| 反应与催化精馏耦合提纯乳酸新工艺的研究 |
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| 引用本文： | 马利, ,张阳, ,杨基础. 反应与催化精馏耦合提纯乳酸新工艺的研究[J]. 中国化学工程学报, 2005, 13(1): 24-31 |
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| 作者姓名： | 马利 张阳 杨基础 |
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| 作者单位： | DepartmentofChemicalEngineering,TsinghuaUniversity,Beijing100084,China |
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| 基金项目： | SupportedbyNationalKeyTechnologiesR&DProgramofChina(NKTRDP2001BA708B01-01). |
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| 摘 要： | The purification of lactic acid based on the esterification of raw lactic acid from fermentation broth and then the catalytic distillation hydrolysis of methyl lactate simultaneously to achieve pure lactic acid is reported. The esterification kinetics of lactic acid with methanol catalyzed by strong-acid cation-exchange resins (Amberlyst-15,D001, D002, NKC, 002) was studied under the condition that simulates the real catalytic environment. Experimental results were correlated by a Langmuir-Hinselwood model and the nonideality of the solution was taken into account by using activities calculated by the universal quasichemical functional group activity coefficient (UNIFAC) method.A good agreement between the model and the experimental data was achieved. Continuous purification experiments were conducted to find the optimum column configuration and operation condition for the system. The effects of various parameters, e.g. the length of different section of the column, feed rate and ratio of reactants, packing material and catalyst type, were studied. This novel system shows good separation results in lab scale, and is potential for industrial application.
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| 关 键 词： | 乳酸 接触反应 蒸馏法 离子交换树脂 净化工艺 |
| 修稿时间： | |
Purification of Lactic Acid by Heterogeneous Catalytic Distillation Using Ion-exchange Resins |
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| MA Li,ZHANG Yang,YANG Jichu. Purification of Lactic Acid by Heterogeneous Catalytic Distillation Using Ion-exchange Resins[J]. Chinese Journal of Chemical Engineering, 2005, 13(1): 24-31 |
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| Authors: | MA Li ZHANG Yang YANG Jichu |
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| Affiliation: | Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | The purification of lactic acid based on the esterification of raw lactic acid from fermentation broth and then the catalytic distillation hydrolysis of methyl lactate simultaneously to achieve pure lactic acid is reported. The esterification kinetics of lactic acid with methanol catalyzed by strong-acid cation-exchange resins (Amberlyst-15, D001, D002, NKC, 002) was studied under the condition that simulates the real catalytic environment. Experimental results were correlated by a Langmuir-Hinselwood model and the nonideality of the solution was taken into account by using activities calculated by the universal quasichemical functional group activity coefficient (UNIFAC) method. A good agreement between the model and the experimental data was achieved. Continuous purification experiments were conducted to find the optimum column configuration and operation condition for the system. The effects of various parameters, e.g. the length of different section of the column, feed rate and ratio of reactants, packing material and catalyst type, were studied. This novel system shows good separation results in lab scale, and is potential for industrial application. |
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| Keywords: | lactic acid catalytic distillation purification ion-exchange resin hydrolysis |
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