Isolation of acrylic acid by means of a distillation column having a side offtake
US9156768B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2011 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Sep 23, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S203/21
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present process separates acrylic acid from a composition containing acrylic acid and at least one accompanying product. The process first involves contacting the composition with an aqueous liquid stream to give a liquid solution of acrylic acid, accompanying product, and water. The water then forms an azeotrope with an entrainer, which is added to the solution. Distillation then separates the solution into an overhead product containing the azeotrope and a bottom product containing acrylic acid and accompanying product. The overhead product is separated into water and entrainer and the bottom product is separated in a distillation column into acrylic acid and accompanying product. The process provides a way to remove high- and low-boiling products with a small number of distillation columns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.