| 流动电势法对L-谷氨酸水溶液结晶过程的表征 |
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| 引用本文： | 王建,马卫兴,刘玮炜,许兴友,陆路德,杨绪杰.流动电势法对L-谷氨酸水溶液结晶过程的表征[J].北京化工大学学报(自然科学版),2010,37(3):41-45. |
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| 作者姓名： | 王建 马卫兴 刘玮炜 许兴友 陆路德 杨绪杰 |
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| 作者单位： | 1 淮海工学院 化工学院，江苏 连云港 222005;2 南京理工大学 化工学院，江苏 南京210094;3 淮阴工学院，江苏 淮安 223003 |
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| 基金项目： | 江苏省教育厅自然科学基金，江苏省"六大人才高峰"项目，连云港市科技攻关计划项目，淮海工学院博士科研启动项目 |
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| 摘 要： | 以流动电势法研究L-谷氨酸饱和水溶液的降温结晶过程,考察了溶液起始温度和酸度对结晶过程中流动电势(ν)-结晶器温度(t)曲线的影响。结果表明:起始温度为15℃的L-谷氨酸饱和溶液在较高酸度条件(pH3.5)下成核明显,25℃下等电点附近有成核能力,30℃下在不同酸度下均显示一定的成核能力;pH=2.5、pH=3.5的L-谷氨酸饱和溶液,只在起始温度15℃下可形成晶核;pH=3.0的饱和溶液在起始温度25和30℃下可有效地形成晶核。运用生长基元理论对此结晶过程进行了分析。
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| 关 键 词： | L-谷氨酸 结晶 流动电势 成核 表征 |
| 收稿时间： | 2009-11-24 |
Characterization of the crystallization of L-glutamic acid by streaming potential measurements |
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| WANG Jian,MA WeiXing,LIU WeiWei,XU XingYou,LU LuDe,YANG XuJie.Characterization of the crystallization of L-glutamic acid by streaming potential measurements[J].Journal of Beijing University of Chemical Technology,2010,37(3):41-45. |
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| Authors: | WANG Jian MA WeiXing LIU WeiWei XU XingYou LU LuDe YANG XuJie |
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| Institution: | 1. College of Chemical Engineering, Huaihai Institute of Technology, Lianyungang Jiangsu 222005; 2. College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing Jiangsu 210094; 3. Huaiyin Institute of Technology, Huaian Jiangsu 223003, China |
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| Abstract: | The streaming potentials of saturated solutions of L-glutamic acid (L-Glu) were determined in order to characterize the crystallization occurring during a cooling process. The influence of varying the initial temperature and solution acidity on the v-t curves were investigated. The results showed that: saturated solutions of L-Glu with relatively high acidity (pH<3.5)had a distinct nucleating ability at an initial temperature of 15℃;solutions with an initial temperature of 25℃ showed competitive nucleating ability at or near the acidity of the isoelectric point;solutions with an initial temperature of 30℃ showed a certain nucleating ability which depended on the acidity.Saturated solutions of L-Glu with pH=2.5 and pH=3.5 could form crystal nuclei only when the initial temperature was 15℃; a solution with acidity pH=3.0 could efficiently form crystal nuclei at initial temperatures of 25℃ and 30℃. Growth unit theory can be employed to explain this crystallizing process. |
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| Keywords: | L-Glutamic acid crystallization streaming potential crystal nucleus characterization |
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