CN103421555B - Gasoline composite additive and preparation method and application thereof - Google Patents
Gasoline composite additive and preparation method and application thereof Download PDFInfo
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- CN103421555B CN103421555B CN201310326015.2A CN201310326015A CN103421555B CN 103421555 B CN103421555 B CN 103421555B CN 201310326015 A CN201310326015 A CN 201310326015A CN 103421555 B CN103421555 B CN 103421555B
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Abstract
The invention discloses a gasoline composite additive and a gasoline composition containing the gasoline composite additive. The gasoline composite additive comprises a clearing agent, a carrying agent and a friction modifier, wherein the clearing agent is one of polyisobutene amine, polyisobutene polyamine, polyether amine, or mannich base compounded by the reaction of alkylphenol with R base molecular weight greater than or equal to 800 and mannich of polyamine;the carrying agent is one of polyether, mineral oil and polymerized Alpha olefin or a mixture of polyether and polyisobutene; the friction modifier is vegetable oleic acid ammonium salt. The gasoline composite additive solves the problems that the cooperativity of the friction modifier of the gasoline composite additive is poor, and fuel saving and emission reduction functions are low in the prior art.
Description
Technical field
The invention belongs to energy field, being specifically related to a kind of composite additive for improving gasoline combustion performance and gasoline composition.
Background technology
As everyone knows, containing more unsaturated hydro carbons and sulphur, nitrogen compound in Fuel Petroleum, easily contact with air in storage with use procedure and be oxidized to colloid, directly cause in process combustion, carbon distribution and settling is easily generated in carburettor, EFI mouth, intake valve and combustion chamber, thus cause fuel feeding not smooth, air-fuel ratio is lacked of proper care, incomplete combustion, waste fuel, reduce the problems such as motor efficiency, and discharge a large amount of obnoxious flavoures, also increase the friction and wear between moving parts simultaneously.Especially in recent years, along with automotive industry fast development, the usage quantity of automobile also sharply increases, and also directly causes energy supply and demand nervous thus, cause fuel price constantly objectionable impurities that is soaring and motor vehicle exhaust increase, cause the more serious of the problem of air environmental pollution.
For solving the problems that above-mentioned gasoline exists in combustion, usual use two kinds of methods promote gasoline quality: be carry out the operations such as refining hydrogenation or solvent extraction to gasoline further on the one hand, the content being reduced the objectionable constituent such as sulphur, nitrogen, aromatic hydrocarbons in fuel by the petroleum refining process such as hydrofining improves the effective technological line of fuel oil quality, but require very high to hydrogenation catalyst and reaction process, tooling cost is higher; Be then add one or more multi-effect composite additives in existing Fuel Petroleum on the other hand, utilize the performance between different additive to play the effect improving gasoline performance.A kind of rear method increases detergency and the oilness of gasoline, and the method that current Fuel Petroleum adds composite additive mostly solves the problems referred to above.
In prior art, can be used for adding in the composite additive in gasoline and generally comprise purification agent, friction improver, carry the additive component such as agent, lubricant, add mode can single or part mix interpolation, this depend on for improve gasoline performance and additive between mating reaction.
Usually, the constituent species playing function not of the same race in the composite additive added in prior art is more, this just brings a problem, its interoperability issues i.e., such as compound rises in adding and reduces friction, the content that the friction improver improving fuel efficiency is dissolved in gasoline is lower, because its content is in the oil lower, make the reduction friction of friction improver, the effect improving fuel efficiency reduces, and then have influence on the overall effect reduction that gasoline is improved of whole composite additive, in order to the overall function improved gasoline of function and composite additive improving friction improver, the general addition by increasing friction improver, improve its content in the oil, and then improve its result of use.But, owing to adding the addition of friction improver, considerably increase cost, economy is poor, and its function is not significantly improved yet, and also can bring due to additive ratio raising in the oil simultaneously, and the content of gasoline reduces, have impact on the problem of the dynamic property of automobile.
Summary of the invention
For this reason, technical problem to be solved by this invention is that the composite additive synergetic property for gasoline is poor, and affect the improvement effect of whole composite additive to gasoline, and then provide a kind of synergetic property is strong, oil-saving discharging-reducing function strengthens composite additive and preparation method thereof.
