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Development of Chemical Accident Classification Codes and Tool for Management in Process Industries
Jang, Namjin,Han, Kyusang,Koo, Jamin,Yoon, Yi,Yong, Jongwon,Yoon, En Sup The Society of Chemical Engineers, Japan 2009 Journal of chemical engineering of Japan Vol.42 No.10
<P>In this study, domestic and international chemical accident databases are analyzed, and a chemical accident reporting system is developed using chemical accident classification codes. These codes are revised by adopting the data collected in 2115 cases of chemical accidents that occurred in S. Korea over the last 20 years. The revised classification codes are composed of 12 upper, 64 middle, and 276 lower classes. The developed database is composed of data input, data list, and data search modules as well as statistic and analysis modules. Module operations help obtain information on relationships between accident data attributes that are not apparent, in addition to simple statistical results. The chemical accident tracking system is available on the Internet, and the data are treated using an on-line analytical system. The records are statistically analyzed to identify type of accidents that occurs frequently in Korean chemical companies, as well as the accident data and materials involved. We expect the results of this study to be useful in reporting for developing a management of system for prevention of chemical accidents, and improve the manageability of the designed system.</P>
Liang, Hui,Na, Young Mee,Chun, In Sung,Kwon, Soon Sik,Lee, Young-A,Jung, Ok-Sang Chemical Society of Japan 2007 Bulletin of the Chemical Society of Japan Vol.80 No.5
<P>Dinuclear 1,2-semiquinonato/catecholatocobalt complexes containing 1,1,4,7,10,10-hexamethyltriethylenetetramine (hmdeta) as a potential tetradentate N<SUB>4</SUB> coligand, [Co<SUB>2</SUB>(hmteta)(dbbq)<SUB>4</SUB>], (dbbq = 3,5- and 3,6-di-<I>tert</I>-butyl-1,2-benzoquinone (3,5-dbbq and 3,6-dbbq)) were synthesized and characterized. The crystal structures proved that [Co<SUB>2</SUB>(hmteta)(3,6-dbbq)<SUB>4</SUB>]·2C<SUB>6</SUB>H<SUB>5</SUB>CH<SUB>3</SUB> ([3,6]) exists as low spin [(3,6-dbsq)(3,6-dbcat)Co<SUP>III</SUP>(hmteta)Co<SUP>III</SUP>(3,6-dbsq)(3,6-dbcat)] (3,6-dbsq = 3,6-di-<I>tert</I>-butyl-1,2-semiquinonato; 3,6-dbcat = 3,6-di-<I>tert</I>-butylcatecholato), while [Co<SUB>2</SUB>(hmteta)(3,5-dbbq)<SUB>4</SUB>]·C<SUB>6</SUB>H<SUB>5</SUB>CH<SUB>3</SUB> ([3,5]) approximates to [(3,5-dbsq)<SUB>2</SUB>Co<SUP>II</SUP>(hmteta)Co<SUP>II</SUP>(3,5-dbsq)<SUB>2</SUB>] in the solid state at ambient temperature. On the basis of the effective magnetic moments, the [Co<SUP>III</SUP>] → [Co<SUP>II</SUP>] conversion of [3,6] underwent a relatively abrupt transition around 330 K while that of [3,5] occurs in a wide range of temperature. Electronic absorption spectra showed that [3,6] shifts predominantly to [Co<SUP>III</SUP>] whereas [3,5] shifts to [Co<SUP>II</SUP>] valence tautomer in solution at room temperature. The charge distribution of [3,6] exhibited significant solvent effects at room temperature. These prominent features between [3,5] and [3,6] appeared to be associated with difference between delicate electronic and steric effects of the two dbbq ligands.</P>
X-ray Direct Observation of Reactions and Labile Species on the Basis of Crystal Design
Chemical Society of Japan 2014 Bulletin of the Chemical Society of Japan Vol. No.
This account reviews recent development of in situ crystallographic study of reactive intermediates using the cryo-trapping method. Starting from the basic concept of a reaction cavity in a crystal, we succeeded in not only observing photoinduced reactive species such as radical, carbene, and nitrene but also establishing a unique approach, crystalline molecular flask, to observe labile species in chemical reactions in a crystal. On the basis of such a crystalline reaction field design, we successfully observed irreversible reactive intermediates in a crystal.
Synthesis and Characterization of Dendritic Pt Nanoparticles by Using Cationic Surfactant
Kani, Kenya,Zakaria, Mohamed B.,Lin, Jianjian,Alshehri, Abdulmohsen Ali,Kim, Jeonghun,Bando, Yoshio,You, Jungmok,Hossain, Md Shahriar A.,Bo, Jiang,Yamauchi, Yusuke Chemical Society of Japan 2018 Bulletin of the Chemical Society of Japan Vol. No.