2-4-3 THFハイドレートに対するアンモニウムイオンの分配係数

抄録

Although it is known that ammonium ion is replaced with a part of water cages of clathrate hydrate, it isn't known how much amount of ammonium ions are included into clathrate hydrate with the formation. We investigated how much amount of ammonium ions were included into clathrate hydrate with its formation. Tetrahydrofuran (THF) hydrate, as an analogue for CH₄ and CO₂ hydrate, was formed in a solution of THF with ammonium chloride. The concentration of ammonium ion in THF hydrate (CS) was determined and compared with the initial concentration of ammonium ion (C₀). The ratio of C_S to C₀ (K=C_S/C₀) was determined when the volume ratio of formed solid to liquid was less than 0.9. The K value was 0.28 approximately when C₀ wasn't more than 10 mmol/L. This value was about three times more than that value when ice was formed in an ammonium ion solution.