JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2016
·Vol. 125
·期 1
·155-162
·
IF 1.781
Liu Zhongguo,Wang Hui,Zhang Liyuan,Sun Daxin,Cheng Liang,Pang Cuicui
Sludge is an inevitable by-product of turbine oil during the operation of lubricating turbines. However, there are few reports of the detailed analytical results of the sludge. In addition, no global specification exists to evaluate the sludge formation from turbine oils. Hence, it is critical to analyze the contents of the sludge. In this study, we investigate both fresh and in-service (contains sludge) turbine oil based on ASTM standards. In-service turbine oil was first washed by petroleum ether to obtain the sludge and then characterized by FTIR, SEM, TG and EDAX. We found that the main compositions of sludge were C, O and N, while metals were <4 mass %. The analytical results show that antioxidant, defoamer, antirust and demulsifier are possible origins for the formation of sludge, which would be beneficial to decrease the sludge for the formulation of turbine 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
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Qi Li,Dejun Sun,Feng Chen,Haoran Xu,Zhenghe Xu
Hydrothermal treatment (HT) can effectively dehydrate and reduce oily sludge (OS) volume, but the resulting hydrothermal oily sludge (HOS) presents greater challenges for washing than the initial oily sludge (IOS). This study examines the effects of HT on OS by analyzing changes in water, oil, and solid. Results indicate that HT considerably decreases the water content in OS while increasing resin and asphaltenes contents. In addition, condensation, side-chain scission, and oxidation reactions occur during the HT process, resulting in coking, agglomeration, and an increase in oxygen-containing groups. This increase, further confirmed by X-ray photoelectron spectroscopy (XPS), enhances the interaction between oil and solids. Calcite, the most prevalent solid-phase component, may form a calcium bridge with the oxygen-containing groups. Moreover, HT reduces the solid particle size, thereby increasing the oil–solid contact area. Interestingly, the process of deasphalting diminishes the interaction between oil and solids, facilitating sludge washing. After washing, the residual oil content in HOS is reduced to less than 0.34%. This study elucidates why HOS is challenging to separate from oil and solids and introduces a novel method that combines dodecylbenzene sulfonic acid (DBSA)-assisted heptane deasphalting with conventional washing techniques. This method shows promise for applications in OS affected by weathering processes.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2022
·
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
✓ 已验证
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Fawei Lin,Li Xiang,Bingyan Sun,Jiantao Li,Beibei Yan,Xiaopeng He,Gang Liu,Guanyi Chen
Oily sludge (OS) is recognized as the hazardous waste and presence of Cl containing compounds causes severe potential environmental risks. This paper systematically analyzed the distribution of Cl-containing pollutants (CPs) in oil and gas that are ignored previously but have high toxicity. Three model additives, NaCl, PVC, and DCB, were selected to represent inorganic chlorine salt, organic polymers, and Cl-hydrocarbons, respectively. NaCl could retain 99 % of total Cl in the solid residue while PVC released more proportional Cl into gas, ca. 33%. A variety of organic CPs were detected in pyrolytic oil and gas with CH 2 Cl 2 and C 6 H 4 Cl 2 dominant. The synergy between OS and PVC strengthened with more PVC addition, which promoted carbonization and polymerization to generate more carbon matrix in solid residue. Pyrolysis effectively prevented formation of PCDFs compared with combustion thus exhibiting superiority on inhibiting formation of dioxins. Future work should devote to solve the environmental risks from CPs in pyrolytic products with the strategies including stabilization of Cl in solid residue and cracking of Cl-macromolecules into HCl.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Wenjie Liu,Chunyang Nie,Wenlang Li,Zhimin Ao,Shaobin Wang,Taicheng An
ABSTRACT In this work, low-cost carbon-based materials were developed via a facile one-pot pyrolysis of oily sludge (OS) and used as catalysts to activate peroxymonosulfate (PMS) for removing aqueous recalcitrant pollutants. By adjusting the pyrolysis temperature, the optimized OS-derived carbocatalyst manifested good performance for PMS activation to abate diverse organic pollutants in water treatment . Particularly, an average removal rate of 0.87 mol phenol per mol PMS per hour at a catalyst dosage of 0.2 g L −1 is attained by the OS-derived carbocatalyst, higher than many other documented catalysts. A series of experimental evidences consolidated that organic pollutants were oxidized mainly via electron-transfer mechanism albeit the detection of singlet oxygen ( 1 O 2 ) from PMS activation driven by the OS-derived carbocatalyst. Specifically, the proportion of carbonyl groups (C˭O) in the carbocatalyst adopted with selective modification treatments to tailor the surface chemistry was found to be linearly correlated with the catalytic activity and theoretical calculations demonstrated that the reactions between C˭O and PMS to form surface reactive complexes were more energetically favorable compared to 1 O 2 generation. Herein, this study not only offers a new strategy for reusing OS as value-added persulfate activators but also deepens the fundamental understanding on the nonradical regime.
