期刊
JOURNAL OF CLEANER PRODUCTION
卷 24, 期 -, 页码 149-158出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2011.11.062
关键词
Indigo reduction reaction; Sodium dithionite; alpha-Hydroxycarbonyls; Reducing properties comparison; Indigo dyeing processes; Cleaner production
Nowadays, in most indigo dyeing processes the reduction step is performed chemically by sodium dithionite. This is considered environmentally unfavourable because of the resultant contaminated wastewaters. So, there has been interest to find new possibilities which would be ecologically more attractive to reduce indigo. In this paper, a comparison between sodium dithionite and some ecofriendly alpha-hydroxycarbonyls was effectuated. The examples of glucose (such as an alpha-hydroxyaldehyde), acetol and acetoin (such as an alpha-hydroxycetone) were treated. This comparison was based on redox potential measurements taken in absence and in presence of indigo under several conditions of temperatures, molar concentrations of studied reducing agents and sodium hydroxide. A thermodynamic study was also released in order to evaluate more precisely the reducing properties of each reductant by calculating the equilibrium constant of reduction reaction K-r. The dyeing performances resulted from the reduction of indigo by each one of the studied reducing agents were appreciated by measuring the colour yield (K/S). The obtained results showed that alpha-hydroxycarbonyls could offer an environmentally safe alternative to sodium dithionite as a reducing agent in indigo dyeing processes. (C) 2011 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据