Arabian Journal of Chemistry
·
2022
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IF 6.212
Jinjian Hou,Fei Song,Xinyu Ji,Shuanglong Lin
The oily sludge would cause environment pollution, and would cause the heavy oil waste. Therefore, it was vital for us to find novel methods to obtain heavy oil from the oily sludges. In this study, the [C 12 mim][PF 6 ] and [C 12 mim][Br] ionic liquids(ILs) were used to enhance the oil recovery. The toluene could obtain the highest oil recovery, and both the two ILs could increase the oil recovery. Toluene could obtain the highest oil recovery (89.4 wt%), and n -octane could obtain the lowest oil recovery (76.8 wt%). [C 12 mim] [PF 6 ] could efficiently increase the heavy oil recovery to 91.2 wt%(by toluene). The [C 12 mim][Br] could increase the heavy oil recovery further. Both the [C 12 mim] [PF 6 ] and the [C 12 mim][Br] ionic liquids could increase the heavy ois C/H ratio, decrease heavy oil viscosity and increase the sands hydrophilicity. The [C 12 mim][Br] ionic liquids showed better effect. In addition, the ionic liquids could increase the solvents recovery, and the ionic liquids recovery were high. Therefore, the ionic liquids enhanced oil recovery could be recycled to ten times. The two ionic liquids could effectively decrease the heavy oil interaction force, and when the ionic liquids increased to 200 ppm, the force remained stable. In the end, the ionic liquids enhancing solvent extraction mechanism was put forward.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Xiaoxiao Wei,Yi Liu,Yadan Luo,Zheng Shen,Shuangfei Wang,Mingfu Li,Liming Zhang
In this study, three lignin fractions F1, F2, and F3 were obtained from eucalyptus kraft lignin (EKL) by solvent extraction with ethyl acetate, acetone, and acetone/water. The antioxidant activity of these lignin fractions were measured and evaluated by using the DPPH radical scavenging activity, ABTS radical cation scavenging activity and ferric reducing antioxidant power analysis. These lignin fractions were also characterized by applying Gel permeation chromatography , Fourier transform infrared, 31 P NMR and 2D HSQC NMR techniques. The three different lignin fractions had rather different average molecular sizes, as well as different phenolic and methoxy functional contents. The ethyl acetate fraction (F1) with the lowest average molecular weight (2342 g/mol) and the highest phenolic hydroxyl content (4.2457 mmol/g) and methoxy groups (6.2714 mmol/g) showed high homogeneity and the highest antioxidant activity. Its DPPH scavenging activity, ABTS + scavenging activity, and ferric reducing the antioxidant power were 68.67%, 75.57%, and 91.89 μmol/g, respectively. Moreover, the antioxidant activity of F1 and F2 was found to be higher than that of butylated hydroxytoluene. Therefore, solvent extraction was shown to be an effective way to separate lignin fractions with high homogeneity, high antioxidant activity, which could lead to application of lignin with higher value.
研究领域:
植物化学
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林产化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
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IF 2.6
Jingwei Cao,Hongyue Guo,Qingsong Li
Ternary liquid–liquid phase equilibrium (LLE) data of water + 3-pentanone + extractants (methyl tert-butyl ether, 2-ethyl-1-hexanol, o-xylene, ethyl acetate) were measured to separate 3-pentanone of high purity from aqueous solutions at 308.2 K under 101.3 kPa. The ability to extract 3-pentanone from aqueous solutions was assessed by distribution coefficient (D) and separation factor (S). Hand and Bachman equations tested the reliability of the experimental data with linear coefficients (R2) not less than 0.99. Meanwhile, UNIQUAC and NRTL thermodynamic models regressed experimentally measured data to get the optimal binary interaction parameters, and the root mean square deviation (RMSD) was not more than 0.4%. The GUI-MATLAB program verified the consistency of binary parameters obtained from the NRTL model well.