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 24
·7551
·
IF 4.412
Changchao Hu,Shuhan Fu,Lingfu Zhu,Wei Dang,Tingting Zhang
Oily sludge produced in the process of petroleum exploitation and utilization is a kind of hazardous waste that needs to be urgently dealt with in the petrochemical industry. The oil content of oily sludge is generally between 15–50% and has a great potential for oil resource utilization. However, its composition is complex, in which asphaltene is of high viscosity and difficult to separate. In this study, The oily sludge was extracted with toluene as solvent, supplemented by three kinds of ionic liquids (1-ethyl-3-methylimidazole tetrafluoroborate ([EMIM] [BF4]), 1-ethyl-3-methylimidazole trifluoro-acetate ([EMIM] [TA]), 1-ethyl-3-methylimidazole Dicyandiamide ([EMIM] [N(CN)2])) and three kinds of deep eutectic solutions (choline chloride/urea (ChCl/U), choline chloride / ethylene glycol (ChCl/EG), and choline chloride/malonic acid (ChCl/MA)). This experiment investigates the effect of physicochemical properties of the solvents on oil recovery and three machine learning methods (ridge regression, multilayer perceptron, and support vector regression) are used to predict the association between them. Depending on the linear correlation of variables, it is found that the conductivity of ionic liquid is the key characteristic affecting the extraction treatment in this system.Keywords:ionic liquid;deep eutectic solvent;oily sludge;extraction;machine learning
研究领域:
环境科学
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化学工程
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人工智能
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 23
·12542
·
IF 4.9
Yun Ma,Hui Liu,Liuli Zhu,Yi Xie,Chuanqi Ren,Xiaorong Mo,Xiaoying Liu,Chen Liang,Gang Deng,Shuangquan Yao,Chengrong Qin
The thermal washing of oily sludge using sodium persulfate (SD) assisted by sodium lignosulfonate surfactant has been demonstrated to be an effective method for oily sludge remediation. To further explore the underlying mechanisms of this process, a systematic study was conducted by simulating oily sludge systems consisting of saturated hydrocarbons (SaH), aromatics hydrocarbons (ArH), resins (Res), and asphaltenes (Asp). The effects of reaction conditions, such as pH, sodium lignosulfonate alkyl (LSA) concentration, SD concentration, and washing temperature, were analyzed. Furthermore, the oxidative kinetic mechanism during the reaction process was investigated. The results demonstrated that neither petroleum hydrocarbons nor SD underwent significant chemical transformations when exposed to LSA, while SD exhibited a marked oxidative degradation effect on all four types of hydrocarbons. Oxidation kinetics indicated that sodium hydroxide played a catalytic role, with SD being the main oxidant and particularly efficient in degrading Asp and Res. Meanwhile, LSA contributed to the removal of hydrocarbons by reducing the surface tension of the solution, enhancing solubilization. This study not only elucidates the central role of SD in the thermal washing process but also provides a solid theoretical foundation for the practical application of this technology in oily sludge treatment.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Xincheng Zhang,Juanjuan Yang,Changqing He,Ying Tian,Lin He,Hong Sui,Xingang Li
The economic and environmental treatment of oily sludges is always a challenge in industry. Herein, we propose an interfacial capture and demulsification hybrid process to deeply separate and recover the heavy oil (even over 97%) from the sludges with rejecting the encapsulated micro-/nano-mineral particles from the heavy oil phase in a low-carbon way (save energy over 69.3% compared with commercial pyrolysis). After testing over ten different oily sludges samples from petroleum industry, coal industry and steel industry, it is proved that this novel process possesses good universality, as well as high quality of products (oil, solids and water). A detailed mechanistic study by interfacial/surface characterizations approves the roles of interfacial capture of fine particles by dispersed water droplets and demulsification of asphaltenes-solids co-stabilized emulsions by a home-made oxygen-containing non-ionic demulsifier. Finally, a comprehensive evaluation has been made for this process, which demonstrates its excellent economy and environmental feasibility.
