Processes for producing acetic acid
US9409848B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2015 |
| Grant date | Aug 9, 2016 |
| Priority date | — |
| Expiry date | Sep 9, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/48
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Processes for the reduction and/or removal of permanganate reducing compounds (PRC'S) formed by the carbonylation of methanol in the presence of a Group VIII metal carbonylation catalyst to produce acetic acid are disclosed. More specifically, processes for reducing and/or removing PRC's or their precursors from intermediate streams during the formation of acetic acid by said carbonylation processes are disclosed. In particular, processes in which a low boiling overhead vapor stream from a light ends column is subjected to a distillation to obtain an overhead that is subjected to an extraction to selectively remove and/or reduce PRC's from the process is disclosed. The processes include steps of recycling one or more return streams derived from the distillation step and/or the extraction step to a light ends column and/or a drying column in order to improve water control in the overall reaction system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.