2-5-2 TBAB 26H₂O内で生成する物質の成長過程に対するTBAB水溶液の濃度の影響

抄録

To investigate the effect of the concentration of tetra-n-butylammonium bromide (TBAB) aqueous solution on the unique growth process of the TBAB hydrate formed in solid TBAB 26H₂O (semiclathrate hydrate), TBAB 26H₂O samples were prepared from 40, 42, and 44wt% TBAB aqueous solutions and held at 11°C for 12 hours to 27 days. The weights of the TBAB hydrate formed in the samples were measured. TBAB 26H₂O prepared from 42wt% TBAB aqueous solution was mostly changed to the TBAB hydrate within two weeks, though the other TBAB 26H₂O solids were partially converted. Since the converted hydrate is close to TBAB 24H₂O in stoichiometric composition and the dissociation temperature of TBAB 24H₂O is higher than that of TBAB 26H₂O, we consider that TBAB 24H₂O might be formed in solid TBAB 26H₂O.