Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Synthesis of n-nitrilotris(methylene) Phosphonic Acid Potassium Salt as a Draw Solute in Forward Osmosis Process

정삼투 분리막 공정 적용을 위한 n-nitrilotris(methylene) Phosphonic Acid Potassium Salt 유도용질의 합성

  • Lee, Hye-Jin (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technolgy) ;
  • Choi, Jin-Il (Center for Small & Medium Enterprises Support, Technology Commercialization Division, Korea Research Institute of Chemical Technolgy) ;
  • Kwon, Sei (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technolgy) ;
  • Kim, In-Chul (Center for Membrane, Advanced Materials Division, Korea Research Institute of Chemical Technolgy)
  • 이혜진 (한국화학연구원 그린화학소재연구본부 분리막연구센터) ;
  • 최진일 (한국화학연구원 기술사업화본부 중소기업지원센터) ;
  • 권세이 (한국화학연구원 그린화학소재연구본부 분리막연구센터) ;
  • 김인철 (한국화학연구원 그린화학소재연구본부 분리막연구센터)
  • Received : 2018.10.11
  • Accepted : 2018.10.29
  • Published : 2018.10.31
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Abstract

The n-nitrilotris(methylene) phosphonic acid (NTPA) potassium salt was synthesized as a draw solute for forward osmosis. NTPA-4K, NTPA-5K and NTPA-6K were synthesized by varying the content of KOH added to NTPA and confirmed by $^1H$-NMR and $^{13}C$-NMR. The osmotic pressure, viscosity, water flux and reverse salt flux were measured to characterize the draw solute. In the forward osmosis process when distilled water was used as a feed solution and 0.5 M of NTPA-4K, NTPA-5K and NTPA-6K were used as a draw solution, the water flux was 35.8, 38.8 and 42.2 LMH, the reverse salt flux was 5.4, 6.9 and 7.4 gMH, respectively. It was confirmed that the water flux was lower than the conventional NaCl draw solution, but the reverse salt flux was much lower. In order to recover the diluted draw solution, nanofiltration was conducted. The results showed that the draw solute could be retained by above 90%.

정삼투 공정에 유용한 유도용질로서 n-nitrilotris(methylene) phosphonic acid (NTPA) 염을 합성하였다. NTPA에 첨가하는 KOH의 함량을 변화시켜 NTPA-4K, NTPA-5K, NTPA-6K 세 종류의 유도용질을 합성하고 $^1H$-NMR, $^{13}C$-NMR을 통하여 확인하였다. 유도용질의 물성을 확인하기 위해 삼투압, 점도, 수투과도, 역염 투과도를 측정하였다. 정삼투 공정에서는 증류수를 유입용액으로 사용하고 0.5 M의 유도용액으로 실험한 결과 각각 수투과도는 35.8, 38.8, 42.2 LMH를 나타내고 5.4, 6.9, 7.4 gMH의 역염 투과도를 나타내었다. 이는 기존의 NaCl 유도용액보다 높은 수투과도와 훨씬 낮은 역염 투과도를 확인하였다. 정삼투 공정 후 묽어진 유도용질의 회수를 위해 나노여과 방식으로 상용막을 사용하여 제거율을 측정한 결과 90% 이상의 높은 성능을 확인하였다.

Keywords

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