Lecture 10 environment friendly dyeing of cotton

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]

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]

Lecture 10 environment friendly dyeing of cotton

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Lecture 10 environment friendly dyeing of cotton