JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 40
·期 17
·3414-3421
·
IF 2.557
Jie Zhou,Jie Xu,Xiangyuan Zheng,Wenyuan Liu,Feng Zheng
Methanesulfonic acid is routinely used in pharmaceuticals but can contain potentially genotoxic impurities such as methyl methanesulfonate and ethyl methanesulfonate. The aim of this study was to develop a simple high-performance liquid chromatography with ultraviolet detection method for determining methyl methanesulfonate and ethyl methanesulfonate in methanesulfonic acid. Samples (250 mg) in water/acetonitrile (200 μL) were first combined with 10.0 mol/L sodium hydroxide solution (270 μL). Then they were mixed with 2.0 mg/mL N , N -diethyldithiocarbamate (500 μL), diluted to 5 mL with N , N -dimethylacetamide and allowed to react at 80°C for 1 h. The derivatives were analyzed using gradient high-performance liquid chromatography with ultraviolet detection (277 nm) and structurally elucidated by liquid chromatography with mass spectrometry. With acetonitrile/5 mmol/L ammonium acetate solution as the eluent and 1 mL/min as the flow rate on a C18 column, the derivatives were eluted at 10.6 and 14.8 min. Good linearity (correlation coefficients > 0.999) and low limits of quantitation (0.6 ppm) were obtained. The recoveries were in the range of 80–115% with relative standard deviation < 5.0%. Finally, the established method was successfully used for the determination of methyl methanesulfonate and ethyl methanesulfonate in methanesulfonic acid.
研究领域:
分析化学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2020
·
IF 5.578
Gang Chen,Zhichao Zhou,Xiaodan Shi,Xiaolong Zhang,Sanbao Dong,Jie Zhang
Small molecule flow improver for heavy oil recovery has attracted great attention in oilfield chemistry . In this study, 24 alkylbenzenesulfonates were synthesized and evaluated as crude oil flow improvers. The results show that all of the alkylbenzenesulfonates were effective, the chromium alkylbenzenesulfonate (CrDBS) and zinc alkylbenzenesulfonate (ZnDBS) were found to have the best performance with the viscosity reduction rate of higher than 90%. Besides, the CrDBS and ZnDBS can depress the pour point of the crude oil sample by 21.0 °C and 16.0 °C, respectively. The co-crystallization of alkylbenzenesulfonate with the saturated hydrocarbons in the crude oil could disorder the wax crystals and depress the pour point. In addition, DSC was used to reveal the mechanism of viscosity reduction and pour point depressing by alkylbenzenesulfonates. The flow improver can disturb the formation of hydrogen bonds and the π-π interaction bonds among the polycyclic aromatic hydrocarbons and the resin macromolecules . Besides, the field test using ZnDBS confirmed its good performance and promising application potential in enhancing the heavy oil recovery.
研究领域:
石油化学
·
油田开发
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Cong Chang,Shenghai Yang,Shanshan Liu,Henghui Wang,Hong Liu,Junjie Qu,Wei Jin,Changhong Wang,Yongming Chen
As the mainstream hydrometallurgical medium of bismuth sulfide concentrate, chloride/hydrochloric acid suffers from high volatility, strong corrosiveness, and inferior deposit quality. In this paper, methanesulfonic acid (MSA) with low volatility and high stability was adopted as the bismuth hydrometallurgical system, and the membrane electrochemical deposition method was proposed to extract bismuth metal from a bismuth-containing solution. The effects of additives, such as calcium lignosulfonate (CL), tetrabutylammonium chloride, β-naphthol, and lugalvan NES, on the morphology of bismuth deposits and electric energy consumption (EEC) were investigated in detail. The addition of CL as an additive could produce dense and flat bismuth deposits while the EEC is reduced simultaneously. Cyclic voltammetry and chronoamperometry analysis reveal the electrochemical behavior of bismuth deposition in the CL-assisted MSA medium, and the nucleation and growth of bismuth grains follow a 3D ″nucleation/growth″ mechanism. Under a cathode current density of 180 A/m2, a flat metallic bismuth deposit (purity > 99.96%) is produced in the presence of 0.5 g/L CL. The cathodic current efficiency (CCE) and EEC of membrane electrodeposition are 98.25% and 705 kWh/t Bi, respectively. Compared with chloride/hydrochloric acid, the bismuth membrane electrodeposition process in the CL-assisted MSA system has the advantages of being energy-saving, green, and safe, and it has a good application prospect in the field of bismuth hydrometallurgy.
