Switchable Carbamate Coagulants to Improve Recycling Ionic Liquid from Biomass Solutions

Julia Shamshina, Y Qin, K Belmore, D T Daly, R D Rogers

Research output: Contribution to journalArticlepeer-review


A reversible amine-carbamate approach has been developed to reduce the use of antisolvents such as water in the coagulation of biopolymers from ionic liquid (IL) solution and thus improve the economy of IL recycle. Cellulose and chitin were recovered from 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]) solution by introducing the miscible amines triethanolamine (TEA), ethylenediamine (EDA), or butylamine (BA) and bubbling CO2 at 40 °C and atmospheric pressure through the solutions to form carbamate salts in situ which resulted in biopolymer coagulation. BA gave the best results because of its low boiling point and low viscosity, which benefited both biopolymer recovery and IL recycle. Cellulose films and fibers could be formed by extrusion of an MCC/[C2mim]‐[OAc] solution into a coagulating bath comprised of a 1:1 M mixture of [C2mim][OAc] and butylammonium butylcarbamate (BA-carbamate). The cellulose, IL, amine, and CO2
Original languageEnglish
Pages (from-to)384-391
JournalGreen Chemical Engineering
StatePublished - 2021


Dive into the research topics of 'Switchable Carbamate Coagulants to Improve Recycling Ionic Liquid from Biomass Solutions'. Together they form a unique fingerprint.

Cite this