The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Qin-hua Song - One of the best experts on this subject based on the ideXlab platform.
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Selectively instant-response nanofibers with a fluorescent chemosensor toward Phosgene in gas phase
Journal of Materials Chemistry C, 2019Co-Authors: Shao-lin Wang, Chuan-ling Zhang, Qin-hua SongAbstract:Owing to the distinct advantages such as facility, low cost and simplicity, fluorescent chemosensors are highly suitable for field detection and rapid screening of suspected chemical warfare agents (CWAs) such as Phosgene. For an effective fluorescent chemosensor, instantaneous response to Phosgene is one of the several key considerations in practical applications. In this paper, we reported a fluorescent chemosensor, Phos-3, constructed with o-diamine moiety as the active site, which includes one aliphatic primary amine and one aromatic secondary amine for rapid and selective detection of Phosgene via colorimetric and ratiometric fluorescence response. The sensing reaction involved two successive carbamylations between Phos-3 and Phosgene. The aliphatic amine of o-diamine possessed stronger nucleophilicity than the aromatic amine and could undergo fast intermolecular (the first) carbamylation with Phosgene. The second intramolecular carbamylation was accelerated since the pentacyclic moiety limited the C–N rotation of o-diamine. As a result, the sensing reaction displayed a rapid optical response (∼60 s in solutions) with high sensitivity (LOD = 0.3 nM) and high selectivity. Importantly, Phos-3-embedded polymer nanofibers were prepared by the electrospinning technique for the detection of Phosgene in the gas phase. These nanofibers embedded with Phos-3 displayed a quick response (≪1 s) to Phosgene with high sensitivity (LOD = 25 ppb) and high selectivity. This study will pave the way for its practical application in rapid screening of Phosgene in suspected gas samples.
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Fluorescent Chemosensor for Dual-Channel Discrimination between Phosgene and TriPhosgene
2019Co-Authors: Shao-lin Wang, Qin-hua SongAbstract:As highly toxic and accessible chemical reagents, Phosgene and triPhosgene have become a serious threat to public safety. So, it is highly desirable to develop facile methods to detect and recognize them. In this article, a novel fluorescent chemosensor, Phos-4, has been constructed with 1,8-naphthalimide as the fluorophore and 2-(2-aminophenyl)imidazol as the recognition sites for discrimination between Phosgene and triPhosgene in a dual-channel mode for the first time. Owing to the difference in electrophilicity between chlorocarbonyl and trichloromethoxycarbonyl, the sensing reaction of Phos-4 with Phosgene undergoes two carbamylations to afford a cyclic product with green fluorescence, and only one carbamylation occurs for triPhosgene to form a noncyclic product with blue fluorescence. The sensor Phos-4 exhibits high sensitivity (the limit of detection, 3.2 nM, for Phosgene, and 1.9 nM, for triPhosgene) and high selectivity in solutions. Furthermore, facile test papers containing Phos-4-embedded nanofibrous membrane have been fabricated by the electrospinning technology. The test papers can provide visual and selective detection of Phosgene with a lower limit of detection (42 ppb) and a faster response (≤10 s) in the gas phase over those in solutions. The test paper with Phos-4 is promising to be a practical detection tool of gaseous Phosgene
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Sensitive and Selective Detection of Phosgene, DiPhosgene, and TriPhosgene by a 3,4-Diaminonaphthalimide in Solutions and the Gas Phase.
Chemistry (Weinheim an der Bergstrasse Germany), 2018Co-Authors: Shao-lin Wang, Lin Zhong, Qin-hua SongAbstract:Phosgene and its substitutes, diPhosgene and triPhosgene, are highly toxic and widely used chemicals, so it is necessary to investigate their reactivity and develop facile, sensitive, and specific methods for detecting them. In this work, we have developed a new 1,8-naphthalimide-based fluorescent chemosensor, Phos-2, which exhibits high sensitivity (detection limits: 0.2-0.7 nm), high selectivity to Phosgene and its substitutes over nitric oxide (NO), various acyl chlorides, and nerve agent mimics in solutions. Based on investigation of the reaction kinetics of Phos-2 with Phosgene and its substitutes, a two-step sensing mechanism was clarified. The second-order rate constants (k2 ) of Phos-2 reveal that the relative rate constants of Phosgene, diPhosgene, and triPhosgene are 40:4:1. Moreover, a Phos-2 test paper has been fabricated as a low-cost, sensitive (≈5 ppm from observation by the naked eye or 0.1 ppm from a measurement), and efficient method for visual detection of a low concentration of Phosgene in the gas phase.
