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PROCESS OF MAKING SULFONATED LIGNIN-BASED COMPOSITIONS, SULFONATED LIGNIN-BASED COMPOSITIONS SO-OBTAINED AND THEIR USE
Process for preparing a composition comprising a sulfonated lignin, including: preparing a lignin-containing aqueous suspension having a solids content up to about 45 wt % and a pH greater than about 6, by mixing a lignin with water; heating the aqueous suspension between about 65° C. and 160° C.; sulfonating the lignin using a sulfonating agent generating a sulfite ion and/or bisulfite ion, at a temperature of from about 90° C. to 160° C., at a sulfonation pH of from about 6 to 11 and at a molar ratio of sulfonating agent to lignin between about 0.1:1 and 1.5:1 on a sulfite to monomeric lignin sub-unit basis; and cooling the sulfonated lignin-containing resulting mixture. The sulfonated lignin, in aqueous mixture or as a powder, can be used as a dispersant in several products including for instance concrete, grout, mortar, oil-well cement, cement board, gypsum wallboard, agricultural products, drilling fluids, coal slurries.
PROCESS OF MAKING SULFONATED LIGNIN-BASED COMPOSITIONS, SULFONATED LIGNIN-BASED COMPOSITIONS SO-OBTAINED AND THEIR USE
Process for preparing a composition comprising a sulfonated lignin, including: preparing a lignin-containing aqueous suspension having a solids content up to about 45 wt % and a pH greater than about 6, by mixing a lignin with water; heating the aqueous suspension between about 65° C. and 160° C.; sulfonating the lignin using a sulfonating agent generating a sulfite ion and/or bisulfite ion, at a temperature of from about 90° C. to 160° C., at a sulfonation pH of from about 6 to 11 and at a molar ratio of sulfonating agent to lignin between about 0.1:1 and 1.5:1 on a sulfite to monomeric lignin sub-unit basis; and cooling the sulfonated lignin-containing resulting mixture. The sulfonated lignin, in aqueous mixture or as a powder, can be used as a dispersant in several products including for instance concrete, grout, mortar, oil-well cement, cement board, gypsum wallboard, agricultural products, drilling fluids, coal slurries.
PROCESS OF MAKING SULFONATED LIGNIN-BASED COMPOSITIONS, SULFONATED LIGNIN-BASED COMPOSITIONS SO-OBTAINED AND THEIR USE
LOISEAU FRANCIS (author) / DUPUIS MARIO (author) / TRIANTAFILLU IORDANA (author)
2022-08-18
Patent
Electronic Resource
English
IPC:
C07G
COMPOUNDS OF UNKNOWN CONSTITUTION
,
Verbindungen unbekannter Zusammensetzung
/
C04B
Kalk
,
LIME
/
C08L
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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Massen auf Basis makromolekularer Verbindungen
/
C09K
Materialien für Anwendungen, soweit nicht anderweitig vorgesehen
,
MATERIALS FOR APPLICATIONS NOT OTHERWISE PROVIDED FOR
| European Patent Office | 2023
| European Patent Office | 2021
| European Patent Office | 2021