Separation of sulfuric acid and monosaccharides with a strong-base anion exchange resin containing polystyrenesulfonate as polymeric counter ion to reduce tailing of sulfuric acid

This paper describes the separation of sulfuric acid and monosaccharides with an amphoteric ion exchange resin to reduce the tailing of sulfuric acid. The amphoteric ion exchange resin of snake cage type was prepared by polymerizing p-styrenesulfonate ions contained in a strong-base anion exchange resin (Dowex 1X4) as counter ion. First, chloride form Dowex 1X4 (100-200 mesh) was changed into p-styrenesulfonate ion form. Then, p-styrenesulfonate ions in the resin were polymerized for 3 h at 72.5±2.5℃ and for more 3 h at 82.5±2.5℃ using a water soluble radical initiator. The resulting resin named Dowex 1X4-SS was treated with 1 M (M = mol dm^-3) NaCl and finally washed with water in a columnmode. FT-IR spectra and elemental analyses of Dowex 1X4-SS suggested its amphoteric structure of snake cage type. The separation of glucose and sulfuric acid was tested by using a column (i.d. 1.5 cm, resin bed length 29-30 cm) at 50℃. The tailing of sulfuric acid was markedly reduced in case of Dowex 1X4-SS, compared to that of the parent resin Dowex 1X4. In addition, the newly developed Dowex 1X4-SS successfully applied to the continuous separation of monosaccharides and sulfuric acid in concentrated sulfuric acid hydrolyzates of bamboo by means of a simulated moving bed chromatography. (author)