The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2025
Filed:
May. 19, 2021
Recycling of acid-superbase conjugate ionic liquids by water removal in the lyocell spinning process
Aalto University Foundation SR, Aalto, FI;
Herbert Sixta, Aalto, FI;
Sherif Elsayed, Aalto, FI;
Inge Schlapp-Hackl, Aalto, FI;
Joanna Witos, Aalto, FI;
Sanna Hellsten, Aalto, FI;
Petri Uusi-Kyyny, Aalto, FI;
Michael Hummel, Aalto, FI;
Ville Alopaeus, Aalto, FI;
Aalto University Foundation sr, Aalto, FI;
Abstract
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.