研究领域:
化学工程
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热力学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
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IF 7.926
Yuansi Hu,Xinglong Chen,Shiqi Mu,Qibin Li
Oil-based drilling cuttings (OBDC) have a high content of petroleum pollutants with strong mutagenic, carcinogenic and teratogenic properties. Solvent extraction can effectively separate petroleum pollutants from OBDC. However, single solvent has preferred solubility for different types of petroleum pollutants in OBDC, resulting in a lower oil removal efficiency. Therefore, based on the polarity difference between methanol (Me) and n-hexane (He), a method was developed to extract petroleum pollutants from OBDC using Me&He. Compared with methanol or n-hexane alone, the oil removal efficiency of compound Me&He was significantly increased to 94.58 %, and 37, 37 and 77 petroleum pollutants were extracted using Single methanol, Single n-hexane and Compound Me&He, respectively. Methanol extraction preferentially solubilised polar molecules such as alcohols and carboxylic acids , while n-hexane extraction preferentially solubilised alkanes and other nonpolar molecules. Compound Me&He compensated for the low solubility of single solvents for petroleum pollutant extraction from OBDC. Additionally, because methanol and n-hexane are not mutually soluble, it was easy to separate the recycled components. Compared with other common solvent extraction technologies, compound Me&He had advantages including simple operation and high oil removal efficiency. This study provided a theoretical basis and technical reference for the efficient processing and resource recycling of OBDC.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
FOOD CHEMISTRY
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2016
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IF 4.052
Li Ma,Lin Wang,Jie Tang,Zhaoguang Yang
Statistical experimental designs were employed to optimize the extraction condition of arsenic species (As(III), As(V), monomethylarsonic acid (MMA) and dimethylarsonic acid (DMA)) in paddy rice by a simple solvent extraction using water as an extraction reagent. The effect of variables were estimated by a two-level Plackett–Burman factorial design. A five-level central composite design was subsequently employed to optimize the significant factors. The desirability parameters of the significant factors were confirmed to 60 min of shaking time and 85 °C of extraction temperature by compromising the experimental period and extraction efficiency. The analytical performances, such as linearity, method detection limits, relative standard deviation and recovery were examined, and these data exhibited broad linear range, high sensitivity and good precision. The proposed method was applied for real rice samples. The species of As(III), As(V) and DMA were detected in all the rice samples mostly in the order As(III) > As(V) > DMA.
研究领域:
食品科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
Journal of Essential Oil Bearing Plants
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2022
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IF 1.971
Weilong Zheng,Fang Wu,Xi Luo,Caimiao Bian,Yingying Zhang,Fengwei Yin,Haiyu Liu,Yongqian Fu
Large amounts of citrus peel are discarded as solid waste owing to the lack of recycling methods. In this study, mixed solvent extraction combined with multi-phase salting-out extraction was performed to explore the extraction process of essential oil and hesperidin. Optimal conditions were used for mixed solvent extraction (citrus peel 6%; ratio of ethanol to n-hexane 1:5; duration, stirring speed, and temperature were 150 min, 120 r/min, and 45°C, respectively) and multi-phase salting-out extraction (citrus peel residue 10%; ratio of salt to ethanol 19:24; mass fraction of n-hexane 25%; extraction duration 120 min). Under two-step extraction conditions, 63.74±2.40% essential oil and 27.13±1.36% hesperidin were recovered, with total extraction efficiencies of 5.19±0.09 and 1.91±0.25%, respectively. The amplification effect was not significant, and the organic solvents could be reused three times while maintaining 80% recovery in both steps to balance the commercial cost and extraction efficiency.
