Patents
US 8197645 B2: Process for separating propylene glycol from aqueous compositions
- Granted
- 2012-06-12
- Filed
- 2006-12-13 application 12159321
- Type
- Utility · 12 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
The present invention relates to a process for separating at least one propylene glycol from a mixture (M) comprising water and said propylene glycol, said process comprising (I) evaporating the mixture in at least two evaporation and/or distillation stages at decreasing operating pressures of the evaporators and/or distillation columns obtaining mixture (M′) and mixture (M″); (II) separating the mixture (M′) obtained in (I) in at least one further distillation step, obtaining a mixture (M-I) comprising at least 70 wt.-% of water and a mixture (M-II) comprising less than 30 wt.-% of water.
Source: PVGPATDIS, file of 2026-04-10 (ipg120612.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| BASF SE 6,481 patents | Foreign company or organization | Ludwigshafen, DE | PVGPATDIS, file of 2026-04-10 | |
| THE DOW CHEMICAL COMPANY 17 patents | US company or organization | Midland, MI | THE DOW CHEMICAL COMPANY Federal lobbying client EXACT high confidence: identical full name and state | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Armin Diefenbacher | Freisbach, DE | 5 | PVGPATDIS, file of 2026-04-10 | |
| Hans-Georg Goebbel | Kallstadt, DE | 6 | PVGPATDIS, file of 2026-04-10 | |
| Stefan Bitterlich | Dirmstein, DE | 10 | PVGPATDIS, file of 2026-04-10 | |
| Hartwig Voss | Bischofswerda, DE | 10 | PVGPATDIS, file of 2026-04-10 | |
| Henning Schultz | Mannheim, DE | 1 | PVGPATDIS, file of 2026-04-10 | |
| Anna Forlin | Vigonza, IT | 7 | PVGPATDIS, file of 2026-04-10 | |
| Renate Patrascu | Stade, DE | 3 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| B01D | Separation | B01D1/26 | PVGPATDIS, file of 2026-04-10 |
| C07C | Acyclic or carbocyclic compounds | C07C29/80 | PVGPATDIS, file of 2026-04-10 |
| Y10S | Technical subjects covered by former uspc cross-reference art collections [xracs] and digests | Y10S159/08 | 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 |
|---|---|---|---|---|---|
| 2008-07-03 | Correction Corrective assignment to correct the fourth inventor's name previously recorded on reel 021173 frame 0031. assignor(s) hereby confirms the assignment. | FORLIN, ANNA signed 2007-01-15 PATRASCU, RENATE signed 2007-01-24 DIEFENBACHER, ARMIN signed 2007-01-30 VOSS, HARTWIG signed 2007-02-01 BITTERLICH, STEFAN signed 2007-02-06 GOEBBEL, HANS-GEORG signed 2007-02-07 SCHULTZ, HENNING signed 2007-02-08 | BASF AKTIENGESELLSCHAFT LUDWIGSHAFEN THE DOW CHEMICAL COMPANY MIDLAND, MI | 21192/593 | ECORSEXC, file of 2026-09-25 |
| 2008-06-30 | Assignment Assignment of assignor's interest | FORLIN, ANNA signed 2007-01-15 PATRASCU, RENATE signed 2007-01-24 DIEFENBACHER, ARMIN signed 2007-01-30 VOSS, HARTWING signed 2007-02-01 BITTERLICH, STEFAN signed 2007-02-06 GOEBBEL, HANS-GEORG signed 2007-02-07 SCHULTZ, HENNING signed 2007-02-08 | BASF AKTIENGESELLSCHAFT LUDWIGSHAFEN THE DOW CHEMICAL COMPANY MIDLAND, MI | 21173/31 | 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.