JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2015
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IF 2.037
Suping Ding,Qiuxiang Yin,Wei Du,Xiaowei Sun,Baohong Hou,Meijing Zhang,Zhao Wang
Crash cooling crystallization of different anthracene (ANT) and phenanthrene (PHE) mixtures in toluene, xylene, and N,N-dimethylformamide (DMF) was investigated. The crystals obtained were identified by powder X-ray diffraction, differential scanning calorimetry, and high-performance liquid chromatography. To verify the formation of different solid solutions, ternary phase diagrams of ANT and PHE in toluene, xylene, and DMF at 308.15 K and 0.1 MPa were determined through experiments. Two solid solutions, α and β, respectively, formed at PHE-rich and ANT-rich ends but coexisted in the middle section of the composition. The effect of solvent and separation process optimization of ANT and PHE were further investigated based on the ternary phase diagrams.
研究领域:
化学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Guiliang Li,Yang Liu,Zhaoyi He,Ke Shi,Fu Liu
Covalent organic frameworks (COF) membranes are considered as promising candidates for organic solvent nanofiltration (OSN) due to their well-defined porosity, high perm-selectivity, and exceptional resistance to solvents. However, irreversible membrane fouling caused by filter cake layers or pore clogging challenges the robust separation over long-term operation especially for well-known COF membranes. Here, we present novel ultrafast covalent triazine frameworks (CTF) membranes with retrievable separation performances for OSN processes. CTF-1 membrane with unitary nanopore and CTF-m membrane with binary nanopore are fabricated via an air-organic solvent interfacial polymerization technique for comparison, which demonstrates molecular-level selectivity (MWCO, ∼320 Da for CTF-1 and ∼ 625 Da for CTF-m) and ultrafast permeability for polar organic solvents. Moreover, the heterogeneous skeleton nanopores structure of CTF-m membranes facilitates efficient separation of photogenerated carriers, thus resulting in retrievable permselectivity. This work offers an efficient strategy via Donor-Acceptor structure modulation to tackle OSN membrane fouling, paving the way for applications of framework membranes.
研究领域:
化学工程
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材料科学
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膜技术
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环境工程
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产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
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2022
·Vol. 44
·期 6
·2200826
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IF 5.006
Jiaqi Li,Weilin Feng,Mengxiao Zhang,Xiaohe Wang,Chuanjie Fang,Jianyu Wang,Lin Zhang,Liping Zhu
Polymers of intrinsic microporosity (PIMs) are a class of microporous organic materials that contain interconnected pores of less than 2 nm in diameter. Such materials are of great potential used in membranes for molecular separation, such as drug fractionation in pharmaceutical industry. However, the PIMs membranes are often susceptible to low separation selectivity toward different molecules due to their wide pore size distribution. Herein, a linear polyimide, Matrimid, is incorporated with PIM-1 (a typical member of PIMs) by solution blending, and the blends are dip-coated onto a polyimide P84 support membrane to prepare thin-film composite (TFC) membranes to control pore size distribution while keep high microporosity. The component miscibility, pore characteristics, and molecular separation performances of the Matrimid/PIM-1 TFC membranes are investigated in detail. The Matrimid and PIM-1 are partially miscible due to their similar Hansen solubility parameters. The Matrimid endows the selective layers (coatings) with narrower pore size distribution due to more compact chain packing. The prepared Matrimid/PIM-1 TFC membranes show high selectivity for separation of riboflavin (80% of retention) and isatin (only 5% of retention). The developed membranes exhibit great potential for separating molecules with different molecular weights.
研究领域:
材料科学
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化学工程
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生物医学工程
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DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
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2013
·Vol. 42
·期 8
·1591-1601
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IF 1.128
Yang Wenge,Jiang Xinmin,Hu Yonghong,Shi Ying,Sun Huiling,Li Yonglan
The solubility of fumaric acid in aqueous alcohol solutions was experimentally measured over the temperature range of (278.15–333.15) K by employing an analytical stirred-flask method. The experimental data showed that the solubility of fumaric acid in the binary mixtures increases with increases of both temperature and mass fraction of the organic solvents. The experimental data were well correlated with the modified Apelblat equation and the Buchowski–Ksiazaczak λh equation. In addition, the calculated solubilities showed good agreement with the experimental results. It was found that the modified Apelblat equation gave better correlation results than the Buchowski–Ksiazaczak λh equation. The experimental results should be useful for optimizing the process of purification of fumaric acid in industry.
