醇类在芳烃溶剂中的缔合溶液热力学  

Thermodynamics Study on Self-Association of Alcohols in Aromatics by Freezing Point Depression

作　　者：裘利言[1] 郑国康[1] 周效贤[1] 陈武锋 

机构地区：[1]兰州大学化学系,兰州730000

出　　处：《化学学报》1991年第6期557-560,共4页Acta Chimica Sinica

基　　金：国家自然科学基金资助的项目

摘　　要：用凝固点降低法测量了在C_1—C_4醇类的各异构物分别存在下,苯和对二甲苯溶剂的活度系数γ_B.用Wiehe-Bagley(WB)模型对数据进行了处理,得到各醇的自缔合常数K_A及无限稀活度系数γ_A~∞.在同一溶剂中,K_A依下列顺序减小:甲醇>乙醇>正丙醇>正丁醇;正丙醇>异丙醇;正丁醇>异丁醇>叔丁醇≥仲丁醇.各醇在对二甲苯中的K_A均大于相应的在苯中的K_A.The solvent activity coefficients γ_b of binary mixtures have been measured for C_1 to C_4 alcohols in benzene and in p-xy e(?)e by freezing point depression. The data was treated with Wiehe-Bagley association model combining with a Hildebrand-Scatchard term. The association constants K_A and infinite dilution activity coefficients γ_A~∞ of alcohols have been evaluated. It is found that the K_A of alcohols in each solvent follow the order, methanol>ethanol>n-propanol>n-butanol; n-propanol>iso-propanol; n-butanol>iso-butanol>tert-butanol≥sec-butanol. And the value of K_A of each alcohol in p-xylene is greater than in benzene. The γ_A~∞ of alcohols in each solvent decrease in the following order, methanol>ethanol>n-propanol>n-butanol; n-propanol>isobutanol. And the value of γ_A~∞ of each al(?)hol in benzene is greater than in p-xylene.

关 键 词：醇类 芳烃 溶剂 缔合 溶液热力学 

分 类 号：O645.164[理学—物理化学]