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Corporate Profile

Papermaking xylanase GR-M208
Product description:

Papermaking xylanase GR-M208

Xylan is a major component of wood and non-wood fibers. During cooking of pulps, the xylan is partially dissolved, modified and re-precipitate onto the fiber surface. The application of the enzyme, xylanase, to the cooked pulp removes some of the re-precipitated xylan. This opens up the pulp matrix, allowing the release of trapped soluble lignin. At the same time it allows bleaching chemicals to penetrate more effectively. The overall result is improved bleachability of the pulp with resulting reduction in usage of bleaching chemicals.

GR-M208 Xylanase is an enzyme that degrades xylan. GR-M208 is specific for xylan and does not degrade cellulose. Xylanases produced by different microorganisms operate optimally over a range of pH and temperature. GR-M208 was developed from a proprietary strain of bacterium for the paper pulp industry. GR-M208 is particularly suited to the elevated temperatures and alkaline pH of kraft pulps.

The manufacturing process involves growing a specific proprietary bacterium in bioreactors (fermenters), separating the cells from the broth, and concentrating the clarified liquid. The product is prepared as a concentrated liquid or light brown powder. 

Process

GR-M208 acts as a pre-bleaching aid for paper pulps. GR-M208 has specific advantages in that it is stable and active at the alkaline pH and elevated temperatures typical of kraft pulps.

The main driving factors for acceptance of this technology in pulp mills have been the economic and environmental advantages over chemical bleaching.
GR-M208 used as a pre-bleaching agent for wood and non-woody pulps can reduce chemical bleach consumption from between 15 to 50%.    

Advantages

  • Reduce Organochlorines in Waste water: For mills using active chlorine as a bleaching chemical, GR-M208 can eliminate or substantially reduce the chemical and environmental load of toxic organochlorines in mill effluent.
  • Reduce Chemical bleaching agents Costs: For mills using environmentally friendly bleaching agents such as hydrogen peroxide, GR-M208 can result in a significant cost saving. 
  • Increase Pulp Production Capacity: Pre-bleaching pulps with GR-M208 allows pulp production capacity to be increased where on-site chlorine dioxide production is a limiting factor. 
  • Higher Pulp Brightness: For a given dosage of bleaching chemical, pre-bleaching with GR-M208 can give a higher brightness pulp, thus providing the mill with a better quality paper.
  • Easily Incorporated: GR-M208 is easily incorporated into existing bleach lines. Typically, installation requires only a mixing tank and dosage pump.
  • Reduce Effluent Load: Application of AU-PE89 in the bleach plant can reduce COD, BOD and color of effluent. GR-M208 can significantly reduce COD, BOD and color of effluent. 

Application

GR-M208 xylanase can be added to pulp after cooking or oxygen delignification and prior to bleaching for the improvement of pulp bleachability. Almost every mill has unique conditions of fiber furnish, pulping technology and bleach sequence. The optimal dosage can also depend on the temperature, pH and consistency of the pulp. Application protocols for GR-M208 can be tailored to best suit the specific process.

However, the following general application optimal conditions apply. 

 Dosage  40-50g/ T pulp (o.d.basis)
 Pulp properties  pH between 6.5 and 9.5
 Temperature  between 45 and 55°C
 Pulp viscosity  between 6 and 10% (recommended 8%)
 Residence time above 1 hour 

Storage

GR-M208 maintains its stated activity for at least six months when stored at temperatures below 25°C. The product maintains its activity for considerably longer when stored at lower temperatures. The product should not be frozen.

HANDLING PRECAUTIONS 

GR-M208 is non-toxic and biodegradable. However, unnecessary contact with the product should be avoided. Long term exposure to protein based products such as GR-M208 may sensitise certain individuals to the product.