Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
625409 | Desalination | 2010 | 5 Pages |
Abstract
The solvent extraction of methyl violet from aqueous acidic solutions by salicylic acid in xylene was studied. Inorganic acids such as hydrochloric acid (HCl), sulphuric acid (H2SO4) and nitric acid (HNO3) were used to adjust the pH of aqueous feed phase. HCl was shown to give higher efficiency of extraction and higher distribution coefficient at pH = 6.0 ± 0.1 than H2SO4 and HNO3. The distribution coefficient increased from 4 to 24 when salicylic acid concentration was increased from 1.4 Ã 10â 2 to 3.6 Ã 10â 2 mol Lâ 1. The presence of salt such as sodium sulphate (Na2SO4) in the feed phase decreased the extraction efficiency. The extracted dye was stripped into 9 mol Lâ 1 of aqueous acetic acid solution. The loading capacity was found to be 5.1 mg of dye per 3.6 Ã 10â 2 mol Lâ 1 of salicylic acid (25 mL of xylene contain 0.0125 g of salicylic acid).
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
G. Muthuraman, Tjoon Tow Teng,