PETROLEUM SCIENCE AND TECHNOLOGY
·
2021
·
IF 1.268
Yongtao Sun,Zhaomin Li,Yubao Sun,ShaoHua Wang
This paper reports the synthesis of AEC-9Na and its effects as an emulsifier on viscosity reduction of heavy oils. Williamson reaction was employed to obtain the emulsifier and its thermal stability was evaluated. The results showed that AEC-9Na can withstand a temperature of 300 °C, the viscosity reduction rate can reach greater than 99%, and it has high stability to calcium and magnesium salts. The interfacial tension of AEC-9Na on heavy oil reached 10−1 level. Compared with the steam flooding, the flooding efficiency with the addition of 1.0% AEC-9Na was increased by 4.8%. The samples were examined microscopically and self-emulsification occurred.
研究领域:
石油工程
·
化学工程
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产品关联
DOI
高影响因子
Microbial Cell Factories
·
2019
·Vol. 18
·期 1
·1-10
·
IF 4.402
Tao Weiyi,Lin Junzhang,Wang Weidong,Huang He,Li Shuang
Background Bioemulsifiers are surface-active compounds, which exhibit advantages including low toxicity, higher biodegradability and biocompatibility over synthetic chemical surfactants. Despite their potential benefits, some obstacles impede the practical applications of bioemulsifiers, including low yields and high purification costs. Here, we aimed to exploit a novel protein bioemulsifier with efficient emulsifying activity and low-production cost, as well as proposed a design-bioemulsifier system that meets different requirements of industrial emulsification in the most economical way. Results The esterase AXE was first reported for its efficient emulsifying activity and had been studied for possible application as a protein bioemulsifier. AXE showed an excellent emulsification effect with different hydrophobic substrates, especially short-chain aliphatic and benzene derivatives, as well as excellent stability under extreme conditions such as high temperature (85 °C) and acidic conditions. AXE also exhibited good stability over a range of NaCl, MgSO 4 , and CaCl 2 concentrations from 0 to 1000 mM, and the emulsifying activity even showed a slight increase at salt concentrations over 500 mM. A design-bioemulsifier system was proposed that uses AXE in combination with a variety of polysaccharides to form efficient bioemulsifier, which enhanced the emulsifying activity and further lowered the concentration of AXE needed in the complex. Conclusions AXE showed a great application potential as a novel bioemulsifier with excellent emulsifying ability. The AXE-based-designer bioemulsifier could be obtained in the most economical way and open broad new fields for low-cost, environmentally friendly bioemulsifiers.
研究领域:
生物化学
·
微生物学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Journal of CO2 Utilization
·
2018
·
IF 5.503
Shuai Wang,Dongfang Liu,Jihe Zhao,Xiaojiang Li,Daixue Xu,Yuan Gu,Hongsheng Lu
In this paper, a practical and environmental friendly method was successfully developed by using CO 2 -Triggered switchable water additive to reversibly emulsify and demulsify diesel, aims to provide guidance for recovering oil substances in waste oil-based drill cuttings. In this new method, N, N, N', N'-tetramethyl-1, 6-hexanediamine(TMHDA) was a switchable water additive whose aqueous solution can switch the ionic strength by addition and removal CO 2 . Then it can be used to separate diesel through reversibly emulsification and demulsification. The nuclear magnetic resonance hydrogen spectrum ( 1 H NMR) and conductivity demonstrated TMHDA have better switching performance. Then, diesel/naphthenic acid mixtures have been used for modeling the application of recovering oil substances in waste oil-based drill cuttings. When the acid value≥1.76mgKOH/g (the oil and TMHDA solution were 5 mL), diesel can be emulsified. The material produced by TMHDA and naphthenic acid have a strong surface activity so that the oil/water interfacial tension was less than 0.1 mN·m −1 . The demulsification performance was illustrated by change of the ionic strength, pH and the content of oil in the aqueous phase during the breaking process. Brief provided two optimization strategies of recycling of TMHDA additive. Finally, the possible mechanism of the new method was discussed.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qiang Zou,Linghui Luo,Shuaiqian Wang,Yudie Liu,Yuyou Chen,Yuhan Zheng,Guilian Ran,Guangyi Wang,Qiang Zhang,Dayu Liu
This study examined the emulsification of lard with different concentrations of octenyl succinic acid starch (OSA-S) and whey isolate protein (WPI) and explored the interaction mechanism of the particles at the molecular level. Results showed that the emulsification activity index, emulsion stability index and absolute value of zeta potential all increased with increasing OSA-S to WPI ratio, peaking at 3.40 m²/g, 223.68 min, and 36.98 ± 0.46 mV at 5:1. OSA-S reduced the droplet diameter (532.34 ± 9.05 nm) and increased the oil–water interface thickness according to microscopic observation. The rheological results showed that OSA-S increased the elastic (G′) and viscous (G″) moduli and viscosity of the emulsions. The molecular simulation results confirmed that -OH, -COOH and C-O-C are mainly involved in the hydrogen bonding, hydrophobic and electrostatic forces between OSA-S and WPI. The molecular dynamics results showed that the β-lactoglobulin (β-LG)/OSA-S complex had lower binding energy (-46.941 kJ/mol) and RMSD (0.242 Å) with higher Rg (1.956 Å) as compared to β-LG. This study expanded the deep processing of lard industry and more applications of OSA-S.
