CN111253986A - Low-temperature cosolvent of polyoxymethylene dimethyl ether and diesel oil mixed fuel and preparation method thereof - Google Patents
Low-temperature cosolvent of polyoxymethylene dimethyl ether and diesel oil mixed fuel and preparation method thereof Download PDFInfo
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- 239000002283 diesel fuel Substances 0.000 title claims abstract description 43
- 239000006184 cosolvent Substances 0.000 title claims abstract description 42
- -1 polyoxymethylene dimethyl ether Polymers 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 6
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- BBMCTIGTTCKYKF-UHFFFAOYSA-N 1-heptanol Chemical compound CCCCCCCO BBMCTIGTTCKYKF-UHFFFAOYSA-N 0.000 claims abstract description 56
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 claims abstract description 56
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims abstract description 52
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- 235000019438 castor oil Nutrition 0.000 claims abstract description 28
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims abstract description 28
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 22
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 22
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- 238000000034 method Methods 0.000 claims abstract description 13
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- 239000000203 mixture Substances 0.000 claims description 15
- 238000006116 polymerization reaction Methods 0.000 claims description 10
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 150000001298 alcohols Chemical class 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
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- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 230000003381 solubilizing effect Effects 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 5
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- 230000008901 benefit Effects 0.000 description 3
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- 230000000994 depressogenic effect Effects 0.000 description 2
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- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- WBHHMMIMDMUBKC-XLNAKTSKSA-N ricinelaidic acid Chemical compound CCCCCC[C@@H](O)C\C=C\CCCCCCCC(O)=O WBHHMMIMDMUBKC-XLNAKTSKSA-N 0.000 description 1
- 229960003656 ricinoleic acid Drugs 0.000 description 1
- FEUQNCSVHBHROZ-UHFFFAOYSA-N ricinoleic acid Natural products CCCCCCC(O[Si](C)(C)C)CC=CCCCCCCCC(=O)OC FEUQNCSVHBHROZ-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/02—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/18—Organic compounds containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/18—Organic compounds containing oxygen
- C10L1/1802—Organic compounds containing oxygen natural products, e.g. waxes, extracts, fatty oils
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/18—Organic compounds containing oxygen
- C10L1/182—Organic compounds containing oxygen containing hydroxy groups; Salts thereof
- C10L1/1822—Organic compounds containing oxygen containing hydroxy groups; Salts thereof hydroxy group directly attached to (cyclo)aliphatic carbon atoms
- C10L1/1824—Organic compounds containing oxygen containing hydroxy groups; Salts thereof hydroxy group directly attached to (cyclo)aliphatic carbon atoms mono-hydroxy
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- C10L1/00—Liquid carbonaceous fuels
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- C10L1/14—Organic compounds
- C10L1/18—Organic compounds containing oxygen
- C10L1/192—Macromolecular compounds
- C10L1/195—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C10L1/197—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds derived from monomers containing a carbon-to-carbon unsaturated bond and an acyloxy group of a saturated carboxylic or carbonic acid
- C10L1/1973—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds derived from monomers containing a carbon-to-carbon unsaturated bond and an acyloxy group of a saturated carboxylic or carbonic acid mono-carboxylic
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Abstract
The low-temperature cosolvent of the polyoxymethylene dimethyl ether and diesel oil mixed fuel and the preparation method thereof, the cosolvent comprises the following components by volume: 10-20 parts of castor oil, 5-10 parts of n-amyl alcohol, 10-15 parts of n-hexyl alcohol, 15-25 parts of n-heptyl alcohol, 25-45 parts of n-octyl alcohol and 5-15 parts of ethylene-vinyl acetate copolymer. The preparation method comprises the steps of adding n-pentanol into castor oil at room temperature to form a mixed solution, adding n-hexanol, n-heptanol and n-octanol into the mixed solution during stirring, and uniformly mixing, wherein the ethylene-vinyl acetate copolymer is added in batches and in series during the adding process. The low-temperature cosolvent of the invention can dissolve the mixed fuels in any proportion in low-temperature environments such as severe cold, winter and the like, and can stably coexist for a long time.
