Patent Number: 8,877,007

Title: System and method for reclaiming rejects in sulfite pulping

Abstract: Systems and methods are provided for refining and reclaiming rejects in a sulfite pulping process. Wood chips and sulfite cooking liquor are provided to a digester for delignification. The slurry obtained from the digester is screened to obtain a reject portion containing sulfite rejects. The sulfite rejects are disintegrated in a refiner, such that the rejects are refined to a freeness suitable for digestion in a subsequent re-cooking step. Refined rejects are then returned to the digester for re-cooking with wood chips.

Inventors: Ni; Yonghao (Fredericton, CA), Kang; Guojun (Fredericton, CA)

Assignee: University of New Brunswick

International Classification: D21C 3/06 (20060101)

Expiration Date: 2019-11-04 0:00:00