研究领域:
食品科学
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分子生物学
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DOI
高影响因子
TENSIDE SURFACTANTS DETERGENTS
·
2021
·Vol. 57
·期 6
·451-459
·
IF 1.049
Liujun Pei,Yuni Luo,Xiaomin Gu,Jiping Wang
Hemp seed oil has good sun protection, repair, anti-allergy and anti-aging effects, and is a high quality raw material for the production of skincare products. However, the influence of surfactants and co-surfactants on the emulsification of hemp seed oil in aqueous solution has been rarely investigated. In this investigation, the surfactants and co-surfactants which were suitable for hemp seed oil emulsion were optimized, and the factors which influence the particle size and the stability of the emulsion were studied. Moreover, the application of hemp seed emulsion in different cosmetics was also further investigated. It was found that sorbitan monooleate/polysorbate-80 and glyceryl stearate were the most effective surfactant and co-surfactant in the emulsification of hemp seed oil. After three months the hemp seed oil emulsion had no layered separation and remained homogeneous at -48C, 258C and 408C. The water-resistant sunscreens and the hemp seed oil sunscreens were homogeneous pastes, had a soft texture and were stable at higher temperatures. No microorganisms were detected in these cosmetic creams. Therefore, hemp seed oil is suitable for sunscreen cosmetic materials.
研究领域:
化妆品科学
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化学工程
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生物学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiu-ning Yao,Rui-ling Dong,Yu-cong Li,Ao-jing Lv,Li-ting Zeng,Xue-qing Li,Zhou Lin,Jun Qi,Chun-hui Zhang,Guo-yuan Xiong,Qing-yong Zhang
The effects of pH-shifting treatments (pH 3, 5, 7, 9, and 11) on the stability of gelatin emulsions made by low-energy stirring were investigated. pH-shifting treatments significantly enhanced the ESI and EAI of the emulsion ( P < 0.05) and reduced its particle size ( P < 0.05) under low-energy emulsifying conditions. The pH 11 – 7 shifting treatment significantly increased the degree of depolymerization and the level of ordered structure of gelatin ( P < 0.05). These transformations resulted in a significant increase in the exposure of hydrophobic and negatively charged residues ( P < 0.05) on the surface of gelatin, facilitating a faster adsorption rate of gelatin onto the oil-water interface as well as an increase in the amount of gelatin adsorbed at the interface. Moreover, the alkali-shifting treatment promoted the formation of a thin viscoelastic interfacial film, which contributed to the enhanced stability of the emulsion.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Liang Zhang,Ting Xiong,Xian-Fen Wang,Dong-Ling Chen,Xu-Dong He,Chen Zhang,Chunsen Wu,Qian Li,Xiangli Ding,Jian-Ya Qian
Quinoa starch was developed as a new kind of Pickering emulsifier by enzymatic modification. The morphological structure, crystalline structure, lamellar structure, fractal structure, particle size distribution, contact angle, emulsion index (EI), and emulsion micromorphology were studied to explore the relationship between structure characteristics, hydrophilic property, and emulsifying properties of enzymatically modified (EM) quinoa starches. With the increasing enzymatic hydrolysis time in the test range of 0–9 h, particle size of EM quinoa starch decreased, and the broken starch and contact angle of EM quinoa starch increased; the EI value of emulsions with EM quinoa starch increased, and the oil droplet size of emulsions with EM quinoa starch decreased. It suggested that both the smallest particle size and the closest extent of the contact angle to 90° derived the best emulsifying property of EM-9. The EM quinoa starch had higher emulsifying capacity at higher oil volume fraction (Φ) (50%) than at lower Φ (20%), proving that the EM starch has potential to be used as Pickering emulsifiers in higher oil products, such as salad dressing.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Lingrui Chen,Wen Xu,Ji’an He,Xuemin Yan,Lu Lai,Weichu Yu,Yuanzhu Mi,Huan Li
