Continuous or semi-continuous process for the preparation of ethylene glycol and catalyst system for use therein
US11059768B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2019 |
| Grant date | Jul 13, 2021 |
| Priority date | — |
| Expiry date | Mar 14, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A continuous or semi-continuous process for the preparation of ethylene glycol from a carbohydrate source including:reacting, in a reactor, at a temperature in the range from equal to or more than 170° C. to equal to or less than 270° C., at least a portion of a carbohydrate source in the presence of hydrogen, a solvent, and a catalyst system, to yield ethylene glycol;wherein the catalyst system includes:a homogeneous catalyst, which homogeneous catalyst contains tungsten; anda heterogeneous catalyst, which heterogeneous catalyst contains one or more transition metals from groups 8, 9 and 10 of the Periodic Table of the Elements supported on a carrier; andwherein continuously or periodically additional heterogeneous catalyst is added to the reactor.Further described is a catalyst system that can be used in such a process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.