For solving the problems of the technologies described above, gasoline composite additive of the present invention, described composite additive comprises purification agent that ratio of weight and number is 1:0.5-6:0.2-2, carries agent and friction improver:
Described purification agent is polyisobutenyl amine, one in the Mannich base synthesized by Mannich reaction of polyisobutenyl polyamines, polyetheramine or the alkylphenol that is >=800 by R base molecular weight and polyamines;
Describedly carry the mixture that agent is a kind of or polyethers in polyethers, mineral oil, polyalphaolefin and polyisobutene;
Described friction improver is vegetable oil acid amine salt.
Preferably, when described carry agent select the mixture of polyethers and polyisobutene time, the addition of described polyethers is greater than the addition of described polyisobutene, and the addition of described polyisobutene accounts for the whole content carrying agent lower than 40%.
Preferably, described purification agent is described polyisobutenyl amine, described polyisobutenyl polyamines or described Mannich base, described in carry agent be described mineral oil or described poly-a alkene, described purification agent and described weight ratio of carrying agent are 1:3-6.
Preferably, described purification agent is described polyisobutenyl amine, described polyisobutenyl polyamines or described Mannich base, describedly carry the mixture that agent is described polyethers or described polyethers and described polyisobutene, described purification agent and described weight ratio of carrying agent are 1:0.7-1.1.
Preferably, described purification agent is described polyetheramine, described in carry agent be described mineral oil, described polyalphaolefin or described polyethers, described purification agent and described weight ratio of carrying agent are 1:0.5-4.
Preferably, the weight ratio of described purification agent and described friction improver is 1:0.5-1.
Produce because vegetable oil acid is natural fats and oils, comprise various lipid acid, the vegetable oil acid amine salt adopted in friction improver of the present invention is the main lipid acid amine salt containing 16,18,20 and 22 carbon atoms.Described vegetable oil acid amine salt be containing 70% the vegetable oil acid of lipid acid of 18 carbon atoms and the product that reacts of butylamine.
In described friction improver, there is described in the described content containing the lipid acid amine salt of 18 carbon atoms is greater than respectively the content of 16,20 and 22 fat of carbon atom amine acid salts.Described vegetable oil acid amine salt be containing 80% the vegetable oil acid of lipid acid of 18 carbon atoms and the product that reacts of butylamine.
The described lipid acid amine salt with 18 carbon atoms comprises unsaturated fatty acids amine acid salt and saturated fatty amine acid salt, and the content of described unsaturated fatty acids amine acid salt is greater than the content of described saturated fatty amine acid salt.Described vegetable oil acid amine salt be containing 90% the vegetable oil acid of lipid acid of 18 carbon atoms and the product that reacts of butylamine.
Described gasoline composite additive is prepared by the method by being in harmonious proportion, in harmonic process, in order to make the mixing of each component and the more even homogeneous of mediation, those skilled in the art can according to the usual understanding to each constitutive property, suitable solvent is selected to carry out the use of auxiliary mediation, but whether the interpolation of solvent does not in fact affect the improvement of described compositions of additives to gasoline performance, only as the use improving its solubility property.Such as, when described purification agent be described polyisobutenyl amine, described in carry the n-Butyl Amine 99 salt that agent is described mineral oil, described friction improver is vegetable oil acid time can not add solvent be in harmonious proportion, but when replacing described mineral oil with described polyethers, then can assist and add aromatic hydrocarbons or the alkane solvent use as auxiliary mediation.The addition of described solvent can make above-mentioned each components dissolved for benchmark well known to a person skilled in the art.
The preparation method of described gasoline composite additive comprise according to selected weight part ratio get described purification agent, described in carry agent and described friction improver, carry out the step be in harmonious proportion in room temperature to 60 DEG C.And comprise the step selecting suitable solvent to assist mediation further.
Described gasoline composite additive is applied to the field of improving gasoline performance.
Present invention also offers a kind of gasoline composition comprising above-mentioned gasoline composite additive, described gasoline composite additive is calculated as 10-1500ppm based on the addition of gasoline with the amount of described purification agent.If containing the auxiliary solvent that is in harmonious proportion in described compositions of additives, then only with the total of not solvent-laden additive, lower same.
