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Identification of Lubricating Oil Additives Using XGBoost and Ant Colony Optimization Algorithms
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作者 Xia Yanqiu Cui Jinwei +2 位作者 Xie Peiyuan Zou Shaode Feng Xin 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2024年第2期158-167,共10页
To address the problem of identifying multiple types of additives in lubricating oil,a method based on midinfrared spectral band selection using the eXtreme Gradient Boosting(XGBoost)algorithm combined with the ant co... To address the problem of identifying multiple types of additives in lubricating oil,a method based on midinfrared spectral band selection using the eXtreme Gradient Boosting(XGBoost)algorithm combined with the ant colony optimization(ACO)algorithm is proposed.The XGBoost algorithm was used to train and test three additives,T534(alkyl diphenylamine),T308(isooctyl acid thiophospholipid octadecylamine),and T306(trimethylphenol phosphate),separately,in order to screen for the optimal combination of spectral bands for each additive.The ACO algorithm was used to optimize the parameters of the XGBoost algorithm to improve the identification accuracy.During this process,the support vector machine(SVM)and hybrid bat algorithms(HBA)were included as a comparison,generating four models:ACO-XGBoost,ACO-SVM,HBA-XGboost,and HBA-SVM.The results showed that all four models could identify the three additives efficiently,with the ACO-XGBoost model achieving 100%recognition of all three additives.In addition,the generalizability of the ACO-XGBoost model was further demonstrated by predicting a lubricating oil containing the three additives prepared in our laboratory and a collected sample of commercial oil currently in use。 展开更多
关键词 lubricant oil additives fourier transform infrared spectroscopy type identification ACO-XGBoost combinatorial algorithm
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Thermal oxidation of two aviation synthetic lubricant base oils 被引量:3
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作者 费逸伟 郭峰 +2 位作者 姚婷 杨宏伟 程治升 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2015年第4期396-404,共9页
The thermal degradation of two synthetic lubricants base oils, poly-a-olefins (PAO) and di-esters (DE), was investigated under oxidative pyrolysis condition and their properties were characterized in simulated "a... The thermal degradation of two synthetic lubricants base oils, poly-a-olefins (PAO) and di-esters (DE), was investigated under oxidative pyrolysis condition and their properties were characterized in simulated "areo-engine" by comparing the thermal stability and identifying the products of thermal decomposition as a function of exposure temperature. The characterization of the products were performed by means of Fourier transform infrared spectrometry (FTIR), gas chromatography/mass spectrometry (GC/MS) and viscosity experiments. The results show that PAO has the lower thermal stability, being degraded at 200℃ different from 300 ℃ for DE. Several by-products are identified during the thermal degradation of two lubricant base oils. The majority of PAO products consist of alkenes and olefins, while more oxygen-contained organic compounds are detected in DE samples based on GC/MS analysis. The related reaction mechanisms are discussed based on the experimental results. 展开更多
关键词 synthetic aviation lubricant base oils thermal stability oxidative pyrolysis GC/MS analysis viscosity degradation
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Three-dimensional modeling of effect of surface intermetallic phase on surface defects of Al-Fe-Si aluminum foils during twin-roll casting
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作者 朱远志 万强 +2 位作者 李丙亮 周峰 张雅峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第2期477-483,共7页
Scanning electron microscopy and X-ray energy dispersive spectrum analysis show that the clusters of intermetallic AlFeSi particle are distributed on or near the aluminum foil stock surfaces heterogeneously. 3D finite... Scanning electron microscopy and X-ray energy dispersive spectrum analysis show that the clusters of intermetallic AlFeSi particle are distributed on or near the aluminum foil stock surfaces heterogeneously. 3D finite element modeling shows that these clusters of hard particles induce the fracture of the nano-scale lubricant oil film at first and further lead to severe deformation in the nearby aluminum foil substrate along the rolling direction. Consequently, the optical property in this region differs from that in the surroundings, resulting in surface defects. 展开更多
关键词 Al-Fe-Si alloy precipitated phase aluminum foils lubricant oil film twin-roll cast 3D modeling
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A New Experimental Rig of Testing Flow Boiling Heat Transfer of Refrigerantand Lubricant Mixture 被引量:5
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作者 魏文建 丁国良 王凯建 《Journal of Shanghai Jiaotong university(Science)》 EI 2004年第4期62-67,共6页
