JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Rui-Zhi Cui,Yong-Ming Zhang,Ya-Ping Dong,Wu Li
In this paper, the solubility of unreported systems LiBr–NaBr–Li 2 SO 4 –Na 2 SO 4 –H 2 O, LiBr–KBr–Li 2 SO 4 –K 2 SO 4 –H 2 O and the subsystem LiBr–Li 2 SO 4 –H 2 O was measured by isothermal dissolution method at 298.15 K. Three phase diagrams are also given. It was found that the diagram of LiBr–Li 2 SO 4 –H 2 O system has only one invariant point of LiBr·2H 2 O + Li 2 SO 4 ·H 2 O. The phase diagram of LiBr–NaBr–Li 2 SO 4 –Na 2 SO 4 –H 2 O system includes eight crystallization regions LiBr·2H 2 O, Li 2 SO 4 ·H 2 O, NaBr·2H 2 O, NaBr, Na 2 SO 4 ·10H 2 O, Na 2 SO 4 , Li 2 SO 4 ·3Na 2 SO 4 ·12H 2 O, and Li 2 SO 4 ·Na 2 SO 4 . Five crystallization regions corresponded to two single salts KBr and K 2 SO 4 , two hydrate salts Li 2 SO 4 ·H 2 O and LiBr·2H 2 O, and one double salt Li 2 SO 4 ·K 2 SO 4 in LiBr–KBr–Li 2 SO 4 –K 2 SO 4 –H 2 O system. The relevant Pitzer parameter was obtained and the result predicted by Pitzer model was consistent with the experimental values.
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Xiao-Feng Guo,Shi-Hua Sang,Chao Ye
The underground brines in the Sichuan basin of China are rich in many valuable components, such as Li+, K+, Sr2+, Br–, and others. In view of comprehensive utilization of the underground brines, the stable solid–liquid equilibria of the quaternary systems LiBr–NaBr–KBr–H2O and LiBr–KBr–SrBr2–H2O at 308.15 K were measured by the isothermal dissolution equilibrium method. The results show that both phase diagrams of the quaternary systems listed above are hydrate-type. Both equilibrium phase diagrams are composed of two invariant points, five univariant curves and four crystallization fields. The equilibrium solid phases in the first quaternary system are LiBr·2H2O, NaBr·2H2O, NaBr, and KBr, respectively, and those in the second quaternary system are LiBr·2H2O, SrBr2·6H2O, SrBr2·2H2O, and KBr. In both phase diagrams, the crystallization field of KBr is the largest, while that of LiBr·2H2O is the smallest. The results indicate that KBr is the easiest to be separated from the saturated solution in the two quaternary systems. Furthermore, the comparison of phase equilibria of the quaternary systems and its ternary subsystems at different temperatures is presented and discussed in detail.
研究领域:
化学工程
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物理化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Pei-Huan Jiang,Chun-Xia He,Shi-Hua Sang,Xing-Liu,Lan-Rong Zhao
The solid–liquid equilibria in the ternary system LiBr–SrBr2–H2O at 273.15, 308.15, and 323.15 K were studied by isothermal dissolution equilibrium method in this work. At three different temperatures, the ternary system LiBr–SrBr2–H2O belongs to hydrate type I saturation. The phase diagram at 273.15 K includes one cosaturation point, two univariant curves, and two crystallization zones corresponding to LiBr·2H2O and SrBr2·6H2O. The other two phase diagrams contain two cosaturation points, three univariant curves, and three crystallization fields corresponding to LiBr·2H2O, SrBr2·2H2O, and SrBr2·6H2O at 308.15 K and LiBr·H2O, SrBr2·2H2O, and SrBr2·6H2O at 323.15 K, respectively. Lithium bromide has an obvious salting-out effect on strontium bromide. The crystallization area of lithium bromide hydrate is the smallest, and lithium bromide is difficult to crystallize out of the solution at different temperatures.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Guopeng Chen,Junsheng Yuan,Zilong Liu,Ming Lei,Bin Li
The solid–liquid equilibria in the LiBr–MgBr2–KBr–H2O system was measured, along with its two subsystems, LiBr–MgBr2–H2O and MgBr2–KBr–H2O, at 308.15 and 288.15 K using the isothermal dissolution equilibrium method. The stable phase diagrams of the three systems at 308.15 and 288.15 K were plotted. For the ternary LiBr–MgBr2–H2O system, two univariant curves, one ternary invariant point, and two crystallization fields, the fields being MgBr2·6H2O and LiBr·2H2O, were identified. The ternary system MgBr2–KBr–H2O contained three univariant curves, two ternary invariant points, and three crystallization fields corresponding to KBr, KBr·MgBr2·6H2O, and MgBr2·6H2O. From the stable phase diagram of the quaternary system, five univariant curves, four crystallization fields, and two invariant points were observed. The corresponding solids of the four crystallization fields were KBr, LiBr·2H2O, KBr·MgBr2·6H2O, and MgBr2·6H2O. The quaternary phase diagrams at 288.15 and 308.15 K had similar shapes, and the shapes of each crystallization field were identical. The crystallization field of KBr was larger than the other crystallization fields. With an increase in temperature, the crystallization field of KBr became smaller and that of LiBr became larger.
