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Lecture 10 environment friendly dyeing of cotton

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Adane Nega
Adane Nega
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ENVIRONMENT FRIENDLY DYEING OF COTTON R.B.CHAVAN Department of Textile Technology Indian Institute of Technology Hauz-khas, New Delhi 110016 E-mail: rbchavan@hotmail.com
PRESENT CONCEPT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ENVIRONMENT FRIENDLY CHEMICAL PROCESSING Input / output analysis of Textile chemical Processes Textile Auxiliaries Dyes Base chemicals (e.g. acid, Alkali, sodium chloride) Textile Energy Natural Fibres; 10-20 MJ/kg Chemical Fibres: 5-50 MJ/kg Water 60-360 l/kg textile Polluted Air Water Effluent Waste Sewage sludge: 60-70 g/kg textile Wet Processing (pre-treatment, dyeing, printing, finishing.)
ENVIRONMENT FRIENDLY DYEING ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
REACTIVE DYES ,[object Object],[object Object],[object Object]
Typical dye fixation on different fibres
ALTERNATIVE METHODS FOR LOW COLOUR IN EFFLUENT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BIFUNCTIONAL REACTIVE DYES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
BIFUNCTIONAL REACTIVE DYES
LOW SALT REACTIVE DYES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
EFFECT OF SALT ON ENVIRONMENT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
APPROACHES TO SOLVE PROBLEMS OF SALT LOAD ,[object Object],[object Object],[object Object]
GENERAL STRUCTURE OF LOW SALT REACTIVE DYES CHROMOPH-ORE CHROMOPHORE BRID-GE REACT-IVE GROUP REACT-IVE GROUP
ADVANTAGES OF HIGH DYE FIXATION Conventional dyes 60 % fixation Cibacron LS (bireactive) 80 % fixation 200 gm into the waste water 800 gm on the fibre 1 kg dye + 33% % - 50% % 1 kg dye 600 gm on the fibre 400 gm into the waste water
ECOLOGICAL BENEFITS OF LOW SALT REACTIVE DYES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ECO FRIENDLY REDUCING AGENTS FOR VAT DYES ,[object Object],[object Object],[object Object],[object Object],[object Object]
ALTERNATE REDUCING SYSTEMS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ELECTROCHEMICAL REDUCTION ,[object Object],[object Object],[object Object]
IRON COMPLEXES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
STUDY AT IIT DELHI R.B.chavan, J.N.chakraborty ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SULPHUR DYES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
OXIDATION ,[object Object],[object Object],[object Object],[object Object]
Na 2 S REPLACEMENT ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
CONCLUSION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Lecture 10 environment friendly dyeing of cotton

  • 1. ENVIRONMENT FRIENDLY DYEING OF COTTON R.B.CHAVAN Department of Textile Technology Indian Institute of Technology Hauz-khas, New Delhi 110016 E-mail: rbchavan@hotmail.com
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  • 3. ENVIRONMENT FRIENDLY CHEMICAL PROCESSING Input / output analysis of Textile chemical Processes Textile Auxiliaries Dyes Base chemicals (e.g. acid, Alkali, sodium chloride) Textile Energy Natural Fibres; 10-20 MJ/kg Chemical Fibres: 5-50 MJ/kg Water 60-360 l/kg textile Polluted Air Water Effluent Waste Sewage sludge: 60-70 g/kg textile Wet Processing (pre-treatment, dyeing, printing, finishing.)
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  • 6. Typical dye fixation on different fibres
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  • 13. GENERAL STRUCTURE OF LOW SALT REACTIVE DYES CHROMOPH-ORE CHROMOPHORE BRID-GE REACT-IVE GROUP REACT-IVE GROUP
  • 14. ADVANTAGES OF HIGH DYE FIXATION Conventional dyes 60 % fixation Cibacron LS (bireactive) 80 % fixation 200 gm into the waste water 800 gm on the fibre 1 kg dye + 33% % - 50% % 1 kg dye 600 gm on the fibre 400 gm into the waste water
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