Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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A Study on the Synthesis of Aluminum Citrate from Aluminum Chloride Solutions

염화(鹽化)알루미늄 수용액(水溶液)으로부터 Aluminum Citrate의 합성(合成) 연구(硏究)

  • Lee, Hwa-Young (Battery Research Center, Korea Institute of Science & Technology)
  • 이화영 (한국과학기술연구원 이차전지연구센터)
  • Published : 2009.12.27
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Abstract

An investigation on the synthesis of aluminum citrate, one of the aluminum organic compounds, has been performed using aluminum chloride solutions as a starting material. For the synthesis of aluminum citrate, citric acid was added to aluminum solutions with the mole ratio of citric acid to aluminum to be 2.5 and aluminum citrate synthesized was also characterized in terms of chemical analysis, X-ray diffraction, particle size measurement and SEM analysis. As a result, it was found that the ratio of ethanol/Al solution more than 4.0 was required for the synthesis of aluminum citrate from aluminum solutions. Furthermore, the pH should be controlled to be more than 7.0 in order to obtain the recovery of aluminum citrate higher than 97%. From the chemical analysis of aluminum citrate synthesized in this work, the content of $NH_4$, Al and C was found to be 17.0, 4.01 and 25.7%, respectively. Accordingly, the aluminum citrate synthesized from aluminum solutions was confirmed to be $(NH_4)_5Al(C_6H_4O_7)_2{\cdot}2H_2O$.

염화알루미늄 수용액으로부터 알루미늄 유기화합물인 구연산알루미늄 합성실험을 수행하였다. 수용액중 알루미늄 농도와 구연산 농도비율은 몰비 2.5가 되도록 첨가해 주었으며, 합성된 구연산알루미늄은 화학분석, X-선 회절분석, 입도분석 및 SEM 분석을 통하여 시료특성을 평가하였다. 알루미늄 수용액으로부터 구연산알루미늄을 합성하기 위해서는 에탄올/알루미늄 수용액 혼합비율을 4.0이상으로 유지하여야 하는 것으로 나타났다. 또한, 97% 이상의 회수율을 얻기 위해서는 혼합액의 pH를 7.0이상으로 조절하여야 하는 것으로 나타났다. 합성반응을 통해 얻은 구연산알루미늄의 화학분석결과 $NH_4$ 17.0%, Al 4.01% 및 C 25.7%이었으며, 이의 화학식은 $(NH_4)_5Al(C_6H_4O_7)_2{\cdot}2H_2O$임을 확인할 수 있었다.

Keywords

References

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