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bodipy based fluorescent sensor for the recognization of Phosgene in solutions and in gas phase
Analytical Chemistry, 2017Co-Authors: Hongcheng Xia, Qin-hua SongAbstract:As a highly toxic and widely used chemical, Phosgene has become a serious threat to humankind and public security because of its potential use by terrorists and unexpected release during industrial accidents. For this reason, it is an urgent need to develop facile, fast, and selective detection methods of Phosgene. In this Article, we have constructed a highly selective fluorescent sensor o-Pab for Phosgene with a BODIPY unit as a fluorophore and o-phenylenediamine as a reactive site. The sensor o-Pab exhibits rapid response (∼15 s) in both colorimetric and turn-on fluorescence modes, high selectivity for Phosgene over nerve agent mimics and various acyl chlorides and a low detection limit (2.7 nM) in solutions. In contrast to most undistinguishable sensors reported, o-Pab can react with Phosgene but not with its substitutes, triPhosgene and biPhosgene. The excellent discrimination of o-Pab has been demonstrated to be due to the difference in highly reactive and bifunctional Phosgene relative to its subst...
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a ratiometric fluorescent chemosensor for selective and visual detection of Phosgene in solutions and in the gas phase
Chemical Communications, 2017Co-Authors: Shao-lin Wang, Lin Zhong, Qin-hua SongAbstract:A ratiometric fluorescent chemosensor, Phos-1, was constructed with 4,5-diaminonaphthalimide as a fluorophore for selective and visual detection of Phosgene. The sensing mechanism was demonstrated to be the Phosgene molecule acylating both amine groups of Phos-1. A test paper with Phos-1 was fabricated for facile, selective and visual detection of Phosgene gas.
Toshiaki Sawa - One of the best experts on this subject based on the ideXlab platform.
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industrialization and expansion of green sustainable chemical process a review of non Phosgene polycarbonate from co2
Organic Process Research & Development, 2019Co-Authors: Shinsuke Fukuoka, Hiroya Fujita, Naoki Sugiyama, Takashi Adachi, Isaburo Fukawa, Toshiaki SawaAbstract:The world’s first non-Phosgene polycarbonate process from CO2 has been developed and industrialized by Asahi Kasei Corporation (Japan). Hitherto, all polycarbonates (PCs) have been produced using CO as a raw material. Among them, most PCs have been produced by so-called the “Phosgene process” using highly toxic Phosgene (COCl2) and large amounts of solvents (probable human carcinogen CH2Cl2 and water). The Phosgene process has many environmental and safety problems. However, technological barriers have hindered realizing the non-Phosgene PC process. The Asahi Kasei Process has not only solved the problems of the Phosgene process but also contributed to sustainability (reduction of CO2 emission, materials saving, and energy saving). High-quality PC and high-purity monoethylene glycol (MEG) are produced in high yields, respectively, without waste and wastewater, starting from CO2, ethylene oxide (EO), and bisphenol A (BPA). In the monomer (diphenyl carbonate: DPC) production process, innovative reactive dis...
