Tannin based polymeric coagulants composition and method of use
US7998351B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Dec 22, 2006 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Apr 18, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/547
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Composition and method of use for tannin based environmentally benign polymeric coagulants are disclosed. Tannin based coagulants are copolymers of naturally occurring tannins and a cationic monomer. One embodiment of the present invention provides for a composition, of a tannin based polymeric coagulant which is comprised of N,N-(dimethylaminoethyl) methacrylate (MADAME) polymerized using t-butylhydroperoxide and sodium metabisulfite. The resulting polyMADAME is converted to hydrochloride and then blended/reacted in an aqueous medium with tannin to obtain a homogenous poly(MADAME)-tannin composition. The method of use comprises adding an amount of the composition effective for the purpose of clarifying oily wastewater from food and beverage, steel, automotive, transportation, refinery, pharmaceutical, metals, paper and pulp, chemical processing and hydrocarbon processing industries.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.