Journal of Cleaner Production
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2021
·
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
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化学工程
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DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2022
·Vol. 101
·期 5
·2835-2841
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IF 2.5
Wei Yuan,Yidi Zhao,Yu Zhang,Shanshan Ma,Yinlu Sun
Deep eutectic solvents (DESs) are a kind of potential lixiviant for extraction processing. Unlike conventional ionic liquids (ILs), DESs are relatively cheap and environmentally friendly. Herein, three different ChCl-based DESs, namely, choline chloride/urea, choline chloride/ethylene glycol, as well as choline chloride/propandioic acid, were synthesized and used to enhance bitumen recovery from oil sand by petroleum ether extraction. The results showed a multiphase system formed after mixing the components at ~25°C, consisting of sands and clays, a DES layer, and a petroleum ether layer containing the bitumen. These DESs were immiscible with bitumen or petroleum ether. Coupled with a density difference, a clear phase separation was presented between the bitumen–petroleum ether mixture and DES. The DES functioned as a separating agent, keeping the petroleum ether–bitumen mixture and spent sand apart from each other. The results showed that the bitumen recovery was increased by ~12% compared with that without the DESs. We deduced that the enhancement in the separation may result from the reduction of adhesion between bitumen and sand by the DESs. The ChCl-based DESs and petroleum ether could be readily recycled to reduce industrial costs. After 10 cycles, the bitumen recovery remained above 86%.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2019
·Vol. 98
·期 5
·1157-1163
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IF 1.61
Pengcheng Hu,Ruimin Chai,Quanyou Liu,Junlin Wang,Shu-Feng Zhou
Dissolution-precipitation is a novel high-efficiency method for separating oil-wetted oil sands. Four dissolving agents and three precipitating agents were studied to select the optimal combination. Results showed that N,N -dimethylcyclohexylamine (DMCHA) and methanol were the optimal dissolving and precipitating agents, respectively. The chemical group compositions, element content, and H/C atom ratio of bitumen separated by DMCHA-methanol were analyzed, and the optimal conditions for oil sands separation were determined, under which the bitumen recovery reached 96.4%. After six separation cycles with DMCHA-methanol, the bitumen recovery remained above 93%.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
LANGMUIR
·
2024
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IF 3.7
Shaoyang Liu,Jie Qi,Yuzhe Li,Ruiyao Wang,Li Wang,Hongsheng Lu,Zheng Zhang
The reversible shift in polarity or hydrophilicity/hydrophobicity of switchable solvents greatly simplifies the recovery capacity in extraction applications. However, the environmental and economical advantages of switchable solvents are not significant. In this work, we designed three pH-responsive natural deep eutectic solvents (NADESs) by combining the pH-switchable solvent fatty acids with the nonswitchable solvent ethyl lactate (EL), followed by the exploration of the solubilization and separation performance of these NADESs for petroleum hydrocarbons. EL can be miscible in fatty acids and water; however, when in contact with both at the same time, EL binds to fatty acids through stronger intermolecular hydrogen bonds, whereas when fatty acids are deprotonated to fatty acid salts, EL can bind to water. The deprotonation/protonation of fatty acids could reversibly change the NADES hydrophilicity, and the recovery of NADES HA/EL could exceed 95% after three cycles. Furthermore, after extractive separation of simulated oils of differing complexity, NADES HA/EL was selected as the best extractant. Compared with the extraction of oil sands with a single solvent, NADES provides better wetting of the sand surface, better stripping efficiency of the heavy components that adhere to the surface of oil sands, and better dispersion of the stripped petroleum hydrocarbons. Petroleum hydrocarbons can be separated by NaOH-induced hydrophilic changes in NADES, which can be regenerated upon the addition of HCl. The recovered NADES showed good reusability in the cleaning of oil sands. The oil removal rates were 96.9%, 94.4%, and 91.9% after three cycles of cleaning with NADES at 25 °C. This method is expected to expand the application of nonswitchable solvents in sustainable extraction.