Preferably, described gasoline composite additive calculates 50-1000ppm based on the addition of gasoline with the gauge of described purification agent.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) gasoline composite additive of the present invention, comprising purification agent is one in polyisobutenyl amine, polyisobutenyl polyamines, Mannich base, polyetheramine, carrying agent is a kind of or polyethers in polyethers, mineral oil, polyalphaolefin and the mixture in polyisobutene, and friction improver is the amine salt of vegetable oil acid.Have selected above-mentioned additive due to gasoline composite additive of the present invention and be in harmonious proportion together according to certain ratio, the synergetic property of gasoline composite additive is significantly improved, its fuel-economizing, reduction of discharging function are fully played, compared with adding the gasoline after composite additive of the present invention and not adding the gasoline of any additive, or compared with adding the gasoline of composite additive in prior art, add the quantity discharged of the CO of the gasoline after composite additive of the present invention, the quantity discharged of HC compound and oil consumption and all significantly reduce.Composite additive of the present invention improves the quality of gasoline significantly, improves its efficiency of combustion, reduces oil consumption, reduces the discharge of the obnoxious flavoures such as CO simultaneously;
(2) gasoline composite additive of the present invention, is chosen as polyisobutenyl amine, polyisobutenyl polyamines or Mannich base by purification agent, described in carry agent and select mineral oil or polyalphaolefin, purification agent is 1:3-6 with the weight ratio scope of carrying agent.The gasoline composite additive chosen in mentioned kind, ratio is more excellent for the effect of the improvement of gasoline quality, and the quantity discharged of the CO of gasoline, the quantity discharged of HC compound and oil consumption reduce all greatly;
(3) present invention also offers a kind of method preparing gasoline composite additive, by being in harmonious proportion gasoline composite additive under the condition of room temperature to 60 DEG C, purification agent, carry together with can well being in harmonious proportion of agent and friction improver, improve purification agent, carry synergetic property between agent and friction improver, and then improve the ability that it improves gasoline performance;
(4) the invention provides a kind of novel gasoline composite additive, may be used for the application in the field of improving gasoline performance, solve the problem being applied to the additive synergetic property difference improving gasoline performances areas in the prior art, and composite additive of the present invention additionally provides the technical scheme that plurality of optional is selected, people can according to the different composite additives needing selection suitable;
(5) present invention also offers a kind of gasoline composition, gasoline composite additive is 10-1500ppm based on the addition of gasoline.According to aforementioned proportion, gasoline composite additive of the present invention is formed gasoline composition together with gasoline blending, the performance of the gasoline in this gasoline composition is not only significantly improved, also optimize the ratio of gasoline composite additive and gasoline, make gasoline ensure that certain dynamic property.
Embodiment
Purification agent used in the following example, carry agent and friction improver is commercially available prod, the above-claimed cpd of different manufacturers, different model all can realize object of the present invention, effect no significant difference, following each embodiment of the present invention only with the compound of following model and manufacturer for representative, carry out the elaboration of technique effect, be not limited to the compound of following cited model and manufacturer.
Described state purification agent model and manufacturer as follows:
The model of described polyisobutenyl amine is
pIBA, available from BASF;
Described polyisobutenyl polyamines is called for short " PIB-EDA ", and chemical name is polyisobutene quadrol (N-polyisobutenyl-1,2-diamino ethamine), and model is OGA-472, purchased from Ao Lunnai company.
The model of described polyetheramine is OGA480, purchased from Ao Lunnai company;
Described Mannich base model is
6410, purchased from Ya Fudun company.
Described carry agent model and manufacturer as follows:
Described polyethers is alkyl alcohol poly(propylene oxide), and model is SAP949, purchased from Shell Co. Ltd;
Described mineral oil model is 600SN, purchased from refinery;
Described polyalphaolefin model is PAO10, purchased from Wuxi City Zhi Yuan Chemical Company;
Described polyisobutene model is Glissopal PIB(Mn=1000), available from BASF;
The vegetable oil acid amine salt of above-mentioned friction improver is the product of vegetable oil acid and n-Butyl Amine 99 reaction product, presses 1:1 molar ratio reaction product by Infineum R650 vegetable oil acid and n-Butyl Amine 99, and produced by hero Hui Neng company, the trade mark is B-1.
