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High efficiency ester condensation using hydrophobic zeolite membranes
Tomoya Inoue,Yuta Nemoto,Takako Nagase,Yasuhisa Hasegawa,Yoshimichi Kiyozumi,Koichi Sato,Masateru Nishioka,Satoshi Hamakawa,Toshikazu Nishide,Fujio Mizukami 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
We successfully developed zeolite membranes with hydrophilic character, by choosing appropriate zeolites in terms of hydrophilicity and high acid tolerance. We evaluated thus developed membranes by their pervaporation (PV) performance, dehydration from acidic organic solvent. The zeolite membranes we developed, based on merlinoite (MER), chabazite (CHA) or phillipsite (PHI), are shown to exhibit stable dehydration performance, respectively. We successfully applied the membranes to the selective removal of water in an ester condensation reaction starting from a stoichiometric mixture of a carboxylic acid and an alcohol. The availability of pervaporation-assisted ester condensation reaction was validated by various kinds of combinations of carboxylic acid and alcohols, which implies the general availability of pervaporation-assisted process intensification by zeolite membranes.
Higashihara Tomoya,Inoue Kyoichi,Nagura Masato,Hirao Akira The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.3
To successively synthesize star-branched polymers, we developed a new iterative methodology which involves only two sets of the reactions in each iterative process: (a) an addition reaction of DPE or DPE-functionalized polymer to a living anionic polymer, and (b) an in-situ reaction of 1-(4-(4-bromobutyl)phenyl)-1-phenylethylene with the generated 1,1-diphenylalkyl anion to introduce one DPE functionality. With this methodology, 3-, 4-, and 5-arm, regular star-branched polystyrenes, as well as 3-arm ABC, 4-arm ABCD, and a new 5-arm ABCDE, asymmetric star-branched polymers, were successively synthesized. The A, B, C, D, and E arm segments were poly(4-trimethylsilylstyrene), poly(4-methoxystyrene), poly(4-methylstyrene), polystyrene, and poly(4-tert-butyldimethylsilyloxystyrene), respectively. All of the resulting star-branched polymers were well-defined in architecture and precisely controlled in chain length, as confirmed by SEC, $^1H$ NMR, VPO, and SLS analyses. Furthermore, we extended the iterative methodology by the use of a new functionalized DPE derivative, 1-(3-chloromethylphenyl)-1-((3-(1-phonyletheny1)phenyl) ethylene, capable of introducing two DPE functionalities via one DPE anion reaction site in the reaction (b). The number of arm segments of the star-branched polymer synthesized by the methodology could be dramatically increased to 2, 6, and up to 14 by repeating the iterative process.
A Case of Suspicious Allergic Reaction to Peracetic Acid Following Endoscopy
Naohiko Harada,Manami Hirowatari,Eikichi Ihara,Etsuko Ishihara,Mitsuko Inoue,Tomoya Miyamura,Makoto Nakamuta 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.6
A 43-year-old man with rheumatic arthritis was admitted to our hospital for symptoms of cough, left chest pain, and leftelbow pain, and further examination revealed an elevated level of C-reactive protein. On day 2 after admission, he underwentesophagogastroduodenoscopy. On the morning of day 7, he developed a high fever of 39.7°C, several hours after bronchoscopy. Onday 13, he underwent colonoscopy. Five minutes after the colonoscopy, he developed a high fever of 39.9°C, accompanied by stridor,indicating a decrease in arterial oxygen saturation level. An intradermal test for peracetic acid which was used for cleaning flexibleendoscopy was positive. We suspect that he suffered from an allergic reaction to peracetic acid following the flexible endoscopy. This is the first case reported on suspicious allergic reaction to peracetic acid following a flexible endoscopy procedure.