Akm. Jamaluddin et al., APPLICATION OF NANOFILTRATION TO SEPARATE SALTS FROM A HYDROGEN-SULFIDE SCRUBBER SOLUTION, Canadian journal of chemical engineering, 71(3), 1993, pp. 377-382
Experiments were carried out using nanofiltration to separate salts fr
om a hydrogen sulphide scrubber solution taken from an iron-based liqu
id-redox process. The scrubber solution used in these experiments cont
ained organic chelating agents, iron, and various alkali metal inorgan
ic salts (i.e., sulphates, thiosulphates, carbonates, and bicarbonates
). The nanofiltration unit was equipped with monovalent ion-selective
membranes. Results indicated that the nanofiltration membranes retaine
d organic materials and iron and allowed ionic species (e.g., SO42-, S
2O3-, CO32-, HCO3-) to permeate. Results also indicated that the nanof
iltration membranes used in these experiments preferentially removed C
O32- and HCO3- over SO42- and S2O32-. The nanofiltration tests did not
show any sign of membrane degradation in terms of ion selectivity; ho
wever, at high total-dissolved solids concentrations, the permeate flo
w rate was reduced.