This paper proposed a new experimental rig of testing flow boiling heat transfer of refrigerant and lubricant oil mixture. The quantity of oil in the test section can be controlled and regulated conveniently and accur... This paper proposed a new experimental rig of testing flow boiling heat transfer of refrigerant and lubricant oil mixture. The quantity of oil in the test section can be controlled and regulated conveniently and accurately by connecting separate lubricant oil circuit with test section in parallel. It was built up by retrofitting a multiple air-conditioner and installing three oil-separators in serials at the compressor outlet. And so the lubricant oil in the discharged refrigerant gas of compressor can be removed completely.The refrigerant flow rate through test section can be bypassed by the by-path circuit of indoor unit.This experimental rig has advantages such as on-line and continuous oil injection, short time of obtaining stability, flexible operation, simple control, which lead to high efficiency in the research of flow boiling heat transfer of refrigerant and lubricant oil mixture. 展开更多
关键词 REFRIGERANT flow boiling heat transfer lubricant oil
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Tribological Properties of Few-layer Graphene Oxide Sheets as Oil-Based Lubricant Additives 被引量:10
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作者 CHEN Zhe LIU Yuhong LUO Jianbin 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2016年第2期439-444,共6页
The performance of a lubricant largely depends on the additives it involves. However, currently used additives cause severe pollution if they are burned and exhausted. Therefore, it is necessary to develop a new gener... The performance of a lubricant largely depends on the additives it involves. However, currently used additives cause severe pollution if they are burned and exhausted. Therefore, it is necessary to develop a new generation of green additives. Graphene oxide(GO) consists of only C, H and O and thus is considered to be environmentally friendly. So the tribological properties of the few-layer GO sheet as an additive in hydrocarbon base oil are investigated systematically. It is found that, with the addition of GO sheets, both the coefficient of friction(COF) and wear are decreased and the working temperature range of the lubricant is expanded in the positive direction. Moreover, GO sheets has better performance under higher sliding speed and the optimized concentration of GO sheets is determined to be 0.5wt%. After rubbing, GO is detected on the wear scars through Raman spectroscopy. And it is believed that, during the rubbing, GO sheets adhere to the sliding surfaces, behaving like protective films and preventing the sliding surfaces from contacting with each other directly. This paper proves that the GO sheet is an effective lubricant additive, illuminates the lubrication mechanism, and provides some critical parameters for the practical application of GO sheets in lubrication. 展开更多
关键词 tribological properties graphene oxide sheets lubricant additive hydrocarbon base oil
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Coal Tar Derived Metallocene Catalyst for Polymerization of 1-Decene into Low-viscosity Poly-α-Olefin Lubricating Base Oil 被引量:1
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作者 Wang Jiannan Liu Man +2 位作者 Chen Yilong Mohamed Abbas Chen Jiangang 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2022年第3期52-60,共9页
The production of poly-α-olefins(PAOs)has attracted attention due to their excellent viscosity-temperature dependence,wear characteristics,oxidative properties,and high thermal stability.In this study,indene extracte... The production of poly-α-olefins(PAOs)has attracted attention due to their excellent viscosity-temperature dependence,wear characteristics,oxidative properties,and high thermal stability.In this study,indene extracted during coal tar refining was used as a raw material to synthesize a bis(indenyl)zirconium dichloride metallocene catalyst.A PAO with low viscosity and a high viscosity index was produced via the oligomerization of 1-decene in the presence of both the prepared metallocene and a methylaluminoxane(MAO)co-catalyst.Notably,the effects of different synthesis reaction parameters,such as Al:Zr ratio,amount of catalyst,and reaction temperature,on the conversion ratio and product selectivity were investigated in detail.The produced PAO was thoroughly characterized using Fourier-transform infrared,^(13)C,and^(1)H nuclear magnetic resonance spectroscopies;gas chromatography;and viscosity measurements.At 70℃,the metallocene catalyst created more stable active sites.In addition,the alkylation effect of MAO was noticeable.Interestingly,the obtained catalysis results demonstrated that a high conversion ratio of~93%was achieved at a low reaction temperature of 70℃,with a catalyst dosage of 0.0848 mmol and Al:Zr ratio of 8.48mmol:0.0848mmol.Moreover,under these optimal conditions,the kinematic viscosity of PAO was 4.25 mm2/s at 100℃,and the viscosity index was 139,indicating good viscosity-temperature properties. 展开更多
关键词 lubricant base oil poly-α-olefin coal tar metallocene catalyst POLYMERIZATION
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Preparation and Characterization of Multiester Derivative from Plant Oil as Base Stock for Biolubricants
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作者 Li Xiong Chen Ligong 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2020年第2期122-128,共7页
As an alternative to petroleum-based lubricants, which are harmful to the environment in excessive amounts, a biodegradable multiester derivative(OFANE) was obtained from plant oil through a chemical modification proc... As an alternative to petroleum-based lubricants, which are harmful to the environment in excessive amounts, a biodegradable multiester derivative(OFANE) was obtained from plant oil through a chemical modification process with four steps as follows: hydrolysis, esterification, epoxidation, and ring-opening reaction. The physical and chemical properties of OFANE, such as viscosity, acid value, pour point, evaporation loss, and oxidation induction time were measured. Results showed that OFANE had good low-temperature fluidity, thermal-oxidative stability, and tribological properties. The tribological properties of OFANE with dimeric acid additive were evaluated. The final biodegradation experiment indicated that OFANE had excellent biodegradability. The prepared OFANE showed great potential as substitute for petroleum-based lubricating base oils. 展开更多
