Sulfite → HCID 19920498, compound

The hollow fiber contactor was used to treat condensate from a sulphite mill as described above. In this case, a 0.05 M NaOH solution was employed instead of nitrogen to remove the SO2 and other contaminants. A 2.0 L volume of this solution was re-circulated through the system. The feed solution and nitrogen flow rates were similar to those mentioned in Example III. Results are presented in Table V. About 98% removal for SO2 was achieved compared to 84% in Table II (after 4 hours using air). The BOD, COD and TOC reductions were 63%, 57%, and 54%, respectively. Higher NaOH concentrations would allow the concentration of SO2 produced in the form of NaHSO3/Na2SO3 to be significantly higher, if so desired. The NaHSO3/Na2SO3 solution could potentially be used within the mill or sold.

1. customto remove the SO2 and other contaminants
2. customResults
3. customAbout 98% removal for SO2
4. customwas achieved compared to 84% in Table II (after 4 hours using air)
5. concentrationHigher NaOH concentrations

ORD record

ord-68ed89538ff94350b6923c4ad90043c5

Source dataset

uspto-grants-2013_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08349130B2