Combined reforming (CR) and dry reforming (DR) of methane are two of the most promising CO2 conversion reactions for utilizing concentrated CO2 as a feedstock to produce syngas, which is used in various applications like liquid fuel synthesis.[1,2] In order to make these conversion processes more economically attractive, it is important to procure CO2 feed as cheaply as possible. Steam methane reforming (SMR) based hydrogen pl ant in typical refineries is a suitable CO2 emission source to target for this because there are process streams containing CO2 at high partial pressure, giving potentials for an acceptably low CO2 avoidance cost ($/ton of CO2). The aim of this study is to compare various processing options for removing CO2 in a SMR-H2 plant and supplying it to the two CO2 conversion processes, employing the combined reforming and dry reforming of methane, respectively. As the technological candidates, three CO2 capture technologies applied to the H2 purification unit upstream are considered: physical absorption (1-stage Selexol), chemical absorption (activated MDEA), and adsorption (Vacuum Swing Adsorption). In addition, the applicability of directly feeding the a CO2 containing output stream of the H2 purification into the CO2 conversion processes is examined, an option that does not require any CO2 capture facility. Methanol and long-chain hydrocarbons are selected as final products of the CR based and the DR based CO2 conversion processes respectively because they guarantee the suitable syngas conditions for synthesizing the targeted products. Mass and energy balance information of each process is obtained by a commercial process simulator Aspen plus¢ç. To analyze the economic feasibility of each technological option, operating and capital costs are evaluated.
Figure 1. Four different strategies (three CO2 capture options & process stream direct use) for integrating the H2 plant with CO2 conversion processes
 Olah, G. A.; Goeppert, A.; Prakash, G. S., Beyond oil and gas: the methanol economy. John Wiley & Sons: 2009.
 Gadalla, A. M.; Bower, B., The role of catalyst support on the activity of nickel for reforming methane with CO2. Chemical Engineering Science 1988, 43 (11), 3049-3062
 Soltani, R.; Rosen, M. A.; Dincer, I., Assessment of CO2 capture options from various points in steam methane reforming for hydrogen production. International Journal of Hydrogen Energy 2014, 39 (35), 20266-20275