Method of purifying hydroxyalkyl amide
US7312346B2 · kind B2 · utility
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5References
70Claims
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Key dates
| Filing date | Nov 12, 2003 |
| Grant date | Dec 25, 2007 |
| Priority date | — |
| Expiry date | Mar 3, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10L1/224
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for purifying hydroxyalkyl amide of residual alkanolamine by using nonpolar solvent, an acidic pH, salt solutions and an elevated temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.