Removal of impurities from n-methyl-pyrrolidone using highly pure water washed activated alumina
US4837338A · kind A · utility
4Cited by
22References
9Claims
0Family size
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Key dates
| Filing date | Jun 16, 1986 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Jun 16, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G21/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
N-methyl pyrrolidone solvent (hereinafter NMP) used to extract aromatic components from lubricating oil distillates is purified by contacting the solvent with activated alumina.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.