Embodiment 1
The composition of the gasoline composite additive described in the present embodiment, comprises purification agent that weight ratio is 1:6:0.2, carries agent and friction improver, wherein:
Described purification agent is polyisobutenyl polyamines 100g;
It is described that to carry agent be mineral oil 600g;
Described friction improver is vegetable oil acid amine salt 20g.
By above-mentioned purification agent, carry the blending at room temperature to 60 DEG C of agent and friction improver and form described gasoline composite additive.
Embodiment 2
The composition of the gasoline composite additive described in the present embodiment, comprises purification agent that weight ratio is 1:3:1, carries agent and friction improver, wherein:
Described purification agent is Mannich base 100g;
It is described that to carry agent be mineral oil 300g;
Described friction improver is the amine salt 100g in vegetable oil acid.
By above-mentioned purification agent, carry the blending at room temperature to 60 DEG C of agent and friction improver and form described gasoline composite additive.
Embodiment 3
The composition of the gasoline composite additive described in the present embodiment, comprises purification agent that weight ratio is 1:4:1, carries agent and friction improver, wherein:
Described purification agent is polyisobutenyl amine 100g;
It is described that to carry agent be polyalphaolefin 400g;
Described friction improver is vegetable oil acid amine salt 100g.
By above-mentioned purification agent, carry agent and friction improver mixing, and add the Solvesso S150 aromatic solvent that appropriate Exxon Mobil Corporation produces and be in harmonious proportion, at room temperature to 60 DEG C, blending forms described gasoline composite additive.
Embodiment 4
The composition of the gasoline composite additive described in the present embodiment, comprises purification agent that weight ratio is 1:1.1:1, carries agent and friction improver, wherein:
Described purification agent is Mannich base 100g;
Described to carry agent be polyethers 70g, polyisobutene 40g;
Described friction improver is vegetable oil acid amine salt 100g.
By above-mentioned purification agent, carry agent and friction improver mixing, and the Exxsol D60 alkane solvent that the Exxon Mobil Corporation adding q.s produces carries out being in harmonious proportion blending at room temperature to 60 DEG C forms described gasoline composite additive.
Embodiment 5
The composition of the gasoline composite additive described in the present embodiment, comprises purification agent that weight ratio is 1:0.7:0.5, carries agent and friction improver, wherein:
Described purification agent is polyisobutenyl amine 100g;
Described to carry agent be polyethers 50g, polyisobutene 20g;
Described friction improver is vegetable oil acid amine salt 50g.
By above-mentioned purification agent, carry agent and friction improver, and add the mixing of appropriate alkane solvent to increase solute effect, and at room temperature to 60 DEG C the described gasoline composite additive of blending formation.
Embodiment 6
The composition of the gasoline composite additive described in the present embodiment, comprises purification agent that weight ratio is 1:0.9:0.8, carries agent and friction improver, wherein:
Described purification agent is polyisobutenyl polyamines 100g;
It is described that to carry agent be polyethers 90g;
Described friction improver is vegetable oil acid amine salt 80g.
By above-mentioned purification agent, carry agent and friction improver, and add the mixing of appropriate alkane solvent to increase solute effect, and at room temperature to 60 DEG C the described gasoline composite additive of blending formation.
Embodiment 7
The composition of the gasoline composite additive described in the present embodiment, comprises purification agent that weight ratio is 1:4:2, carries agent and friction improver, wherein:
Described purification agent is polyetheramine 100g;
It is described that to carry agent be mineral oil 400g;
Described friction improver is vegetable oil acid amine salt 200g.
By above-mentioned purification agent, carry the blending at room temperature to 60 DEG C of agent and friction improver and form described gasoline composite additive.
Embodiment 8
The composition of the gasoline composite additive described in the present embodiment, comprises purification agent that weight ratio is 1:2:0.5, carries agent and friction improver, wherein:
Described purification agent is polyetheramine 100g;
It is described that to carry agent be polyalphaolefin 200g;
Described friction improver is vegetable oil acid amine salt 50g.
By above-mentioned purification agent, carry the blending at room temperature to 60 DEG C of agent and friction improver and form described gasoline composite additive.
Embodiment 9
The composition of the gasoline composite additive described in the present embodiment, comprises purification agent that weight ratio is 1:0.5:1, carries agent and friction improver, wherein:
Described purification agent is polyetheramine 100g;
It is described that to carry agent be polyethers 50g;
Described friction improver is vegetable oil acid amine salt 100g.
