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N,N-二仲辛基乙酰胺(DOAA)是一种新型萃取剂,它对苯酚有良好的萃取性能。本文系报道DOAA从水溶液中萃取苯酚机理的研究。测得DOAA萃取苯酚的等温线,计算了方程Y=aX~b中的常数(X和Y分别代表水相和有机相中苯酚的浓度)。DOAA萃取苯酚的分配比高达400以上。根据Clausius-Clapeyron方程测得萃取反应的焓变⊿H=-4.0千卡/克分子。采用双对数斜率法和连续变量法测得萃合物的组成为C_6H_5OH·DOAA。从负荷有机相的红外光谱观察到DOAA的羰基吸收峰移向低波数,说明DOAA羰基氧原子的缔合;同时从核磁共振谱观察到苯酚羟基的质子位移由于氢键缔合移向低场处。因此可以认为萃合物的结构为:C_6H_5O—H…O=(?)—H(secC_8H_(17))_2。
N, N-Di-sec-octylacetamide (DOAA) is a novel extractant that has good extraction properties for phenol. This paper reports the DOAA extraction of phenol from aqueous solution mechanism. The isotherms of DOAA extracted phenol were measured and the constants in the equation Y = aX ~ b were calculated (X and Y represent the concentrations of phenol in the aqueous and organic phases, respectively). DOAA extraction of phenol distribution ratio of up to 400 or more. The enthalpy change (⊿H = -4.0 kcal / mol) of the extraction reaction was measured according to the Clausius-Clapeyron equation. The double logarithmic slope method and continuous variable method were used to determine the composition of the extract as C_6H_5OH.dAA. From the IR spectra of the loaded organic phase, the carbonyl absorption peak of DOAA shifts to a low wave number, indicating the association of DOAA carbonyl oxygen atoms. At the same time, it was observed from NMR spectrum that the proton shift of the phenolic hydroxyl group was shifted to the low field due to hydrogen bonding . Therefore, the structure of the complex can be considered as: C_6H_5O-H ... O = (?) - H (secC_8H_ (17)) _2.