研究领域:
冶金学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2011
·
IF 3.074
Ting Wu,Xiang Cai,Shaozao Tan,Hongye Li,Jiesheng Liu,Weidong Yang
In order to explore the potential of graphene (G) in removal of hazardous chemicals in waste water, chemically reduced graphene oxide was employed as the adsorbent and the adsorption characteristics of graphene toward acrylonitrile (AN), p-toluenesulfonic acid (p-TA), 1-naphthalenesulfonic acid (1-NA) and methyl blue (MB) were evaluated under laboratory conditions. The results showed that the organic chemicals with larger molecule size and more benzene rings possessed a higher adsorption speed and a higher maximum adsorption capacity on G. The maximum adsorption capacities of p-TA, 1-NA and MB on G are ∼1.43 g/g G, ∼1.46 g/g G and ∼1.52 g/g G at 30 °C, respectively, which are the highest values of p-TA, 1-NA or MB adsorption on different kinds of today's nanomaterials. Under the maximum adsorption capacity, the absorption quantity of MB on G was dependent on the initial concentration of MB, and higher temperature could facilitate the adsorption process. The G efficiency remains almost constant during the first five cycles of the adsorption–desorption process. In addition, the fluorescence spectra implied that the adsorption of MB on G was a π–π stacking adsorption process. In conclusion, the G could serve as a promising adsorbent for the removal of chemicals containing benzene rings in waste water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Cong Chang,Shenghai Yang,Hong Liu,Junjie Qu,Jiaqi Qi,Jie Dai,Wei Jin,Tianxi Huang,Xinbing Xia,Changhong Wang,Yongming Chen
Methanesulfonic acid (MSA, CH 3 SO 3 H) emerges as a sustainable and stable medium for membrane-assisted electrodeposition in bismuth (Bi) recovery. The incorporation of calcium lignosulfonate (CL) within the MSA-based system markedly improves the electrodeposition quality and efficiency of Bi, although the exact electrochemical mechanism and kinetics of CL's influence remains unclear and warrant further investigation. Our study focuses on the impact of CL on the electrochemical behavior through quantum chemical calculations, molecular dynamics simulations, electrochemical analyses and in-situ electrochemical optical microscopy. Within the primary solvation shell, Bi 3+ associates closely with water and CH 3 SO 3 − ions, while CL is embedded in the secondary shell, forming a complex interaction network with Bi 3+ , H 2 O, and CH 3 SO 3 − , culminating in a solvation complex of Bi(CH 3 SO 3 )1.68·0.02CL·6·72H 2 O. This complex disrupts intra-solution hydrogen bonding, reduces water activity and undesirable side reactions, and thus promotes the electrodeposition efficiency. At the cathode's double electric layer, de-solvated Bi(CH 3 SO 3 ) 2 + · n H 2 O ions are preferentially discharged and reduced. The pronounced physical adsorption of CL at the interface facilitates a three-dimensional electro-crystallization nucleation and growth process, yielding a uniform, smooth, and compact Bi deposit. Our findings not only extend the electrochemical understanding but also provide practical insights for optimizing Bi recovery in the CL-MSA system, with implications for the electrochemical recovery of other metals like lead and tin.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2016
·Vol. 20
·期 1
·183-191
·
IF 1.853
Wang Yong,Liu Xiaochen,Jiao Tiliu,Niu Jinping
Comparison of surface and interfacial properties of internal olefin sulfonates (IOS) and alpha olefin sulfonates (AOS) shows that hydrocarbon chain branching has a significant influence on interfacial properties at the air–water, pentadecane–water and parafilm–water interfaces. The isomeric branched IOS shows a higher critical micelle concentration and are more effective in reducing the surface tension at the air–water interface by occupying a larger area per molecule. IOS exhibits better dynamic air–water interfacial properties due to a lower meso-equilibrium surface tension. The equilibrium interfacial tensions for AOS and IOS have no remarkable difference at the pentadecane–water interface. The water wettability and electrolyte tolerance are enhanced with branched hydrocarbon chain olefin sulfonates.