研究领域:
化学热力学
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无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Chao Ye,Zhong-Zhong Wu,Shi-Hua Sang,Xiao-Yun Qi,Xing Liu
The solid–liquid phase equilibria of the ternary system KBr–LiBr–H2O at 273 and 308 K were determined by the isothermal dissolution equilibrium method. On the basis of the obtained experimental data, the stable phase diagrams of ternary system KBr–LiBr–H2O at 273 and 308 K were plotted, respectively. The results show that the ternary system is a simple cosaturated type at two different temperatures, and there is neither a solid solution nor a double salt in the system. Both of the phase diagrams include one invariant point, two univariant curves, and two crystalline regions (where the solids are LiBr·2H2O and KBr, respectively). The crystalline area of KBr is much larger than that of LiBr·2H2O, indicating that the solubility of KBr is much smaller than that of LiBr in the ternary system. The mass fraction of KBr in the equilibrium liquid phase is obviously reduced, which indicates that LiBr has a strong salting-out effect on KBr.
研究领域:
化学热力学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Chang-Wei Peng,Rui-Zhi Cui,Shi-Hua Sang,Hong-Bao Ren
According to the composition characteristics of mineral elements in underground brine in the Sichuan basin of China, the complete phase equilibria and phase diagram of the quinary system LiBr–NaBr–KBr–MgBr2–H2O were studied at 298.15 K. Using the experimentally determined solubilities and equilibrium solids, the spatial stereo phase diagram of the quinary system, the dry base projection phase diagrams of the saturated surfaces of the four salts MgBr2·6H2O, KBr, LiBr·2H2O, and NaBr·2H2O, and the corresponding water content diagrams were plotted, respectively. The experimental results show that at 298.15 K, in addition to the four original components, the anhydrous salt NaBr and the double salt KBr·MgBr2·6H2O are formed. The phase diagram of the quinary system at 298.15 K contains 10 univariate curves, three invariant points, and six equilibrium solid-phase crystallization regions (KBr crystallization region, NaBr crystallization region, NaBr·2H2O crystallization region, MgBr2·6H2O crystallization region, LiBr·2H2O crystallization region, KBr·MgBr2·6H2O crystallization region). When MgBr2·6H2O or KBr is saturated, LiBr has a strong salting-out effect on KBr, NaBr, or MgBr2 and NaBr, while when LiBr·2H2O is saturated, MgBr2 has a salting-out effect on KBr and NaBr. All four saturated projection surfaces have MgBr2·6H2O, and NaBr is generated. These phase equilibrium data can provide a theoretical basis to guide underground brine mining and extract useful components.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOMASS & BIOENERGY
·
2023
·
IF 6
Lihe Zhu,Xueting Shao,Xuejun Pan,Zhong Sun,Xiangyu Li,Xixin Duan,Junyou Shi
Catalytic conversion of waste biomass to furfural (FF) is an important valorization of lignocellulose . Heteropolyacid catalysts were designed for efficient aqueous-phase dehydration of saccharides by supporting phosphotungstic acid (H 3 PW 12 O 40 , abbreviated as PW 12 ) on H-ZSM-5 zeolite at different loadings (xPW 12 /ZSM-5, x = 10%, 20%, 30%, 40%, 50%). The PW 12 /ZSM-5 was used in the one-pot conversion of biomass (xylose, xylan , and corn stover) to FF in LiBr aqueous solution. The low PW 12 loading catalyst (10%PW 12 /ZSM-5) could efficiently convert biomass to FF with the yields of 73.3% (xylose) and 75.1% (xylan) at moderate temperature (130 °C), respectively. The PW 12 loading and acid sites distribution were crucial to the catalytic performance. Moreover, LiBr enhanced the yield of FF because of its Lewis acidity. The PW 12 /ZSM-5 based solid polyacid was a promising catalyst for the efficient FF production from biomass with high yield and easy separation.
