Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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A Study on the Preparation of High Purity Silicic Acid by Solvent Extraction from Sodium Silicate

규산 나트륨으로부터 유기 용매 추출에 의한 고순도 규산 제조에 관한 연구

  • Rho, Jae-Seong (Dept. of Fine Chemicals Eng. and Chemistry, College of Eng., Chungnam National Univ.) ;
  • Hong, Seong-Su (Dept. of Chem. Eng., College of Eng., Hoseo University) ;
  • Chung, Hung-Ho (Dept. of Fine Chemicals Eng. and Chemistry, College of Eng., Chungnam National Univ.)
  • 노재성 (충남대학교 공과대학 정밀공업화학과) ;
  • 홍성수 (호서 대학교 공과대학 재료화학공학부) ;
  • 정흥호 (충남대학교 공과대학 정밀공업화학과)
  • Received : 1996.06.03
  • Accepted : 1996.07.09
  • Published : 1996.08.10
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Abstract

Silicic acid(SA) was extracted with organic solvents from aqueous sodium silicate solutions acidified with dilute sulfuric acid. Tetrahydrofuran(THF), isopropyl alcohol and acetone were used as organic solvents. The extraction degree of Si and the removal efficiency of Na is determined according to kinds of solvent and the mixing ratios of solvent, sodium chloride and $H_2O$. Optimum conditions for the preparation of high purity SA were THF as an organic solvent, volume ratio of organic solvent/SA : 1 (organic solvent 10ml/10ml SA) and the amount of NaCl addition 2.5g/10ml SA. The extraction degree of Si and the removal efficiency of Na at that point were 86.2% and 99.95% respectively and the purity of SA was 99.96%.

규산 나트륨으로부터 묽은 황산으로 산성화시킨 규산 나트륨용액으로부터 유기 용매에 의한 추출로 규산[Silicic Acid(SA)]을 제조하였다. 유기 용매로 tetrahydrofuran(THF), isopropyl alcohol과 acetone을 사용하여 Si 추출율과 Na 제거율에 미치는 영향과 유기 용매의 부피비, 염화 나트륨 첨가량 및 $H_2O$ 첨가량에 따른 영향을 파악하였다. 고순도 규산을 제조하기위한 최적 조건은 유기 용매 THF, 유기 용매/규산의 부피비 1(organic solvent 10ml/10ml SA) 그리고 염화 나트륨 첨가량 2.5g/10ml SA이었고, 이 조건에서 Si 추출율 86.2%, Na 제거율 99.95%인 99.96%의 고순도 규산을 제조하였다.

Keywords

Acknowledgement

Supported by : 한국과학재단

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