Separation of Fischer-Tropsch Wax Products from Ultrafine Iron Catalyst Particles

Neathery, James K. ; Jacobs, Gary ; Sarkar, Amitava ; Davis, Burtron H.

University of Kentucky. Research Foundation.

关键词: Filtration;    01 Coal, Lignite, And Peat;    Separation Processes;    Catalysts;    32 Energy Conservation, Consumption, And Utilization;   

DOI  :  10.2172/901639
RP-ID  :  None
RP-ID  :  FC26-03NT41965
RP-ID  :  901639

美国|英语

来源: UNT Digital Library

【 摘 要 】

The morphological and chemical nature of ultrafine iron catalyst particles (3-5 nm diameters) during activation/FTS was studied by HRTEM, EELS, and Moessbauer spectroscopy. With the progress of FTS, the carbide re-oxidized to magnetite and catalyst activity gradually decreased. The growth of oxide phase continued and average particle size also increased simultaneously. The phase transformation occurred in a ''growing oxide core'' manner with different nano-zones. The nano-range carbide particles did not show fragmentation or attrition as generally observed in micrometer range particles. Nevertheless, when the dimension of particles reached the micrometer range, the crystalline carbide phase appeared to be sprouted on the surface of magnetite single crystal. In the previous reporting period, a design and operating philosophy was developed for an integrated wax filtration system for a 4 liter slurry bubble column reactor to be used in Phase II of this research program. During the current reporting period, we have started construction of the new filtration system and began modifications to the 4 liter slurry bubble column reactor (SBCR) reactor. The system will utilize a primary wax separation device followed by a Pall Accusep or Membralox ceramic cross-flow membrane. As of this writing, the unit is nearly complete except for the modification of a moyno-type pump; the pump was shipped to the manufacturer to install a special leak-free, high pressure seal.