Method for polymerization of lignin

Details Method for polymerization of lignin Method for polymerization of lignin

1978-08-14

1980-09-09

Phillips, Delbert R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07G 100

Patent

active

042217083

ABSTRACT:
Disclosed herein is a process for polymerizing technical lignins, hardwood as well as softwood and sulfonated as well as unsulfonated. The process involves the sequential treatment of the lignin material with formaldehyde and air (or oxygen) to increase the molecular weight. The lignin is first treated with from 0.5 to 3.5 moles of formaldehyde per 1,000 grams of lignin at a pH between 10.5 and 11.5 and a temperature from 50.degree. C. to 80.degree. C. for from 3 to 24 hours to form a lignin-formaldehyde adduct, preferably with minimum cross-linking of the lignin. Then, the thus formed lignin-formaldehyde adduct is oxidized at a temperature of from 25.degree. C. to 80.degree. C. with air or molecular oxygen for from 2 to 24 hours.

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patent: 3864276 (1975-02-01), Benko et al.
patent: 3886101 (1975-05-01), Felicetta et al.
patent: 4045421 (1977-08-01), Wenzel et al.
patent: 4069217 (1978-01-01), Detroit et al.
Chem. Abst., 88, 1978, p. 92017d.

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