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相关概念视频

Precipitation Processes01:12

Precipitation Processes

331
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
331

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评估共振声学混合作为湿颗粒处理的过程.

Matthew Frederick Lopez Villena1, Zachary Dean Doorenbos1, Kyle Thomas Sullivan1

  • 1Materials Science Division, Lawrence Livermore National Laboratory, Livermore, California 94550, United States.

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概括

响应声学颗粒剂为工业环境中控制粉末特性提供了一种新的方法. 这种技术将颗粒与现有工艺相结合,提高效率并扩大材料的兼容性.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 过程强化 过程强化

背景情况:

  • 在食品,制药和农业等各种行业中,粉末财产控制至关重要.
  • 颗粒化是生产具有量身定制性质的聚合颗粒的关键技术.
  • 目前的颗粒化方法往往缺乏与其他工艺的整合和材料的多功能性.

研究的目的:

  • 引入和研究共振声学 (RAM) 颗粒作为一个集成的过程.
  • 使用LabRAM II系统来证明颗粒的形成.
  • 为了阐明在湿颗粒的背景下颗粒化机制.

主要方法:

  • 使用LabRAM II共振声学混合器进行颗粒化.
  • 形成大型"面粉球"聚合物,然后是溶剂蒸发引起的分解.
  • 分析颗粒形成机制,将其与已建立的湿颗粒模型进行比较.

主要成果:

  • 成功形成颗粒,颗粒大小约为1-3毫米.
  • 确定了RAM颗粒化过程与破坏性核化模型相似.
  • 证明溶剂蒸发会降低面团液的和度和拉伸强度,从而促进分解.

结论:

  • 响应声学颗粒剂通过将颗粒剂整合到现有操作中,为工艺强化提供了一条途径.
  • 这项研究为设计使用共振声学混合器的颗粒化工艺奠定了基础.
  • 将RAM颗粒与现有机制联系起来,可以加深对该过程及其应用的理解.