C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/26
C02F 9/00 (2006.01) B01J 41/04 (2006.01) C02F 1/28 (2006.01)
Patent
CA 1036723
A METHOD OF REDUCING THE EMISSION OF ORGANIC SUBSTANCES FROM CELLULOSE PLANTS ABSTRACT OF THE DISCLOSURE A method of purifying aqueous waste liquors from cellulose plants is provided, in which organic substances are sorbed on water-insoluble polymers, preferably cross-linked polymers, and recovered by elution, which comprises contacting with at least one organic anion exchanger a first aqueous waste liquor having a low content of inorganic anions such as sulphate and chloride and containing organic acids and organic nonionized substances and sorbing thereon organic acids and organic nonionized substances; and contacting a second aqueous waste liquor having a high chloride content and containing aromatic compounds, for example, waste liquor from chlorinating and chlorine dioxide bleaching stages, with at least one adsorption resin and sorbing aromatic compounds thereon while the chloride ions remain in the solution; eluting organic acids and organic nonionized substances by contacting the anion exchanger with an aqueous alkali solution; and eluting aromatic compounds by contacting the adsorption resin with an aqueous alkali solution. The same solution is utilized for each elution, in either order. The regenerated anion exchange and adsorption resins can then be re-used.
218550
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