DSC法测定2,3,6–三甲基苯酚的纯度及其热力学性质  

Measurement of Purity and Thermodynamic Properties of 2,3,6-Trimethylphelnol with DSC

作　　者：王彦飞 王婧莹 李亚楠 胡佳琪 朱亮 杨立斌 赵晓昱 WANG Yanfei;WANG Jingying;LI Yanan;HU Jiaqi;ZHU Liang;YANG Libin;ZHAO Xiaoyu(College of Chemical Engineering and Materials Science,Tianjin University of Science&Technology,Tianjin 300457,China)

机构地区：[1]天津科技大学化工与材料学院,天津300457

出　　处：《天津科技大学学报》2018年第6期41-44,共4页Journal of Tianjin University of Science & Technology

基　　金：教育部科研创新团队培育计划资助项目([2013]373);天津市高等学校创新团队培养计划资助项目(TD12-5004)

摘　　要：利用差示扫描量热仪(DSC)测定经过熔融结晶法得到的2,3,6–三甲基苯酚(TMP)的纯度,熔点和熔融焓(结晶焓).其熔点几乎不受升温速率影响,平均值为335.35,K,不确定度为±(0.1～0.3),K,与文献值基本吻合,相对偏差在1.27%,～2.81%.TMP的熔融焓(结晶焓)平均值为167.8,J/g,相对平均偏差为2.77%.通过DSC测定该纯度的TMP在278.15～313.15,K(固相)和358.15～398.15,K(液相)范围内的比定压热容.固相TMP的比定压热容随温度升高而升高,液相TMP的比定压热容随温度升高而降低.将比定压热容与温度进行线性关联,R2值均大于0.99.本文的相关数据可为TMP熔融结晶工艺开发的热量衡算提供理论依据.The purity purified through melt crystallization,melting point and melting enthalpy(enthalpy of crystallization)of 2,3,6-trimethylphenol(TMP)were determined with the differential scanning calorimeter(DSC).The melting point is almost not affected by the heating rate,and the average value is 335.35,K,consistent with the literature value.The relative error of the melting point is 1.27%-2.81%,.The uncertainty is±(0.1-0.3),K.The average value of the melting enthalpy(enthalpy of crystallization)is 167.8,J/g.The relative average deviation is 2.77%,.The specific heat capacity(c p)of solid(278.15-313.15,K)and liquid(358.15-398.15,K)at constant pressure were also measured with DSC.c p of solid TMP increases with the increase of temperature,while c p of liquid TMP decreases with the increase of temperature.The relation of c p and temperature is correlated with linear equation.Values of R2,are larger than 0.99.The research can provide basic data for the heat balance calculation of TMP melting crystallization process.

关 键 词：差示扫描量热仪(DSC) 纯度测定 熔点 熔融焓(结晶焓) 比定压热容 2 3 6–三甲基苯酚 

分 类 号：TQ522.59[化学工程—煤化学工程]