关键词 plant oil multiester derivative lubricant base oil physicochemical property tribological property
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Characterization and Modification of Indonesian Natural Zeolite for Hydrocracking of Waste Lubricant Oil into Liquid Fuel Fraction
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作者 Wega Tnsunaryant Akhmad Syoufian Suryo Purwono 《Journal of Chemistry and Chemical Engineering》 2013年第2期175-180,共6页
Modification and characterization of natural zeolite under some various methods for hydrocracking catalyst of waste lubricant to gasoline and diesel fractions have been conducted. Natural zeolite from Klaten was activ... Modification and characterization of natural zeolite under some various methods for hydrocracking catalyst of waste lubricant to gasoline and diesel fractions have been conducted. Natural zeolite from Klaten was activated using hydrothermal treatment at temperature 500 ℃ for 6 h (produced ZAAHd), the ZA sample was treated with hydrothermal followed by Microwave (produced ZAAHdM), the ZA sample was treated with HCI 3 N at temperature of 90 ℃ for 30 min (produced ZAAH), the ZAAH sample was heated in to microwave (produced ZAAHM), the ZAAHM was treated hydrothermal (produced ZAAHMHd), the ZAAHMHd sample was heated in to microwave (produced ZAAHMHdM), soaking of natural zeolit activated by HCl-microwave-hydrothermal-microwave in NH4NO3 1 N which was stirred using stirer at room temperature for 24 h (produced ZAAHMHdMN) and the ZAAHMHdMN sample was heated into microwave (ZAAHMHdMNM). The heating process by microwave was conducted at 550 watt for 15 rain. Catalyst characterization involved determination of the number of total acid sites using gravimetric method with vapour adsorption of NH3 and pyridine, catalyst crystallinity by XRD (X-ray diffraction) and TO4 (T= Si and AI) site by infra red spectrophotometer (IR). Hydrocracking of waste lubricants oil was performed in a fixed bed reactor of stainless steel at temperature of 450 ℃, H2 flow rate of 15 mL/min., feed/catalyst ratio of 5. Liquid products of the hydrocracking were analyzed using GC (gas chromatography). The characterization results showed that various modification of natural zeolite increased acidity and dealumination degree of the catalysts. Products of the hydrocracking were liquid, coke, and gas fractions. Liquid products consisted of gasoline fraction (C5-C12), diesel fraction (C12-C20), and heavy oil fraction (〉 C20).Thc conversion of liquid products was increased with the increase of catalyst acidity. The greatest liquid product conversion was produced by the ZAAHMHdMNM catalyst, i.e., 56.80%, with selectivity towards gasoline, diesel, and heavy oil fractions was 88.37%, 8.61% and 3.02%, respectively. The increase of catalyst acidity increased the selectivity of gasoline fraction. 展开更多
关键词 Natural zeolite CHARACTERIZATION MODIFICATION HYDROCRACKING waste lubricant oil.
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Genome assembly of the Brassicaceae diploid Orychophragmus violaceus reveals complex whole-genome duplication and evolution of dihydroxy fatty acid metabolism 被引量:1
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作者 Fan Huang Peng Chen +9 位作者 Xinyu Tang Ting Zhong Taihua Yang Chinedu Charles Nwafor Chao Yang Xianhong Ge Hong An Zaiyun Li Edgar B.Cahoon Chunyu Zhang 《Plant Communications》 SCIE CSCD 2023年第2期93-106,共14页
Orychophragmus violaceus is a Brassicaceae species widely cultivated in China,particularly as a winter cover crop in northern China because of its low-temperature tolerance and low water demand.Recently,O.violaceus ha... Orychophragmus violaceus is a Brassicaceae species widely cultivated in China,particularly as a winter cover crop in northern China because of its low-temperature tolerance and low water demand.Recently,O.violaceus has also been cultivated as a potential industrial oilseed crop because of its abundant 24-carbon dihydroxy fatty acids(diOH-FAs),which contribute to superior high-temperature lubricant properties.In this study,we performed de novo assembly of the O.violaceus genome.Whole-genome synteny analysis of the genomes of its relatives demonstrated that O.violaceus is a diploid that has undergone an extrawhole-genome duplication(WGD)after the Brassicaceae-specific a-WGD event,with a basic chromosome number of x=12.Formation of diOH-FAs is hypothesized to have occurred after the WGD event.Based on the genome and the transcriptome data from multiple stages of seed development,we predicted that OvDGAT1-1 and OvDGAT1-2 are candidate genes for the regulation of diOH-FA storage in O.violaceus seeds.These results may greatly facilitate the development of heat-tolerant and eco-friendly plant-based lubricants using O.violaceus seed oil and improve our understanding of the genomic evolution of Brassicaceae. 展开更多
关键词 Orychophragmus violaceus genome evolution dihydroxy fatty acids polyestolides lubricant oil oilSEED Brassicaceae
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