kraft process


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kraft process

[′kraft ‚prä·səs]
(chemical engineering)
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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.
Pearl429 is produced using a continuous Kraft process versus a batch process used to make many other specialty pulps.
The kraft process is more flexible than the sulphite process in using the raw material base.
The dominant pulp-producing process in North America is the kraft process.
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%.
So the use of the kraft process for pulping wood expanded rapidly.
Application: This study identifies antiscalant chemicals that are effective for controlling calcium carbonate scale problems in kraft process liquors.