Description
Technical Field
The invention belongs to the field of fuels, and relates to a low-temperature cosolvent of a mixed fuel of polymethoxy dimethyl ether and diesel oil and a preparation method thereof.
Background
In the field of commercial vehicles in China, diesel vehicles have absolute advantages due to good power economy, but the emission of NOx and PM is an important source for generating haze, and the emission becomes the focus of social attention. In order to meet the national VI emission regulations about to be implemented in 2020, the structural body, the electronic control fuel injection system, the in-cylinder combustion organization, the tail gas aftertreatment system and the like of the diesel engine need to be significantly upgraded, so that the technical difficulty, the product price and the use cost are greatly increased, and the application of clean alternative fuel can reduce the technical, development and use costs of the engine to the maximum extent, thereby realizing energy conservation and emission reduction.
Polyoxymethylene dimethyl ethers (PODE) which is a clean coal-based fuel is an ideal diesel substitute fuel which has been developed in recent years and has a molecular structure general formula of CH3O(CH2O)nCH3And n represents the degree of polymerization and is generally between 3 and 8. The polymethoxy dimethyl ether is liquid at normal temperature, has the characteristics of high oxygen content and high cetane number, can obviously reduce the emission of particles and NOx in a cylinder in the combustion process when being mixed with diesel oil for use, and improves the thermal efficiency. In the prior art, as the lanzhou chemical and physical research institute of the Chinese academy of sciences firstly discloses the catalytic synthesis of polymethoxy dimethyl ether by using ionic liquid, the solid fluidized bed generation method of the joint attack of Qinghua university and Shandong Yuhuang chemical Co., Ltd has already completed the industrial production project of the polymethoxy dimethyl ether of ten thousand tons, and thus, the polymethoxy dimethyl ether has great large-scale marketization application potential.
Although the polymethoxy dimethyl ether and the diesel oil are mutually soluble at normal temperature, the mutual solubility of the polymethoxy dimethyl ether and the diesel oil is limited when the ambient temperature is lower, and when the polymethoxy dimethyl ether is mixed into the diesel oil in a large proportion, two-phase heterogeneous fuel is easily formed in a layering manner; the high polymerization degree component in the polymethoxy dimethyl ether is easy to crystallize and separate out under the low temperature condition due to the high melting point (when the polymerization degree is more than 4, the melting point is higher than-7 ℃), and the filterability of the fuel is influenced. At present, in related fields, people of Shanghai university of traffic, Xiaochun and the like find that when the ambient temperature is reduced to zero degree, the mixed fuel containing more than 10% of the polyoxymethylene dimethyl ethers generates an obvious layering phenomenon; the butanol is used as a cosolvent, so that the low-temperature intersolubility of the butanol and the butanol can be improved to a certain extent, and the higher the concentration is, the better the cosolvent effect is. However, when the ambient temperature is lower than zero or the content of polymethoxy dimethyl ether exceeds 20%, the solubilizing effect of butanol is seriously reduced, and a high addition ratio is required to ensure that the mixed fuel is stable and not layered. At present, no mature technology is available for effectively solving the problem that the mixed fuel of polyoxymethylene dimethyl ethers and diesel oil is difficult to dissolve in each other under the low-temperature conditions of severe cold, winter and the like. In the low-temperature environment such as severe cold, winter, etc., in order to ensure the stability and reliability of the application of the mixed clean fuel of polyoxymethylene dimethyl ether and diesel oil to the engine, the uneven oil supply of the diesel engine is prevented. There is a great need to research a low-temperature cosolvent suitable for the mixed clean fuel of polyoxymethylene dimethyl ethers and diesel oil, and then a higher solubilizing effect is achieved under the condition of a lower adding proportion.
