Lignin having sulfur and phosphorus groups

Details Lignin having sulfur and phosphorus groups Lignin having sulfur and phosphorus groups

C - Chemistry, Metallurgy

07

G

260/133, 53/374

C07G 1/00 (2006.01) C22B 59/00 (2006.01) C22B 60/00 (2006.01)

Patent

CA 1288765

ABSTRACT LIGNIN HAVING SULFUR AND PHOSPHORUS GROUPS A product comprising lignin material having a sulfur content greater than 5%, a phosphorus content greater than 3%, and wherein the mole ratios sulfur to aromatic unit S/Ar>0.4, and phosphorus to aromatic unit P/Ar:>0.3, and wherein Ar in said mole ratio is arbitrary set to define a mole of an aryl propane unit having an average molecular weight of 242. On IR analysis the product has infra-red absorption bands for the aromatic groups, P=S groups, CH2-S groups, P-O-C groups, P-O-Ar groups. The product may be used for instance in chelation, as flame retardant, for agricultural and other end uses. The invention is also directed at a method of making the above product which comprises reacting a lignin containing material with phosphorus pentasulfide (P4S10): for example by reacting in a solvent or melting.

553716

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