Traditional demulsifiers are commonly produced using raw materials like ethylene oxide and propylene oxide, which deplete significant petroleum resources and involve hazardous and complex manufacturing processes. In this investigation, a hydrophobically modified chitosan (HMC) was synthesized by grafting dodecyl diethanolamine onto natural chitosan to facilitate the separation of O/W emulsions. Characterization of HMC was conducted using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance hydrogen spectroscopy ( 1 H NMR) and scanning electron microscopy (SEM). The demulsification efficacy of HMC was assessed through a bottle test in an O/W emulsion containing 0.2 % crude oil. Results showed that at a HMC dosage of 40 mg/L, the light transmission (W T ) and oil removal efficiency (W R ) of the resulted water phase were 93.4 ± 0.8 % and 99.8 ± 0.1 %, respectively. Furthermore, the competitive adsorption between natural surfactants and HMC at the interface was investigated using interfacial tension (IFT), three-phase contact angle (CA), droplet coalescence time (CTA), and interfacial film substitution. A potential demulsifying mechanism was also proposed, emphasizing HMC’s hydrophilic core and dispersed hydrophobic alkyl chains that enable rapid diffusion to the oil–water interface, replacing interfacial active components to induce demulsification by destabilizing the composite film. The advantages of HMC demulsifier over commercial demulsifiers lie in its superior environmental benefits, diverse range of sources, higher efficiency, and outstanding demulsification performance.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Tianhao Zhang,Junjie Fan,Wenxiu Qiu,Xinyu Yuan,Jianwen Hu,Haotian Gao,Wenqing Xie,Chunling Li,Shuangqing Sun,Songqing Hu
This study reports the development of two pH-responsive Pickering emulsifiers utilizing carbon dots (CDs) as the core component. Both emulsifiers were fabricated via a post-synthetic method, involving the grafting of poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) onto the surface of CDs to create CD-based emulsifier. Notably, despite employing an identical synthetic route, the two CD-based emulsifiers exhibit markedly distinct pH-responsive behaviors. The findings demonstrate that both CD-based emulsifiers effectively stabilize Pickering emulsions, and their emulsification and demulsification behaviors can be precisely controlled by adjusting the pH, displaying excellent reproducibility in their pH-responsive performance. To elucidate the underlying reason for this differing pH-responsiveness, the concept of hydrophilic-lipophilic balance (HLB) was introduced. The analysis of the HLB values of the two CD-based emulsifiers revealed that their hydrophilic-lipophilic properties exhibit opposite trends under differing pH conditions, contributing to their contrasting pH-responsive behaviors. This study not only lays a fundamental basis foundation and offers guidance for further research and applications of CD-based smart-responsive emulsifiers but also presents novel insights into design and development of more intelligent and functional emulsifying agents. Moreover, owing to the enhanced fluorescence characteristics of CDs, these pH-responsive emulsifiers hold significant potential for interdisciplinary applications, such as oil and gas exploration and fluorescent labelling.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2022
·
IF 3.985
Tan Wei,Zhu Songxiang,Kong Lingyun,Peng Yi,Xu Lei,Fu Yaoguo
Efficient demulsification is vital for the application of emulsified asphalt in road construction. In this paper, the effects of the main chemical components of the aggregates (CaCO3, MgO, Fe2O3, SiO2, Al2O3) on the demulsification process of emulsified asphalt were studied by experiment and simulation using a Gompertz model. The findings indicate that the surface energy, specific surface area, and pH of the chemical components of the aggregates are the most important factors influencing the demulsification speed of the emulsified asphalt. The choice of the aggregate’s main chemical components can accelerate demulsification speed, with the acceleration effect of Al2O3 on anionic (SDBS) emulsified asphalt and MgO on cationic (STAC) emulsified asphalt both reaching 60%. The fit between the Gompertz model and the experimental viscosity curve is greater than 0.93, which verifies the utility of using the Gompertz approach for studying emulsified asphalt-aggregate mortar viscosity changes. A demulsification evaluation function φ(t) of emulsified asphalt is proposed based on the parameters of the Gompertz model. When φ(t) is close to 1, the emulsified asphalt-aggregate mortar is fully demulsified, and setting φ(t)=1 allows the demulsification time of the emulsified asphalt-aggregate mortar to be calculated from the Gompertz model parameters.
