A series of modified lignosulfonates containing aliphatic amide residues were prepared from kraft lignin (wood and straw) via a modification route, including Mannich Reaction with aliphatic polyamine,acylation by oleyl chloride and sulfomethylation. The interfacial tensions of the products were measured and the effects on the interfacial tension were discussed. The results indicate that the products have the excellent interfacial activity between the Shengli crude oil and the solutions of products, so that ...
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