کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6308729 1618860 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanistic aspects of the nucleophilic substitution of pectin. On the formation of chloromethane
ترجمه فارسی عنوان
جنبه های مکانیکی جایگزینی نوکلئوفیلی پکتین. در تشکیل کلر متیان
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی
Chloromethane, accounting for approximately 16% of the tropospheric chlorine, is mainly coming from natural sources. However anthropogenic activities, such as combustion of biomass may contribute significantly as well. The present study focuses on the thermal solid state reaction between pectin, an important constituent of biomass, and chloride ions as found in alkali metal chlorides. The formation of chloromethane is evident with the amount formed being linear with respect to chloride if pectin is in great excess. Thus the reaction is explained as a pseudo first order SN2 reaction between the chloride ion and the methyl ester moiety in pectin. It is suggested that the polymeric nature of pectin plays an active role by an enhanced transport of halides along the carbohydrate chain. Optimal reaction temperature is around 210 °C. At higher temperatures the yield of chloromethane decreases due to a thermal decomposition of the pectin. The possible influence of the type of cation is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 111, September 2014, Pages 575-579
نویسندگان
, , , ,