Methods for separating the binary azeotropic mixture of ethylene glycol and ethylene glycol diacetate with sulfolane entrainer
US12428367B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2025 |
| Grant date | Sep 30, 2025 |
| Priority date | — |
| Expiry date | Jan 15, 2045 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Method for separating ethylene glycol (EG) and ethylene glycol diacetate (EGDA) with sulfolane entrainer, including: obtaining EG and a mixture of EGDA and sulfolane through separating a mixture of EG and EGDA under an action of sulfolane by an extractive distillation tower; obtaining EGDA and sulfolane through separating the mixture of the EGDA and the sulfolane by an entrainer recovery tower; and obtaining recycled sulfolane through cooling the sulfolane by a heat exchanger, and mixing the recycled sulfolane with fresh sulfolane and circulating into the extractive distillation tower for recycling. Through the method, a yield of the EG is greater than or equal to 99.50% and a mass purity of the EG is greater than or equal to 99.50%, and a yield of the EGDA is greater than or equal to 99.80% and a mass purity of the EGDA is greater than or equal to 99.90%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.