A Dissolution Kinetic Study of Disperse Dye in Supercritical Carbon Dioxide to Design an Efficient Supercritical Dyeing Process

Geonhwan Park,Youn-Woo Lee,Dong Eui Kwon,Wonbae Kong,Jimin Park

doi:10.3390/pr9060977

Geonhwan Park, Youn-Woo Lee + Show 3 more

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https://doi.org/10.3390/pr9060977

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Journal: Processes	Publication Date: May 31, 2021
Citations: 5	License type: CC BY 4.0

Affiliation: Seoul National University

Abstract

The dissolution behavior of dye in supercritical carbon dioxide influences the overall mass transfer that controls a supercritical dyeing process. Increasing the dissolution rate of the dye leads to shortening of the dyeing process time and can improve the efficiency of the process. Controlling the properties of the carbon dioxide flow is a good method to improve the dissolution rate of dyes. In this study, a dissolution kinetic model was designed by quantitatively analyzing and formulating the dissolution phenomenon of dyes using an in situ UV/Vis spectrometer. Through this model, the dissolution rate was compared by varying the geometric shape of the column containing the dye and the flow rate of carbon dioxide. Moreover, the correlation equation between the Reynolds number and Sherwood number was obtained through mass transfer coefficients derived under various conditions. In order to verify the utility of this equation, it was applied to a scaled-up device and the precise result could be predicted. This study can be useful in the design of dyeing processes and make-up equipment.

Highlights

Supercritical dyeing has been considered as a viable alternative to water-based dyeing, which leads to environmental pollution
The mass transfer coefficient of Disperse Red 60 (DR60) in the continuous supercritical system could be obtained from experimental results
Ratio of the dye column in which the dye and supercritical CO2 are in contact with each other, the dissolution rate of the dye was found to increase as the flow velocity increased

Summary

Introduction

Supercritical dyeing has been considered as a viable alternative to water-based dyeing, which leads to environmental pollution. This is because supercritical dyeing employs supercritical carbon dioxide as a dyeing solvent instead of water, avoiding the generation of wastewater that causes environmental pollution, and the use of other chemical substances, such as dispersants and surfactants. It is energy-efficient, as no additional drying process is required [1,2]. Supercritical dyeing is known to consist of the following processes: (1) Dissolution of the dye in supercritical carbon dioxide,

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