Solvent recovery process for N-methyl-2-pyrrolidone in hydrocarbon extraction
US4057491A · kind A · utility
22Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1976 |
| Grant date | Nov 8, 1977 |
| Priority date | — |
| Expiry date | Mar 26, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G21/28
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
N-methyl-2-pyrrolidone is recovered from the raffinate and extract phases produced by its use in hydrocarbon extraction processes, particularly lube oil extraction, through the use of flash evaporation and/or distillation followed by gas stripping. Water buildup in the recovered solvent is prevented by employing solvent dehydration means in the solvent recovery line after gas stripping. Proper control of process parameters enables the dehydration means to remove excess water without requiring additional heat input to the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.