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Industrialization and Expansion of Green Sustainable Chemical Process: A Review of Non-Phosgene Polycarbonate from CO2
2019Co-Authors: Shinsuke Fukuoka, Hiroya Fujita, Naoki Sugiyama, Takashi Adachi, Isaburo Fukawa, Toshiaki SawaAbstract:The world’s first non-Phosgene polycarbonate process from CO2 has been developed and industrialized by Asahi Kasei Corporation (Japan). Hitherto, all polycarbonates (PCs) have been produced using CO as a raw material. Among them, most PCs have been produced by so-called the “Phosgene process” using highly toxic Phosgene (COCl2) and large amounts of solvents (probable human carcinogen CH2Cl2 and water). The Phosgene process has many environmental and safety problems. However, technological barriers have hindered realizing the non-Phosgene PC process. The Asahi Kasei Process has not only solved the problems of the Phosgene process but also contributed to sustainability (reduction of CO2 emission, materials saving, and energy saving). High-quality PC and high-purity monoethylene glycol (MEG) are produced in high yields, respectively, without waste and wastewater, starting from CO2, ethylene oxide (EO), and bisphenol A (BPA). In the monomer (diphenyl carbonate: DPC) production process, innovative reactive distillation process, and in the melt polymerization process, a gravity-utilized non-agitation reactor had been developed, respectively. The Asahi Kasei Process has been expanding worldwide, and 1.07 million tons of PC will be produced in 2019. The Green Sustainable Chemical Process has been changing the PC production world. In this review, the Asahi Kasei Process and perspective of the present PC production processes together with discriminating and detailed comparisons are described
Shinsuke Fukuoka - One of the best experts on this subject based on the ideXlab platform.
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industrialization and expansion of green sustainable chemical process a review of non Phosgene polycarbonate from co2
Organic Process Research & Development, 2019Co-Authors: Shinsuke Fukuoka, Hiroya Fujita, Naoki Sugiyama, Takashi Adachi, Isaburo Fukawa, Toshiaki SawaAbstract:The world’s first non-Phosgene polycarbonate process from CO2 has been developed and industrialized by Asahi Kasei Corporation (Japan). Hitherto, all polycarbonates (PCs) have been produced using CO as a raw material. Among them, most PCs have been produced by so-called the “Phosgene process” using highly toxic Phosgene (COCl2) and large amounts of solvents (probable human carcinogen CH2Cl2 and water). The Phosgene process has many environmental and safety problems. However, technological barriers have hindered realizing the non-Phosgene PC process. The Asahi Kasei Process has not only solved the problems of the Phosgene process but also contributed to sustainability (reduction of CO2 emission, materials saving, and energy saving). High-quality PC and high-purity monoethylene glycol (MEG) are produced in high yields, respectively, without waste and wastewater, starting from CO2, ethylene oxide (EO), and bisphenol A (BPA). In the monomer (diphenyl carbonate: DPC) production process, innovative reactive dis...
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Industrialization and Expansion of Green Sustainable Chemical Process: A Review of Non-Phosgene Polycarbonate from CO2
2019Co-Authors: Shinsuke Fukuoka, Hiroya Fujita, Naoki Sugiyama, Takashi Adachi, Isaburo Fukawa, Toshiaki SawaAbstract:The world’s first non-Phosgene polycarbonate process from CO2 has been developed and industrialized by Asahi Kasei Corporation (Japan). Hitherto, all polycarbonates (PCs) have been produced using CO as a raw material. Among them, most PCs have been produced by so-called the “Phosgene process” using highly toxic Phosgene (COCl2) and large amounts of solvents (probable human carcinogen CH2Cl2 and water). The Phosgene process has many environmental and safety problems. However, technological barriers have hindered realizing the non-Phosgene PC process. The Asahi Kasei Process has not only solved the problems of the Phosgene process but also contributed to sustainability (reduction of CO2 emission, materials saving, and energy saving). High-quality PC and high-purity monoethylene glycol (MEG) are produced in high yields, respectively, without waste and wastewater, starting from CO2, ethylene oxide (EO), and bisphenol A (BPA). In the monomer (diphenyl carbonate: DPC) production process, innovative reactive distillation process, and in the melt polymerization process, a gravity-utilized non-agitation reactor had been developed, respectively. The Asahi Kasei Process has been expanding worldwide, and 1.07 million tons of PC will be produced in 2019. The Green Sustainable Chemical Process has been changing the PC production world. In this review, the Asahi Kasei Process and perspective of the present PC production processes together with discriminating and detailed comparisons are described
Pf Bernath - One of the best experts on this subject based on the ideXlab platform.
