两种偶氮型分散染料在超临界CO_(2)中溶解度拟合

Correlation of the solubilities of two azo disperse dyes in supercritical CO_(2)

为构建不同染料溶解度数据库,推进超临界二氧化碳(CO_(2))无水染色工业化应用,文章在温度为353.15~393.15 K、压力为12~24 MPa内研究了C.I.分散红54和C.I.分散蓝79的溶解性能。探究了在超临界CO_(2)体系中温度和压力对两种偶氮型分散染料溶解度的影响,并采用Chrastil、Mendez-Santiago-Teja(MST)、Bartle、Kumar-Johnston(K-J)和Sung-Shim(SS)溶解度经验模型进行拟合。结果表明:C.I.分散红54和C.I.分散蓝79的溶解度均随体系压力的升高而增加,5种模型拟合水平(R^(2))均较好;C.I.分散红54的SS模型溶解度拟合精度最好,平均相对偏差(AARD值)为2.88%,能更好地预测实验范围内其溶解度数值;C.I.分散蓝79的Chrastil和SS模型的拟合精度较好,AARD值均为12.92%,能较好地预测染料的溶解度。文章丰富了分散染料溶解度数据库,同时也为染料在超临界CO_(2)中拼色和配色提供了理论指导。

Supercritical CO_(2)fluid is an environmentally friendly medium that has been extensively used in textile dyeing and finishing process such as extraction,surface modification,and dyeing due to its high dispersibility and strong solubility.In addition,supercritical CO_(2)waterless dyeing technology has become a potential alternative for water bath dyeing due to its advantages,such as zero wastewater,high dye utilization rate,short dying process,and low energy consumption of the whole process.However,the adsorption,diffusion,color matching,color blocking as well as the process design and improvement of dyes on fibers,yarns,and fabrics are usually significantly affected by the dissolution behavior of dyes in supercritical CO_(2)during the dyeing process.Although related literature on this field of study shows extensive results on the measurement and correlation of dye solubility,these data cannot be used to guide production practices entirely due to the differences in test methods,equipment,fitting models,and standards.Hence,exploring the solubility of dyes and establishing a solubility database for different dyes in supercritical CO_(2)are crucial to improving the quality of textile waterless dyeing and accelerating the industrialization of supercritical waterless dyeing.This paper explores the solubilities of C.I.Disperse Red 54 and C.I.Disperse Blue 79 with a flow-type apparatus at temperatures ranging from 353.15 K to 393.15 K,and under the pressures ranging from 12 MPa to 24 MPa,and aims to build the solubility database of different dyes and promote the industrial application of supercritical CO_(2)waterless dyeing.The influence of temperature and pressure on the solubilities of two azo disperse dyes in the supercritical CO_(2)system was investigated.To better predict the solubilities of the dyes within the scope of experimental conditions,five empirical models were applied to fit the solubility data based on the relationship among different temperatures,pressures,and CO_(2)density.The solubilities of C.I.Disperse Red 54 and C.I.Disperse Blue 79 were correlated by Chrastil,Mendez-Santiago-Teja(MST),Bartle,Kumar-Johnston(K-J),and Sung-Shim(SS)solubility-based empirical models.The experimental results showed that the solubilities of the two dyes in supercritical CO_(2)were increased with pressures.The solubility of C.I.Dispersed Red 54 reached the maximum 10.16×10^(-6)mol/mol at 393.15 K and 24 MPa,and C.I.Dispersed Blue 79 obtained the maximum solubility of 7.16×10^(-6)mol/mol at 373.15 K and 24 MPa.Moreover,the solubility fitted results displayed that the calculated values by five empirical models exhibited satisfactory correlation with the experimental values.The outcomes pointed out that the corresponding(Chrastil,MST,Bartle,K-J,and SS models)average absolute relative deviations(AARD)of C.I.Disperse Red 54 were 6.74%,7.74%,6.96%,5.98%,and 2.88%,and the AARD values of C.I.Disperse Blue 79 were 12.92%,24.90%,19.04%,16.82%,and 12.92%,respectively.The SS model of C.I.Disperse Red 54 had the best solubility fitting accuracy,which could better predict the solubility value within the experimental range.Furthermore,the Chrastil and SS models of C.I.Disperse Blue 79 with AARD of 12.92%had better accuracy than the MST,Bartle,and K-J empirical models regarding the solubility.Thus,the solubility calculated with the Chrastil and SS models can supply a feasible approach for predicting the solubility values of C.I.Disperse Blue 79 within an experimental range and provide a technical support for supercritical waterless dyeing.This study enriches the solubility database of disperse dyes and provides theoretical guidance for color-matching dyes in supercritical CO_(2).Moreover,it is necessary to develop an accurate and efficient dye solubility test device and method,establish a suitable dye solubility prediction model,and form a dye dissolution behavior database in supercritical CO_(2).