研究领域:
食品科学
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植物化学
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DOI
高影响因子
GREEN CHEMISTRY
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2020
·Vol. 23
·期 1
·405-411
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IF 9.48
Huiyong Wang,Jingjing Cui,Yuling Zhao,Zhiyong Li,Jianji Wang
Ionic liquids (ILs) have been widely studied as effective reaction media or catalysts for the conversion of renewable resources to 5-hydroxymethhylfurfural (5-HMF). However, the separation of 5-HMF from ILs remains a significant challenge. Thus, the aim of this work is to develop a useful guideline for the selection and design of greener solvents for efficient separation of 5-HMF from ILs by a simple solvent extraction approach. To this end, 9 kinds of low-toxic and medium boiling point organic solvents and 10 kinds of ILs typically used in biomass conversion have been evaluated for the separation of 5-HMF. The effects of the solvent hydrogen bond acceptor capacity, anion type and cationic structure of the ILs on the separation of 5-HMF from the ILs are systematically investigated and the molecular interactions among 5-HMF, ILs and the solvent contained in the mixtures have been revealed by FTIR and 1H NMR measurements. It has been found that besides a low mutual solubility with ionic liquids, an ideal solvent should have strong hydrogen bond acceptor properties. At the same time, the interactions between the anion and cation of the ILs and the hydrogen bonding interaction of the anion with 5-HMF are also very important for the separation of 5-HMF. A weak interaction of the anion with 5-HMF and a strong interaction between the anion and cation of the ILs all result in the high extraction efficiency. Under the optimized conditions, the extraction efficiency of 5-HMF from the ILs is up to 61.0%, which is a record-breaking value at the current time. This finding provides a useful guide for the selection of greener solvents for the separation of 5-HMF from ILs.
研究领域:
化学工程
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可再生资源转化
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2019
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IF 3.073
Kun Chen,Di Zhang,Yang Dai,He Liu,Zongxian Wang,Ummul-Khairi Ibrahim,Aijun Guo
Suspended particles (SPs) were separated from an FCC Slurry Oil (SLO) via centrifugation with the aid of toluene-dilution. Further solvent extraction of SPs with CS 2 /toluene (50 V/V%) mixed solvent would generate solvent extraction insolubles (SEINS) and solubles (SES). They were sent for a series of chemical and structural characterizations, respectively, in the hope of providing clues to address issues from sedimentation and clarification processes. It was found that SPs were composed of catalyst fragments and organic substances wrapped around them, serving as a shield. The characterizations from TEM and XPS strongly suggested that the outer surface of SEINS was sufficient in oxygen-containing sites (organic functional groups and aluminosilicate), while the outer surface of SPs was not. High oxygen content and almost same nitrogen content of SES, comparable with that of asphaltenes, were detected through XPS characterization. This rationalized the strong adsorption of SES on SEINS in the form of a tedious solvent extraction process. A new structure of SPs has thus been described on the basis of these characterizations. Design sedimentation experiments verified the SPs’ structure. Furthermore, the experiments offered a promising way for acquiring high clarification efficiency with rather low usage of sinking agent through solvent pretreatment.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Daoping Ye,Wenxiang Tang,Tao Zhang,Li Lv,Zongpeng Zou,Raju Kumar Gupta,Shengwei Tang
CO 2 hydrogenation to olefines is a feasible carbon capture and utilization (CCU) route. The process includes sequential reactions of reverse water gas shift (RWGS) reaction and Fischer-Tropsch synthesis (FTS) reaction. The acceleration of FTS is crucial to improve the olefines yield. A microemulsion anti-solvent extraction (MAE) method was proposed to prepare Fe-based catalyst on the support of Al 2 O 3 . Ethanol solution of Fe(NO 3 ) 3 was encapsulated in microdroplets, and then loaded on Al 2 O 3 by the extraction of ethanol from the microdroplets to isooctane phase. The average size of micro droplets was 7.5 nm. After calcination , the particle size of Fe 2 O 3 was 6 nm. After carburization with CO, the interface formed between Fe 3 O 4 and Fe 5 C 2 was restricted in a narrow space with a mean size of 12 nm. Through TEM-Mapping, XRD , XPS and TPC characterization, the distribution uniformity of Fe and the neighboring degree of Fe 3 O 4 and Fe 5 C 2 on the as-prepared catalyst MAE-Fe 1 K 1 was improved effectively. An enhanced synergistic effect between Fe 3 O 4 and Fe 5 C 2 was obtained. The catalytic performance evaluation results showed that yield of C 2 -C 4 olefins reached 0.063 mmol·gFe −1 ·s −1 after 12 h of reaction. It exhibited better catalytic performance than most catalysts reported in the literatures. The results showed that the proposed microemulsion anti-solvent extraction strategy is an effective method to prepare Fe-based catalyst for CO 2 -FTO reaction with an excellent catalytic performance.
