Influence of Gassing Crystallization Parameters on Induction Time and Crystal Size Distribution
Influence of Gassing Crystallization Parameters on Induction Time and Crystal Size Distribution
复制标题
放气结晶参数对诱导时间和晶体尺寸分布的影响
DOI：
10.1021/acs.cgd.6b00895
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发表时间：
2016
影响因子：
3.8
通讯作者：
K. Wohlgemuth
中科院分区：
文献类型：
--
作者：
Tobias Kleetz;F. Funke;Annika Sunderhaus;G. Schembecker;K. Wohlgemuth
与线性冷却曲线相结合的充气是一种创新技术，可诱导成核并控制产品性能。以往的研究发现，在析气过饱和度、析气持续时间和气体体积流量等析气参数中，析气过饱和度只对产品性能有影响。本文探讨了为什么充气时间和体积流量不能用来控制产品性能。因此，评估了充气参数对诱导时间和最终晶体尺寸分布的影响。使用琥珀酸/水作为模型体系在IL结晶器中进行实验。与常规冷却结晶相比，通入气体可使诱导期缩短约60 min。在气体体积流量的情况下，充气过程中气泡比表面积的差异太小，无法对诱导的晶核量产生影响，因此也无法对诱导时间产生影响。只有在不同过饱和度下的放气才导致不同的成核诱导量。
Gassing in combination with linear cooling profiles is an innovative technology to induce nucleation and control product properties. Previous work found that among gassing parameters like gassing supersaturation, gassing duration, and gas volume flow, gassing supersaturation has an effect on product properties only. This paper investigates why gassing duration and volume flow cannot be used to control product properties. Therefore, the influence of gassing parameters on induction time and final crystal size distributions were evaluated. Experiments were performed using succinic acid/water as model system in a 1 L crystallizer. Compared to normal cooling crystallization, induction time could be reduced by about 60 min by gassing. The difference in the specific bubble surface areas during gassing with the gas volume flows applied was too low to create an effect on the amount of nuclei induced and thus on induction time. Only gassing at different supersaturations resulted in different amounts of nuclei induc...