Origin of Impurities Formed in the Polyurethane Production Chain. 1. Conditions for Chlorine Transfer from an Aryl Isocyanide Dichloride Byproduct

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• 作者：June Callison ; Ruth Edge ; Kimberly R. de Cuba ; Robert H. Carr ; Joseph J. W. McDouall ; David Collison ; Eric J. L. McInnes ; Willem van der Borden ; Klaas van der Velde ; John M. Winfield ; David Lennon
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：February 15, 2012
• 年：2012
• 卷：51
• 期：6
• 页码：2515-2523
• 全文大小：392K
• 年卷期：v.51,no.6(February 15, 2012)
• ISSN：1520-5045

文摘

Phenyl and 4-methylphenyl isocyanide dichlorides are models for byproduct that may be formed in the later stages of certain polyurethane production chains. Photochemical electron paramagnetic resonance (EPR) studies (位 > 310 nm), using the spin trap, N-tert-butyl-伪-phenylnitrone, confirm a previously made suggestion that ArN鈺怌Cl₂ can behave as a chlorine radical source. EPR spectra recorded during and after irradiation and supported by simulations evolve over time and indicate formation of the short-lived spin trap鈥揅l^{鈥?/sup> adduct and a longer lived benzoyl-N-tert-butylnitroxide radical. Photolysis of C₆H₅N鈺怌Cl₂, either alone or mixed with methylene diaryl isocyanate species, in o-C₆H₄Cl₂, a polyurethane process solvent, led to the formation of mixtures containing dichloro- and trichlorobiphenyl isomers.}