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Abstract
The solid-liquid equilibrium solubility of clozapine in eighteen organic solvents (i.e., methanol, ethanol, n-propanol, i-propanol, n-butanol, i-butanol, s-butanol, n-pentanol, i-pentanol, acetone, 2-butanone, acetonitrile, N, N-dimethylformamide, tetrahydrofuran, chloroform, ethyl formate, methyl acetate, and ethyl acetate) was determined using a gravimetric method over a temperature ranging from 278.15 K to 323.15 K at atmospheric pressure. The modified Apelblat equation, λh equation, NRTL equation, and Wilson equation were selected to correlate the solubility data. The fitting degree of thermodynamic models was evaluated by the relative average deviation, and root mean root mean square deviation. Dissolution properties, including enthalpy, entropy, and Gibbs energy changes of clozapine were evaluated by the Wilson model. The solubility data, thermodynamic parameters and dissolution properties for clozapine will be of crucial guiding value for the optimization of the industrial crystallization process.
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