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Thermo‐Kinetic Investigation of the Preparation of Micronized Ammonium Perchlorate Particles by Using Rapid Cooling Crystallization Method
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-03-01 , DOI: 10.1002/prep.202000218 Javad Mohebbi Zinab 1 , Seyed Ghorban Hosseini 1 , Saeed Tavangar 1 , Mohammad Mahdi Bahri 1
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-03-01 , DOI: 10.1002/prep.202000218 Javad Mohebbi Zinab 1 , Seyed Ghorban Hosseini 1 , Saeed Tavangar 1 , Mohammad Mahdi Bahri 1
Affiliation
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Production of micronized ammonium perchlorate particles (AP) (<25 μm) has a great importance in the composite solid propellant industry. In the present study, an attempt was made to consider thermo‐kinetic preparation of AP particles by using simple McCabe model in a cooling crystallization system. For this reason, an experimental design based on temperature, pressure, time, and concentration was used. Temperature in the range of 323–343 K, pressure in the range of 3
–18
Pa, and concentration in the range of 0.4–0.5 g/mL were set for the experiments. The time parameter was variable regarding to the temperature and concentration of each experiment and it was measured to evaluate the rate of process. The crystal size as an experiment response was estimated using image analysis of produced samples by MIP software in micrometer scale. Finally, a growth rate equation was established considering the results obtained from temperature variations, pressure, concentration, and time. Decrease in temperature variations caused to increase in crystallization rate and crystal size. The pressure above 7.5
Pa resulted in producing crystals smaller than 40 μm. The lowest crystal size was observed in the concentration of 0.45–0.5 g/mL and the crystallization time below 8 s. In addition, the results obtained from presented equation and experiment were matched with McCabe model.
中文翻译：
快速冷却结晶法制备微粉状高氯酸铵颗粒的热动力学研究
微粉状高氯酸铵颗粒（AP）（<25μm）的生产在复合固体推进剂行业中具有重要意义。在本研究中，尝试通过在冷却结晶系统中使用简单的McCabe模型来考虑AP颗粒的热动力学制备。因此，使用了基于温度，压力，时间和浓度的实验设计。温度在323-343 K，在范围3压力的范围
-18实验设定了Pa和0.4-0.5 g / mL范围内的浓度。时间参数相对于每个实验的温度和浓度是可变的，并且对其进行测量以评估处理速率。使用MIP软件以微米级对生产的样品进行图像分析，可估算出作为实验响应的晶体尺寸。最后，根据温度变化，压力，浓度和时间获得的结果，建立了一个增长率方程。温度变化的减少导致结晶速率和晶体尺寸的增加。压力在7.5以上Pa导致产生小于40μm的晶体。最低的晶体大小为0.45-0.5 g / mL，结晶时间低于8 s。此外，从给出的方程和实验获得的结果与McCabe模型相匹配。
更新日期：2021-05-04
–18 Pa, and concentration in the range of 0.4–0.5 g/mL were set for the experiments. The time parameter was variable regarding to the temperature and concentration of each experiment and it was measured to evaluate the rate of process. The crystal size as an experiment response was estimated using image analysis of produced samples by MIP software in micrometer scale. Finally, a growth rate equation was established considering the results obtained from temperature variations, pressure, concentration, and time. Decrease in temperature variations caused to increase in crystallization rate and crystal size. The pressure above 7.5 Pa resulted in producing crystals smaller than 40 μm. The lowest crystal size was observed in the concentration of 0.45–0.5 g/mL and the crystallization time below 8 s. In addition, the results obtained from presented equation and experiment were matched with McCabe model.
中文翻译：
快速冷却结晶法制备微粉状高氯酸铵颗粒的热动力学研究
微粉状高氯酸铵颗粒（AP）（<25μm）的生产在复合固体推进剂行业中具有重要意义。在本研究中，尝试通过在冷却结晶系统中使用简单的McCabe模型来考虑AP颗粒的热动力学制备。因此，使用了基于温度，压力，时间和浓度的实验设计。温度在323-343 K，在范围3压力的范围
-18实验设定了Pa和0.4-0.5 g / mL范围内的浓度。时间参数相对于每个实验的温度和浓度是可变的，并且对其进行测量以评估处理速率。使用MIP软件以微米级对生产的样品进行图像分析，可估算出作为实验响应的晶体尺寸。最后，根据温度变化，压力，浓度和时间获得的结果，建立了一个增长率方程。温度变化的减少导致结晶速率和晶体尺寸的增加。压力在7.5以上Pa导致产生小于40μm的晶体。最低的晶体大小为0.45-0.5 g / mL，结晶时间低于8 s。此外，从给出的方程和实验获得的结果与McCabe模型相匹配。
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