By above-mentioned purification agent, carry the blending at room temperature to 60 DEG C of agent and friction improver and form described gasoline composite additive.
Embodiment 10
Each compositional selecting of the gasoline composite additive described in the present embodiment is identical with embodiment 1, and its difference is only described purification agent, carries the adding proportion of agent and described friction improver is 1:0.2:2.2.
Embodiment 11
Each compositional selecting of the gasoline composite additive described in the present embodiment is identical with embodiment 1, and its difference is only described purification agent, carries the adding proportion of agent and described friction improver is 1:6.5:0.1.
Comparative example 1
Component and the content ratio of compositions of additives described in the present embodiment and compositions of additives described in embodiment 1 are identical, also identical with the blending ratio of gasoline, its difference is only, described purification agent is chosen as polyisobutylene succinamide, model is Hitec4249LS, purchased from Ya Fudun company.
Comparative example 2
Component and the content ratio of compositions of additives described in the present embodiment and compositions of additives described in embodiment 1 are identical, also identical with the blending ratio of gasoline, its difference is only, describedly carry agent and be chosen as PETO, its model is PETO-A, purchased from Liaocheng Rui Jie Chemical Co., Ltd..
Comparative example 3
Component and the content ratio of compositions of additives described in the present embodiment and compositions of additives described in embodiment 1 are identical, also identical with the blending ratio of gasoline, its difference is only, described friction improver is chosen as monoolein, and it is the product that oleic acid and glycerine obtain by 1:1 molar ratio reaction.Wherein, oleic acid is purchased from Yueyang Ch-Cheng Oleochemicals Co., Ltd., and glycerine is purchased from Suichang of Zhejiang Province Hui Kang pharmaceutcal corporation, Ltd.
Comparative example 4
Component and the content ratio of compositions of additives described in the present embodiment and composition in comparative example 3 are identical, also identical with the blending ratio of gasoline, and its difference is only that purification agent is chosen as mono alkenyl succimide, carries agent and be chosen as polybutene.Wherein said mono alkenyl succimide model is T151, and purchased from Lanzhou oil-refining chemical head factory additive factory, described polybutene model is PB950, purchased from Korea S great Lin.
Effect example
The present invention carries out fuel performance test with real road, specifically comprises: select 2 taxis, adds commercially available 93# gasoline and measures its emission behaviour, first travels 200 kilometers, finds that discharge is stable, obtains blank gasoline discharge, fuel consumption data, and record.Compositions of additives described in embodiment 1 is mixed with blank gasoline according to the addition based on gasoline cleaning agent addition being 10ppm, according to the method described above Performance Detection is carried out to mixed gasoline, wherein CO quantity discharged is 4.120, HC quantity discharged is 0.040, and fuel consumption per hundred kilometers is 8.0L.Compositions of additives described in embodiment 7 is mixed with blank gasoline according to the addition based on gasoline cleaning agent addition being 40ppm, according to the method described above Performance Detection is carried out to mixed gasoline, wherein CO quantity discharged is 4.119, HC quantity discharged is 0.041, and fuel consumption per hundred kilometers is 7.9L.Visible, compositions of additives of the present invention only can realize the optimization of gasoline performance with the mixing of the addition of 10ppm, but consider for economic benefit, described elevator composition is advisable with 10-1500ppm based on the addition of diesel oil, and addition the most suitable is based on gasoline 50-1000ppm.
With identical gasoline for benchmark, add corresponding compositions of additives according to the addition that in following table, described in each embodiment, additive is corresponding, travelling 2000 kilometers is respectively benchmark, records discharge and the oil consumption result of each experiment, is recorded in following table.
