Investigations on the solubilities of some disperse azo dyes in supercritical carbon dioxide

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• 作者：Fasihi ; Javad ; Yamini ; Yadollah ; Nourmohammadian ; Farahnaz ; Bahramifar ; Naader
• 关键词：Solubility ; Disperse azo dyes ; Supercritical carbon dioxide
• 刊名：Dyes and Pigments
• 出版年：2004
• 出版时间：November, 2004
• 年：2004
• 卷：63
• 期：2
• 页码：161-168
• 全文大小：243 K

文摘

The solubilities of three disperse azo dyes, 4-(N,N-dimethylamino)-4′-nitroazobenzene (D₁), 4-(N,N-diethylamino)-4′-nitroazobenzene (D₂) and Parared (D₃) in supercritical carbon dioxide have been measured at different temperatures (308, 318, 328, 338, 348 and 358K) and in the pressure range of 122–355bar. The measurements were performed using a simple static method. As evidenced from the experimental results, the solubilities increase with increasing density of supercritical CO₂. The solubilities in supercritical CO₂ decrease in the order D₂>D₁>D₃, which parallel the order of their relative melting points; the higher the melting point, the lower the solubility. The equilibrium solubility data were correlated using a semiempirical model. The calculated results show satisfactory agreement with the experimental data.