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

Herbert Sixta; Sherif Elsayed; Inge Schlapp-Hackl; Joanna Witos; Sanna Hellsten; Petri Uusi-Kyyny; Michael Hummel; Ville Alopaeus

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

Herbert Sixta (Inventor), Sherif Elsayed (Inventor), Inge Schlapp-Hackl (Inventor), Joanna Witos (Inventor), Sanna Hellsten (Inventor), Petri Uusi-Kyyny (Inventor), Michael Hummel (Inventor), Ville Alopaeus (Inventor)

Research output: Patent

Abstract

According to 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-l,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.

Original language	English
Patent number	EP4153800
IPC	C08J5/18,D01F13/02,D01F2/02
Priority date	19/05/2020
Filing date	19/05/2021
Publication status	Submitted - 29 Mar 2023
MoE publication type	H1 Granted patent

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

abstract = "According to 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-l,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.",

author = "Herbert Sixta and Sherif Elsayed and Inge Schlapp-Hackl and Joanna Witos and Sanna Hellsten and Petri Uusi-Kyyny and Michael Hummel and Ville Alopaeus",

note = "Also published as US20230203717 and WO2021234226; EP4153800; C08J5/18,D01F13/02,D01F2/02",

year = "2023",

month = mar,

day = "29",

language = "English",

type = "Patent",

}

TY - PAT

T1 - Recycling of acid-superbase conjugate ionic liquids by water removal in the lyocell spinning process

AU - Sixta, Herbert

AU - Elsayed, Sherif

AU - Schlapp-Hackl, Inge

AU - Witos, Joanna

AU - Hellsten, Sanna

AU - Uusi-Kyyny, Petri

AU - Hummel, Michael

AU - Alopaeus, Ville

N1 - Also published as US20230203717 and WO2021234226

PY - 2023/3/29

Y1 - 2023/3/29

N2 - According to 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-l,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.

AB - According to 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-l,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.

M3 - Patent

M1 - EP4153800

Y2 - 2021/05/19

ER -

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

Abstract

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