title: Improvement of the performances of a tandem simulated moving bed chromatography by controlling the yield level of a key product of the first simulated moving bed unit.
abstract: One of the trustworthy processes for ternary separation is a tandem simulated moving bed (SMB) process, which consists of two subordinate four-zone SMB units (Ring I and Ring II). To take full advantage of a tandem SMB as a means of recovering all three products with high purities and high economical efficiency, it is important to understand how the separation condition in Ring II is affected by that in Ring I, and further to reflect such point in the stage of designing a tandem SMB. In regard to such issue, it was clarified in this study that the Ring I factors affecting the Ring II condition could be represented by the yield level of a key product of Ring I (YkeyRingI). As the YkeyRingIlevel became higher, the amount of the Ring I key-product that was reloaded into Ring II was reduced, which affected favorably the Ring II separation condition. On the other hand, the higher YkeyRingIlevel caused a larger dilution for the stream from Ring I to Ring II, which affected adversely the Ring II separation condition. As a result, a minimum in the desorbent usage of a tandem SMB occurred at the YkeyRingIlevel where the two aforementioned factors could be balanced with each other. If such an optimal YkeyRingIlevel was adopted, the desorbent usage could be reduced by up to 25%. It was also found that as the throughput of a tandem SMB became higher, the factor related to the migration of the Ring I key-product into Ring II was more influential in the performances of a tandem SMB than the factor related to the dilution of the stream from Ring I to Ring II.
authors.affiliation: Department of Chemical Engineering, Hanyang University, Haengdang-dong, Seongdong-gu, Seoul, 04763, South Korea. Electronic address: munsy@hanyang.ac.kr.
authors.forename: Sungyong
authors.initials: S
authors.lastname: Mun
authors.affiliation: School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, IN 47907-2100, USA.
authors.forename: Nien-Hwa Linda
authors.initials: NL
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D002845:Chromatography / Q000295:instrumentation* / Q000379:methods*; D003198:Computer Simulation; D012996:Solutions
chemical_list: D012996:Solutions
keywords: Optimal design; Simulated moving bed chromatography; Tandem SMB; Ternary separation; Yield level