Patents
US 9193660 B2: Process for recovery of a carboxylic acid from a feed stream containing the corresponding ester
- Granted
- 2015-11-24
- Filed
- 2013-06-20 application 13986969
- Type
- Utility · 4 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
A carboxylic acid e.g. acetic acid, is recovered from an aqueous feed stream containing the corresponding ester, an alcohol and a small amount of water by catalytically dehydrating the alcohol to the corresponding ether and water, and reacting the water with the ester to generate a liquid carboxylic acid rich product stream. The acid is recovered by distillation. In a second embodiment, additional alcohol and/or water are co-fed with the feed or fed directly to a catalytic distillation column, resulting in a liquid bottom product stream of substantially pure acetic acid and a top distillate stream of substantially pure ether.
Source: PVGPATDIS, file of 2026-04-10 (ipg151124.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| AMT International Inc. 26 patents | US company or organization | Plano, TX | AMT INTERNATIONAL, INC. State business registration EXACT high confidence: identical full name and state | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Kuang-Yeu Wu | Plano, TX | 22 | PVGPATDIS, file of 2026-04-10 | |
| Pai-Yu Polly Chiang | Dallas, TX | 2 | PVGPATDIS, file of 2026-04-10 | |
| Ji-Young Jang | McKinney, TX | 10 | PVGPATDIS, file of 2026-04-10 | |
| Karl T. Chuang | Fairfield, CA | 19 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| C07C | Acyclic or carbocyclic compounds | C07C51/42 | PVGPATDIS, file of 2026-04-10 |
| B01D | Separation | B01D3/009 | PVGPATDIS, file of 2026-04-10 |
| Y02P | Climate change mitigation technologies in the production or processing of goods | Y02P20/10 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2013-06-20 | Assignment Assignment of assignor's interest | CHIANG, PAI-YU POLLY signed 2011-02-10 JANG, JI-YOUNG signed 2011-02-10 WU, KUANG-YEU signed 2011-02-10 CHUANG, KARL TZE-TANG signed 2011-02-15 | AMT INTERNATIONAL INC. PLANO, TX | 30725/258 | ECORSEXC, file of 2026-09-25 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.