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Received October 29, 2010
Accepted November 23, 2010
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젖산회수를 위한 분리벽형 반응증류탑의 제어
Control of Reactive Dividing Wall Column for the Recovery of Lactic Acid
충남대학교 화학공학과, 305-764 대전광역시 유성구 궁동 220번지
Department of Chemical Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon 305-764, Korea
mwhan@cnu.ac.kr
Korean Chemical Engineering Research, June 2011, 49(3), 306-313(8), NONE Epub 8 June 2011
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Abstract
젖산(lactic acid)은 식품, 의약품, 화학약품 등의 원료로서 많이 사용되고 있으며, 생분해성 고분자 (biodegradable polymer)인 폴리젖산(polylactic acid)의 원료로서 최근 사용량이 증가하고 있다. 하지만 고비점 물질의 존재와 젖산의 비휘발성은 젖산 분리 및 정제를 어렵게 만든다. 이를 극복하기 위해 분리벽형 반응 증류를 이용하여 비휘발성 물질인 젖산을 에스테르화 반응에 의하여 휘발성이 있는 물질로 전환시킨 후 분리하고 가수분해반응을 이용하여 다시 젖산으로 전환하여, 회수하는 공정을 제안하였다. 제안된 연속적인 젖산회수 분리벽형 반응증류공정의 동특성을 조사하여, 이를 바탕으로 제어계들을 구성하였고 각 제어계들의 성능을 비교하였다.
Lactic acid is widely used in the food, chemical and pharmaceutical industries, and there is an increasing demand for lactic acid as the raw material of polylactic acid, which is a biodegradable polymer. The presence of high boilers and non volatility of lactic acid makes the separation of lactic acid very difficult job. Esterification of lactic acid with methanol followed by hydrolysis of the separated methyl lactate was employed for the recovery of lactic acid. Reactive dividing wall column was proposed for the simultaneous reaction and separation. The intensified process poses a challenging control problem. Dynamic characteristics of the proposed process were examined and control systems were proposed to get a stable control performance for a disturbance in feed. Control performances of the proposed control systems were compared.
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Kumar R, Mahajani SM, Ind. Eng. Chem. Res., “Esterification of Lactic acid with n-butanol by Reactive Distillation", 46(21), 6873 (2007)
Kim J, Kim Y, Hong W, Biotechnol. Bioprocess Eng., “Recovery Process of Lactic Acid Using Two Distillation Columns", 5, 196 (2000)
Woo D, Cho Y, Kim BK, Hwang H, Han M, Korean Chem. Eng. Res., "Recovery of Lactic Acid Using Reactive Dividing Wall Column", 48(3), 342 (2010)
Sanz MT, Murga R, Beltran S, Cabezas JL, Coca J, Ind. Eng. Chem. Res., “Kinetic Study for the Reactive System of Lactic Acid Esterification with Methanol: Methyl Lactate Hydrolysis Reaction", 43(9), 2049 (2004)
Asthana N, Kolah A, Vu DT, Lira CT, Miller DJ, Organic Process Research & Development., “A Continues Reactive Separation Process for Ethyl Lactate Formation", 9, 599 (2005)
