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Determination and correlation of temperature and pH value dependent solubility of dl ‐methionine
Author(s) -
Chen Zhirong,
Zhou Rongfan,
Yin Hong,
Yuan Shenfeng
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16270
Subject(s) - solubility , enthalpy , dissolution , uniquac , chemistry , non random two liquid model , thermodynamics , enthalpy of fusion , crystallization , gravimetric analysis , entropy of fusion , activity coefficient , melting point , aqueous solution , organic chemistry , physics
In order to provide basic data for the crystallization of dl ‐methionine and understand the thermodynamic properties of dissolution, the solubility of dl ‐methionine in water was measured by gravimetric method from 294.05 to 347.05 K and the solubility at different pH values under temperature 302.95 to 342.05 K was determined by elemental analysis in this work. The experimental data show that the solubility of dl ‐methionine increases with increasing temperature as well as more acidic or basic pH values. The van't Hoff equation, modified Apelblat equation, λh equation, Wilson model, NRTL model, and UNIQUAC model were used to correlate the solubility data versus temperature. The melting temperature, enthalpy of fusion, enthalpy and entropy of dissolution were estimated from solubility data and it shows that the expression of solubility by enthalpy and entropy of dissolution gives more reasonable estimation and Wilson model gives a better correlation for these thermodynamic properties.