کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1198031 964673 2006 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The influence of phosphorus containing compounds on steam cracking of n-hexane
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
The influence of phosphorus containing compounds on steam cracking of n-hexane
چکیده انگلیسی

In steam cracking of hydrocarbons P-containing compounds are used as additives to control coke formation and/or CO production. However, information concerning the influence of P-containing compounds on the decomposition of hydrocarbons during steam cracking is scarce. In this study, the influence of three P-containing compounds, hexamethyl phosphoric triamide (HMPA), tripiperidinophosphine oxide (TPyPO) and dioctyl phenylphosphonate (DOPP), on the conversion of n-hexane during steam cracking was investigated in a continuous flow micro-reactor with complete mixing. All these compounds accelerate the thermal decomposition of n-hexane. The effect of a P-containing additive on the conversion of n-hexane is quantitatively evaluated using the dimensionless group method proposed by LaMarca et al. [C. LaMarca, C. Libanati, M.T. Klein, Chem. Eng. Sci. 45 (1990) 2059]. To interpret the accelerating effect, the potential elementary radical reactions involved in the steam cracking of these P-containing compounds are proposed. Their rate coefficients are estimated based on thermochemical data. For all of these P-containing compounds the main coupling with n-hexane decomposition occurs through H-abstraction reactions. The accelerated effect can be traced back to the introduction of new initiation steps. The evaluated values are consistent with the experimentally measured values.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Analytical and Applied Pyrolysis - Volume 77, Issue 2, October 2006, Pages 133–148
نویسندگان
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