kraft process


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kraft process

[′kraft ‚prä·səs]
(chemical engineering)
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The kraft process is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibers, the main component of paper.
In addition, there exist various types of lignin, e.g., kraft softwood lignin, kraft hardwood lignin, organosolv lignin, and hydrolysis lignin (H-lignin) from kraft process, thermomechanical pulping (TMP)--bioprocess, and supercritical hydrolysis.
Black liquor is a byproduct of the production of paper pulp using the kraft process and is burned by paper companies to generate steam for the production of electricity.
Two participants in the Alberta BPS project, a Weyerhaeuser Kraft mill and a Husky refinery, discovered that spent caustic (NaOH) with contaminants from the refinery, which was being deep-well injected at a significant cost, could be used in a Kraft process, replacing virgin caustic purchased from Dow Chemical.
But a number of significant side streams of the main fibre line and process liquor cycle in kraft process pulp mills have significant combustive, explosive, or toxic characteristics.
In both soda AQ and kraft processes, cooking time can be reduced (from 120 min to 60 min in the kraft process and from 90 min to 60 min in the soda-AQ process).
There is some pollution associated with the chemical kraft process used to produce pulp from kenaf, though it is substantially less pollution than that of virgin wood pulping.
* The kraft process is more flexible than the sulphite process in using the raw material base.
The Kraft process, North America's most dominant pulping method, produces nearly 25 million tonnes of lignin per annum (191.
As far as the kraft process parameters are concerned, for the same kappa number (14, obtained by adjusting pulping time), the HexA content decreases when active alkali increases from 17% to 24% and increases with sulfidity in the range 15%-28%.