枞酸若干热力学性质的测定  

Determination of Several Thermodynamics Properties of Abietic Acid

作　　者：农韦健[1] 陈小鹏[1] 王琳琳[1] 梁杰珍[1] 童张法[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《高校化学工程学报》2012年第4期552-557,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金项目(20976031;31060102);广西自然科学基金重点项目(2011GXNSFD018011);广西自然科学基金项目(0991030;2010GXNSFA013042);广西梧州科技开发项目(200901011);广西科技攻关项目(桂科攻1099060-2);广西研究生教育创新计划项目(105930901008)

摘　　要：采用超声波强化反应-结晶耦合的方法单离松香主要成分枞酸,测定了枞酸的恒容燃烧热、熔点和比旋光度,通过UV、GC-MS、NMR对枞酸进行分析鉴定。结果表明,用GR-3500B2氧弹式量热计测定枞酸的恒容燃烧热为–11441.46 kJ mol 1,计算出枞酸的标准摩尔燃烧焓和标准摩尔生成焓分别为–11457.57 kJ mol 1和–699.43 kJ mol 1;用341LC plus微量旋光仪测定枞酸的比旋光度为–105.4;用DSC 6200差示扫描量热仪测得枞酸的熔点和熔化焓分别为450.89 K和19.44 kJ mol 1,计算出枞酸的熔化熵为43.11 J mol 1 K 1。Abietic acid, a major component of rosin, was isolated by means of reaction-crystallization strengthened with ultrasonic waves, and then it was characterized by ultraviolet visible spectra （UV）, gas chromatography-mass spectra （GC-MS）, and 1H nuclear magnetic resonance spectra （1H-NMR）, respectively. The constant-volume combustion heat of abietic acid was determined to be -11441.46 kJ.mol^-1 by GR-3500B2-type oxygen bomb calorimeter, and based on the thermodynamic principle, the standard molar combustion enthalpy and molar enthalpy of formation of abietic acid were calculated to be -11457.57 kJ-mol^-1 and -699.43 kJ-mol^-1. The specific optical rotation of the abietic acid was determined to be -105.4° by using a 341LC polarimeter. The melting point and the molar fusion enthalpy of abietic acid were determined to be 450.89 K and 19.44 kJ.mol^-1 via differential scanning calorimetry （DSC）, and the molar fusion entropy of abietic acid was calculated to be 43.11 J.mol^-1.K^-1 according to thermodynamic principle.

关 键 词：枞酸 热力学性质 恒容燃烧热 熔化焓 

分 类 号：TQ351.471[化学工程] O621.24[理学—有机化学]