研究领域:
环境科学
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化学工程
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能源技术
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DOI
PubMed
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
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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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DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2021
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IF 2.262
Li Chao,Haiwang Wang,Xinfang Wei,Jinlong Li,Cheng Ji,Xiwei Qi
At present, the polymer flocculation technology has been widely used in the treatment of oil sand tailings. However, the current composite flocculant still has the problems of low flocculation efficiency and serious secondary pollution after using. In this article, cationic composite flocculant SiO2-TiO2-P(AM-DMC) with self-degrading characteristics was prepared by the surface photoinitiated polymerization technique. Above all, in order to study the synthesis process of SiO2-TiO2-P(AM-DMC), cationic composite flocculant was characterized by FTIR, TG, TEM, XPS, etc. Furthermore, the central composite design (CCD) and response surface methodology (RSM) were used to optimize the preparation parameters of the cationic composite flocculant. And the optimization results of preparation parameters of cationic composite flocculant showed that the optimal preparation parameters of SiO2-TiO2-P(AM-DMC) were as follows: mDMC: mAM = 5, monomer concentration was 35% and reaction time was 100 min. Ultimately, the flocculation parameters of SiO2-TiO2-P(AM-DMC) were optimized by CCD and RSM. Moreover, the optimization results of flocculation parameters of cationic composite flocculant showed that the optimal flocculation parameters of SiO2-TiO2-P(AM-DMC) were as follows: pH = 5, flocculant dosage was 30 ppm, kaolin concentration was 1.36%. In summary, this work had greatly enriched the knowledge of oil sand tailings treatment, and had the extremely important reference significance for realizing the parameter regulation of high-efficiency flocculation of oil sand tailings.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Xiaojiang Li,Leitao Sun,Xin Lv,Jie Qi,Hongsheng Lu,Yuanpeng Wu,Baogang wang
Petroleum hydrocarbons pollutants are the serious environmental hazards in the exploitation of petroleum resources. As comparison to the traditional solvent for petroleum hydrocarbons removal, deep eutectic solvents (DESs), as the ideal alternate for organic solvents, have non-toxicity, non-flammability and lower volatility. Whereas, the recycling of DES is still the great challenge for sustainable separation. Herein, hydrophobic DESs (HDESs) with the CO 2 switchable-hydrophilicity are developed, aiming to sustainably separate petroleum hydrocarbons pollutions. The HDESs are formed by hydrogen bonds between the phenolic compounds as hydrogen bond donors (HBDs) and tertiary amines as hydrogen bond acceptors (HBAs), which was demonstrated by the spectroscopic detection. Interestingly, the HDES exhibits better CO 2 -switchable behavior than traditional switchable-solvent, where the phase transition is induced by the protonation of HBA upon CO 2 and the deprotonation of HBD in HCO 3 - solution of HBA. Furthermore, the sustainable separation for oils (heptane, diesel oil and crude oil) is successfully completed, and the HDES is also easily recovered upon N 2 /65 °C. Finally, the HDES is effectively applied in removing petroleum hydrocarbons from oily wastes (oil sands and oily sludge). The results show that more than 98% oil is removed from oil sands, and 85.02% oil is also removed from oily sludge . Thus, the HDESs will be expected to treated as the effective extractant for sustainable and cleaner separation of petroleum hydrocarbons- contaminated waste.