Disclosure of Invention
The invention aims to solve the problem that the polymethoxy dimethyl ether and diesel oil mixed fuel in the prior art are difficult to dissolve mutually in a low-temperature environment, and provides a low-temperature cosolvent of the polymethoxy dimethyl ether and diesel oil mixed fuel and a preparation method thereof, so that the polymethoxy dimethyl ether and the diesel oil mixed fuel can be dissolved in any proportion mutually in the low-temperature environment and can stably coexist for a long time.
In order to achieve the purpose, the invention has the following technical scheme:
a low-temperature cosolvent of a polyoxymethylene dimethyl ether and diesel oil mixed fuel comprises the following components in parts by volume: 10-20 parts of castor oil, 5-10 parts of n-amyl alcohol, 10-15 parts of n-hexyl alcohol, 15-25 parts of n-heptyl alcohol, 25-45 parts of n-octyl alcohol and 5-15 parts of ethylene-vinyl acetate copolymer.
Preferably, in an embodiment of the low-temperature cosolvent of the polyoxymethylene dimethyl ethers and diesel oil mixed fuel, the n-pentanol, the n-hexanol, the n-heptanol and the n-octanol adopt straight-chain monohydric saturated alcohols, and the carbon chain length is between 4 and 8.
Preferably, in an embodiment of the low-temperature co-solvent of the polyoxymethylene dimethyl ethers and diesel fuel blends of the present invention, the purity of n-pentanol, n-hexanol, n-heptanol and n-octanol is greater than 98%.
Preferably, in one embodiment of the low-temperature cosolvent of the mixed fuel of polyoxymethylene dimethyl ethers and diesel oil of the invention, the polyoxymethylene dimethyl ethers is a mixture with a structural formula of CH3O(CH2O)nCH3And n is a polymerization degree value.
Preferably, in one embodiment of the low-temperature cosolvent of the polyoxymethylene dimethyl ethers and diesel mixed fuel, the castor oil is 20 parts, the n-amyl alcohol is 5 parts, the n-hexyl alcohol is 8 parts, the n-heptanol is 17 parts, the n-octanol is 45 parts, and the ethylene-vinyl acetate copolymer is 5 parts by volume.
Preferably, in one embodiment of the low-temperature cosolvent of the polyoxymethylene dimethyl ethers and diesel mixed fuel, the castor oil is 10 parts, the n-amyl alcohol is 5 parts, the n-hexyl alcohol is 10 parts, the n-heptanol is 25 parts, the n-octanol is 35 parts, and the ethylene-vinyl acetate copolymer is 15 parts by volume.
Preferably, in one embodiment of the low-temperature cosolvent of the polyoxymethylene dimethyl ethers and diesel oil mixed fuel, the parts by volume of the castor oil are 15 parts, the part by volume of the n-amyl alcohol is 5 parts, the part by volume of the n-hexyl alcohol is 10 parts, the part by volume of the n-heptyl alcohol is 20 parts, the part by volume of the n-octyl alcohol is 40 parts, and the part by volume of the ethylene-vinyl acetate copolymer is 10 parts.
The invention also discloses a method for preparing the low-temperature cosolvent of the polyoxymethylene dimethyl ethers and diesel oil mixed fuel, which comprises the following steps: taking the components according to the corresponding volume parts, adding n-pentanol into castor oil at room temperature to form a mixed solution, then adding n-hexanol, n-heptanol and n-octanol into the mixed solution in the stirring process, and uniformly mixing, wherein the ethylene-vinyl acetate copolymer is added in batches and successively in the adding process.
Preferably, the n-hexanol, the n-heptanol and the n-octanol are sequentially added into the mixed solution during stirring.