研究领域:
化学工程
·
表面化学
✓ 已验证
DOI
高影响因子
TENSIDE SURFACTANTS DETERGENTS
·
2014
·Vol. 51
·期 6
·516-520
·
IF 0.559
Tong Zhang,Xu Li,Jinxiang Dong
The purpose of this paper is to describe a more efficient catalyst for the synthesis of lauraldehyde glycerol acetal. Catalytic effect of methane sulfonic acid and p -toluenesulfonic acid were compared. With a mixture of 0.67 wt.% methanesulfonic acid in relation to lauraldehyde, equimolar amounts of glycerol and lauraldehyde being stirred at 110 °C for 2.5 h, the yield of the product was 76.32 %. When p -toluenesulfonic acid was used, the amount of the catalyst was 0.91 wt.% and the yield of the product was 62.91 % after reacting for 2.5 h at 120 °C. The result reveals that methane sulfonic acid is more efficient. Surface tension measurements showed that critical micelle concentration of the product catalyzed by methanesulfonic acid was 5.33 × 10 −5 mol · L −1 , and at this point the surface tension could achieve about 24 mN m −1 .
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.454
R. X. Niu,J. Y. He,B. Long,D. Q. Wang,H. Song,C. Wang,G. M. Qu
Nonylphenol dodecyl sulfonate (C12NPAS) has been synthesized, and mixed with heavy alkyl benzene sulfonates (HABS) in different proportions. The effects of different mixing ratios on properties such as adsorption, wetting, foaming, and emulsification, of the C12NPAS/HABS surfactant mixtures have been systematically investigated. Experimental results have shown that, after mixing, the wetting and foaming properties of C12NPAS/HABS are improved remarkably. Compared with C12NPAS and HABS alone, the adsorption and emulsifying properties of C12NPAS/HABS are far superior, which we attribute to a synergistic effect between these surfactants.
研究领域:
化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Wenshuo Wang,Pengju Pan,Yongzhong Bao
To meet improved requirements for proton-exchange membranes (PEMs) applied in medium- and low-temperature fuel cells, novel PEMs with superior performance are prepared by using commercial perfluorinated sulfonic-acid ionomer (PFSA) and a dopant, tetraphenylporphyrin tetrasulfonic-acid (TPPS). Different from physically blending PFSA with another polymer or a nano-material, the membrane-forming mechanism of TPPS modified PFSA PEMs is highly dependent on the efficient interaction between PFSA and TPPS molecules. The unique three-part nested hydrophilic-hydrophobic-hydrophilic molecular structure of TPPS plays a crucial role in the co-assembly of PFSA with TPPS. The more intensive ionic cross-linking and hydrogen-bond networks are formed through hydrophilic groups in the outer and internal parts of TPPS and sulfonic-acid groups of PFSA. Meanwhile, secondary cross-linking of these hydrophilic groups is induced by rigid hydrophobic groups in the middle part of TPPS. Therefore, these molecular interactions induce the formation of more stable and stronger nano-phase separation with more uniform size. This novel nano-phase separation structure endows PEMs with elevated applicable temperatures, much increased proton conductivity and thus superior fuel cell performances, which are the keys to the development of more advanced hydrogen fuel cells.
