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Method of recovering furfural from organic pulping liquor
| Details |
Inventors: Agar, Richard C.; Lora, Jairo H.; Cronlund, Malcolm; Wu, Chih Fae; Goyal, Gopal C.; Winner, Stephen R.; Raskin, Mikhail N.; Katzen, Raphael; LeBlanc, Ron;
Assignee:
Primary Examiner: Alvo; Steven
Assistant Examiner:
Attorney, Agent or Firm: Reed Smith Shaw & McClay LLP
This invention provides for the recovery of lignin and other by-products from the pulping of fibrous plant material. In accordance with this invention, solvents and filtrates are recovered and recycled for reuse. This results in significant solvent and energy savings. Filtrates from the bleaching and delignification of the pulp are recycled for reuse in pulping, separation, and recovery of lignin 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. The lignins are precipitated in high yields and at a high rate from a black liquor produced by pulping wood at high temperature and pressures. As a by-product of this process a purified furfural product is recovered. This furfural may be recycled for use in the recovery of the low molecular weight lignin of this process. |
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DETAILED DESCRIPTION This invention provides for the recovery of lignin and other by-products from pulping of fibrous material.
In accordance with this invention, solvents and filtrates are recovered and recycled for reuse.
This results in a significant solvent and energy savings.
In accordance with this invention, filtrates from the bleaching and delignification of the pulp of this invention are recycled for reuse in the continuous or batch pulping, separation and recovery of lignin and other by-products.
The reuse of the bleaching filtrates results in accelerated delignification and greater operating efficiency.
The net result is a significant energy savings and mitigation if not the elimination of pollution typically associated with bleaching.
In accordance with this invention, lignin is recovered from a black liquor comprising a solution of lignin, hemicellulose, and a water miscible organic solvent by precipitating lignin solids by diluting the black liquor with water and acid under conditions to form a diluted residual black liquor including a diluted residual black liquor supernatant and precipitated lignin solids which are free from the formation of tarry lignin precipitates and recovering the lignin by separating the lignin solids from the diluted residual black liquor supernatant.
In accordance with another aspect of this invention, a novel lignin is precipitated by the process of this invention.
A preferred lignin is characterized by: a number average molecular weight of about 700 to 1500 g/mol, a glass transition temperature of about 700 to 170.
degree.
C.
, a polydispersity of less than about 4 and a methoxyl content approximately equal to that of native lignin.
In accordance with another aspect of this invention, a novel low molecular weight lignin is obtained.
A preferred lignin is characterized by: a low average molecular weight in the range of less than 600 g/mol, a glass transition in the range of from about 24.
degree.
to 75.
degree.
C.
and a syringhaldehyde to vanillin molar ratio of about 2
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