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Phosgene in the upper troposphere and lower stratosphere a marker for product gas injection due to chlorine containing very short lived substances
Geophysical Research Letters, 2019Co-Authors: Jeremy J Harrison, Mp Chipperfield, Ryan Hossaini, Chris D Boone, Sandip Dhomse, Wuhu Feng, Pf BernathAbstract:Phosgene in the atmosphere is produced via the degradation of carbon tetrachloride, methyl chloroform, and a number of chlorine‐containing very short lived substances (VSLS). These VSLS are not regulated by the Montreal Protocol even though they contribute to stratospheric ozone depletion. While observations of VSLS can quantify direct stratospheric source gas injection, observations of Phosgene in the upper troposphere/lower stratosphere can be used as a marker of product gas injection of chlorine‐containing VSLS. In this work we report upper troposphere/lower stratosphere measurements of Phosgene made by the ACE‐FTS (Atmospheric Chemistry Experiment Fourier Transform Spectrometer) instrument and compare with results from the TOMCAT/SLIMCAT three‐dimensional chemical transport model to constrain Phosgene trends over the 2004–2016 period. The 13‐year ACE‐FTS time series provides the first observational evidence for an increase in chlorine product gas injection. In 2016, VSLS accounted for 27% of modeled stratospheric Phosgene, up from 20% in the mid‐2000s.
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Phosgene in the Upper Troposphere and Lower Stratosphere: A Marker for Product Gas Injection Due to Chlorine‐Containing Very Short Lived Substances
'American Geophysical Union (AGU)', 2019Co-Authors: Jj Harrison, Mp Chipperfield, Hossaini R, Cd Boone, Dhomse S, Feng W, Pf BernathAbstract:Phosgene in the atmosphere is produced via the degradation of carbon tetrachloride, methyl chloroform, and a number of chlorine‐containing very short lived substances (VSLS). These VSLS are not regulated by the Montreal Protocol even though they contribute to stratospheric ozone depletion. While observations of VSLS can quantify direct stratospheric source gas injection, observations of Phosgene in the upper troposphere/lower stratosphere can be used as a marker of product gas injection of chlorine‐containing VSLS. In this work we report upper troposphere/lower stratosphere measurements of Phosgene made by the ACE‐FTS (Atmospheric Chemistry Experiment Fourier Transform Spectrometer) instrument and compare with results from the TOMCAT/SLIMCAT three‐dimensional chemical transport model to constrain Phosgene trends over the 2004–2016 period. The 13‐year ACE‐FTS time series provides the first observational evidence for an increase in chlorine product gas injection. In 2016, VSLS accounted for 27% of modeled stratospheric Phosgene, up from 20% in the mid‐2000s
Tdi C - One of the best experts on this subject based on the ideXlab platform.
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Study of Phosgene recovery system without compression in TDI production
Computers and Applied Chemistry, 2014Co-Authors: Tdi CAbstract:According to the analysis of present Phosgene recovery system in TDI production,a process for Phosgene recovery without compression system was proposed.The original process adopted high operation pressure in phosgenation loop and low pressure in degassing and stripping processes.The former operation condition could get a higher yield of TDI,and the latter could completely remove Phosgene and HC1 from crude production.The Phosgene separated from degassing and stripping processes needed to increase pressure again by two-stage compressor,to meet the feed condition of high pressure absorber.The two-stage compressor is not only needing large investment,but also it is prone to mechanical failure,resulting in fluctuations of the entire system or parking.In this improved process,a deep freezer was bought in the system,which condensed most of Phosgene from reaction flash separation into liquid.The remaining Phosgene accompanied with the gas from degasser and HC1 stripper was absorbed by an atmospheric absorption tower.Absorbent was pressurized by pump and returned to the phosgenation loop.The compression system was reduced.The new process was simulated by Aspen Plus simulation software,and the appropriate cryogenic temperature and the amount of absorbent was obtained.It can meet the technological requirement,reduce the energy consumption,which shows this new process is feasible.