研究领域:
生物化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Zhemin Li,Dewei Xiao,Zihan Li,Zhenming Xu,Hui Dou,Xiaogang Zhang
The formidable challenge of supercapacitors (SCs) is to achieve both high energy density and high power density simultaneously. Although the utilization of porous carbon materials for physical adsorption in electrochemical double-layer capacitors (EDLCs) applications exhibits promising prospects, attaining exceptional performance necessitates additional methodologies. Here, we propose an effective strategy for formulating redox electrolytes through the incorporation of organic solvents and LiBr into 1-ethyl-3-methylimidazole tetrafluoroborate (EMIMBF 4 ) electrolytes. Within this formulation, LiBr serves as a redox mediator, contributing Br − /Br 3 − redox pairs to the system. The incorporation of EMIMBF 4 -LiBr-DMSO in brominated redox EDLCs led to a significant enhancement in specific capacitance, reaching up to 39.72 F g −1 , representing a remarkable increase of 159 % compared to EDLCs without any redox media. This configuration achieved a high power density of 496.6 W kg −1 while maintaining an energy density of 34.48 Wh kg −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Runzhu Gong,Chao Liu,Meiyan Wu,Rui Tian,Guang Yu,Xitao Luo,Bin Li,Feng Peng,Yanjun Tang
Renewable hemicellulose with a unique structure exhibits a wide range of potential applications. However, it has been a formidable challenge to isolate hemicellulose with an intact structure from lignocellulosic materials. In this study, LiBr·3H2O (LBTH) was used as a green solvent for the effective fractionation of hemicellulose from bleached hardwood kraft pulp (BHKP) under mild conditions (25–85 °C). It was found that hemicellulose in BHKP can be dissolved in LBTH with ease and high selectivity owing to the breaking of hydrogen bonds between hemicellulose and cellulose, and the dissolved hemicellulose can be regenerated with a high degree of polymerization (DP) in the range of 240–264 using ethanol precipitation. The highest removal rate of hemicellulose from BHKP was as high as 95.2%, and the corresponding yield of pure hemicellulose reached 84.3%. Moreover, simultaneously obtained undissolved cellulose pulp through LBTH treatment had a high content of α-cellulose (96.7%), high DP (880), and trace levels of Fe (2 ppm), which met the standard requirement for dissolving pulp for the production of lyocell. In addition, LBTH can be easily recycled to guarantee a green and sustainable process. This work provides a new approach for highly selective fractionation of hemicellulose and cellulose from commercial BHKP based on an efficient and environmentally friendly LBTH treatment, which could be very promising for better valorization of hemicellulose and cellulose in many advanced applications.
研究领域:
林业科学
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材料科学
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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2020
·Vol. 16
·期 2
·e2595
·
IF 1.06
Xiao-Yun Qi,Chun-Xia He,Shi-Hua Sang,Jia Liu,Yun-Yun Gao
The solubilities of the LiBr−NaBr−KBr−H 2 O system and its subsystems LiBr−NaBr−H 2 O and LiBr−KBr−H 2 O were investigated at 288.15 K by the isothermal dissolution equilibrium method, and the corresponding phase diagrams were plotted, respectively. In the three systems, neither solid solution nor double salt was found. For the first subsystem LiBr−NaBr−H 2 O, there are two invariant points, three dissolution equilibrium curves, and three crystallization regions, which are LiBr·2H 2 O, NaBr·2H 2 O, and NaBr. An invariant point, two dissolution equilibrium curves, and two crystallization regions, which are LiBr·2H 2 O and KBr, constitute the stable phase diagram of the second subsystem LiBr−KBr−H 2 O. The phase diagram of the quaternary system LiBr−NaBr−KBr−H 2 O consists of two invariant points, five solubility curves, and four regions in which are LiBr·2H 2 O, NaBr, NaBr·2H 2 O, and KBr.
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Refrigeration
·
2021
·
IF 3.629
Zhenghao Jin,Shuhong Li,Runfa Zhou,Mengkai Xu,Weixue Jiang,Kai Du
The newly NH 3 – H 2 O – LiBr working fluid can decrease the power wasted in the generator, thus improves the COP of the ammonia absorption refrigeration system. But the applying of NH 3 – H 2 O – LiBr working fluid decreases the ammonia absorption efficiency, so the COP of the system is still unsatisfactory. To further enhance the COP of the NH 3 – H 2 O - LiBr absorption refrigeration system, TiO 2 nanoparticles are added to the NH 3 – H 2 O - LiBr working fluid in this study. And the effects of TiO 2 nanoparticles concentration on the performances of the generator, absorber, evaporator, condenser, and solution heat exchanger are tested in an ARS experimental system. The experimental results indicate that the addition of TiO 2 nanoparticles increases the P g , P e , P a , and P c , meaning that the value of ammonia produced in the generator increases. Therefore, the COP and iCOP of the system are improved by adding TiO 2 nanoparticles, and the COP is maximum improved by 18.96% compared with the ammonia-water absorption refrigeration system. When the x TiO2 is increased from 0.3% to 0.5%, the increase rate of the COP decreases because the newly added nanoparticles do not disperse well. So 0.3% is a better choice for the TiO 2 nanoparticles concentration when comprehensively considering the dispersion stability of nanoparticles and the COP.
研究领域:
工程热物理
·
制冷技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Rui-Zhi Cui,Wu Li,Ya-Ping Dong,Jun Li
The solubilities in the thermodynamic phase equilibria of the LiBr–NaBr–KBr–H2O system and its two subsystems LiBr–NaBr–H2O and LiBr–KBr–H2O at 298.15 K were investigated experimentally by the isothermal solution equilibrium method. Relevant stable-phase diagrams were plotted based on the experimental results. Using Pitzer’s solution model, nonreported mixing parameters ΨLi,Na,Br and ΨLi,K,Br were acquired and the solubilities of three systems were also predicted at 298.15 K. The results show that good agreement was obtained between calculated and experimental values.
研究领域:
物理化学
·
热力学
✓ 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）