Aalto University Foundation Sr

Helsingin Yliopisto

Sanna Hellsten

Michael Hummel

Herbert Sixta

Ilkka Kilpeläinen

Jussi Helminen

Ville Alopaeus

Petri Uusi-Kyyny

Inge Schlapp-Hackl

Joanna Witos

Kadvaël Le Boulch

Alistair Wt King

Sherif Elsayed

K J Jussi Helminen

A Ilkka Kilpelainen

Alistair W T King

Kadvael Le Boulch

According to an example aspect of the present invention, there is provided a process for the production of a cellulose filaments or films, comprising the steps of dissolving a cellulose substrate in an ionic liquid consisting of the superbase cation 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-enium [mTBDH]+ and an anion to produce a solution forming a spinning dope, said anion being derived from an acid which is present at a stoichiometric excess to the superbase, extruding the spinning dope through a spinneret in a coagulation bath containing water to form filaments or films from the solution, withdrawing ionic liquid in an aqueous mixture with water from the coagulation bath, recovering the ionic liquid [mTBDH][OAc] from the aqueous mixture by removing water and optionally recycling the recovered ionic liquid to the dissolution step.

Recycling of acid-superbase conjugate ionic liquids by water removal in the lyocell spinning process

According to an example aspect of the present invention, there is provided A process for making a cellulose fibre or film comprising the steps of dissolving pulp in an ionic liquid containing a cationic 1,5,7-triazabicyclo[4.4.0]dec-5-enium [TBDH]+ moiety and an anion selected from the group according to Formula a), Formula b) and Formula c), wherein each of R, R, R, R, R, R, R, Rand Ris H or an organyl radical and Xis selected from the group consisting of halides, pseudohalides, carboxylates, alkyl sulphite, alkyl sulphate, dialkylphosphite, dialkyl phosphate, dialkyl phosphonites and dialkyl phosphonates, to provide a spinning dope, extruding the spinning dope through a spinneret to form one or more filaments, and a step selected from the group consisting of spinning cellulose fibres from the solution, and extruding a cellulose film from the solution.

Process for making cellulose fibre or film

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Aalto, Finland

Sanna Hellsten