Compared with the prior art, the invention has the following beneficial effects:
1. the dissolving assisting effect is high; the low-temperature cosolvent disclosed by the invention is a compound mixture formula which is screened out through strict analysis and aiming at the physicochemical properties of polymethoxy dimethyl ether and diesel oil, the polarity difference of the polymethoxy dimethyl ether and the diesel oil is alleviated in a stepped manner through the synergistic effect of the components, the pertinence is strong, and the solubilizing effect is greatly improved compared with that of a common cosolvent with a single component;
2. the addition proportion is flexible; the main components of the cosolvent of the invention are fatty alcohol and castor oil, the fatty alcohol and the castor oil have low cost and physical properties close to those of diesel oil, and the cosolvent can also be used as fuel blended with the diesel oil. And because the fatty alcohol and the castor oil are oxygenated fuels, the purpose of reducing the emission of particulate matters can be achieved when the castor oil is applied to the combustion of a diesel engine. Therefore, the low-temperature cosolvent of the mixed fuel of the polymethoxy dimethyl ether and the diesel oil provided by the invention can flexibly adjust the addition proportion, not only can ensure the solubilizing effect, but also cannot influence the excellent emission reduction characteristic of the mixed fuel of the polymethoxy dimethyl ether and the diesel oil due to excessive addition.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a critical miscible temperature curve diagram of polyoxymethylene dimethyl ethers and diesel fuel blends.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention.
Based on the embodiments of the present invention, those skilled in the art can make several simple modifications and decorations without creative efforts, and all other embodiments obtained belong to the protection scope of the present invention.
Reference in the present specification to "an example" means that a particular feature, structure, or characteristic described in connection with the example may be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by the person skilled in the art that the described embodiments of the invention can also be combined with other embodiments.
The invention relates to a low-temperature cosolvent applicable to a mixed fuel of polymethoxy dimethyl ether and diesel, which comprises the following components in parts by volume:
10-20 parts of castor oil, 5-10 parts of n-amyl alcohol, 10-15 parts of n-hexyl alcohol, 15-25 parts of n-heptyl alcohol, 25-45 parts of n-octyl alcohol and 5-15 parts of ethylene-vinyl acetate copolymer.
Wherein, the castor oil is common commercial industrial grade castor oil. The mixed castor oil can greatly improve the intersolubility of the polymethoxy dimethyl ether/diesel mixed fuel, and has better effect when being mixed and added with fatty alcohol. This is probably because ricinoleic acid contains a hydrocarbon group and a hydroxyl group, and the hydrocarbon group and the hydroxyl group further mitigate the difference in polarity between ethers, alcohols, and diesel oil, thereby improving the solubilizing effect.
The n-pentanol, the n-hexanol, the n-heptanol and the n-octanol adopt straight chain monohydric saturated alcohols, and the length of a carbon chain is 4-8. Monohydric alcohol with the same carbon content and straight-chain alcohol have better solubilizing effect on the mixed fuel of polyoxymethylene dimethyl ether and diesel oil than branched-chain alcohol. Low-carbon alcohols such as methanol and ethanol have poor intersolubility with diesel oil, butanol and alcohol with higher carbon content have good dissolution assisting effect on the polyoxymethylene dimethyl ether and diesel oil mixed fuel, and the longer the carbon chain, the better the dissolution assisting effect is. However, the melting point of alcohol with too high carbon content is higher, such as n-nonanol with the melting point of-5 ℃, and the alcohol is not suitable for serving as a cosolvent under low temperature conditions. Meanwhile, monohydric saturated alcohols with different carbon chain lengths are compounded and mixed for use, so that the polarity difference of the mixed fuel can be alleviated in a gradient manner, and the dissolving assisting effect can be improved to a certain extent.
And the purities of the n-pentanol, the n-hexanol, the n-heptanol and the n-octanol are all more than 98%.
Ethylene-vinyl acetate copolymer is added as pour point depressant.
The polymethoxy dimethyl ether may contain a small amount of components with high polymerization degree, and the melting point is higher than-7 ℃ when the polymerization degree is higher than 4, and the use of the pour point depressant can avoid the components from crystallizing and separating out under the low-temperature conditions of high cold, winter and the like.
