SE547179C2 - Method for producing thermally stabilized agglomerated lignin and method for producing a carbon enriched material from said lignin - Google Patents

Abstract

The present invention relates to a method for producing completely thermally stabilized agglomerated lignin, the method comprising the steps of a) providing agglomerated lignin having an average particle size in the range of from 50 to 500 pm; and b) heating the agglomerated lignin to a temperature in the range of from 140 to 300 °C for a time period of at least 30 minutes, so as to obtain completely thermally stabilized agglomerated lignin. The present invention also relates to completely thermally stabilized agglomerated lignin and a method for producing a carbon enriched material obtained by subjecting the completely thermally stabilized agglomerated lignin to heat treatment.

Claims (15)

Claims íïwllarkeszbtsp aafïierëszlmentsš A method for producing completely thermally stabilized agglomerated lignin, said method comprising the steps of: sæšee-providing agglomerated lignin having an average particle size in the range of from 50 to 500 um. :rr 'r Éfgsš* '“ ,ft“.fi“ Ert titt? ^ .x-å ~. F; f? . ."~\-» -.\\~ w ~. _ h. _ ef... -šßw -\-.~.- i.-«.i iï -t K» _. ,.-,-\ .L--Lfif-l i» <4- -. .-\\ 'ï-» ..-_» -_ .v \. i~n..._ ~_.t ..-_- . .w _ ..t_. . . .~ _.. » _ . :- . \_ . m» , , ~ \\_,¿;~ ~ :y ~ 5 ~ ~ ~ \ E u: ~ ~ t- utv-ft: e ~ ut m* ~ t , ëgfi ._ t; s» t t . .\,.- . J, h . .\. .ta .1 i ä m . Q \ st f ~ .» \ , fm. .Låg .w šI.-.\»\{,, It» .áfifiN ~{._-.\~..\. I n -\.~\ Qu-Lfitt. :wc _. ._ . _ . . . w t. \--¿\ .-~.~ -~i.-\.-~i.-~.š-'~ -- t-l ~ :V ~ ï t-M-n-h-šf-.ß 'M .- hév-Åw -\.-~.- ~ -w-Å- -ï lï-w-š-v Q .»~-~.~E~i~\»\ èk-x »vw-tfifizf Vä' lim. in »w Mm + f 5- +-.3~ mw J »vwww *m4 iímwšw t. _ . .F .-~ Q. ._ . t. ._ _ cšg, . av _¿,.... h.- '- w w» .- ..«\.-.~ -. -tnfiflr : ..;-f. :iv .~ w .- Ai iw- »w ë*'-'\ :-. FFKN -- -t- and ,.._t....¿_ . _ \_ . . up. F. ._ ,\.. . _\...\. .._. .tflxiu \_ .i ...1 . . . _ E .., b; heating the agglomerated lignin to a temperature in the range of from 140 to 300°C for a time period of at least 30 minutes, so as to obtain completely thermally stabilized agglomerated ligninå ctaarasteršsed lst: that the a-:a-:tlorrterate-:E lšcmàn ensvšijefiš än step a) e .-\\~.“_. ~...'~.--~ ~«;u,:- 'lf kr* ' . :'*'>.«~.,-',.~^ » “ czë-ëfiÉï-t-F. ïštsšk šlšzëšïïšzl. - :ii ïšizš :àšïif-t? (Y: Éšíšëïï. xi-'Åï ÉÛ xšfê: mLÜ-šïï* äfïiflš >:--\-\'-šš§>*šïš¥š--g§}§§ . i.i'. ., _.. ' ï..'.....-..Z.'.-..'“.. -.'. ..\'.\. . ~ .,._." , q . . gšgggïï-Pwëfrr W f' ïr-yf* :sv Mä' se w as -tf-:tsfaaatït-:tfi m* a metšsatš . t _. -.. _. ~' . , ,. _: _ _. t. :Witt - ssazassni se as to flstms: .~->. :_ \.,., ~ .:., :_ _. .. .-:~:~.., -~- íšàïïxïlkflïïêšcšïëšï šëïxïšïššï šEc:\-'.=ï'k“- ä? cšx-'tš-'izïïxëkë Ücïïiëíïšê “šlfišï :šš Éfitf šfiåšïí-šzëï Gi ÉSÛEEÉ ”VThe method according to claim 1, wherein the method for producing agglomerated lignin comprises the additional steps of: - providing at least one additive; and - mixing the lignin powder with the at least one additive. The method according to any one of the preceding claims, wherein the agglomerated lignin provided in step a) has a bulk density in the range of from 0.5 to 0.7 g/cma. . .gi 42... \.\.\ «'\ .i 5,.. The method according to any one of the preceding claims, wherein the lignin is kraft lignin. The method according to any one of the preceding claims, wherein the heating of the agglomerated lignin in step b) is carried out by first heating the agglomerated lignin to a temperature in the range of from 140 to 175°C for a period of at least 15 minutes and subsequently heating the agglomerated lignin to a temperature in the range of from 175 to 300°C for at leastminutes. The method according to any one of the preceding claims, wherein the heating of the agglomerated lignin in step b) is carried out in an oxidative atmosphere. A method for producing a carbon enriched material, said method comprising the steps of:

1. providing a completely thermally stabilized agglomerated lignin obtainable by the method according to any one of claims 1-6;

2. subjecting the completely thermally stabilized agglomerated lignin to heat treatment at one or more temperatures in the range of from 300 to 1500°C, wherein the heat treatment is carried out for a total time in the range of from 30 minutes to 10 hours, so as to obtain a carbon enriched material; and

3. optionally pulverizing the obtained carbon enriched material. The method according to claim 7, wherein step 2) comprises a preliminary heating step, followed by a final heating step. The method according to claim 8, wherein the preliminary heating step is carried out at a temperature between 400 and 800°C for at least 30 minutes. The method according to any one of claims 8 or 9, wherein the preliminary heating step is carried out in inert atmosphere. The method according to any one of claims 8-10, wherein the final heating step is carried out at a temperature between 800 and 1500°C for at leastminutes. The method according to any one of claims 8-11, wherein the final heating step is carried out in inert atmosphere. The method according to any one of claims 7-12, wherein the carbon enriched material obtained in step 2) has a true density in the range of from 1.7 to 2.0 g/cm A negative electrode for a non-aqueous secondary battery comprising the carbon enriched material obtainable by the method according to any one of claims 7-13 as active material. Use of the carbon enriched material obtainable by the method according to any one of claims »läl-fliwas active material in a negative electrode of a non-aqueous secondary battery.