Clathrate hydrates of tetrabutylammonium carboxylates and dicarboxylates

Thermodynamic Properties of Ionic Semiclathrate Hydrate Formed with Tetrabutylammonium Propionate

“…Previous studies were performed considering the phase equilibrium temperatures of tetrabutylammonium carboxylates hydrates. Nakayama et al reported that the highest equilibrium temperature of tetrabutylammonium propionate (TBAPr) hydrate was 18.0 °C and Dyadin et al found 18.1 °C . The temperatures are higher than the required temperature for residential air conditioning, but it is suitable for air conditioning of data centers.…”

Equilibria in ion exchanger-aqueous salt solution systems and clathrate formation

“…Hence, the question of presence/absence of significant clathration in solution is in fact still open, and the abovementioned conclusion was wrong, as will be shown below. 3 Naturally, in the adjustment we placed the focus only on provision of experimentally verifiable identifiability of the (p, T, X)-conditions (p = 1 atm, X is the vector of the composition of the aqueous salt solution in terms of the initial components [14][15][16] obtained in [27], for each temperature in the temperature series (t) examined the following conditional equilibrium constant can be associated with process (1):…”

“…7 The possibility of this rearrangement is indicated by a drastic change in the form of the empirical function in the S(Bu 4 N + ) > 0. 3 To conclude, three points will be emphasized. First, the absence of significant manifestations of formation of the Bu 4 NBr solv ion pair in the composition of an aqueous solution of the heterogeneous system under study certainly does not exclude the possibility, in principle, of formation of clathrate-like structures for water molecules in the first hydration-solvation sphere of the Bu 4 N + solv particles in these same aqueous solutions.…”

“…The structure and physicochemical properties of crystalline clathrate hydrates of monomeric salts of quaternary alkylammonium bases with halide and carboxylate ions have been fairly extensively studied, and the relevant data have been summarized in multiple publications (see, e.g., [1][2][3][4]). It has been shown that the clathrate structures of crystalline hydrates are effectively stabilized by single salts based on tetrabutylammonium Bu 4 N + and tetraisoamylammonium i-Am 4 N + cations.…”

“…1 This idea has long been a scientific hypothesis within the general knowledge of clathrate formation phenomena [1][2][3][4][5][6][7][8][9][18][19][20][21][22], not without reasons, including the results of aqueous solution studies by physical methods [23][24][25][26].…”