The polymethoxy dimethyl ether is a mixture, and has a structural formula of CH3O (CH2O) nCH3, wherein n is a polymerization degree value.
The invention can have various flexible adding proportions, and different adding proportions can achieve different effects:
in one embodiment of the invention, the castor oil is 20 parts, the n-pentanol is 5 parts, the n-hexanol is 8 parts, the n-heptanol is 17 parts, the n-octanol is 45 parts, and the ethylene-vinyl acetate copolymer is 5 parts by volume.
Specifically, 10ml of castor oil, 2.5ml of n-pentanol, 4ml of n-hexanol, 8.5ml of n-heptanol, 22.5ml of n-octanol, and 2.5g of ethylene-vinyl acetate copolymer may be taken in correspondence to the above volume parts.
The proportion has the advantages that the proportion of the castor oil and the high-carbon alcohol is higher, and the diesel oil can dissolve the higher proportion of the polyoxymethylene dimethyl ethers under the condition of the same low-temperature cosolvent addition amount, thereby achieving better cosolvent effect.
In another embodiment of the present invention, the castor oil is 10 parts by volume, the n-pentanol is 5 parts by volume, the n-hexanol is 10 parts by volume, the n-heptanol is 25 parts by volume, the n-octanol is 35 parts by volume, and the ethylene-vinyl acetate copolymer is 15 parts by volume.
Specifically, 5ml of castor oil, 2.5ml of n-pentanol, 5ml of n-hexanol, 12.5ml of n-heptanol, 17.5ml of n-octanol, and 7.5g of ethylene-vinyl acetate copolymer may be taken in terms of specific units corresponding to the above volume parts.
The advantage of the mixture ratio is that the ethylene-vinyl acetate copolymer has higher proportion, can achieve better pour point depression effect, and is suitable for the polymethoxy dimethyl ether fuel containing more high-polymerization degree components.
In another embodiment of the present invention, the castor oil is 15 parts by volume, the n-pentanol is 5 parts by volume, the n-hexanol is 10 parts by volume, the n-heptanol is 20 parts by volume, the n-octanol is 40 parts by volume, and the ethylene-vinyl acetate copolymer is 10 parts by volume.
Specifically, according to the specific units corresponding to the above volume parts, 7.5ml of castor oil, 2.5ml of n-pentanol, 5ml of n-hexanol, 10ml of n-heptanol, 20ml of n-octanol, and 5g of ethylene-vinyl acetate copolymer may be taken.
The proportion is more balanced, and the application range is wider.
In order to illustrate the solubilizing effect of the low-temperature cosolvent of the present invention on the mixed fuel of polyoxymethylene dimethyl ether and diesel, the cosolvent formed at the first mixture ratio is used as an example, and a mutual solubility test is particularly performed, as shown in fig. 1.
The upper curve in the figure is the critical miscible temperature curve for the mixed fuel of polyoxymethylene dimethyl ether and diesel, and the lower curve is the critical miscible temperature curve after addition of 3% of the above-mentioned preferred low temperature co-solvent. The diesel oil used in the experiment is commercial-10 # diesel oil, and the polyoxymethylene dimethyl ethers comprise the following components in proportion: PODE2 PODE3 PODE4 2.553%: 88.9%: 8.48% (the number indicates the degree of polymerization, e.g. PODE2 indicates CH3O(CH2O)2CH3). After only 3% of low-temperature cosolvent is added into the mixed fuel of polyoxymethylene dimethyl ether and diesel, the highest critical miscible temperature of the mixed fuel is reduced by about 11 ℃ to below-5 ℃, and the lowest use temperature range of-10 # diesel is met.
