Innovations in dyeing of cotton with indigo
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The document discusses innovations in dyeing cotton with indigo. It investigates using organic alkalis instead of sodium hydroxide (NaOH) in the indigo dyeing process. The study finds that organic alkalis produce higher color yields than NaOH and keep the indigo dye solution stable for longer. Organic alkalis are also more environmentally friendly as they reduce effluent load and dye consumption compared to NaOH. The document also explores using iron(II) salt complexes as alternative, eco-friendly reducing agents to sodium hydrosulphite in the indigo dyeing process.
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Innovations in dyeing of cotton with indigo
- 1. INNOVATIONS IN DYEING OF COTTON WITH INDIGO R.B.CHAVAN, S.JAHAN, J.N.CHAKRABORTY Department of Textile Technology Indian Institute of Technology Hauz-Khas, New Delhi 110016
- 13. NaOH Equivalence of Organic Alkalis 2.43 3.81 2.24 2.94 Organic Alkali I Organic Alkali II Organic Alkali III Organic Alkali IV NaOH Equivalence (1gm) Organic Alkali
- 15. Effect of Different Alkalis on Indigo Dye bath Stability and Colour Build up 100/15 110.0 63.5 104.6 124.4 100/14 121.1 - 137.5 155.8 100/14 118.6 148.5 140.1 146.1 100/13 133 155 133.6 143.1 100/13 128 142 131 139 NaOH Organic Alkali I Organic Alkali II Organic Alkali III Organic Alkali IV 8hrs 6hrs 4hrs 2hrs 0hrs Alkali
- 17. CHANGE OF pH WITH TIME BEFORE PADDING 11.4 10.3 9.6 10.1 10.2 11.4 10.5 10.0 10.4 10.5 11.5 10.6 10.3 10.5 10.5 11.6 10.7 10.5 10.7 10.6 12.3 10.8 10.6 10.8 10.8 NaOH Organic Alkali I Organic Alkali II Organic Alkali III Organic Alkali IV 8hr 6hr 4hr 2hr 0hr Alkali
- 19. Effect of Number of dips on Alkali Consumption 17.5 15.8 14.8 29.9 16.2 14.3 12.2 28.1 15.0 13.1 9.5 20.5 12.5 11.8 8.7 21.8 11.2 9.2 7.8 18.7 10 7.9 6.9 12.5 NaOH Organic Alkali I Organic Alkali III Organic Alkali IV 6 5 4 3 2 1 % Consumption of alkali after each dip Alkali
- 21. Effect of Number of dips on Na 2 S 2 O 4 Consumption 89.2 89.0 81.7 83.0 78.5 80.8 79.8 76.7 67.8 80.0 73.1 67.8 60.7 74.5 67.3 58.9 53.5 67.2 61.5 53.6 48.2 52.0 40.3 37.5 NaOH Organic Alkali I Organic Alkali III Organic Alkali IV 6 5 4 3 2 1 % Consumption of Na 2 S 2 O 4 Alkali
- 24. SIMULATION OF COMMERCIAL DYEING PRACTICE 11.9 10.7 16.3 19.7 12.3 10.9 16.7 20.7 NaOH Organic Alkali I pH K/S pH K/S Sample of the 7 th day Sample of the 1 st day Alkali
- 29. Fe(OH) 2 AS REDUCING AGENT