研究领域:
催化化学
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材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2022
·
IF 3.269
Song Lin,Mingyi Xu,Mai Han,Houchun Yan,Yufan Pang,Qingsong Li
The liquid–liquid equilibrium (LLE) data of water + 1,2-Dimethoxyethane (DME) + {isopropyl ether, 1-hexanol, n-heptanol and 4-methyl-2-pentanol (MIBC)} was measured at 303.2 K under 101.3 kPa. The distribution coefficient (D) and selectivity factor (S) based on the experimental data were calculated, and use this to evaluate the extraction effect of the four solvents. Using two thermodynamic models of NRTL and UNIQUAC to fit the experimental data, and obtained the binary interaction parameters. The root means square deviation (RMSD) of the fitting results were all less than 0.75%. The GUI-MATLAB tools were applied to verify the consistency of the binary interaction parameters.
研究领域:
化学工程
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物理化学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·
IF 1.911
Jie Li,Zhijian Peng,Chunshan Li,Ping Li,Rafiqul Gani
In this work, a techno-economic study for the solvent based extraction of methacrylic acid from an aqueous solution is presented. The involved phase equilibrium calculations in process design are verified by measured experimental data. First, experiments are conducted with different solvent candidates to measure LLE (liquid–liquid equilibrium) data and to establish the effects of extraction temperature and dosage of solvent. Next, the binary interaction parameters for the UNIQUAC model to be used for equilibrium calculations are fine-tuned with measured data. Then, a process for the solvent based extraction of methacrylic acid recovery is designed and verified through simulation with the regressed UNIQUAC model parameters. The optimal configuration of the process flowsheet is determined by minimizing the total annualized cost. Among the three solvent candidates considered-cyclohexane, hexane and toluene-the highest efficiency and the lowest total annualized cost is found with toluene as the solvent.
研究领域:
化学工程
·
工艺经济分析
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Jinjian Hou,Wenjuan Wang,Zanli Fu,Yuting Hu,Zhongchi Wu,Xiaojin Wu,Jianan Hu,Haiming Yu,Gaobo Yu,Jiacheng Li
In recent years, heavy oil-solid separation has attracted quantities of attention, and ionic liquids (ILs) enhanced solvent extraction has been widely studied. However, the detailed mechanism of ILs effect onto the heavy oil recovery was unclear, especially the interaction role between ILs and heavy oil SARA. In order to solve these problems, this paper used the experiment and molecular dynamics simulation methods to explore the four ILs ([Bmmim][PF 6 ], [C 12 mim][Ac], [C 12 mim][BF 4 ], and [Emim][Ac]) effect on enhancing the solvent extraction for oil sands. The experimental results showed that the ILs could enhance the solvent extraction process, improve heavy oil recovery, reduce bitumen viscosity, decrease oil-sand interaction force, alter the sand particles wettability. The extraction efficiency of [Bmmim][PF 6 ] + toluene reached 93.9 %. Additionally, molecular dynamics (MD) simulations were conducted to analyze the interaction mechanisms between heavy oil SARA (saturates, aromatics, resins, asphaltenes) and solvents and ILs. The simulations results indicated that the saturates, aromatics, resins and asphaltenes have different interaction role with the different ILs under varieties of solvents, and the interaction role strength was related to the functional groups and heteroatom. In the end, the detailed mechanism of ILs enhancing solvent extraction for oil sands was put forward.
研究领域:
石油工程
·
化学工程
·
分子模拟
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）