under reduced pressure to remove dimethylbenzene and N, N-dimethylformamide, extracting with absolute ethanol to obtain a crude product, washing with 10% sodium chloride aqueous solution to neutrality, precipitating, filtering, and vacuum drying to constant weight to obtain high-coagulation oil pour point depressant C 4 。
Through testing, the high-pour-point oil pour point depressant C 4 The yield of (C) is 99.0%, the highest temperature resistance is 268 ℃, and the highest mineralization resistance reaches 265000mg/L.
Example 5
(1) Firstly, 35mol of dimethylbenzene and 1mol of 4-alkenyl pyridine are added into a four-necked flask with a constant pressure dropping funnel, and N is introduced 2 Protection, heating to 45 ℃ and stirring at 300rpm for 20min; secondly, 1.3mol of alkyl alcohol lactate and 1.9mol of N-benzyl-N-hexadecylacrylamide are dissolved into 30mol of butanone, and then the mixture is poured into the four-neck flask, and stirring is carried out continuously, wherein the stirring speed is 350rpm;
(2) Dissolving 0.2mol of initiator azodiisobutyronitrile into 25mol of toluene, placing into a constant pressure dropping funnel of the four-necked flask, controlling the dropping speed to be 4 drops/min, then increasing the stirring speed to 600rpm, heating to 120 ℃, reacting at constant temperature for 8 hours, adding 2.606g of polymerization inhibitor l, 4-naphthoquinone after the reaction is finished, closing a heating device, and stirring for 30 minutes to obtain a mixed solution;
(3) Distilling the mixed solution under reduced pressureRemoving xylene and butanone, extracting with absolute ethanol to obtain crude product, washing with 10% sodium chloride aqueous solution to neutrality, precipitating, vacuum filtering, and vacuum drying to constant weight to obtain high-coagulation oil pour point depressant C 5 。
Through testing, the high-pour-point oil pour point depressant C 5 The yield of (2) is 99.2%, the highest temperature resistance is 270 ℃, and the highest mineralization resistance reaches 267000mg/L.
Example 6
To verify the pour point depressing effect of the high pour point depressing agent of the present invention, pour point depressing agent C of the present invention 1 、C 2 、C 3 、C 4 、C 5 The method is applied to two crude oils with different viscosities and solidifying points in victory oil fields:
victory oil field high-coagulation thick oil M 2 The basic parameters of (a) are as follows: the solidifying point is 47 ℃, the viscosity is 5683 mPC.s at 50 ℃ and the density is 978.2kg/m 3 The water content was 56.2%.
High-coagulation thick oil P of victory oil field 5 The basic parameters of (a) are as follows: the solidifying point is 36 ℃, the viscosity is 2785 mPa.s (50 ℃) and the density is 965.1kg/m 3 The water content was 36.7%.
Tables 1 and 2 show pour point depressant C of the present invention 1 、C 2 、C 3 、C 4 、C 5 Pour point depressant F commercially available 1 And F 2 For victory oil field high-viscosity thick oil M 2 And P 5 Is a result of the pour point depressing experiment. Commercially available pour point depressant F 1 And F 2 Are all purchased in Shandong province Zibo City, inc.
TABLE 1 victory oil field high-viscosity oil M 2 Is the result of pour point depressing experiment
TABLE 2 victory oilfield high-viscosity oil P 5 Is the result of pour point depressing experiment
As can be seen from tables 1 and 2, the pour point depressant of the present invention can make the high-viscosity thick oil M at an addition amount of 100ppm 2 Freezing point minimum 13 ℃ (pour point depressant C) lower than (freezing point 47℃) 1 ) Up to 18 ℃ (pour point depressant C) 3 ) The method comprises the steps of carrying out a first treatment on the surface of the Can make high-viscosity oil P 5 Freezing point minimum 13 ℃ (pour point depressant C) lower (freezing point 36 ℃) 5 ) Up to 17 ℃ (pour point depressant C) 3 ). Compared with the commercially available pour point depressant, the high-freezing-point oil pour point depressant has better pour point depressing effect on thick oil with different freezing points, and meanwhile, the high-freezing-point oil pour point depressant has the advantages of simple synthesis method, less consumption (100 ppm), convenient use, temperature resistance reaching more than 250 ℃, mineralization resistance reaching more than 250000mg/L, thereby solving the problems of lifting and pipe transportation of high-salt high-freezing-point oil reservoirs and having remarkable economic benefit.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (16)
1. The preparation method of the temperature-resistant salt-tolerant high-pour point depressant is characterized by comprising the following steps of: dissolving 4-alkenyl pyridine in solvent 1, and dissolving alkyl alcohol lactate and N-benzyl-N-alkyl acrylamide in solvent 2; mixing the two solutions to perform polymerization reaction under the action of an initiator, and adding a polymerization inhibitor after the reaction is finished to obtain a polymer solution; removing the solvent from the polymer solution, and extracting, washing, precipitating, filtering and drying to obtain the high-pour-point depressant;
the structure of the 4-alkenyl pyridine is shown as a formula (1):
wherein R is 1 Is one of H, methyl and ethyl;
the structure of the N-benzyl-N-N-alkyl acrylamide is shown as a formula (2):
wherein x=an even number from 12 to 20;
the alkyl alcohol lactate has a structure shown in a formula (3):
where y=an even number from 6 to 18.
