Information profile @ a Glance
- Sulfur dyes are synthetic organic substantive dyes for cellulosics ;
sulfur black is one
- These are water insoluble dyes and have no affinity for the
celluloses
- Sulfur dyes are water insoluble compounds that have to be converted
during the dyeing process first into a water-soluble form and then to a
reduced form to enable fixing of the dye on the fiber to be dyed
- Converting the original dye into water solubility is by treatment
with an aqueous solution of highly polluting sodium sulfide. This causes
an increase in the sulfide content of the mill's effluent. On account of
its toxicity the State Pollution Control Board prescribes a limit of
2ppm for sulfide in the treated effluent. Complying with these standards
was one of the major problems
- After dyeing the fabric, the dye is converted back to insoluble form
with acidified dichromates to prevent washing out of the dye from
fabric; dichromates are toxic too
- Regulations are in place to enforce pollution control in almost all
the countries including India
- Chemical Substitution of these chemicals has been done and clean
production was achieved and pollution control reached
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Basic Information
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About Sulphur Black
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Sulfur Black specification
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Dyes and Fibres
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Textile Chemistry & Dyeing
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Environmental Legislation
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Sulfur dyeing
Case Studies
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Company - Mumbai
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Companies - Egypt
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Double Black Dyeing
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The Western Dye Industry
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Sulphur Black Dyeing
Technology Information
- Sulfur Dyeing
- Non-Sulfide Reducing agents
- Ecological Sulphur Dyeing
- Sulphur dye concentration control
- New sustainable range of dyestuffs for textile
and paper dyeing
- Dye Removal from Wastewater Using Iron
Salts
- Ozonation of textile effluents and dye
solutions
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Environment Protection
- The problem & Solution
- Cleaner Production Assessments
- Alternate production for Pollution
Reduction
- Reduction of sulfide in effluent from sulfur
black dyeing
- Biological Treatment of Textile Effluent in
Stirred Tank Bioreactor
- Textile Industry Chronicle
- Chinese Material
- The dyeing process and how we can improve
environmental impacts
- Oxidative treatment
- Zero Discharge
Project Information
- Technical Consultants
- Reducing water and chemical use
- Consultant - technical
- Dyeing Equipments supplier
- Laboratory Services
- Project Contacts & Links
- Dye Manufacturer
- Dyeing Machinery for Denim
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