摘要
通过筛选,得到大孔吸附树脂NKA-II,并用其对乳酸进行分离.测定了该树脂对乳酸与谷氨酸的吸附选择系数,得到了乳酸在NKA-II上的吸附等温线,并对其吸附动力学和动态吸附进行了研究.结果表明,NKA-II对乳酸和谷氨酸的吸附选择系数KGL=16.19.该树脂对乳酸的吸附等温线符合Freundlich方程,在26和48℃下的相关系数R2均大于0.99,方程的特征参数n>1,属'优惠吸附'.吸附动力学研究表明,粒内扩散是吸附过程的主要控制步骤,符合Kannan-Sundaram粒内扩散模型,相关系数R2=0.9906,粒内扩散速率常数kp=6.0129mg·min0.5/g.动态吸附实验结果表明,乳酸的穿透体积比谷氨酸大110.6mL,故该树脂可以成功地应用于乳酸与谷氨酸的分离.
The macroporous resin adsorbent NKA-Ⅱ was selected to separate lactic acid from the residual solution of fermentation. Adsorption behavior and selectivity of NKA-Ⅱ were studied by using static and dynamic adsorption methods, including the static equilibrium adsorption and adsorption thermodynamic properties. The results showed that the adsorbent selectivity coefficient （KG^L） of lactic acid and glutamic acid equaled to 16.19. The adsorption data were correlated with Freundlich isotherm equation, and the correlative coefficients （R^2） all exceeded 0.99 at 26 and 48 ℃. Characteristic parameter of this equation n〉1. Besides, the kinetics of adsorption of NKA-Ⅱ was mainly controlled by intra-particle diffusion, and it fit well into the Kannan-Sundaram intra-particle diffusion model. The intra-particle diffusion rate coefficient kp was 6.0129 mg.min^0.5/g. Dynamic adsorption results showed that the breakthrough volume of L-lactic acid was 140.6 mL, being 110.6 mL over the breakthrough volume of glutamic acid. So macroporous adsorbent NKA-Ⅱ could be employed as the sorbent to separate lactic acid and glutamic acid.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2007年第4期767-772,共6页
The Chinese Journal of Process Engineering
基金
中国科学院知识创新工程重要方向基金资助项目(编号:KSCXZ-YW-G-020)
关键词
大孔吸附树脂
乳酸
吸附
谷氨酸
macroporous adsorbent
lactic acid
adsorption behavior
glutamic acid