2. The preparation method according to claim 1, wherein the molar ratio of the 4-alkenyl pyridine, the alkyl alcohol lactate and the N-benzyl-N-alkyl acrylamide is 1:0.01-1.3:0.01-1.9.
3. The method according to claim 2, wherein the molar ratio of 4-alkenyl pyridine, alkyl alcohol lactate and N-benzyl-N-alkyl acrylamide is 1:0.5:0.7.
4. The preparation method according to claim 1, wherein the solvent 1 is one of toluene and xylene, and the amount of the solvent 1 is 15 to 50mol based on 1mol of 4-alkenylpyridine.
5. The preparation method according to claim 1, wherein the solvent 2 is one of N, N-dimethylformamide or butanone, and the amount of the solvent 2 is 10 to 30mol based on 1mol of 4-alkenylpyridine.
6. The process according to claim 1, wherein the initiator is one of benzoyl peroxide and azobisisobutyronitrile, and the initiator is used in an amount of 0.01 to 0.2mol based on 1mol of 4-alkenylpyridine.
7. The process according to claim 1, wherein the polymerization inhibitor is one of hydroquinone and l, 4-naphthoquinone, and the amount of the polymerization inhibitor is 0.05 to 0.3mol based on 1mol of 4-alkenylpyridine.
8. The method according to claim 1, wherein the polymerization is carried out in the presence of an inert gas comprising one of nitrogen and a group zero element gas of the periodic table.
9. The method of claim 1, wherein the polymerization conditions include: the temperature is 80-120 ℃, the stirring speed is 500-600 rpm, and the reaction time is 3-8 h.
10. The method of claim 9, wherein the polymerization conditions include: the temperature is 85-90 ℃, the stirring speed is 500-550 rpm, and the reaction time is 5-7 h.
11. The preparation method according to claim 1, characterized in that the preparation method specifically comprises the following steps:
(1) Firstly, adding 4-alkenyl pyridine and a solvent 1 into a four-neck flask with a constant pressure dropping funnel, and introducing N 2 Protecting, heating to 40-45deg.C and stirring at 200-300rpm for 15-20min; secondly, dissolving alkyl alcohol lactate and N-benzyl-N-N-hexadecylacrylamide into a solvent 2, and then pouring the mixture into the four-neck flask, and continuously stirring at a stirring speed of 300-350rpm;
(2) Dissolving an initiator into toluene, placing the toluene into a constant pressure dropping funnel of the four-neck flask, controlling the dropping speed to be 2-4 drops/min, then increasing the stirring speed to 500-600 rpm, heating to 80-120 ℃, reacting at constant temperature for 3-8 h, adding a polymerization inhibitor after the reaction is finished, closing a heating device, and stirring for 20-30min to obtain a mixed solution;
(3) And (3) distilling the mixed solution under reduced pressure to remove the solvent 1 and the solvent 2, extracting with absolute ethyl alcohol to obtain a crude product, washing with 10% sodium chloride aqueous solution to be neutral, precipitating, filtering, and finally drying in vacuum to constant weight to obtain the high-pour point depressant.
12. The pour point depressant according to any one of claims 1 to 11, wherein the pour point depressant has a structure represented by formula (4):
wherein m=25 to 1000;
n＝5～600；
p＝5～600；
R 1 is one of H, methyl and ethyl;
x=an even number from 12 to 20;
y=an even number from 6 to 18.
13. Pour point depressant according to claim 12, characterised by the pour point depressant of formula (4), wherein m = 300-500; n=200 to 300; p=300 to 400; r is R 1 Is methyl; x=16; y=12.
14. The pour point depressant of claim 12, wherein the pour point depressant has a molecular weight of 80000 to 150000g/mol.
15. Use of a pour point depressant according to any one of claims 12 to 14 in a high pour point heavy oil reservoir.
16. The use according to claim 15, wherein the high-congealed heavy oil reservoir has a temperature below 300 ℃ and a mineralization below 300000mg/L.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3103503A (en) * | 1957-04-11 | 1963-09-10 | Crystalline poly | |
| US4650596A (en) * | 1983-05-13 | 1987-03-17 | Henkel Kommanditgesellschaft Auf Aktien | Pour point depressants for paraffin solutions |
| JP2004315611A (en) * | 2003-04-14 | 2004-11-11 | Sanyo Chem Ind Ltd | Pour point depressant |
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2020
- 2020-12-16 CN CN202011481826.6A patent/CN114634594B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3103503A (en) * | 1957-04-11 | 1963-09-10 | Crystalline poly | |
| US4650596A (en) * | 1983-05-13 | 1987-03-17 | Henkel Kommanditgesellschaft Auf Aktien | Pour point depressants for paraffin solutions |
| JP2004315611A (en) * | 2003-04-14 | 2004-11-11 | Sanyo Chem Ind Ltd | Pour point depressant |
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