Enzymatic Prebleaching of Dissolving Grade and Paper Grade Kraft Pulps

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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