title: Removing polysaccharides-and saccharides-related coloring impurities in alkyl polyglycosides by bleaching with the H2O2/TAED/NaHCO3 system.
abstract: The effect of H2O2/TAED/NaHCO3 system, namely NaHCO3 as alkaline agent with the (tetra acetyl ethylene diamine (TAED)) TAED-activated peroxide system, bleaching of alkyl polyglycosides solution was studied by spectrophotometry. The results showed that the optimal bleaching conditions about H2O2/TAED/NaHCO3 system bleaching of alkyl polyglycosides solution were as follows: molar ratio of TAED to H2O2 was 0.06, addition of H2O2 was 8.6%, addition of NaHCO3 was 3.2%, bleaching temperature of 50-65 °C, addition of MgO was 0.13%, and bleaching time was 8h. If too much amount of NaHCO3 was added to the system and maintained alkaline pH, the bleaching effect would be greatly reduced. Fixing molar ratio of TAED to H2O2 and increasing the amount of H2O2 were beneficial to improve the whiteness of alkyl polyglycosides, but adding too much amount of H2O2 would reduce the transparency. In the TAED-activated peroxide system, NaHCO3 as alkaline agent and buffer agent, could overcome the disadvantage of producing black precipitates when NaOH as alkaline agent.
authors.affiliation: Department of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300130, China; Research Center of Engineering Fluid and Process Enhancement, Hebei University of Technology, Tianjin 300130, China.
authors.forename: Liu
authors.initials: L
authors.lastname: Yanmei
authors.affiliation: Department of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300130, China; Research Center of Engineering Fluid and Process Enhancement, Hebei University of Technology, Tianjin 300130, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Jinliang
authors.affiliation: Department of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300130, China; Research Center of Engineering Fluid and Process Enhancement, Hebei University of Technology, Tianjin 300130, China.
authors.forename: Sun
authors.initials: S
authors.lastname: Jiao
authors.affiliation: Department of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300130, China; Research Center of Engineering Fluid and Process Enhancement, Hebei University of Technology, Tianjin 300130, China. Electronic address: cwy63@126.com.
authors.forename: Chen
authors.initials: C
authors.lastname: Wenyi
mesh_terms: D057886:Bleaching Agents / Q000737:chemistry*; D003116:Color; D005021:Ethylamines / Q000737:chemistry; D006027:Glycosides / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification; D017693:Sodium Bicarbonate / Q000737:chemistry*; D013696:Temperature
chemical_list: D057886:Bleaching Agents; D005021:Ethylamines; D006027:Glycosides; D011134:Polysaccharides; D017693:Sodium Bicarbonate; D006861:Hydrogen Peroxide
keywords: Acetic acid (PubChem CID: 176); Alkyl polyglycosides; Bleaching; H(2)O(2); Hydrogen peroxide (PubChem CID: 784); Magnesium oxide (PubChem CID: 14792); NaHCO(3); Peracetic acid (PubChem CID: 6585); Sodium bicarbonate (PubChem CID: 516892); TAED; Tetraacetylethylenediamine (PubChem CID: 66347)