Each embodiment effect data
Visible by above-described embodiment data, the combination of gasoline composite additive of the present invention efficiently can improve the combustionproperty of gasoline, add the gasoline of composite additive of the present invention compared to blank gasoline, it is 38% relative to the CO quantity discharged maximum of the reduction of blank gasoline and the mean value of Schwellenwert, the maximum of its CO quantity discharged reduced can reach 45%, it is 40% relative to the HC quantity discharged maximum of the reduction of blank gasoline and the mean value of Schwellenwert, its HC quantity discharged maximum reduced can reach 50%, it is 14.5% relative to the oil consumption maximum of the reduction of blank gasoline and the mean value of Schwellenwert, the maximum of its oil consumption reduced can reach 15.6%.Compared to additive of the prior art, as in comparative example 1-4 by as described in purification agent, describedly carry agent, described friction improver or above-mentioned three all replace to the additive in non-invention common in prior art, composite additive of the present invention is still at CO, the equal tools in aspect such as HC quantity discharged and oil consumption are significantly improved, from in above table, comparative example 1-4 is only 10.4% relative to the CO quantity discharged maximum of the reduction of blank gasoline and the mean value of minimum value, , its maximum is also only 17%, it is only 13.1% relative to the HC quantity discharged maximum of the reduction of blank gasoline and the mean value of minimum value, its maximum is also only 16.7%, it is also only 5% relative to the oil consumption maximum of the reduction of blank gasoline and the mean value of minimum value, its maximum is also only 8%.Therefore, the invention provides a kind of gasoline composite additive of optimization, purification agent described in it, described in carry synergetic property between agent and described friction improver high, oil-saving discharging-reducing function is strong.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (10)
1. a gasoline composite additive, is characterized in that, by ratio of weight and number be 1:0.5-6:0.2-2 purification agent, carry agent and friction improver forms:
Described purification agent is the one in polyisobutenyl amine, polyisobutenyl polyamines or polyetheramine;
Describedly carry the mixture that agent is mineral oil or polyethers and polyisobutene;
Described friction improver is vegetable oil acid amine salt.
2. gasoline composite additive according to claim 1, it is characterized in that, described purification agent is described polyisobutenyl amine or described polyisobutenyl polyamines, described in carry agent be described mineral oil, described purification agent and described weight ratio of carrying agent are 1:3-6.
3. gasoline composite additive according to claim 1, it is characterized in that, described purification agent is described polyisobutenyl amine or described polyisobutenyl polyamines, describedly carry the mixture that agent is described polyethers and described polyisobutene, described purification agent and described weight ratio of carrying agent are 1:0.7-1.1.
4. gasoline composite additive according to claim 1, is characterized in that, described purification agent is described polyetheramine, described in carry agent be described mineral oil or described polyethers, described purification agent and described weight ratio of carrying agent are 1:0.5-4.
5., according to the arbitrary described gasoline composite additive of claim 1-4, it is characterized in that, the weight ratio of described purification agent and described friction improver is 1:0.5-1.
6., according to the arbitrary described gasoline composite additive of claim 1-5, it is characterized in that, described friction improver is the product that vegetable oil acid and butylamine react.
7. prepare a method for the arbitrary described gasoline composite additive of claim 1-6, it is characterized in that, comprise according to selected weight part ratio get described purification agent, described in carry agent and described friction improver, carry out the step be in harmonious proportion in room temperature to 60 DEG C.
8. the arbitrary described gasoline composite additive of claim 1-6 is in the application for improving gasoline performances areas.
9. comprise a gasoline composition for the arbitrary described gasoline composite additive of claim 1-6, it is characterized in that, described gasoline composite additive is calculated as 10-1500ppm based on the addition of gasoline with the amount of described purification agent.
10. gasoline composition according to claim 9, is characterized in that, described gasoline composite additive is calculated as 50-1000ppm based on the addition of gasoline with the amount of described purification agent.
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| CN103992827B (en) * | 2014-05-20 | 2016-05-18 | 美孚美斯克（泉州）化工有限公司 | A kind of lubricated antiwear and energy-saving increases the composite additive for gasoline of power |
| CN104140857A (en) * | 2014-08-01 | 2014-11-12 | 天津达威燃油科技有限公司 | Composite, energy-efficient and environment-friendly gasoline clearing agent |
| CN104388135B (en) * | 2014-09-22 | 2015-07-01 | 尹熙哲 | Gasoline additive, preparation method and use method thereof |
| CN107338078A (en) * | 2017-05-31 | 2017-11-10 | 中国石化销售有限公司 | A kind of energy-efficient gasoline products |
| CN109593574A (en) * | 2018-12-20 | 2019-04-09 | 李嘉琪 | A kind of petrol power elevator and preparation method thereof |
| CN111635793A (en) * | 2020-04-27 | 2020-09-08 | 江苏龙蟠科技股份有限公司 | Cleaning type gasoline detergent as well as preparation method and using method thereof |
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