Alkali salt recovered from kraft process and its application as dyeing auxiliary
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Author list: Chiarakorn S., Pavavongsak R., Sangwatanaroj U.
Publisher: Elsevier
Publication year: 2011
Journal: Journal of Industrial and Engineering Chemistry (1226-086X)
Volume number: 17
Issue number: 3
Start page: 560
End page: 564
Number of pages: 5
ISSN: 1226-086X
Languages: English-Great Britain (EN-GB)
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Abstract
Recovered Boiler Ash (RBA) collected from kraft pulping process was purified using crystallization and evaporization methods. The study parameters were crystallization time (24, 48, 72 and 96h), crystallization temperature (-5ฐC and 5ฐC), evaporation temperature (50ฐC, 80ฐC and 100ฐC) and stirring effect. Results demonstrated that the maximum yield of crystallized compounds (CRBA) reached 68ฑ3wt.% when the crystallization was conducted at 5ฐC for 48h at pH 3 with no stirring, while that of evaporated compounds (ERBA) reached 95ฑ4wt.% when the evaporation was conducted at 100ฐC and pH 3 under stirring. The components found in RBA and all recovered salts were examined by inductively coupled plasma (ICP) spectrophotometry and ion chromatography (IC). It was found that RBA consisted of 80wt.% Na2SO4, 5wt.% NaCl and 1wt.% Na2CO3. After purification, CRBA and ERBA showed weight ratios of Na2SO4:NaCl:K2SO4 as 96.4:0.8:2.8 and 78.3:11.1:10.6, respectively. These results were in agreement with data from their X-ray diffractograms (XRD), differential scanning calorimetry (DSC) and specific densities. Due to the reasons of yield and cost saving, ERBA was utilized as an auxiliary for silk fabric dyeing. The dyeing was carried out using three commercial reactive dyes specially for silk dyeing: Cibacronฎ Red FN-R, Cibacronฎ Blue FN-R, Cibacronฎ Yellow FN-R. RBA and ERBA were used as auxiliaries at the concentrations of 30-60gL-1. The dyeing performances indicated that the best dyeing result was shown when 45gL-1 ERBA was used as auxiliary for silk fabric dyeing. ฉ 2011 The Korean Society of Industrial and Engineering Chemistry.
Keywords
Dye auxiliary, Recovered boiler ash, Recovery, Silk dyeing, Sodium sulfate
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