Fischer‐tropsch synthesis in bubble column slurry reactors on FE/K‐catalyst

Abstract

Fischer-Tropsch synthcsis (FTS) on K promoted Fe catalyst was studied in three bubble column slurry reactors (BCSR) of 2.5. 5 , and 10 cm diameter. The objective was to check data reproducibility under conditions of arbitrary alterations of various parameters. First order rate constants evaluated on the basis of appropriate slurry reactor models were chosen as an approximate measure to characterize data reproducibility and catalyst activity. It was found that rate constants and hence reproducibility may differ by a factor of two if different batches and precipitations of catalyst are considered. Within the parameter ranges covered in this study this rule of thumb is valid irrespective of reactor diameter, type of sparger, catalyst concentration, temperature, pressure, and gas flow rate. The rate constants compare well with literature data.On a ktudi6 la synthkse Fischer-Tropsch sur un catalyseur au Fe active par le K dans trois rkacteurs a colonnes 21 bulles et suspension dont les diamktres Ctaient respectivement 2.5, 5 et 10 cm. L'objectif du travail ktait de vkrifier la reproductibilitk des rksultats dans des conditions de perturbations arbitraires de divers paramktres. On a choisi, comme mesure approximative servant a caractkriser la reproductibilitk des donnCes et I'activitk du catalyseur, des constantes de vitesse de premier ordre kvalukes I'aide de modkles de rkacteurs a suspension appropriks. On a constatk que les constantes de vitesse donc la reproductibilitk peuvent differer d'un facteur 2 , si I'on considkre diffkrents lots du catalyseur. Dans les limites des gammes des parametres couvertes dans la prksente etude, cette rkgle empirique est valable, indkpendamment du diamktre du rkactcur, du type de barboteur, de la concentration du catalyseur, de la temp&ature, de la pression et du dkbit de gaz. Les constantes de vitesse se comparent bien avec celles donnkes dans la littkrature. n the second wave of research on the Fischer-Tropsch

Fischer-tropsch synthesis in a stirred tank slurry reactor

“…Several pilot plant slurry bubble columns have been constructed and operated in recent years (e.g. Deckwer et al, 1982;Kuo, 1983Kuo, , 1985Sanders et al, 1986). Although this type of reactor appears to be the most likely candidate for future commercialization of the slurry Fischer-Tropsch (F-T) process, it is not suitable for more fundamental studies due to its complex hydrodynamic behavior, which changes with the reactor size.…”

“…The stirred tank slurry reactor has been used for studies of the F-T synthesis by several investigators (e.g. Dyer et al, 1982a, b;Satterfield and Huff, 1982 a, b;Huff and Satterfield, 1984a, b;Stenger and Satterfield, 1985;Nettelhoff et al, 1985;Deckwer et al, 1986).…”

Performance of catalytic reactors for the hydrogenation of CO2 to hydrocarbons

“…Our previous studies reported that impregnated Fe-K/Al 2 O 3 and co-precipitated Fe-Cu-Al-K catalysts gave a relatively high CO 2 conversion as well as high selectivity of olefins and long chain hydrocarbons in fixed bed reactors [11][12][13][14][15][16][17][18]. Recently, Fischer-Tropsch synthesis in fluidized bed or three-phase slurry reactors has been extensively investigated [19][20][21][22][23][24][25] because of its numerous advantages such as effective removal of heat generated from the exothermic reaction and high productivity of hydrocarbons due to effective contact among the reacting phases with higher heat and mass transfer rate and ease of continuous operation mode compared to the other contacting modes [24][25][26]. Thus, fluidized bed or slurry reactor can be expected to function as an effective system for the hydrogenation of CO 2 .…”

Untersuchungen zur Modellbildung der Fischer‐Tropsch‐Synthese in Suspensionsblasensäulen

“…Statt dessen sollte jedoch eine Inhibierung durch CO, Beriicksichtigung finden. Um dies nachzuweisen, wurden in der von Sunders et al [3] beschriebenen MeRanlage mit einer Blasensaule von 10 cm Durchmesser Synthesegas-Umsatze an einem K-promotierten Fe-Fallungskatalysator gemessen. Dabei wurde bei einer hohen Katalysator-Konzentration (ca.…”

“…Ordnung in H, ausgewertet, wobei unterschiedliche fluiddynamische Modelle unter Beriicksichtigung der Stofftransporthemmung an der Gas/Flussigkeits-Grenzflache angesetzt wurden. Dabei zeigte sich in Ubereinstimmung mit Sunders et al [3], daR das Vermischungsverhalten der Suspensionsphase (unvermischt, k', bzw. vollstandig vermischt, ky) fur die Ermittlung der Geschwindigkeitskonstanten k, 1.…”