研究领域:
材料科学
·
燃料电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Xiaohong Wang,Jialian Li,Chen Chen,Xu Li,Lei Liu,Jinxiang Dong
Benzene sulfonate surfactants are crucial anionic surfactants, commonly derived from petrochemical sources. Herein, we present a new method for synthesizing alkyl-tetralin sulfonate anionic surfactants using α-olefins (n-hexene, n-octene, n-decene) and tetralin sourced from the coal chemical industry as raw materials. The three-resulting alkyl-tetralin sulfonates (C6-THNS, C8-THNS and C10-THNS), obtained by alkylation and sulfonation of tetralin were characterized through HPLC, FTIR, LCMS and 1 H NMR techniques. Their surfactant properties were also investigated and compared with commercially applied linear alkylbenzene sulfonate (LAS). We observed that C6 alkyl-tetralin sulfonate (C6-THNS) exhibited smaller critical micelle concentration ( CMC =0.60 mM) and lower equilibrium surface tension ( γ CMC =33.43 mN/m). Similarly, C6-THNS also showed comparable foaming, wetting and emulsifying properties with LAS, which can be used as a substitute for LAS surfactants. This study shows that the synthesized alkyl-tetralin sulfonates is a potential surfactant, providing a route for efficiently using coal-based chemicals to synthesize surfactants.
研究领域:
化学工程
·
表面活性剂合成
✓ 已验证
产品关联
DOI
高影响因子
Collagen and Leather
·
2025
·Vol. 7
·期 1
·1-15
·
IF 9.2
Qiao Pengfei,Liu Jie,Jin Liqiang,Zhang Feifei,Feng Zhonghe,Wang Yulu
Despite its potential as a metal-free tanning agent capable of eliminating Cr pollution in the leather industry, the conventional preparation of poly(carbamoyl sulfonate) faces challenges, such as the extensive use of low-boiling organic solvents and low blocking ratios of –NCO groups. Herein, a liquid sulfonate chain extender, 2,3-dihydroxypropanesulfonic acid triethylamine salt (DHPSTEA), was initially synthesized. A series of poly(carbamoyl sulfonate) tanning agents (CTAS) were then synthesized using DHPSTEA and various diisocyanates as reaction monomers, with sodium bisulfite serving as the blocking agent and without utilizing organic solvents. CTAS demonstrated a blocking ratio of > 99% and satisfactory stability under acidic conditions at room temperature. Application experiments revealed that CTAS exhibited excellent tanning performance, with the parent diisocyanate monomer markedly influencing their tanning properties. CTAS synthesized with dicyclohexylmethane-4,4′-diisocyanate resulted in optimal product performance, yielding a shrinkage temperature of 83.2 °C at a 6% dosage. CTAS-tanned leather displayed excellent collagen fiber dispersion, yellowing resistance and mechanical properties. Additionally, CTAS is easy to biodegrade (BOD 5 /COD > 0.45). Thus, this novel metal-free tanning agent holds a great potential as a sustainable alternative to traditional chrome tanning agent. Graphical
研究领域:
皮革化学
·
绿色化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Weiping Kong,Yong Liu,Fujian Liu
Efficient micro-meso-macroporous solid acids spheres with controllable acid strength were successfully synthesized by simultaneous grafting of −SO3H and −SO2CF3 onto the network of commercial XAD-4 resin. The synthesized solid acids are designated as XAD-4-SO3H and XAD-4-SO3H-SO2CF3. Various characterizations show that XAD-4-SO3H and XAD-4-SO3H-SO2CF3 possess high BET surface areas, hierarchical porous structures with combined micro-meso-macropores, high concentrations of acid sites, and strong acid strength. Catalytic tests show that XAD-4-SO3H and XAD-4-SO3H-SO2CF3 exhibit superior activities and good reusability in various acid-catalyzed reactions including esterification of acetic acid with cyclohexanol, acylation of anisole with acetyl chloride, and catalytic synthesis of bisphenol A. Their activities were better than the solid acids of Amberlyst-15, SBA-15-SO3H-0.1, H3PW12O40, and acidic zeolites. This work develops a new method for scalable transformation of commercially macroporous resin into efficient porous solid acids, which promotes their wide use in industrial catalysis.
研究领域:
催化化学
·
材料科学
✓ 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）