反气相色谱法测定有机溶剂型木质素的溶解度参数

摘要

An inverse gas chromatographic (IGC) method has been used to measure the solubility parameters (δ2) of organosolv lignin at the absolute temperatures from 333. 15 K to 373.15 K. The test probe solvents were n-octane (n-C8), n-decane (n-C10), n-dodecane (n-C12), and n-tetradecane (n-C14). The specific retention volumes of the solvents (V0g), the molar enthalpy of sorption (△Hs1), the partial molar enthalpy of mixing at infinite dilution (AH∞1), the molar enthalpy of vaporization (△Hv), the activity coefficients at infinite dilution (Ω∞1), and Flory-Huggins inter action parameters (x∞12) between organosolv lignin and probe solvents were obtained. The results showed that the above four probes are poor solvents for organosolv lignin; at the same temperature, the x∞12 reduced with the increase of the carbon number of probe solvents. The average solubility parameter of organosolv lignin was determined as 19. 03 (J·cm-3)1/2.%采用反气相色谱法(IGC),于333.15 ～373.15 K温度范围内测定了有机溶剂型木质素的溶解度参数(δ2)及相关指标.以正辛烷(n-C8)、正癸烷(n-C10)、正十二烷(n-C12)和正十四烷(n-C14)为探针溶剂,计算了探针溶剂的特性保留体积(V0g)、摩尔吸收焓(△H31)、无限稀释摩尔混合焓(△H∞1)、摩尔蒸发焓(△Hv)、无限稀释活度系数(Ω∞1)以及探针溶剂与有机溶剂型木质素的Flory-Huggins相互作用参数(x∞12).结果表明,上述4种探针溶剂在测定的温度范围内均为有机溶剂型木质素的不良溶液；在同一温度下,参数x∞12随着探针溶剂碳数的增加而降低.测得的有机溶剂型木质素的δ2为19.03 (J· cm-3)1/2.