Method for production of purified (meth)acrylic acid
US8044238B2 · kind B2 · utility
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Key dates
| Filing date | Jun 1, 2009 |
| Grant date | Oct 25, 2011 |
| Priority date | — |
| Expiry date | Feb 27, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D3/36
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to reducing corrosion of distillation equipment during azeotropic distillation of (meth)acrylic acid in the presence of dissolved copper, by providing aqueous (meth)acrylic acid having not more than 0.1% by weight formaldehyde, based on the total weight of the aqueous (meth)acrylic acid. The source of the copper may, for example, be copper-based polymerization inhibitors added to the aqueous (meth)acrylic acid and/or distillation equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.