A Study on the Monodispersed Silica Fine Particles Prepared by Using Batch-Semibatch Mixed Process

회분과 반회분의 혼합형 공정에 의해 생성된 단분산 실리카 미립자에 관한 연구

  • Kim, Ki Do (Department of Chemical Engineering, Hanyang University) ;
  • Kim, Hee Taik (Department of Chemical Engineering, Hanyang University)
  • 김기도 (한양대학교 공과대학 화학공학과) ;
  • 김희택 (한양대학교 공과대학 화학공학과)
  • Received : 1999.08.19
  • Accepted : 1999.11.23
  • Published : 1999.12.10

Abstract

Modispersed silica fine particles were produced from the hydrolysis of $Si(OC_2H_5)_4$ by using batch-semibatch mixed systems. Four types of mixed process, i.e., batch-batch, batch-semibatch, semibatch-batch, semibatch-semibatch, were used in order to measure mean particle size, particle size distribution, yield, and packing density. As a result of the test, silica particles prepared by semibatch-semibatch process were larger than those prodeced from any other systems in particle size and yield. On the other hand, silica particles prepared by batch-semibatch process were better than those produced from any other systems in particle size distribution and packing density. Especially, it was found that particle size of $SiO_2$ prepared by semibatch-batch process decreased with increasing the reaction time. Therefore, batch-semibatch process was a successful method for controlling the size, i.e., a narrow distribution of a particle size which ranges to several microns.

Keywords

monodispersed silica;hydrolysis;batch;semibatch

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