The low-temperature cosolvent applicable to the mixed fuel of polyoxymethylene dimethyl ethers and diesel oil can be prepared by the following method:
taking the components according to the corresponding volume parts, adding n-pentanol into castor oil at room temperature to form a mixed solution, sequentially adding n-hexanol, n-heptanol and n-octanol into the mixed solution in the stirring process, and uniformly mixing, wherein the ethylene-vinyl acetate copolymer is added in batches and successively in the adding process, and the low-temperature cosolvent is obtained after uniform mixing.
The low-temperature cosolvent applicable to the polyoxymethylene dimethyl ether/diesel mixed fuel provided by the invention enables the mixed fuel to be mutually dissolved in any proportion in low-temperature environments such as severe cold, winter and the like, and can stably coexist for a long time.
While the invention has been described above with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention, and those modifications and variations are within the scope of the claims of the invention and their equivalents.
Claims (9)
1. The low-temperature cosolvent of the polyoxymethylene dimethyl ether and diesel oil mixed fuel is characterized by comprising the following components in parts by volume: 10-20 parts of castor oil, 5-10 parts of n-amyl alcohol, 10-15 parts of n-hexyl alcohol, 15-25 parts of n-heptyl alcohol, 25-45 parts of n-octyl alcohol and 5-15 parts of ethylene-vinyl acetate copolymer.
2. The low-temperature cosolvent of the polyoxymethylene dimethyl ether and diesel fuel mixture according to claim 1, wherein: the n-pentanol, the n-hexanol, the n-heptanol and the n-octanol adopt straight chain monohydric saturated alcohols, and the length of a carbon chain is 4-8.
3. The low-temperature cosolvent of the polyoxymethylene dimethyl ether and diesel fuel mixture according to claim 1, wherein: the purities of the n-pentanol, the n-hexanol, the n-heptanol and the n-octanol are all more than 98%.
4. The low-temperature cosolvent of the polyoxymethylene dimethyl ether and diesel fuel mixture according to claim 1, wherein: the polymethoxy dimethyl ether is a mixture and has a structural formula of CH3O(CH2O)nCH3And n is a polymerization degree value.
5. The low-temperature cosolvent of the polyoxymethylene dimethyl ether and diesel fuel mixture according to claim 1, wherein:
according to the parts by volume, 20 parts of castor oil, 5 parts of n-amyl alcohol, 8 parts of n-hexyl alcohol, 17 parts of n-heptyl alcohol, 45 parts of n-octyl alcohol and 5 parts of ethylene-vinyl acetate copolymer are taken.
6. The low-temperature cosolvent of the polyoxymethylene dimethyl ether and diesel fuel mixture according to claim 1, wherein:
according to the volume parts, the castor oil is 10 parts, the n-amyl alcohol is 5 parts, the n-hexyl alcohol is 10 parts, the n-heptyl alcohol is 25 parts, the n-octyl alcohol is 35 parts, and the ethylene-vinyl acetate copolymer is 15 parts.
7. The low-temperature cosolvent of the polyoxymethylene dimethyl ether and diesel fuel mixture according to claim 1, wherein:
according to the volume parts, 15 parts of castor oil, 5 parts of n-amyl alcohol, 10 parts of n-hexyl alcohol, 20 parts of n-heptyl alcohol, 40 parts of n-octyl alcohol and 10 parts of ethylene-vinyl acetate copolymer are taken.
8. A method for preparing the low-temperature cosolvent of the polyoxymethylene dimethyl ethers and diesel fuel mixture according to any one of claims 1 to 7, which comprises the following steps: taking the components according to the corresponding volume parts, adding n-pentanol into castor oil at room temperature to form a mixed solution, then adding n-hexanol, n-heptanol and n-octanol into the mixed solution in the stirring process, and uniformly mixing, wherein the ethylene-vinyl acetate copolymer is added in batches and successively in the adding process.
9. The method of claim 8, wherein: and the n-hexanol, the n-heptanol and the n-octanol are sequentially added into the mixed solution in the stirring process.
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