Ye Fang, Zhao Yuping, Mao Zhiping, Zheng Laijiu, Zheng Huanda, Ke Huizhen
Liaoning Provincial Key Laboratory of Ecological Textile, Dalian Polytechnic University Dalian 116034 Liaoning China
Fujian Key Laboratory of Novel Functional Textile Fibers and Materials (Minjiang University) Fuzhou Fujian 350108 China
RSC Adv. 2019 Dec 16;9(71):41511-41517. doi: 10.1039/c9ra06749c. eCollection 2019 Dec 13.
Acid Red 138, as a weak acid azo dye with a long alkyl chain, is widely used for protein fiber dyeing while it cannot dissolve in supercritical carbon dioxide. The objective of this study is to investigate the solubility of Acid Red 138 with water at the temperatures of 353.15, 363.15, 373.15, 393.15 and 413.15 K and over a pressure range of 20 to 26 MPa. The test results revealed that the phase equilibrium of water and Acid Red 138 was affected by the competition between pressure and density of supercritical carbon dioxide. Furthermore, the experimental solubilities were correlated by three types of density-based model. Good agreement with less than 3.36% of average absolute relative deviation between the calculated and the experimental data of water was achieved. In addition, the Chrastil model, Mendez-Santiago-Teja model and Sung-Shim model exhibited excellent correlation results for Acid Red 138 solubilities with the AARD values of 8.58%, 6.06% and 5.19%. Better understanding of the solubility behavior of Acid Red 138 in supercritical carbon dioxide displays potential for developing a microemulsion system for the eco-friendly dyeing of natural fibers.
酸性红138作为一种带有长烷基链的弱酸偶氮染料，广泛用于蛋白质纤维染色，但它不能溶解于超临界二氧化碳。本研究的目的是研究酸性红138在353.15、363.15、373.15、393.15和413.15K温度以及20至26MPa压力范围内与水的溶解度。试验结果表明，水和酸性红138的相平衡受超临界二氧化碳压力和密度之间竞争的影响。此外，通过三种基于密度的模型对实验溶解度进行了关联。计算值与水的实验数据之间的平均绝对相对偏差小于3.36%，吻合良好。此外，Chrastil模型、Mendez-Santiago-Teja模型和Sung-Shim模型对酸性红138溶解度的关联结果优异，平均绝对相对偏差值分别为8.58%、6.06%和5.19%。更好地了解酸性红138在超临界二氧化碳中的溶解行为，为开发用于天然纤维环保染色的微乳液体系展现了潜力。
