Journal of Cleaner Production
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2021
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IF 9.297
Xiaojiang Li,Li Wang,Hongsheng Lu,Na Wang,Baogang Wang,Zhiyu Huang
Surfactant extraction is the common method for treating oil sands. However, the recovery of traditional surfactant is difficult, and the oil emulsification phenomenon and generation of tailings are also caused easily. To develop the cleaner and sustainable approach for treating oil sands, a switchable water N, N, N′, N′ -tetramethylhexanediamine (TMHDA) was used to improve extraction by surfactant sodium dodecyl benzene sulfonate (SDBS) solution with low concentration. Here, the TMHDA-containing SDBS solution has CO 2 switchability because of the electrostatic interaction between SDBS solution and TMHDA with CO 2 response, and can be also emulsify reversibly n-heptane, diesel oil, even crude oil, providing the possibility for separating oil from oil sands. The effective extraction of oil sands is performed by 1 mM (less than critical micelle concentration (CMC)) SDBS solution combined with TMHDA, which was also demonstrated by thermogravimetric analyzer, scanning electron microscope and elemental analysis. The residual oil content of oil sands is reduced to 0.515 wt% and 90.8% oil is removed by adding 0.15 g/mL TMHDA. Interestingly, oil is separated and fine sands is separated by introducing CO 2 , and the TMHDA-containing SDBS is recycled upon N 2 /65 °C.According to the detection of interfacial tension and Fourier Transform Infrared Spectroscopy (FTIR), it is demonstrated that the improved oil removal is ascribed to the adsorption of SDBS on solid surface and the reduced oil-water interface tension by the addition of TMHDA. Based on the evaluation of economic and environmental value, this sustainable approach exhibits potential application for treating oil sands in practical industry.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Xin Lv,Xiaojiang Li,Yang Ge,Qingping Li,Hongsheng Lu
In this work, the approach for separating paraffin wax is proposed by using Span 80 combined with switchable water N,N,N′,N′-tetramethyl-1,6-hexanediamine (TMHDA), where the emulsification of paraffin wax can be promoted and paraffin wax is also separated sustainably. Here, the Span 80-containing mixture system exhibits an enhanced emulsification ability and CO2-switchable behavior upon the addition of TMHDA. Then, the paraffin wax is effectively emulsified by this switchable system containing Span 80 and TMHDA. Based on the detection of water separation rate, rheological behavior, and micrographs of emulsified paraffin wax, it is found that the emulsification of paraffin wax can be improved by increasing the paraffin wax content and Span 80 content, and the viscosity of the paraffin wax is reduced after emulsification by this switchable system, which ascribes to the dispersion of wax crystals. In addition, the paraffin wax is separated upon introducing CO2, and the TMHDA solution is recovered upon treating with N2 at 65 °C after separating the paraffin wax. The sustainable separation of paraffin wax results from the aggregation of wax crystals because of the reduced obstruction of oil droplets for wax crystals caused by the high ionic strength and the reduced surface activity of this system upon introducing CO2. Herein, it is expected that this sustainable separation can be applied in deposited wax removal in pipelines of crude oil transport.
