C - Chemistry – Metallurgy – 08 – H
Patent
C - Chemistry, Metallurgy
08
H
C08H 7/00 (2011.01) C07D 307/50 (2006.01) D21C 3/20 (2006.01) D21C 7/00 (2006.01) D21C 11/00 (2006.01)
Patent
CA 2101754
2101754 9213849 PCTABS00014 Filtrates from the bleaching and delignification of the pulp are recycled for reuse in pulping, separation, and recovery of lignin (66) and other by-products which results in significant energy savings and mitigation if not the elimination of pollution typically associated with bleaching. This invention also relates to products derived from the process and apparatus for carrying out the process. Lignins of various molecular weights and by-products of the pulping process are also recovered (66). The lignins are precipitated in high yields and at a high rate from a black liquor (40) produced by pulping wood at high temperature and pressures with an aqueous lower aliphatic alcohol solvent. As a by-product of this process a purified furfural product is recovered (71). This furfural may be recycled for use in the recovery of the low molecular weight lignin of this process.
Cronlund Malcolm
Gopal Goyal C.
Katzen Raphael
Leblanc Ron
Lora Jairo H.
Alcell Technologies Inc.
Borden Ladner Gervais Llp
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