研究领域:
环境科学
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化学工程
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Yurou Guo,Peng Lv,Juan Li,Changqing He,Lin He,Hong Sui
Persulfate oxidants are widely used in soil remediation and wastewater treatment but perform poorly in degrading polycyclic aromatic hydrocarbons (PAHs), especially heavy fractions in solids. Herein, we propose the utilization of a green peroxymonosulfate-ferrate-FeS (PFI) oxidant as a promising process aid for remediating soils contaminated with heavy petroleum components, including asphaltenes and resins. The PFI oxidant could degrade heavy petroleum fractions because of dual activation of the peroxymonosulfate and ferrate by FeS at ambient conditions. Nevertheless, when dealing with soil with high oil content (>10%), the degradation efficiency remains limited (<30%) regardless of the quantity of oxidants employed. Surface elemental analysis shows that a coating of secondary products (Fe(OH) 3 , Fe 2 O 3 ) on the surface and in pores of the soil-pollutant matrix explains the failure of oxidation and inefficient use of oxidant. To address this issue, a strategy of pre-solvent extraction-oxidation hybrid process with sequent acidic washing is proposed, where dichloromethane serves as the solvent, and PFI acts as the oxidant. In this system over 90% of the oil could be recovered with an oxidation efficiency of 80% by alleviating the problem of iron oxide coating the matrix surface. The oxidant consumption is also reduced to 70 wt% of the sludge. The PFI oxidant is found to exhibit excellent universality in treating oily sludge with low petroleum content (<2%), reducing the petroleum content in the residue to less than 0.3 wt% (meeting the national standards). The degradation of low oil content sludge by the PFI oxidant followed pseudo first-order kinetics. These findings not only elucidate the failure of PFI oxidation for high oil content oily sludge and identify its potential engineering application range, but also offer a practical strategy for processing petroleum-contaminated soil with varying oil contents through wet oxidation.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yun Ma,Mingzhu Yao,Lu Liu,Chengrong Qin,Baicheng Qin,Ningkang Deng,Chen Liang,Shuangquan Yao
The separation of oil components from oily sludge is an important component of soil remediation and energy recovery. Therefore, establishing a green and efficient separation technology is of great significance. In this study, oily sludge was separated using sodium lignosulfonate (SL) treatment. The effects of temperature, SL concentration, rotate speed, time, and pH on the oil removal rate were studied. The optimal conditions were as follows: temperature, 30 °C; SL concentration, 2.0 g·L–1; rotate speed, 200 rpm; time, 60 min; and pH 11. The maximum oil removal rate was 83.21%. The physicochemical properties of oily sludge were analyzed. The soil was looser, and the contact angle (55°) of the soil surface was reduced. Alkanes, aldehydes, ketones, carbonic acids, benzene rings, and alicyclic ethers were removed. The result shows that the SL treatment removed a wider range of petroleum hydrocarbon and had a stronger oil removal capacity. It provides a new method for the green and efficient separation of oily sludge.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Ai-Yue Wang,Kai Sun,Liping Wu,Ping Wu,Wenchao Zeng,Zhongmin Tian,Qun-Xing Huang
Different biomass materials (walnut shell, coconut shell or cottonwood sawdust) were co-pyrolyzed with carbon-enriched oily sludge to produce aqueous phase sulfamethoxazole (SMZ) adsorption materials. The co-pyrolysis char was activated with K 2 CO 3 to modify its micro-structure and functional groups. Results show that ACs prepared from the mixture contained more mesopores than biomass-based ACs, more porous and higher yield than oily sludge-based ACs. One-step activation method was more attractive than two-step activation in larger specific surface area (up to almost 4 times), wider pore size distribution (2–3 nm), stronger SMZ adsorption ability (higher than 2 times). The maximum BET surface area was 1342 m 2 /g for the ACs prepared from the mixture of walnut shell and oily sludge by one-step activation and it had the maximum SMZ adsorption capacity up to 361.9 mg/g, which is higher than previous reported values. The capacity of SMZ adsorption of ACs was mainly attributed to pore size distribution, specific surface area and functional groups. Among them, the appropriate content of C O and C O functional groups, larger specific area and more pores range from 2 to 3 nm lead to higher adsorption capacity.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2020
·Vol. 43
·期 11
·2160-2166
·
IF 1.543
Shanshan Dai,Xiaojiang Li,Jihe Zhao,Hongsheng Lu
A green and effective extraction of oily sludge was completed by a hybrid process with tertiary amines (TA) and protonated tertiary amines (PTA), where PTA is the protonated state of TA. Compared with only TA, the crude oil recovery was improved by 3–5 % by the addition of PTA and less solid remained in the recovered crude oil. Additionally, the wettability improved with the absorption of positively charged ions of PTA on the sludge, and the interaction between heavy alkanes of crude oil and PTA promotes the detachment of crude oil from the sludge surface, enhancing the hydrophilicity of sludge. More importantly, the incomplete recovery of TA exactly takes the role of the PTA in the regenerated mixture, which can reduce the loss of solvent.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）