Selective dimethylether and methanol recovery and recycle in a methanol-to-olefin process
US7132580B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 2003 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Jan 19, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P30/40
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved methanol-to-olefin (MTO) product recovery scheme is provided which enables substantial reduction in the amount of light olefins that are undesirably captured in a dimethylether (DME) recycle stream and improved recovery of methanol when a portion of the methanolic feed to the MTO reaction zone is used as the scrubbing solvent in a primary DME absorption zone in order to recycle this DME oxygenate by-product to the MTO reaction zone. In accordance with the present invention, a liquid solvent stream recovered from the primary DME absorption zone is subjected in a stripping zone to light olefin stripping conditions sufficient to lift a substantial portion of the light olefins that are absorbed in the DME solvent without stripping a significant portion of this methanol solvent, thereby increasing the recovery of desired light olefins while simultaneously diminishing the amount of light olefins carried by the DME recycle stream back to MTO conversion step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.