研究领域:
化学工程
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能源科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
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2019
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IF 6.395
Xiaojiang Li,Hongsheng Lu,Dongfang Liu,Guijiang Yan,Shanshan Dai,Zhiyu Huang
Switchable-Hydrophilicity Solvent (SHS) with high volatility is obstruct to environmental protection and solvent recycling in extraction process. This research aims at providing a cleaner and more sustainable approach of washing oil sands by using the CO 2 -responsive Composite Switchable Water (CSW). This CSW was prepared by Di-n-propylamine (DPA), N,N -dimethylethanolamine (DMEA) and water. The formation of CSW is attributed to the interaction between DPA and DMEA, which was detected by nuclear magnetic resonance hydrogen spectrum ( 1 HNRM). The different CO 2 switchable behaviors of CSW were demonstrated by the variety of conductivity and pH. Although DPA belongs to one of the SHS with high toxicity and volatility, the resulting CSW represents much lower volatility and more stability at room temperature and ambient pressure . The results show that the oil content of oil sands reduces to 2.36 wt% by using CSW with the volume ratio of 2 : 3 between DPA and DMEA aqueous solution (the volume ratio between DMEA and water is 1 : 1). Fourier Transform Infrared Spectroscopy (FT-IR) was used to demonstrate the removing of oil from the sands after being treated with CSW. The reversible change of conductivity shows the recycling ability of CSW. Finally, the economic and environmental value of washing oil sands with CSW was calculated.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
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2018
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IF 5.503
Xiaojiang Li,Hongsheng Lu,Dongfang Liu,Baogang Wang
In this article, the composite switchable water was prepared with hydrophobic tertiary amine and switchable water, which provides a new method for washing oil sands. Firstly, pH and 1 HNMR were used to demonstrate that N,N- diethylethanolamine (DEEA) with the excellent CO 2 response could be treated as potential switchable water. In addition, N,N- dimethylaniline (DMA) was chosen as a suitable hydrophobic tertiary amine, because DMA is a more steady molecular state than DEEA at the same pH. Then, the composite switchable water (DMA + DEEA(aq)) was prepared with DMA and DEEA solutions. There was the possible presence of inductive effect between DMA and DEEA detected by 1 HNRM and it was also found that DEEA reduced the surface tension. Next, the CO 2 -triggered switchable behavior of the composite switchable water has been demonstrated by pH and conductivity. Finally, a practical application of washing oil sands with the composite switchable water was accomplished. The results showed that the residual oil content of oil sands was reduced to 0.872 wt% from the original 4.64 wt% heavy hydrocarbons (the ratio of DMA in gram to DEEA solutions in mL was 4:15) and both DMA and DEEA solutions also were recycled during the process. In addition, a process for the extraction and separation of simulated oil (kerosene) with the composite switchable water was depicted to further demonstrate the behavior of dissolving oil.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
Gels
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2023
·Vol. 9
·期 4
·335
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IF 4.6
Chenghong Huang,Hong Tang,Xiaorong Huang,Hongjie Chen,Kang Yang,Qi Yin,Lin Zhang,Xia Li,Xue Mou,Shuangkou Chen,Yuchan Zhang,Yan Hu
Polymer gels are usually used for crystal growth as the recovered crystals have better properties. Fast crystallization under nanoscale confinement holds great benefits, especially in polymer microgels as its tunable microstructures. This study demonstrated that ethyl vanillin can be quickly crystallized from carboxymethyl chitosan/ethyl vanillin co-mixture gels via classical swift cooling method and supersaturation. It found that EVA appeared with bulk filament crystals accelerated by a large quantity of nanoconfinement microregions resulted from space-formatted hydrogen network between EVA and CMCS when their concentration exceeds 1:1.4 and may occasionally arise when the concentration less than 1:0.8. It was observed that EVA crystal growth has two models involving hang-wall growth at the air-liquid interface at the contact line, as well as extrude-bubble growth at any sites on the liquid surface. Further investigations found that EVA crystals can be recovered from as-prepared ion-switchable CMCS gels by 0.1 M hydrochloric acid or acetic acid without defects. Consequently, the proposed method may offer an available scheme for a large-scale preparation of API analogs.Keywords:EVA;CMCS;crystallization;nanoconfinement
研究领域:
材料科学
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化学工程
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聚合物化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2019
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IF 3.372
Shuangqing Sun,Xiqiang Zhang,Shengxiang Feng,Hongbing Wang,Yan Wang,Jianhui Luo,Chunling Li,Songqing Hu
A novel CO 2 /N 2 switchable aqueous foam was developed using a CO 2 -responsive surfactant N,N-dimethyl-N-dodecyl amine (C 12 A) and a conventional surfactant sodium dodecyl sulfate (SDS). The performance and mechanism of this switchable foam were studied by both experiment and molecular simulation methods. Experimental results demonstrate that the foam stabilized by SDS/C 12 A surfactants has better stability and water carrying capacity than single C12A foam. The foam could be rapidly switched between stable and unstable states at ambient temperature with CO 2 or N 2 as the triggers. Simulation results shows that when CO 2 was introduced, most of SDS and C 12 A molecules aggregated in the water phase, instead of adsorbing at the air-water interface to stabilize the foam films. The strong electrostatic attraction between protonated C 12 A and SDS molecules could account for the aggregation. Due to the presence of limited surfactants located at the air-water interface after introducing CO 2 , the foam bursts quickly.
研究领域:
化学
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材料科学
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胶体与表面化学
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分子模拟
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）