混合量热法测定水合物分解热

Determination of dissociation heat of hydrate by mixing calorimetry

提出了一种采用混合量热法测量常压下水合物分解热的实验方法.混合量热法是根据能量守恒对整个系统进行热量衡算进而计算出水合物分解热的一种方法,并采用此方法测量了四氢呋喃(Tetrahydro furan,THF)水合物和一氟二氯乙烷(HCFC-141b)水合物的分解热:常压下,相变点在4.4℃时,THF水合物分解热为(275.62±2.64)kJ/kg;相变点在8.4℃时,HCFC-141b水合物为(348.48±3.08)kJ/kg,与相关文献数据对比相对误差分别为2%、6.2%.考虑到THF与HCFC-141b各自物性,得到混合法分解实验中THF水合物和HCFC-141b水合物与热水的最佳质量比分别为1∶2和1∶2.5.

A method based on the mixing calorimetry for determination of hydrate dissociation heat was introduced. Under the condition of atmospheric pressure, the dissociation heat of tetrahydrofuran （THF） hydrate, which was about （275.62 ± 2.64） kJ/kg at 4.4℃of phase-transition temperature, was determined by this method. Similarly, the dissociation heat of CH3 CFCl2 （HCFC-141b） hydrate was about （348.48 ± 3.08） kJ/kg at the phase-transition temperature of 8.4 ℃. By comparison with those previous results, the maximum relative error is 2 % and 6.2 %, respectively. To obtain the optimal results of dissociation heat, the mass ratio between hot water and THF hydrate or HCFC-141b hydrate has been optimized as well.