Thermodynamic Study on the Adduct Crystallization of Terephthalic Acid with Amides

详细信息    查看全文

• 作者：Cheng Youwei ; Peng Ge ; Wu Bianhua ; Guo Xia ; Li Xi
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2011
• 出版时间：April 14, 2011
• 年：2011
• 卷：56
• 期：4
• 页码：1020-1024
• 全文大小：733K
• 年卷期：v.56,no.4(April 14, 2011)
• ISSN：1520-5134

文摘

The thermodynamics of adduct crystallization of terephthalic acid (TA) in amide solvents, such as N,N-dimethylacetamide (DMAC) and N-methyl-2-pyrrolidone (NMP), was studied in this paper. The results showed that the molecule ratio of TA and solvent in the TA-DMAC and TA-NMP adduct crystals is about 1:2. With poor thermal stability, the dissociation temperatures of the TA-DMAC and TA-NMP adduct crystals are about (341 and 313) K, respectively. The adduct crystallization is an exothermic process; the crystallization enthalpy of the [TA路2DMAC] adduct is about 鈭?4.00 kJ路mol^鈭?, and that of the [TA路2NMP] adduct is about 鈭?1.12 kJ路mol^鈭?. Finally, analysis of the liquid鈭抯olid equilibrium indicated that the concentration difference between the solubility of adduct crystals and the notional TA solid may result in the automatic adduct crystallization process.