Sulfonated carbon as a new, reusable heterogeneous catalyst for one-pot synthesis of acetone soluble cellulose acetate

Lakhya Konwar, Päivi Mäki-Arvela, Ashim Jyoti Thakur, Narendra Kumar, Jyri-Pekka Mikkola

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

A sulfonated carbon (SO3H/PhSO3H-carbon) catalyzed novel process was developed for the solvent free synthesis of acetone soluble-cellulose acetate (CA) via acetylation of cellulose with acetic anhydride. The SO3H/PhSO3H functionalized carbons easily outperformed the traditional solid acids (zeolites, heteropoly acids, Amberlyst-15 etc.) producing acetylated products with DS values between 1.6 and 2.94, in high yield (48–77% isolated yield) and under solvent free conditions, in a one-pot process. Further, it was possible to produce the commercially desired, soluble CA (DS values 2–2.7) in excellent yields (∼70%) from microcrystalline cellulose under optimized reaction conditions over the highly active mesoporous sulfonated catalyst (AC500S). A catalyst-to-cellulose (w/w) ratio of 1, acetic anhydride-to-AGU (anhydroglucose unit) mole ratio of 4.5 and reaction time of 12 h was applied. Additionally, the sulfonated catalyst could be easily recovered by centrifugal separation of the reaction mixture (diluted with acetone) and subsequently applied in the next reaction cycle with no significant reduction in yield and DS of CA over multiple reaction cycles.
Original languageUndefined/Unknown
Pages (from-to)8829–8837
JournalRSC Advances
Volume6
Issue number11
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

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