研究领域:
化学工程
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工业化学
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产品关联
DOI
高影响因子
Bioresource Technology Reports
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2020
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IF 0
Kai Sun,Qingyin Li,Lijun Zhang,Yuewen Shao,Zhanming Zhang,Shu Zhang,Qing Liu,Yi Wang,Xun Hu
Polymerization is one major issue during acid-catalyzed conversion of sugars/furans to platform chemicals. Reaction medium is one of the main factors impacting the tendencies of sugars/furans towards polymerization. In this study, conversion of sugars (fructose/glucose/xylose/xylan) and furans (hydroxymethylfurfural (HMF)/furfural/furfuryl alcohol (FA)) over a solid acidic resin catalyst in various water-organic bi-solvents (toluene, chloroform , n-butanol, tetrahydrofuran (THF), dimethyl sulfoxide (DMSO) and ethyl acetate (EA)) were investigated. The results showed toluene/chloroform as the co -solvent did not suppress the polymerization of fructose, HMF, furfural and FA while diminished the formation of LA from fructose/HMF. The organic co-solvents remarkably affected properties of the coke formed. The presence of aprotic organic solvents tended to retain the C O group in the coke formed and affected its thermal stabilities and evolution of the functionalities. Additionally, polymerization tendency of the furans with the distinct structures showed very different sensitivity with the water in reaction medium.
研究领域:
化学工程
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生物质转化
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催化反应
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DOI
FLUID PHASE EQUILIBRIA
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2014
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IF 2.241
Xiang Liu,Yonghong Hu,Mengmeng Liang,Yonglan Li,Jingjing Yin,Wenge Yang
Data on corresponding solid–liquid equilibrium of maleic anhydride in different organic solvents are essential for industrial design and further theoretical studies. In this study, the solubilities of maleic anhydride were measured in DMF, methanol, acetic acid, acetonitrile , acetone, ethyl acetate , 2-propanol and n-butyl alcohol with the temperature range of 278.15–323.15 K by the analytical stirred-flask method under atmospheric pressure. The experiment results indicated that the solubility of maleic anhydride was highest in DMF and followed by methanol, acetic acid, acetonitrile, acetone, ethyl acetate, 2-propanol and n-butyl alcohol. For the temperature range investigated, the solubilities of maleic anhydride in the organic solvents increased with increasing temperature. Results of these measurements were well-correlated with the modified Apelblat equation, the Buchowski–Ksiazaczak λh equation and the van’t Hoff equation. The calculated solubilities showed good agreement with the experimental data. The modified Apelblat equation was found to regress the solubility data is higher accuracy than the Buchowski–Ksiazaczak λh equation. The experimental data and model parameters would be useful for optimizing the process of purification of maleic anhydride in industry.
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Jiaxin Gao,Xiaoyang Ou,Pei Xu,Minhua Zong,Wenyong Lou
We found a novel lipase gene in the Paenibacillus pasadenensis CS0611 strain. The lipase gene sequence was cloned into the pET-28a expression vector to construct a recombinant lipase protein containing 6 × His tags at the C- and N-termini, respectively. High-level expression of the lipase in E.coli BL21 (DE3) was obtained upon induction with IPTG at 20 °C. The recombinant lipase activity was approximately 1631-fold higher than the wild type. His-tagged recombinant lipase was purified rapidly and efficiently by using Ni-charged affinity chromatography with 63.5% recovery and a purification factor of 10.78. The purified lipase was stable in a broad range of temperatures and pH values, with the optimal temperature and pH being 50 °C and 7.0, respectively. Its activity was stimulated to different degrees in the presence of metal ions such as Ca 2+ , Mg 2+ , and some non-ionic surfactants. In addition, the purified lipase was activated by a series of water-miscible organic solvents such as some short carbon chain alcohols and was highly tolerant to some water-immiscible organic solvents.
研究领域:
生物化学
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分子生物学
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酶工程
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
Yangyi Huang,Yuning Zhang,Haoran Liu,Weiping Luo
In this study, the solubilities of isophthalic acid (IPA) in N-methylformamide (NMFM), N-methylformanilide (NMFL), propanoic acid (PA), sulfolane, and dimethyl sulfoxide (DMSO) and m-toluic acid (m-TA) in acetone, cyclohexanone (CYC), 1-methyl-2-pyrrolidinone, NMFM, NMFL, N,N-dimethylformamide, PA, sulfolane, and DMSO were determined by the dynamic laser method at atmospheric pressure (101.2 kPa), and the solubility ratios between IPA and m-TA in different solvents were calculated. The temperature range of the experiment was between 290.15 and 348.15 K, in which the solubilities of IPA and m-TA in selected solvents were positively correlated with temperature. The maximum ratio between the mole fraction of solubilities of m-TA and IPA was in CYC and ranged from 68 to 84 for the temperature range under study. The experimental data were correlated by the Apelblat model, the Buchowski–Ksiazczak λh model, and the modified nonrandom two-liquid (NRTL) activity coefficient model.
