FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Ye Yuan,Yixin Leng,Hui Shao,Chunxiang Huang,Kai Shan
The solubility of dl -malic acid in water, ethanol and ethanol + water mixtures was investigated by a static analytical technique using the acid–base titration method at temperatures ranging from 298.15 to 333.15 K. The experimental results indicated that the solubility of dl -malic acid in the binary solvent mixtures increases with increasing temperature and decreases with increasing mass fraction of ethanol. The measured solid–liquid equilibrium (SLE) data were correlated by the modified Apelblat, λh and van’t Hoff equations. The calculated solubility demonstrated good agreement with the experimental data. It was found that the modified Apelblat equation could give the best correlation results, and subsequently used to derive the standard enthalpy, entropy and Gibbs energy change of solution of dl -malic acid in ethanol + water binary mixtures.
研究领域:
化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2019
·Vol. 92
·期 13
·2710-2717
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IF 0.581
Huang Chunxiang,Yun Fang,Yongmei Xia,Jun Wang,Ye Yuan,Hang Liu,Yixin Leng
Abstract The solubility of DL-malic acid in methanol, ethanol, propanol, butanol, ethyl acetate and acetonitrile in the temperature range 283–318 K was measured by acid–base titration method. The solubility of DL-malic acid increased with elevating temperature. The solubility data were correlated by the modified Apelblat, Buchowski–Książczak, Van’t Hoff, Wilson, and non-random two-liquid equations. The calculation results showed that these equations provide good prediction with the acceptable ARD values and RMSD values among all the satisfactory fitting results given by each equation. The mixing Gibbs energy, enthalpy and entropy of real solution were derived based on the Wilson equation and the measured solubility data.
研究领域:
物理化学
·
药物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2015
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IF 2.679
Qi Zhang,Yang Yang,Limin Cheng,Cuicui Cao,Zhiwen Ding,Chunxiao Wang,Wenge Yang,Yonghong Hu,Yonglan Li
The solubility of dl -malic acid in binary solvent mixtures consisting of (methanol + acetonitrile); (methanol + N,N-dimethylformamide); and (methanol + isopropyl alcohol) was measured at temperatures ranging from (278.15 to 328.15) K by gravimetric method. Values of the solubility were fitted using modified Apelblat equation and Buchowski–Ksiazaczak λ h model. Computational results showed that the modified Apelblat equation was superior to the other equation. In addition, the thermodynamic properties of the solution process, including the Gibbs free energy, enthalpy, and entropy were calculated by the van’t Hoff analysis. This study provides valuable data for the dl -malic acid purification by the preferential crystallization procedure.
研究领域:
化学工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 11
·4190
·
IF 3.4
Yaxuan Ding,Nguyen Thi Hong Nhung,Jiahao An,Hao Chen,Lianying Liao,Chunlin He,Xinpeng Wang,Toyohisa Fujita
Lithium recovery is imperative to accommodate the increase in lithium demand. Salt lake brine contains a large amount of lithium and is one of the most important sources of lithium metal. In this study, Li2CO3, MnO2, and TiO2particles were mixed, and the precursor of a manganese–titanium mixed ion sieve (M-T-LIS) was prepared by a high-temperature solid-phase method. M-T-LISs were obtained by DL-malic acid pickling. The adsorption experiment results noted single-layer chemical adsorption and maximum lithium adsorption of 32.32 mg/g. From the Brunauer–Emmett–Teller and scanning electron microscopy results, the M-T-LIS provided adsorption sites after DL-malic acid pickling. In addition, X-ray photoelectron spectroscopy and Fourier transform infrared results showed the ion exchange mechanism of the M-T-LIS adsorption. From the results of the Li+desorption experiment and recoverability experiment, DL-malic acid was used to desorb Li+from the M-T-LIS with a desorption rate of more than 90%. During the fifth cycle, the Li+adsorption capacity of the M-T-LIS was more than 20 mg/g (25.90 mg/g), and the recovery efficiency was higher than 80% (81.42%). According to the selectivity experiment, the M-T-LIS had good selectivity for Li+(adsorption capacity of 25.85 mg/g in the artificial salt lake brine), which indicates its good application potential.Keywords:lithium-ion sieve;salt lake brine;DL-malic acid;ion exchange;lithium selectivity
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CORROSION SCIENCE
·
2022
·
IF 7.72
Youmin Qiu,Xiaohui Tu,Xiaopeng Lu,Junjie Yang
In the present work, the synergistic corrosion inhibition effects between sodium fluoride (NaF) and DL-malic acid (DMA) on Mg-Al-Mn magnesium alloy in the pH neutral NaCl solution were studied through a visual identification based high-throughput screening method and a series of characterization techniques. The highest inhibition efficiency (94.1%) and synergistic factor (3.8) were achieved when an equal amount (0.05 M) of components was mixed. This excellent anti-corrosion performance was achieved by the formation of a particle-refined perovskite (NaMgF 3 ) film on the alloy surface resulting from the incorporation of DMA in the nucleation and growth of NaMgF 3 .
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 4
·1784-1796
·
IF 3.925
Minjia Lu,Pingping Jiang,Pingbo Zhang,Shan Feng,Zhixuan Cui,Qingkui Song,Yong Zhao
The current research efforts in the plasticizer industry should focus on finding renewable biomass chemical feedstocks to synthesize non-toxic and effective bio-based plasticizers in order to adapt to the concept of green environmental protection given the scarcity of petroleum resources and the growing emphasis on health and environmental protection. In this study, lactic acid, DL-malic acid, and levulinic acid were used as the main raw materials in a three-step esterification reaction to successfully synthesize a novel high-efficiency plasticizer (LLMEE) containing multiple ester groups. The structure of LLMEE was characterized and confirmed by FT-IR, 1H NMR, and time of flight mass spectrometry (TOF-MS). The plasticizing properties of LLMEE in PVC were tested and compared to the commercial plasticizers acetyl tributyl citrate (ATBC) and dioctyl phthalate (DOP). The results of optical performance showed that, compared to ATBC and DOP, PVC plasticized by 50 phr LLMEE had both high transparency and UV resistance. According to the results of tensile tests, the elongation at break of PVC plasticized by 60 phr LLMEE reached 833.1%, indicating its excellent mechanical properties. The TGA results showed that the thermal stability of PVC plasticized by LLMEE was comparable to that of PVC plasticized by DOP or ATBC. Most importantly, LLMEE exhibited excellent migration stability in various leaching tests compared to commercial plasticizers. Taken together, the results indicated that compared with ATBC and DOP, LLMEE had better comprehensive performance, and provides a new choice to rationally utilize biomass raw materials to prepare novel environmentally friendly plasticizers.
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
危险品化学品经营许可证（带存储）