Modeling on a Modified Feeding Mode of Simulated Moving Bed for Improving Productivity

Abstract

Abstract: A new feeding mode for a simulated moving bed(SMB) is proposed.The outlet stream from zone Ⅱ is collected at regular intervals.The concentration of the solution is increased by dissolving raw materials and then fed to zone Ⅲ as the feed stream during the next collection interval.In this feeding mode,the concentration of the stream fed to zone Ⅲ is identical to that of original feed,while in a conventional SMB,the feed is diluted by mix-ing with the outlet stream of zone Ⅱ before feeding to zone III.The new feeding mode increases the inlet concentra-tion of zone Ⅲ.A modeling investigation shows that higher inlet concentration of zone Ⅲ increases the height of concentration band in SMB,improving the separation performance significantly.In comparison with the traditonal feeding mode,the new feeding mode increases the productivity by 23.52% and decreases the solvent consumption by 22.56%,so as to increase the raffinate and extract concentrations by 53.17% and 20.38%,respectively.The col-lection interval for the outlet stream from zone Ⅱ has no effect on the separation performance after reaching the steady state,so that the collection interval can be increased to make the operation more convenient.

Key words: simulated moving bed, feeding mode, modified operation, simulation

摘要： A new feeding mode for a simulated moving bed(SMB) is proposed.The outlet stream from zone Ⅱ is collected at regular intervals.The concentration of the solution is increased by dissolving raw materials and then fed to zone Ⅲ as the feed stream during the next collection interval.In this feeding mode,the concentration of the stream fed to zone Ⅲ is identical to that of original feed,while in a conventional SMB,the feed is diluted by mix-ing with the outlet stream of zone Ⅱ before feeding to zone III.The new feeding mode increases the inlet concentra-tion of zone Ⅲ.A modeling investigation shows that higher inlet concentration of zone Ⅲ increases the height of concentration band in SMB,improving the separation performance significantly.In comparison with the traditonal feeding mode,the new feeding mode increases the productivity by 23.52% and decreases the solvent consumption by 22.56%,so as to increase the raffinate and extract concentrations by 53.17% and 20.38%,respectively.The col-lection interval for the outlet stream from zone Ⅱ has no effect on the separation performance after reaching the steady state,so that the collection interval can be increased to make the operation more convenient.

关键词: simulated moving bed, feeding mode, modified operation, simulation

WEI Feng, SHEN Bo, CHEN Mingjie, ZHAO Yingxian, SHAO Liping. Modeling on a Modified Feeding Mode of Simulated Moving Bed for Improving Productivity[J]. , 2010, 18(2): 239-243.

危凤, 沈波, 陈明杰, 赵迎宪, 邵立平. Modeling on a Modified Feeding Mode of Simulated Moving Bed for Improving Productivity[J]. , 2010, 18(2): 239-243.

References

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