JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2021
·
IF 5.541
Zhen-Guo Fan,Zhen-Yu Tian,Wang Li,Zhi-Hao Zheng,Jiu-Zhong Yang
N, N-dimethylformamide (DMF) is a kind of general solvent in Li-ion industry and nitrogen-containing component of amines fuels. The trace vapor of DMF is very harmful to human and environment, which could be treated by pyrolysis. The pyrolysis of DMF was newly carried out in a flow reactor at 30 Torr within 873–1273 K. Synchrotron radiation single photoionization coupled with molecular beam mass spectrometry was employed to detect the reactants, intermediates and products. 26 species were identified and quantified. Products related to NOx, such as nitrosomethane, nitrosyl cyanide and N-methylformamide were identified. With the temperature increasing, the mole fractions of species tend to increase monotonically, while nitrosyl cyanide, ethyl radical, cyclopropane , carbon monoxide , ethanol, acetaldehyde and ethanol exhibit peak-shaped curves. Hydrogen abstractions and dissociations are the main initial pathways of DMF consumption. As the main hydrocarbon products, methane and ethylene are predominantly formed by the H abstraction reaction by methyl radical and the β-scission of ethyl radical, respectively. Carbon monoxide is mainly generated from the dissociation of DMF and its mole fraction is at the same level as the fuel DMF. HCN is the most abundant product among all the carbonitride species via H abstraction of CH 2 =NH as well as the collisions of CN with alkanes and aldehydes. These results provide a theoretical basis for further study of treating DMF in the exhaust fumes through pyrolysis and have reference value for the clean utilization of amine fuels.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2021
·Vol. 331
·期 1
·241-247
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IF 1.371
Wang J. H.,Zhao X. Y.,Shi Y.,Wan Y.,Fu H. Y.,Zheng W. F.
The reaction mechanisms and rate constants of N, N-diethylhydroxylamine (DEHA) with · OH, CO 3 − · , e aq − and · H were studied. Results show that · OH radicals oxidize DEHA by hydrogen abstraction from DEHA’s hydroxyl group to form transient (C 2 H 5 ) 2 NO · , which has an absorption maximum at 395 nm. The transient intermediates for the reactions of DEHA with CO 3 − · and e aq − , as well as protonated DEHA with · H, show no absorption peak between 300 and 800 nm. The rate constants for the reactions of DEHA with · OH, CO 3 − · and e aq − , also protonated DEHA with · H, were measured.
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ULTRASONICS SONOCHEMISTRY
·
2021
·
IF 7.491
Hanyang Gao,Kunkun Pei,Dong Lei,Guoxin Hu,Yan Chao,Aihua Meng,Hongcheng Wang,Wei Shentu
Due to the tunability in mass transfer, solvation and solubility, gas-expanded liquids show advantages over traditional organic solvents in many characteristics. Ultrasonication is a commonly used method to promote heat and mass transfer. The introduction of ultrasonic technology into the gas-expanded liquid system can promote the polymerization of polymer monomers, enhance extraction efficiency, and control the growth size of nanocrystals, etc. Although acoustic cavitation has been extensively explored in aqueous solutions, there are still few studies on cavitation in organic liquids, especially in gas-expanded liquid systems. In this article, the development of cavitation bubble cloud structure in CO 2 -expanded N, N-dimethylformamide (DMF) was observed by a high-speed camera, and the cavitation intensity was recorded using a spherical hydrophone. It was found that the magnitude of the transient cavitation energy was not only related to input power, but also closely related to CO 2 content. The combination of ultrasound (causing a rapid alternation of gas solubility) and gas-expanded liquid system (causing a decrease in viscosity and surface tension of liquids) is expected to provide a perfect platform for high-speed mass transfer.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 43
·e53050
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IF 3.057
Lili Xing,Yirong Wang,Jin Cheng,Aijing Li,Jiali Gu,Xue Dong,Guoqiang Chen,Tieling Xing
With the rapid development of textile technology, single-function textile finishing is difficult to meet the current needs of people for textiles. Textiles with flame retardancy, superhydrophobicity, UV resistance, and other functions are increasingly favored by people. At present, most of the preparation processes of multifunctional textiles are complex and time-consuming. In this work, a flame retardant hexamethylenediamine tetramethylene phosphate ammonium salt of hexamethylenediamine - N, N, N′, N′ - tetra (methylphosphonic acid) (AHDTMPA) was synthesized using hexamethylenediamine tetramethylene phosphate (HDTMPA) and urea with aqueous solution as solvent. Then AHDTMPA and cetyltrimethoxysilane were added into the solution with methyl trimethoxysilane (MTMOS) and tetraethyl orthosilicate (TEOS) as precursors to obtain a multifunctional sol. Finally, the multifunctional cotton fabric can be obtained by immersing the cotton fabric in the multifunctional sol in one-step. The limiting oxygen index (LOI) and water contact angle (WCA) value of the finished cotton fabric was 27.6% and 131.4°, respectively. The FT-IR characterization results and the SEM analysis verified the synthesis of AHDTMPA. The micro calorimeter combustion (MCC) and thermo gravimetric (TG) analysis indicated that the finished samples had less heat release capacity and less weight loss. The smoke density test showed good smoke suppression of the finished cotton fabric. Moreover, the whiteness of finished samples was nearly unchanged. In this work, the flame retardant and hydrophobic multi-functional cotton fabric was prepared by one-step, and the method is simple and efficient. The prepared functional cotton fabrics can be widely used in home textile fabrics, automotive interior fabrics, clothing fabrics, flags, tents, and protective clothing.
