Open AccessOptimization of Salt-Free Reactive Dyeing Process for Cotton with Coconut Oil/Water Dual-Phase Dyeing System
Author(s) -
Kattika Seemork,
Jantip Setthayad,
Potjanart Suwanruji,
Porntip Tooptompong
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23300
Subject(s) - dyeing , reactive dye , aqueous two phase system , chemistry , natural dye , pulp and paper industry , coconut oil , aqueous solution , orange (colour) , salt (chemistry) , organic chemistry , food science , engineering
In this study, the coconut oil/water dual-phase dyeing system for developing salt-free reactive dyeingprocess for cotton was established. The selected dyes in this work were hot-dyeing reactive dyes,including C.I. Reactive Red 243, C.I. Reactive Blue 214 and C.I. Reactive Orange 70. A dual-phasedyeing system was performed under various coconut oil to water ratios and a comparative study wasconducted on the conventional aqueous-based reactive dyeing in the presence and absence of salt. Theresults showed that the oil to water ratio of 3:1 imparted the highest colour yields (K/S values) andachieved a superior colour yield to the conventional aqueous-based dyeing. The results also pointedout that better dye fixation could be attained by dyeing cotton with the coconut oil/water dual-phasedyeing process under the optimum conditions. A comparable degree of dye exhaustion was observedfor the aqueous-based and the dual-phase dyeing processes, however, the dye fixation was higher forthe dual-phase dyeing, indicating less dye hydrolysis in this dyeing system. Consequently, superiorcolour fastnesses to washing and rubbing were obtained, less dye staining was observed in the case ofdual-phase dyeing. A study on reusability of the coconut oil recovered from the spent dyebath foranother reactive dyeing cycle was also conducted. The oil from the spent dyebath was directly taken touse without any further purification as a dual-phase medium along with water and the obtained resultindicated a reusability potential of coconut oil. From this research, it infers that cleaner reactive dyeingprocess with the coconut oil/water dual-phase system for cotton could be developed.