Purification of propylene glycol monoalkyl ether
US7439405B1 · kind B1 · utility
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9Claims
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Assignee
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Key dates
| Filing date | Jan 14, 2008 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Jan 14, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C41/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention is a method of purifying a propylene glycol monoalkyl ether containing carbonyl impurities which comprises contacting the propylene glycol monoalkyl ether stream in the liquid phase with a carbon adsorbent, and recovering a purified propylene glycol monoalkyl ether product. The purification method improves product quality and reduces the amount of carbonyl impurities in the propylene glycol monoalkyl ether.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.