Delignification

delignification

[dē‚lig·nə·fə′kā·shən]
(chemical engineering)
A chemical process for removing lignin from wood.

Delignification

 

destruction of the lignin that fills the intermycelial spaces in the walls of plant cells. Delignification occurs in a dead cell through the activity of enzymes secreted by neighboring living cells or parasitic fungi that cause, for example, white rot of woody plants. In the stalks of herbaceous plants, the process precedes obliteration and destruction of the internal elements of the protoxylem. Delignification and subsequent thinning of the sclereid walls accompany the maturation of pears and quinces. Delignification is used in industry to obtain cellulose; the lignin is removed from the cell walls by boiling wood at high pressure with caustic soda or calcium bisulfite. Delignification may also be caused by the action of Schultze powder (nitric acid with Berthollet salt) on the cell walls.

References in periodicals archive ?
GL&V's washing, oxygen delignification and bleaching operations with Compact Press, pumps and mixers technology for chemical pulping as well as the related Product Center in Karlstad Sweden are not included in the transaction scope.
Enzyme application will include the recovery of phenolic compounds from enzymatic breakdown of technical lignin, And of lignin and hemicellulose compounds from enzymatic delignification and bleaching of kraft pulp (also resulting in more sustainable final cellulosic pulp).
Therefore, to break down lignocellulosic bonds and to increase the bioavailability of nutrients, various physical and chemical delignification methods have been examined in agricultural co-products, such as rice straw and wheat straw [2,3].
Optimal conditions sawdust delignification of Pinus patula as crucial step in obtaining bioethanol
In the pulp and paper industry, PAA has been found to be an excellent alternative for delignification and bleaching [3], though this market is still small.
The reason for this may be that the higher alkali concentration weakens the fiber by excess delignification [25].
Considering the high efficiencies of delignification as well as good oxidizing selectivity, direct application of the ozonation method on the pretreatment of the unbleached Kraft pulp instead of pure cellulose fibers for the NFC preparation would be feasible.
Bearing in mind that the lignin polymer represents a structural barrier to these effects, first it was necessary to perform the delignification of LVS biomass.
Gogate, "Alkaline and ultrasound assisted alkaline pretreatment for intensification of delignification process from sustainable raw-material," Ultrasonics Sonochemistry, vol.
Gonsalves, "Mass balance of pilot-scale pretreatment of sugarcane bagasse by steam explosion followed by alkaline delignification," Bioresource Technology, vol.