萘或联苯 + 1-十四醇或 + 1-十六醇二元体系的固液平衡
Solid-Liquid Equilibria for the Binary Systems Naphthalene or Biphenyl + 1-Tetradecanol or + 1-Hexadecanol
AI总结:
本文用差示扫描量热法测定萘或联苯与1-十四醇或1-十六醇二元体系的固液平衡,确定简单低共熔点,并用DISQUAC和UNIFAC模型描述相图,发现DISQUAC对温度依赖性描述更优。
摘要:
采用差示扫描量热技术测定了萘或联苯 + 1-十四醇、或 + 1-十六醇混合物的固液平衡温度。所有体系均呈现简单低共熔点,其最终组成通过Tamman图确定,所需使用的低共熔热和熔化热数值也一并给出。给出了所选体系中OH/芳香族接触的DISQUAC相互作用参数。本实验得到的固液相图可由DISQUAC和UNIFAC(Dortmund)模型同样地描述。然而,对涉及萘和较短1-烷醇(甲醇-1-辛醇)的体系进行DISQUAC与UNIFAC结果比较后发现,DISQUAC中相互作用参数的温度依赖性更为合适。还从浓度-浓度结构因子角度对这些体系进行了研究。结果表明,所研究溶液对Raoult定律的正偏差随着同配位作用的减弱而变小。
英文摘要:
A differential scanning calorimetric technique has been used to obtain solid-liquid equilibrium temperatures for the mixtures naphthalene or biphenyl + 1-tetradecanol, or + 1-hexadecanol. All the systems show a simple eutectic point, whose final composition was determined by means of the Tamman's plots using the needed values of the eutectic heat and of the heat of melting, which are also reported. DISQUAC interaction parameters for the OH/aromatic contacts in the selected systems are given. The present experimental SLE phase diagrams are similarly described by DISQUAC and UNIFAC (Dortmund) models. However, the comparison of DISQUAC and UNIFAC results for systems involving naphthalene and shorter 1-alkanols (methanol-1-octanol) reveals that the temperature dependence of the interaction parameters is more suitable in DISQUAC. The systems are also investigated in terms of the concentration-concentration structure factor. It is shown that the positive deviations from the Raoult's law of the studied solutions become weaker when the homocoordination decreases.
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