研究领域:
化学
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物理化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Haike Li,Zhiyun Kong,Huan Zhang,Xiaolei Wang,Yaohua Xie,Xingqing Zhao,Yidan Hong
It is necessary to prepare a nanofiltration membrane with high permeation flux that can be used in the field of organic solvents. Gel membranes have a high solvent permeation flux, but their chained macromolecular structure is often unstable. In this study, tannic acid-bridged sodium alginate (TA x -Ca/FeSA) organic solvent nanofiltration (OSN) membranes were prepared by the phase transition method using aqueous Ca 2+ and Fe 3+ solutions as cross-linking agents. TA can interact with SA through hydrogen bonding hydrophobic bonding and other interactions to form an interpenetrating three-dimensional network structure. Compared with Ca/FeSA membrane, the average pore size of TA 0.125 -Ca/FeSA membrane was reduced from 1.03 nm to 0.74 nm, and the porosity was increased from 47.62 to 59.2 %. In addition, the TA 0.125 -Ca/FeSA membrane has the characteristics of a negative charge, super hydrophilicity, and high mechanical properties, exhibits a high permeation flux of 48.97 L·m −2 ·h −1 ·bar −1 with a rejection of 96.25 % for Congo red ethanol solution, has excellent solvent resistance, stain resistance, and self-cleaning ability. The TA 0.125 -Ca/FeSA membrane was demonstrated to have great potential for application in the fields of purification and solvent recovery.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Qing Fang,Qin Liu,Zongli Xie,Matthew R. Hill,Kaisong Zhang
Solvent-resistant nanofiltration membranes , capable of breaking “trade-off” between permeability and selectivity while resisting physical aging, hold crucial utility in developing advanced membrane materials and reducing energy consumption associated with solvent recovery. Herein, the development of scalable, mixed matrix membranes (MMMs) was presented based on polysulfone (PSf) substrate with ultra-high permeability and aging resistance. The upper selective layer was composed of poly-trimethylsilylpropyne (PTMSP) and two types of nano-fillers, namely poly-dichloroxylene ( p -DCX) and sodium dodecylbenzene sulfonate-molybdenum sulfide (SDBS-MoS 2 ). Under the influence of the additives, the redistribution of the free volume of the polymer as well as the internal spaces within additives creates additional pathways for solvent diffusion, thus increasing solvent permeance. Additionally, the combined effect of the two additives is likely to inhibit filler agglomeration and improve the overall effectiveness of the additives. Compared to pure PTMSP membranes, the p -DCX/SDBS-MoS 2 PTMSP MMMs exhibited enhanced methanol permeance (10.58 vs. 3.14 L m −2 h −1 bar −1 ) and RB rejection (99.23 vs. 96.13 %), which greatly exceeded that of current OSN MMMs. As anticipated, aging of the prepared membranes decelerated with the addition of the additives, and the methanol permeation loss rate decreased from 50.32 % to 13.23 % after 300 h. Molecular dynamics simulations explored by structural analysis revealed the mechanism for the significant improvement in methanol permeance and aging resistance. The membranes obtained were found to be highly industrially applicable, thereby offering the potential to reduce operation costs in energy-intensive separation processes.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Baoguo Zhang,Li Wang,Yubao Liu,Yongjian Zhang,Lipeng Zhang,Zhongning Shi
Reliable access to Nd-containing mineral resources and their effective future use and recycling are crucial for the sustainable development of industries based on rare earth metals. As a precursor for room-temperature Nd electrodeposition, NdCl 3 is advantageous due to its abundance, low cost, and high availability; however, it is poorly soluble in most specialized ionic liquids and is therefore not widely used in solvometallurgical processes. Herein, we develop a practical means of Nd electrodeposition from a solution of NdCl 3 and AlCl 3 in 1,3-dimethyl-2-imidazolidinone, revealing that Al electrodeposition does not occur at the employed AlCl 3 concentration. Instrumental and electrochemical techniques are used to confirm the electrodeposition of Nd on high-purity Al substrates, and together with theoretical calculations, these techniques are employed to probe the mechanism of NdCl 3 dissolution, the electrolyte structure/composition, and the electrochemical behavior of the Nd-containing electroactive species. Our findings provide a strategy and theoretical basis for the cost-effective electrowinning of rare earth metals from their chlorides as upstream precursors.
研究领域:
冶金学
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材料科学
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化学工程
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DOI
高影响因子
Food and Bioprocess Technology
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2024
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IF 5.3
Hu Jin,Yang Wencheng,Lan Huanling,Lin Xueyuan,Li Chang
Rice ( Oryza sativa ) bran is a by-product of rice processing, which contains rich nutrients and is a resource that can be fully utilized. However, lipase in rice bran can lead to rancidity of rice bran oil. Therefore, it is important to study the characteristics of rice bran lipase for the stable storage of rice bran. A new lipase from rice bran was isolated by DEAE Sepharose column and gel filtration column, respectively. The determination of lipase’s molecular weight and purity was conducted utilizing the SDS-PAGE technique, and the enzyme was identified through LC-MS/MS. Concurrently, an investigation was conducted on the characteristics of the lipase. The findings indicated that the lipase had a molecular weight of 36.352 kDa. Optimal catalytic activity for rice bran lipase (RBL) was observed at a temperature of 40 ℃ and pH value of 7.0, while it exhibited remarkable stability below 20 ℃ and within the pH range from 6.0 to 8.0. The stability of the RBL against various metal ions and high NaCl concentrations was observed to be relatively modest. Notably, the catalytic activity was significantly influenced by certain organic solvents (such as acetone, THF, and trichloromethane) as well as several inhibitors ( P < 0.05). Furthermore, RBL demonstrated a preference for hydrolyzing long-chain p-NP esters (C12-C16).
研究领域:
生物化学
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食品科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）