SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Qichen Shang,Yu Chang,Junjie Wang,Daiwei Gu,Jian Deng,Guangsheng Luo
Countercurrent extraction with extreme phase ratio widely exists in many fields. However, it remains a great challenge for its low efficiency because of poor dispersion and unstable two-phase flow. In this work, we take the extraction of H 2 O 2 from the working solution as an example and develop a novel intensification technology via integrating the annual rotating flow with micro-capillary jetting dispersion. The phase whose volume flow rate is much smaller is ejected into the continuous phase by micro-capillary jetting to form microdroplets. The annular rotating field is introduced to stabilize the flow and reduce the extraction resistance. The microdispersion, two-phase countercurrent flow, and extraction characteristics are systematically studied. The results show that three theoretical stages in 60 cm with an operation capacity of 43.6 m 3 /(m 2 ·h) are successfully achieved when the phase ratio exceeds 50. This new technology may become a general way for extraction intensification with the extreme phase ratio.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yinyin Zhang,Fangzhong Liu,Ting Song,Yong Pei,Xianyou Wang,Xiongwei Wu,Manjun Xiao,Qi Deng,Bei Long
The electrochemical performances of LiNi 0.5 Mn 1.5 O 4 (LNMO) materials are strongly correlated with the ratio of disordered to ordered phases. Nevertheless, there are few reports on the adjustment of ordered and disordered phase ratio. In this paper, the ratio of ordered to disordered phases in LNMO is successfully adjusted by using a quaternary molten salt, which is proven by XRD refinement, FT-IR, and XPS. Reductive quaternary molten salt and Co doping are favorable for Ni/Mn cation disorder, leading to the increased disordered phase. LNMO with an appropriate ratio of ordered to disordered phases can exhibit enhanced electronic/ionic transfer rate and structural stability, revealed by electrochemical tests and ex situ characterizations. Therefore, the optimized material delivers a reversible capacity of 121 mA h g −1 at 20 mA g −1 and a long cyclic life with 61 mA h g −1 at 1000 mA g −1 over 1200 cycles. The present work offers a new idea for achieving a regulated ratio of ordered to disordered phases in LNMO.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qichen Shang,Yu Chang,Junjie Wang,Daiwei Gu,Jian Deng,Chencan Du,Guangsheng Luo
Liquid-liquid extraction can be greatly intensified in microchannel devices. Unfortunately, countercurrent flow is hard to realize at microscale. Meanwhile the microdroplet extraction efficiency is still low when the phase ratio is high. Micro-capillary jetting as a new technology for microdispersion can produce microdroplets with narrow size distribution without the restriction of phase ratio. In this work, an integrated microsystem of the micro-capillary jetting for microdroplet generation with the liquid–liquid countercurrent flow in a millimeter column has been developed, and the countercurrent extraction based on microdroplet under high phase ratio was successfully realized. More than 3 theoretical stages within 40 cm were achieved under the phase ratio of 50 ∼ 90 for H 2 O 2 extraction. This paper systematically reports the microdispersion, flow characteristics and extraction performances of the microsystem. It means a lot for future intensification of the countercurrent extraction with high phase ratio.
