A pretreatment process for electrodialysis alkali recovery in viscose fiber production
A technology of viscose fiber and electrodialysis, which is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of not fully considering the specificity of chemical components, low alkali recovery rate, etc., and achieve good flocculation effect, Reduce energy consumption and increase cost
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Embodiment 1
[0027] A pretreatment process for electrodialysis alkali recovery in viscose fiber production. The squeezed liquid with a NaOH content of 150g / L first removes large particles by electrocoagulation, and then enters the microporous filter through a pump, and then pumps the filtrate into Diffusion dialysis membrane separation system, the obtained dialysate is lye, the lye is recovered, and the concentrated liquid is the pretreated squeeze liquid for subsequent electrodialysis treatment.
Embodiment 2
[0029] A pretreatment process for electrodialysis alkali recovery in viscose fiber production. The squeezed liquid with a NaOH content of 50g / L first removes large particles by electrocoagulation, and then enters the microporous filter through a pump, and then pumps the filtrate into Diffusion dialysis membrane separation system, the obtained dialysate is lye, the lye is recovered, and the concentrated liquid is the pretreated squeeze liquid for subsequent electrodialysis treatment.
[0030] After pretreatment, the concentration of sodium hydroxide in the pressed liquid is 50g / L, and the content of semi-fiber is 20g / L.
Embodiment 3
[0032] A pretreatment process for electrodialysis alkali recovery in viscose fiber production. The squeezed liquid with a NaOH content of 200g / L first removes large particles by electrocoagulation, and then enters the microporous filter through a pump, and the filtrate is pumped into the Diffusion dialysis membrane separation system, the obtained dialysate is lye, the lye is recovered, and the concentrated liquid is the pretreated squeeze liquid for subsequent electrodialysis treatment.
[0033] After pretreatment, the concentration of sodium hydroxide in the pressed liquid is 200g / L, and the content of semi-fiber is 150g / L.
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