WebFeb 15, 2007 · We investigated the separation and recovery of dimethylnaphthalene (DMNA) isomers by distillation‐extraction combination as the pretreatment … WebCoordinate system and atom numbering of dimethylnaphthalene (DMN) isomers. The main focus of this study is to determine the static and frequency-dependent electronic …
Process for producing 2,6-dimethylnaphthalene - Google
WebAug 15, 2007 · The equilibrium distribution of dimethylnaphthalene isomers in the mixture is predicted using the calculated entropies and energies from QM and SM calculations in the 300 K to 740 K temperature range. † University of Tennessee. * Corresponding author. Telephone: (865) 974-5322. E-mail: dkeffer@ utk.edu. § Oak Ridge National Laboratory. … WebJan 24, 2007 · Geometries, relative stabilities, electronic excited states, atomic charges, and electronic dipole polarizabilities of dimethylnaphthalene (DMN) isomers have been calculated in gas and aqueous phases by ab initio and DFT methods. docuworks 7.2 アップグレード
Separation of Isomers on Nematic Liquid Crystal Stationary
Dehydrogenation then provides 1,5-dimethylnaphthalene (1,5-DMN, 5). Finally, 1,5-DMN is isomerized to 2,6-DMN (6). In the final step, other mono-, di-, and tri-methylnaphthalenes are formed. More work is therefore required in separation of the mixture, which is done by selective crystallization. See more 2,6-Dimethylnaphthalene (2,6-DMN) is a polycyclic aromatic hydrocarbon. It is one of the ten dimethylnaphthalene isomers, which are derived from naphthalene by the addition of two methyl groups. See more 2,6-Dimethylnaphthalene is mainly used for the preparation of 2,6-naphthalenedicarboxylic acid by oxidation of 2,6-dimethylnaphthalene in the liquid phase. 2,6 … See more Alkylated naphthalenes (methyl-, dimethyl-, and poly-methyl naphthalenes, thus including 2,6-DMN) are found in low concentrations in crude oil and coal tar. Separation is difficult, expensive, and requires a number of operations such as selective … See more WebOct 1, 2004 · However, 26DMN presents as isomeric mixtures which are difficult to separate due to the close properties of dimethylnaphthalene isomers. The most difficult separation occurs between 26DMN and 2,7-dimethylnaphthalene (27DMN). Several efforts have been done to separate 26DMN from its isomers. WebThe quantitative analysis of dimethylnaphthalene isomers by gas chromatography mass spectrometry Ray, Ronald Nathaniel, Jr . Mississippi State University ProQuest … docuworks7.2 ダウンロード