Molar heat capacity and thermodynamic properties of 1-cyclohexene-1,2-dicarboxylic anhydride [C 8H 8O 3]

• Published in: The Journal of chemical thermodynamics Vol. 36; no. 9; pp. 787 - 792
• Main Authors: Lv, Xue-Chuan, Tan, Zhi-Cheng, Di, You-Ying, Shi, Quan, Sun, Li-Xian, Zhang, Tao
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.09.2004; Elsevier
• Subjects: 1-Cyclohexene-1,2-dicarboxylic anhydride; Adiabatic calorimeter; Chemical thermodynamics; Chemistry; Elements, mineral and organic compounds; Exact sciences and technology; General and physical chemistry; Low-temperature heat capacity; Purity determination; Thermal analysis; Thermodynamic properties; Purity determination; Low-temperature heat capacity; Thermal analysis; Adiabatic calorimeter; 1-Cyclohexene-1,2-dicarboxylic anhydride; Thermal properties; Heat capacity; Purity control; Organic anhydride; Thermodynamic properties
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2004.05.008

The molar heat capacity C p,m of 1-cyclohexene-1,2-dicarboxylic anhydride was measured in the temperature range from T=(80 to 360) K with a small sample automated adiabatic calorimeter. The melting point T m, the molar enthalpy Δ fus H m and the entropy Δ fus S m of fusion for the compound were determined to be (343.46 ± 0.24) K, (11.88 ± 0.02) kJ · mol −1 and (34.60 ± 0.06) J · K −1 · mol −1, respectively. The thermodynamic functions [ H ( T) − H (298.15)] and [ S ( T) − S (298.15)] were derived in the temperature range from T=(80 to 360) K with temperature interval of 5 K. The mass fraction purity of the sample used in the adiabatic calorimetric study was determined to be 0.9928 by using the fractional melting technique. The thermal stability of the compound was investigated by differential scanning calorimeter (DSC) and thermogravimetric (TG) technique, and the process of the mass-loss of the sample was due to the evaporation, instead of its thermal decomposition.