Examining the effectiveness and the environmental impact of rinsing in reactive dyeing


Anis P., Eren H.

AATCC REVIEW, vol.1, no.6, pp.24-29, 2001 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 1 Issue: 6
  • Publication Date: 2001
  • Title of Journal : AATCC REVIEW
  • Page Numbers: pp.24-29

Abstract

Reactive dyes establish a covalent bond with the fiber, resulting in greatly advantageous washfast properties. However, reactive dye molecules also react undesirably with the hydroxyl ions in the water, and thus form a non-reactive hydrolyzate. In fad, utilization of 60-80% is common. Furthermore, due to their relatively low yield and their high electrolyte requirement, these dyes contribute to dye effluent and salt loading. Since yields are generally 50-80% (batch dyeing), bireactive, high fixation dyes have been developed to achieve yields of 80-90% (exhaust process). To achieve the desired washfast-ness, the remaining 20-40% of hydrolyzate must be washed during rinsing.(1-3) Even 800 mg/L of hydrolyzate may remain in a dyebath.(4-6)