Synthesis and Application of Phthalimidoperoxycaproic Acid

摘要

With their advantage of releasing active oxygen at the low washing temperatures in China and other Asian countries, peracids, especially those with long-chain, complicated hydrophobic groups, have potential as highly effective low-temperature bleaching agents. epsilon -Phthalimidoperoxycaproic acid was synthesized from phthalimidocaproic acid by oxidation with dilute hydrogen oxygen (30percent). Concentrated sulfuric acid or an organic sulfonic acid was used as catalyst. A mixture of two was effective in improving yield because of greater solubility of the precursor acids. Controlling the sulfuric acid content in the mixture to 60-70percent increased the solubility difference between the precursor and peracid and thus improved the yield. A change in the order of addition also affected the yield positively. With intermittent removal of water and reoxidation of the balance, reaction mixture yielded a crystalline product with an active oxygen content of 4.7-5.4percent Treatment of swatches stained with coffee or tea with a liquor containing commercial detergents and the synthesized peracid raised the whiteness by 12-17 units compared with -2.3percent1.1 units with commercial detergent alone.