Enzymatic Prebleaching of Dissolving Grade and Paper Grade Kraft Pulps
Introduction
The process has been developed for prebleaching of dissolving grade kraft pulp of hardwoods and paper grade kraft pulp of variety of Indian raw materials viz. hardwoods, bamboo, mixture of hardwoods and bamboo with xylanase enzyme. Pretreatment of pulps with xylanases prior to bleaching reduces bleach chemical requirements or permits higher brightness and whiteness to be reached. Reduction in chemical charges translates into significant cost savings when high level of CIO2 is used. Reduction in use of elemental chlorine reduces the formation and release of environmentally harmful chlorinated organic compounds (AOX) in the effluent.
Environmental Aspects
No adverse environment impact is envisaged. The technology helps in reduction of organochlorine compounds. Pulp and Paper industry, Dissolving grade pulp industry, bleaching Reduction in expensive chlorine dioxide by 4-5 kg/ton pulp - Cost saving Reduction in elemental chlorine by 25% (10 kg/ ton pulp) resulting in 25% reduction in AOX in the effluent - reduction in pollution loadIncrease in brightness and whiteness by upto 2 and 5 points respectively (depending upon raw material, pulping process and bleaching sequence etc.) - Quality improvement with very little investment Increased pulp production in case of chlorine dioxide limitation Increase of chlorine dioxide substitution in the first bleaching stage in order to meet environmental requirements
Know-how fee
Negotiable, on sharing of the savings/ profits basis
Training fee
Between Rs. 50,000 (US$ 1200) to Rs. 100,000 (US$ 2400)
Production Capacity
The technology can be absorbed in any existing or proposed capacity by the pulp and paper mills.
Stage of Development
Patented,Launch Phase
Inputs Required: Raw Materials
Enzymes
Transfer Forms
Know-how,Sale of patent,Consultancy,Technical Assistance,Training
Main Application
Textile
For further information please contact
Technology Bureau for Small Enterprises
APCTT Building, Qutub Institutional Area
P.O. Box – 4575
New Delhi – 110016, India
