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首页> 外文期刊>Crystal growth & design >Microwave Assisted Direct Nucleation Control for Batch Crystallization: Crystal Size Control with Reduced Batch Time
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Microwave Assisted Direct Nucleation Control for Batch Crystallization: Crystal Size Control with Reduced Batch Time

机译：微波辅助直接成核控制批量结晶：减少批量时间的晶体尺寸控制

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摘要

Direct nucleation control (DNC) is a feedback control strategy, based on an in situ measurement of the number of particles. In batch cooling crystallization processes, the DNC approach utilizes temperature cycling to control the supersaturation profile during the batch. As a result of this cycling, product crystals with a large mean size and a narrow size distribution can be achieved due to the dissolution of undesired fines. However, implementing the temperature cycles may come at the expense of significantly prolonged batch times due to conventional heat transfer limitations and practical limitations for implementing actuation for both conventional heating and cooling. In this work, microwave heating in combination with DNC is presented to eliminate limitations of conventional heating and further improve the effectiveness of DNC. The results show a very rapid response when using microwave heating, which allowed for improved effectiveness of DNC. In particular, batch times under DNC could be reduced by 50% using microwave heating compared to conventional heating, producing crystals with a narrow distribution similar to experiments with conventionally heated DNC.
机译：直接成核控制（DNC）是基于粒子数量的原位测量的反馈控制策略。在间歇冷却结晶过程中，DNC方法利用温度循环来控制间歇过程中的过饱和曲线。由于该循环，由于不希望的细粒的溶解，可以得到具有大的平均尺寸和窄的尺寸分布的产物晶体。然而，由于常规的传热限制和实施常规加热和冷却的致动的实际限制，实施温度循环可能以显着延长的批处理时间为代价。在这项工作中，提出了结合DNC进行微波加热以消除传统加热的局限性并进一步提高DNC的有效性。结果表明使用微波加热时响应非常快，从而提高了DNC的有效性。特别是，与常规加热相比，使用微波加热可将DNC下的批处理时间减少50％，从而产生具有窄分布的晶体，类似于使用常规加热的DNC进行的实验。

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