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FUEL
·
2023
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IF 7.4
Wenbin Huang,Qiang Wei,Haoran Liu,Han Yang,Zhen Xu,Zhengyu Chen,Dongdong Chen,Yasong Zhou
The reason for high-difficulty nitrogen removal of aromatic N-heterocyclic compounds in petroleum fractions was investigated from the main thought of “NiWS property - Reaction behavior - DFT calculation”. The properties of the used catalyst were characterized by a series of techniques with the aim of providing the basis for model construction in the DFT calculations. The kinetic experiments in fixed-bed reactor revealed that although 1,2,3,4-tetrahydroquinoline (THQ1) and decahydroquinoline (DHQ), o-ethylaniline (OEA) exhibited relatively high yields in the HDN reaction of quinoline and indole respectively, they were all able to show high conversions and HDN rates when reacted as feedstocks alone. The study of product normalizations in the reaction system of the mixed feedstocks demonstrated that the difficulty of conversion of THQ1 and DHQ in quinoline HDN was mainly due to the inhibition effect of quinoline feedstock. While in the HDN of indole, the presence of the intermediate product OEA was the main factor for the low conversion of indole. This phenomenon of inhibition originating from within the molecular reaction network was proposed as N-N self-inhibition effect for the first time. The DFT calculations suggested that the inhibition of quinoline on THQ1 could be attributed to the adsorption advantage of quinoline, while the inhibition on DHQ was mainly due to the steric hindrance effect of DHQ itself. And the inhibition effect of OEA on indole can be mainly attributed to its greater nucleophilicity and stronger adsorption ability on the active sites compared with IND.
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EUROPEAN POLYMER JOURNAL
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2014
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IF 3.242
Houluo Cong,Jingang Li,Lei Li,Sixun Zheng
In this contribution, we reported the synthesis of poly(N-isopropylacrylamide)- block -poly(N-vinylpyrrolidone)- block -poly(N-isopropylacrylamide) (PNIPAM- b -PVP- b -PNIPAM) triblock copolymers through sequential reversible addition–fragmentation chain transfer/macromolecular design via the interchange of xanthate (RAFT/MADIX) process. The triblock copolymers have been characterized by means of 1 H nuclear magnetic resonance (NMR) spectroscopy, gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). This ABA triblock copolymer displayed a typical thermoresponsive gelation behavior. In this work, the thermoresponsive gelation behavior was investigated by means of rheological measurements, micro-differential scanning calorimetry (Micro-DSC) and small angle X-ray scattering (SAXS). The thermoresponsive gelation behavior could endow the triblock copolymers with the potential application as injectable hydrogels.
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Sustainable Chemistry and Pharmacy
·
2024
·
IF 5.5
Gang Zhou,Liyong Hu,Zeyu Wang,Changjie Shi,Jiachao Yao,María C. Veiga,Christian Kennes,Jun Chen
This study investigated the interaction during biodegradation between hydrophilic N, N-dimethylacetamide (DMAC) and hydrophobic n -hexane, both of which are common volatile organic compounds (VOCs) in the pharmaceutical industry. A rotating drum biofilter (RDB) was utilized to remove DMAC and n -hexane simultaneously. The results indicated that the addition of 800 mg/L DMAC shorten the start-up time from 23 days to 18 days of RDB, and increased the n -hexane removal efficiency from 42% to 60%, compared with the biodegradation of n -hexane alone. Further, the protein (PN)/polysaccharide (PS) ratio in the extracellular polymer substance (EPS) was increased from 1:5.62 to 2.25:1. Interestingly, microbial community analysis revealed that the addition of DMAC led to an increase in the proportion of Proteobacteria , which tended to secrete EPS with a high proportion of PN. This PN-rich EPS enhanced the adhesive force of the biofilm and lowered the surface tension of the liquid, which led to the improvement of biofilm trapping of n -hexane. Meanwhile, the excitation-emission-matrix results suggested that the tryptophan-like and tyrosine-like substances provided protection during acid stress and acted as a carbon source for cellular life activities during starvation. Finally, as a further validation, the molecular ecological network also showed that Proteobacteria had the most positive connections (65.47%). Overall, this study found that the removal of hydrophobic compounds could be facilitated by the addition of hydrophilic compounds in the bioreactor, which contributes to the biological treatment of mixed VOCs in practical exhaust gases.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2016
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IF 3.299
Xinrui Zhang,Liyong Yuan,Zhifang Chai,Weiqun Shi
A novel tetradentate ligand combining hard O-donor and soft N-donors in the same molecule, N,N′-diethyl-N,N′-ditolyl-2,9-diamide-1,10-phenanthroline (Et-Tol-DAPhen), was developed in our laboratory aiming at the group separation of actinides from lanthanides. Herein, the solvent extraction of UO 2 2+ by Et-Tol-DAPhen in 1-(trifluoromethyl)-3-nitrobenzene diluent was investigated in detail. The effects of contact time, Et-Tol-DAPhen concentration, acidity, and competing ions on the extraction were discussed, the extracted UO 2 2+ speciation was analysed, and the stripping of UO 2 2+ from organic phase was performed. The results clearly show that Et-Tol-DAPhen/1-(trifluoromethyl)-3-nitrobenzene provides a highly efficient extraction of UO 2 2+ from HNO 3 media with a fast extraction kinetics of less than 5 min and a large distribution ratio of more than 300. Moreover, the system shows excellent selectivity toward UO 2 2+ over Ln 3+ in a wide acidity range. Stripping experiments indicate that almost a complete back extraction of UO 2 2+ could be achieved via only one stage operation using 5% Na 2 CO 3 solution. Findings of the present work provide new data for assessing the feasibility of Et-Tol-DAPhen, as well as other new ligand with hard–soft donors combined in the same molecule, applied in the group separation of actinides over lanthanides.
