화학공학소재연구정보센터
Energy & Fuels, Vol.23, 4449-4459, 2009
Nitrogen-Rich Natural Gases as a Potential Direct Feedstock for Some Novel Methane Transformation Processes. Part 2: Non-oxidative Processes
In this work (parts 1 and 2), we examined the chances for the future use of nitrogen-rich natural gases (NRNGs), without separation and nitrogen removal, as a direct feedstock in some novel CH4 conversion processes, In part 1, the absence of the effect of the N-2 content in CH4 on the course and results Of Such irreversible oxidative processes as methane oxidative coupling and methane and toluene oxidative cross coupling were shown. In the present part 2, the possibility to use NRNGs as a direct feedstock in some non-oxidative processes of methane dehydroaromatization (MDA) to H, and aromatics and of methane catalytic decomposition (MCD) to H-2 and carbon was examined. Various CH4-N-2 and CH4-N-2-(C-2-C-4) mixtures of different composition, modeling some degasolined, raw dry and wet NRNGs, containing up to about 80 vol % of N2 were used in investigations. Experiments with C2H6-N-2, C3H8-N-2, C4H10- N-2, and (C-2-C-4)-N-2 mixtures were also performed. It was revealed that, in tile reversible processes of MDA and MCD, proceeding with the increase in the number of moles, the increase in the N-2 concentration led to tile rise in the CH4 conversion and yields of desirable products, presumably because of the equilibrium shift. The effects of CH4 homologus oil the Yields of products and stability of the catalyst were also examined. It was concluded that NRNGs of different N2 content and hydrocarbon composition (degasolined and raw dry and wet) can be considered in the future as a direct feedstock in both the oxidative-oxidative-methane transformation processes. A demonstrated absence of specific technological and non obstacles for a direct use of non-separated NRNGs as a feedstock in the investigated novel processes indicated that their future industrial chances would only depend upon the results of the cost-effective analyses and the further advancement of novel processes.