研究领域:
环境科学
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化学工程
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高影响因子
Materials
·
2021
·Vol. 14
·期 4
·797
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IF 3.623
Xiaoguang Pei,Weiyu Fan
Oil sands de-oiled asphalt (OSDOA) has become a bottleneck for refineries due to its enormous production and huge landfill costs. Applying OSDOA as a modifier is an effective way to reduce environmental pollution and disposal cost. In this study, the influences of OSDOA and polyphosphoric acid (PPA) compound modification on styrene-butadiene-styrene (SBS)-modified binder were investigated. The high-temperature rutting resistance, low-temperature anti-crack performance and fatigue resistance were obtained by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) test. Storage stability and microstructure were also investigated by storage test and Fourier-transform infrared (FTIR) spectroscopy. The results demonstrated that the compound modification of OSDOA/PPA dramatically enhanced the deformation resistance of SBS-modified binder and reduced its low-temperature cracking resistance. The anti-fatigue performance was also decreased. Moreover, the combined effect of OSDOA and PPA could produce composite modified asphalt with excellent storage stability, which was verified by desirable fluorescence images. Furthermore, both physical and chemical interactions coexisted during the OSDOA/PPA compound modification process. Consequently, the optimal doses of OSDOA and PPA were determined to be 10 wt% and 1.0 wt%, considering of the balance between high- and low-temperature characteristics and storage stability of composite modified asphalt.Keywords:composite modified asphalt;rheological properties;storage stability;microstructure;oil sands de-oiled asphalt;polyphosphoric acid
研究领域:
土木工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Lin Song,Han Jia,Fuling Zhang,Haidong Jia,Yuanbo Wang,Qiuyu Xie,Fangning Fan,Qiang Wang,Shijie Wen
Surfactant-free microemulsions (SFMEs) have been explored extensively to avoid the residual surfactant problem caused by traditional surfactant microemulsions. Many researchers focused on the SFMEs with tertiary amine, which exhibited the typical CO2 response behavior. In this study, the phase diagram of the SFMEs consisting of tripropylamine (TPA), ethanol, and water was readily prepared via the measurements of electrical conductivity. The CO2 response behavior of SFME was confirmed by determination of conductivity and measurement of the average diameter of SFME, which was mainly dependent on the protonation of TPA induced by the additional CO2. The transition of protonated TPA to a more hydrophilic nature from lipophilicity to hydrophilicity should be responsible for the variation of SFME average diameter. In addition, the SFMEs exhibited remarkable solubilizing capacity of crude oil, and three types of SFMEs achieved more than 80% oil removal rate in the washing process of oil sands. It was noted that both oil-in-water and bicontinuous SFMEs could be circularly utilized at least three times with a relatively high oil removal rate (%). Our work provided the insight perspective on the mechanism of SFMEs with a CO2 response behavior.
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
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 98
·期 10
·2577-2586
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IF 3.4
Shili Yan,Jiamei Zhu,Hongmin Wang,Bingqian Liu,Qinling Bi
BACKGROUND Heavy oil has the characteristics of high viscosity and low American Petroleum Institute gravity, which makes it difficult to transport and produce. The key to efficiently utilizing heavy oil is reducing viscosity and improving quality. Hydroconversion has the advantages of viscosity reduction and decreased coke production, but it is difficult to separate nonmagnetic catalysts from the reaction system, which affects the industrial application. RESULTS A spherical Fe 3 O 4 (74.71 emu g −1 ) and a chain Fe Fe 2 O 3 (110 emu g −1 ) were prepared as magnetic cores, and coated with SiO 2 and Al 2 O 3 layers, respectively. The metal-supported catalyst modified with Co and Ni show irregular and honeycomb-shaped surfaces, and the magnetic saturation strength decreases to 24.91 and 14.63 emu g −1 , but still possessing superparamagnetic properties, enabling the catalysts to be separated from the reaction mixture. Fe-Fe 2 O 3 @SiO 2 @Al 2 O 3 @CoNi catalyst has the best viscosity reduction effect for Canadian oil sands asphalt residue at about 410 °C and 10 MPa hydrogen pressure. The viscosity of the liquid product decreased significantly from 56 600 to 135 mPa s at 50 °C, with a viscosity reduction of 99.8%. CONCLUSION Magnetic catalyst prepared from chain-like Fe-Fe 2 O 3 has an excellent honeycomb structure, which can provide increased active surfaces and exhibit improved viscosity reduction performance. This work provides a strategy for the recovery of heavy oil hydrogenation catalysts and is expected to play a key role in the practical application of heavy oil hydrogenation catalytic viscosity reduction. © 2023 Society of Chemical Industry.
研究领域:
化学工程
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催化
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石油工程
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）