研究领域:
化学工程
·
微流体技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yang Yang,Shaona Wang,Kanghuai Yang,Wenqing Xu,Xueqian Wang,Zanbu Geng,Guoping Liao,Ping Ning,Tingyu Zhu
Reducing the rich phase ratio is a key issue for developing the biphasic absorbents. In this study, it is found that the hydrophobic solvents (sulfolane and N, N-dimethylformamide) are beneficial for reducing rich phase volume, while hydrophilic solvents (n-propanol, Polyethylene glycol) inhibit the phase splitting. Sulfolane is the optimal solvent, wherein, the rich phase ratio is greatly reduced from 79 % to 37 %. The CO 2 absorption capacity in the rich phase increases from 2.50 M to 4.25 M. The kinetic studies show that the total mass transfer coefficient is increased by 1.96 times with sulfolane addition. The regeneration energy consumption of the developed absorbent is only 1.85 GJ/t-CO 2 , which is 53.6 % less than MEA. The results can provide a theoretical reference for developing high-performing biphasic absorbents.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2016
·Vol. 31
·期 19
·3036-3043
·
IF 1.579
Ammara Riaz,Hejinyan Qi,Yuan Fang,Jianfeng Xu,Chunmei Zhou,Zhengguo Jin,Zhanglian Hong,Mingjia Zhi,Yi Liu
TiO2 nanofibers (TNFs) with different anatase/rutile phase ratios were fabricated using electrospinning technique followed by the annealing at different temperatures. The effect of annealing temperatures on their morphology, structural, and optical properties and photocatalytic activity was investigated. The photocatalytic performance of TNFs was evaluated by degradation of methyl orange (MO) in aqueous solution under the irradiation of simulated solar light. Annealing temperature significantly influenced photocatalytic degradation of MO due to the incorporation of rutile phase which suppresses recombination of photoactivated electron and hole pairs. Turnover frequency (TOF) of MO degradation was introduced to describe the intrinsic activity of TNFs. TNFs acquired best anatase/rutile phase ratio (A/R = 83/17) when annealed at 650 °C, resulting in highest TOF value 2394 h−1, two times higher as compared to P25 with similar anatase/rutile phase ratio (A/R = 85/15). Appropriate crystalline structure could be the reason for good photocatalytic activity as well as intrinsic activity of TNFs.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 36
·17120-17128
·
IF 3.3
Tangzhe Cao,Huaming Xie,Ying Lei,Wei Zou,Hui Li,Kang Yang,Tong Zan,Liming Li,Yongxian Fang
Polyvinylidene fluoride (PVDF) binder is an important part of lithium-ion batteries, where a slight structural difference can significantly affect the capacitance and service life of batteries. Herein, ATR-FTIR technology and a rheological test were employed to investigate the crystal forms and rheological behavior of three different PVDF binders, respectively. The results showed that PVDF-CG has low molecular weight, high α/β phase ratio, strong adhesive action and stripping strength, which are closely associated with the durability and electrochemical properties of LiNi0.5Co0.2Mn0.3O2 single-crystal (denoted as SC) materials. The SCs with PVDF-CG binder exhibited a capacity retention of 93.44% after 100 cycles at a rate of 1C and high rate performance (92 mA h g−1 at 10C), which was higher than that of PVDF-HSV900 (90.31%, 86 mA h g−1 at 10C) and PVDF-Solvay 5130 (90.52%, 72 mA h g−1 at 10C). The XPS and HR-TEM analysis showed that the cycled SCs bonded with HSV900 and Solvay 5130 as binders suffered from severe interface structural degradation, while SCs with PVDF-CG maintained a well-layered structure and the formation of a surface NiO-like rock-salt phase was greatly inhibited. This work demonstrated that the capacity, rate capability and interface stability of SC cathodes are significantly affected by the mode and strength of the adhesion and stripping strength of PVDF binders, which are closely associated with α/β phase ratios, providing a useful reference for the development of efficient binders.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Chencan Du,Peicheng Wang,Yunpeng Hu,Jisong Zhang,Guangsheng Luo
The mass transfer of cyclohexanone oxime (CHO) from n-octane (continuous phase) to H2SO4 (dispersed phase) was enhanced in milliscale packed beds under large phase ratios. The holdups of two phases were determined, and the effects of structure and operating parameters on the overall mass transfer coefficient of the organic phase (K0a) were also investigated, including placement mode, surface property, size of particle and bed, flow rate and phase ratio, and CHO concentration. Different flow regimes were found in different placement modes and surface properties. Compared with tubes, packed beds showed 1 order of magnitude increase of K0a. A prediction model for K0a was proposed and showed good agreement with the experimental results. Pressure drop and energy dissipation were further measured to access the mixing efficiency. These results are therefore expected to contribute to the novel process of the caprolactam industry and expand the applications of microflow technology.
研究领域:
化学工程
·
传质
·
过程工程
·
微流控
✓ 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）