3,4-二硝基呋咱基氧化呋咱冷却结晶动力学

Cooling Crystallization Kinetics of 3,4-Bis(3-nitrofurazan-4-yl)furoxan

采用间歇结晶器对3,4-二硝基呋咱基氧化呋咱(DNTF)在V(乙酸)∶V(水)=7∶3的混合溶液中的冷却结晶动力学进行研究。以粒数衡算方程为基础,利用最小二乘法对实验数据进行多元线性回归,确定DNTF冷却结晶的成核和生长速率方程。结果表明,DNTF晶体的生长、成核速率相对于过饱和度的指数分别为3.83和1.3,说明增加系统的过饱和度能同时增加晶体的成核和生长速率,但生长速率增加更快;晶体成核速率对于悬浮粒子密度的指数高达2.14,说明随晶浆悬浮粒子密度的增加,晶体成核速率会显著上升而生长速率不变,这将不利于晶体的长大。

The cooling crystallization kinetics of 3,4-bis（3-nitrofurazan-4-yl） furoxan （DNTF） in V（ acetic acid） ： V（water）= 7 ： 3 mixed solvent was investigated by a batch crystallizer. Based on the equation of population balance, the nucleation and growth rate equation of DNTF cooling crystallization were determined performing multiple linear regression of experimental data by the least squares method. Results show that the indexes of crystal growth rate and nucleation rate of crystal for supersaturated degree are 3.83 and 1. 3, respectively, meaning that the nucleation and growth rates of crystal increase with increasing the supersaturated degree of the system, but the growth rate increases faster. The index of crystal nucleation rate for the suspension particle density is up to 2.14, it means that with increasing the suspension particle density, the crystal nucleation rate increases significantly but the growth rate does not change, which are not favorable to crystal growth.