研究领域:
化学
·
核化学与放射化学
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 4
·1731-1740
·
IF 1.754
Kubota Masahiko,Wu Hao,Kim Seong-Yun
A N’-N’ -di-n-hexyl-thiodiglycolamide and 2,2’-[(2-ethylhexyl)imino]bis[ N,N -bis(2-ethylhexyl)acetamide] impregnated porous silica-based adsorbent was prepared for enhancing the adsorption of palladium ions from simulated high-level liquid waste. The adsorbent exhibited a relatively fast palladium response and selectivity without the use of additional modification reagents. Palladium ions were adsorbed over a wide nitric acid range of 0.6−5 M and a broad temperature range of 288−323 K. The uniform distribution of adsorbed palldium ions onto the study adsorbent was confirmed by PIXE. Successful recovery of more than 90% of the palladium ions was achieved using 0.1 M thiourea via separation by column experiments. Based on the obtained data, it is expected that the prepared adsorbent can be used for the practical separation of palladium ions from high-level liquid waste.
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CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Jinhang Dai,Qingya Cao,Ziting Du,Ronghe Yang,Delong Yang,Fukun Li,Xingxing Gu
The effective conversion of renewable chitin and its derivatives to organonitrogen chemicals is of significance. N -acetylmonoethanolamine (NMEA) is a compound that can be produced from N -acetylglucosamine (NAG, the monomer of chitin) via successive retro-aldol and hydrogenation reactions. Here we report the aerobic oxidation of NMEA to N -acetylglycine in O 2 using cheap Fe(NO 3 ) 3 ⋅9H 2 O, TEMPO, and KCl. The effects of catalysts, additives, and reaction conditions on the N -acetylglycine synthesis were investigated. Under optimized conditions, a 62.1% yield of N -acetylglycine with almost full conversion was obtained.
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JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH
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2020
·
IF 1.345
Gen-Qiang Chen,Yan-Fei Xia,Jin-Ming Yang,Zhi-Ping Che,Di Sun,Shen Li,Yue-E Tian,Sheng-Ming Liu,Jia Jiang,Xiao-Min Lin
Gramine can be intelligently and efficiently supplied with N, N-dimethylamino group and then reacted with the corresponding sulfonyl chlorides to synthesize N, N-dimethylarylsulfonamides. We herein designed and controlled synthesis of N, N-dimethylarylsulfonamide derivatives, and first reported the results of the nematicidal activity of 15 title compounds 3a-o against Meloidogyne incongnita in vitro, respectively. Among all of the title derivatives, compounds 3a, 3c, 3k, and 3o exhibited potent nematicidal activity with median lethal concentration (LC50) values ranging from 0.22 to 0.26 mg/L. Most noteworthy, N, N-dimethyl-4-methoxyphenylsulfonamide (3c) and N, N-dimethyl-8-quinolinesulfonamide (3o) showed the best promising and pronounced nematicidal activity, with LC50 values of 0.2381 and 0.2259 mg/L, respectively.
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高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2016
·
IF 0.661
Zhengyi Li,Yuan Chen,Yue Yin,Zhiming Wang,Xiaoqiang Sun
A simple and convenient two-step method has been developed and used to synthesise 25 (4 of which are novel) unsymmetrical N,N′-disubstituted thioureas in water. Alkylamines or variously substituted arylamines reacted smoothly with phenyl chlorothionoformate at room temperature to form thiocarbamates, which were then reacted with another alkyl- or arylamine in water at reflux to afford the unsymmetrical N,N′-disubstituted thioureas in good to excellent yields. Mild conditions, simple work-up, high yields as well as using water as solvent are the major advantages of the method.
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