Original scientific paper
https://doi.org/10.15255/CABEQ.2015.2279
A Novel Solid-acid Catalyst Using Sulfonated Crosslinked Chitosan Resin
C. L. Tang
; School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
L. P. Lv
; b)School of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling 408100, PR China; c)Research Center for Environmental Monitoring, Hazard Prevention of Three Gorges Reservoir, Yangtze Normal University, Fuling 408100, PR China
Y. T. Xu
; School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
Y. F. Tan
; School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
L. C. Dong
; School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, PR China
Abstract
Sulfonated crosslinked chitosan resins (SCCRs) were prepared by firstly crosslinking chitosan to crosslinked chitosan resins (CCRs) using a reverse emulsion crosslinking method, followed by sulfonating CCRs with concentrated H2SO4 as the sulfonation agent.
The properties and application of SCCRs as solid acid catalysts were studied. The acidic sites in SCCRs, including C6–O and C2–N sulfate groups, are all weak acidic sites. SCCRs of higher crosslinking degrees have a higher sulfonation rate of the C6 primary hydroxyl
groups, thus more C6–O sulfate groups. High-temperature treatment and TG analysis verified that the crosslinking can improve the thermostability of both SCCR backbone and its acidic groups, and a higher crosslinking degree leads to better thermostability.
Catalytic esterification of citric acid with butanol and propionic acid with n-butyl alcohol demonstrated that SCCRs have good catalytic activity and can be repetitively used as efficient solid acid catalysts.
Keywords
sulfonated crosslinked chitosan resin; solid acid catalyst; chitosan sulfate; crosslinked chitosan resin
Hrčak ID:
161810
URI
Publication date:
14.7.2016.
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