| abstract |
The invention is a process for preparing alkylated tannin Mannich polymers by reacting a tannin Mannich condensation polymer, prepared from a condensed tannin, and amine, and formaldehyde, with an alkylating agent at a pH between 5 and 14. Optionally, the alkylated tannin Mannich polymer may be reacted further with formaldehyde to increase its viscosity. The invention further comprises a method of removing color form waste water utilizing the alkylated tannin Mannich polymer produced by the above process. |