Status and plans for activities at Beijing University

Status and plans for activities at Beijing University of Chemical Technology Phase Change Materials for Heat Storage Jiqin Zhu 2010 -12 -13

General Outline 1. New PCMs based on ionic liquids 2. Quantitative structure–property relationship (QSPR) study for fusion heat of ionic liquids 3. Publication and patent application 4. Next plan

1. New PCMs based on ionic liquids Di-cationic liquids: R 1=H，methyl R 2=methyl, ethyl or butyl X=Br，Cl

1. New PCMs based on ionic liquids No Name Melting point, ℃ Heat of fusion, J/g 1 Butyl-caprolactam bromide 73 141. 9 2 hexyl-caprolactam bromide 72 137. 0 3 1, 1 -bis(caprolactam-1 -yl) methane chloride 70. 2 123. 0 4 1, 1 -bis(3 -methylimidazolium-1 -yl) methane chloride 272. 5 122. 3 5 1, 2 -bis(3 -methylimidazolium-1 -yl) ethane chloride 128 22. 5 6 1, 2 -bis(2, 3 -dimethylimidazolium-1 -yl) ethane chloride 101 54. 1 7 1, 2 -bis(caprolactam-1 -yl) ethane chloride 72. 6 139. 0 8 1, 4 -bis(3 -methylimidazolium-1 -yl) butane bromide 73. 1 114. 4 9 1, 4 -bis(caprolactam-1 -yl) butane bromide 63. 2 126. 3 10 1, 4 -bis(caprolactam-1 -yl) butane chloride 71. 6 140. 6

1. New PCMs based on ionic liquids

2. QSPR study for fusion heat of ionic liquids Gaussian 03 with a B 3 LYP function and a 6 -31 G* basis set

2. QSPR study for fusion heat of ionic liquids For 44 ionic liquids: experimental and calculated heat of fusion for 44 ionic liquids

2. QSPR study for fusion heat of ionic liquids For different kinds of ionic liquids: Correlation and prediction for heats of fusion

3. Publication and patent application Publication: Liguang Bai, Jiqin Zhu*, Biaohua Chen, Chengyue Li and Weiyang Fei. Applications of ionic liquids in heat transfer and heat storage process. Journal of Chemical Industry & Engineering (China), 2010, 61(12): 3037 -3043. Patent application (in Chinese): 一种离子液体基复合相变蓄热材料及其制备方法 201010150482. 0

4. Next plan 1. For solar water heater, screening organic PCMs; 2. For the selected PCMs(3~5 kinds), measuring their melting heat, supercooling, and stability; 3. Providing 10 kg PCM for Beijing Solar Energy Research Institute.

Thanks for attention!