研究领域:
材料科学
·
土木工程
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Liwei Shen,Tianqi Liu,Huan Li,Shuman Li,Zhijie Hu,Xuebin Jiang,Hanjun Liu,Zejun Zhang,Yuanzhu Mi,Weichu Yu
The separation of oil–water emulsions is a pressing and crucial task due to the significant impact on transportation costs and pipeline corrosion. Currently, commercially available demulsifiers mainly utilize ethylene oxide and propylene oxide as raw materials. However, these demulsifiers involve complex and hazardous production processes, exhibit low demulsification efficiency (DE), and require high temperatures exceeding 60 °C. To address these challenges, this study presents a two-step synthesis method for producing a demulsifier (PDB-C6) that resembles a jellyfish. This demulsifier demonstrates a high DE in demulsification processes, operating at lower temperatures and shorter timeframes. Its hydrophilic head can locate water droplets in the emulsions, while the four hydrophobic tails can assist its rapid migration in the oil phase towards the oil–water interface for demulsification. The demulsifying performance was investigated in two W/O emulsions with different oil contents. Bottle tests showed that the DE of PDB-C6 in a 30% oil content W/O emulsion reached 100% with the dosage of 300 mg/L at 40 °C for 2 h, while the dosage of 400 mg/L for 3 h also achieved 100% of DE in a 70% oil content W/O emulsion. In addition, PDB-C6 had excellent demulsification performance in both high salinity and a wide pH range (2–12). Given its low demulsifier amount, low demulsification temperature, short demulsification time and high DE, PDB-C6 shows promise for wide-ranging applications in the petroleum industry. The impacts of PDB-C6 on the oil–water interface were systematically investigated and its possible demulsification mechanism in W/O emulsions was explored in detail. The findings revealed that PDB-C6 had excellent demulsification performance by rapidly migrating to the oil–water interface where it replaced natural surfactant and formed an unstable composite membrane, ultimately reducing the stability of the emulsion and leading to demulsification.
研究领域:
化学工程
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2024
·
IF 7
Wanjun Xu,Yulong Bao,Yue Zhou,Hui Hong,Ruichang Gao
This study aimed to investigate the effect of oxidation on fish gelatin and its emulsifying properties. Fish gelatin was oxidized with varying concentrations of H 2 O 2 (0–30 mM). Increased concentrations of the oxidant led to a decrease in amino acids in the gelatin, including glycine, lysine, and arginine. Additionally, the relative content of ordered secondary structure and triple helix fractions decreased. Zeta potential decreased, while particle size, surface hydrophobicity, and water contact angle increased. Regarding emulsifying behavior, oxidation promoted the adsorption of gelatin to the oil–water interface and reduced interfacial tension. With increased degrees of oxidation, the zeta potential and size of the emulsion droplets decreased. The oxidized gelatin exhibited better emulsifying activity but worse emulsifying stability. Based on these results, a mechanism for how oxidation affects the emulsifying properties of gelatin was proposed: the increase in gelatin’s hydrophobicity and the decrease in triple helix structure induced by oxidation reduced the interfacial tension at the oil–water interface. This promoted protein adsorption at the oil–water interface, allowing the formation of smaller oil droplets and enhancing gelatin’s emulsifying activity. However, the decrease in electrostatic repulsion between emulsion droplets and the decrease in solution viscosity increased the flocculation and aggregation of oil droplets, ultimately weakening the emulsifying stability of gelatin.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）