C07C 29/74
Separation
Official title: Separation; Purification; Use of additives, e.g. for stabilisation
C07C29/74 (Separation) appears on 1,868 US grants and 1,582 published applications in this corpus.
Search patents in C07C- Granted patents
- 1,868
- Published applications
- 1,582
- Assignees
- 807
- Inventors
- 4,042
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 13 | 0 |
| 1978 | 15 | 0 |
| 1979 | 14 | 0 |
| 1980 | 25 | 0 |
| 1981 | 42 | 0 |
| 1982 | 36 | 0 |
| 1983 | 37 | 0 |
| 1984 | 37 | 0 |
| 1985 | 26 | 0 |
| 1986 | 26 | 0 |
| 1987 | 39 | 0 |
| 1988 | 27 | 0 |
| 1989 | 23 | 0 |
| 1990 | 28 | 0 |
| 1991 | 33 | 0 |
| 1992 | 29 | 0 |
| 1993 | 26 | 0 |
| 1994 | 31 | 0 |
| 1995 | 39 | 0 |
| 1996 | 15 | 0 |
| 1997 | 15 | 0 |
| 1998 | 36 | 0 |
| 1999 | 32 | 0 |
| 2000 | 19 | 0 |
| 2001 | 25 | 3 |
| 2002 | 26 | 18 |
| 2003 | 24 | 29 |
| 2004 | 17 | 32 |
| 2005 | 14 | 22 |
| 2006 | 27 | 17 |
| 2007 | 19 | 24 |
| 2008 | 12 | 50 |
| 2009 | 20 | 37 |
| 2010 | 18 | 68 |
| 2011 | 34 | 79 |
| 2012 | 55 | 100 |
| 2013 | 76 | 112 |
| 2014 | 102 | 94 |
| 2015 | 112 | 92 |
| 2016 | 71 | 87 |
| 2017 | 51 | 74 |
| 2018 | 74 | 46 |
| 2019 | 58 | 63 |
| 2020 | 65 | 68 |
| 2021 | 49 | 61 |
| 2022 | 36 | 86 |
| 2023 | 53 | 95 |
| 2024 | 51 | 97 |
| 2025 | 57 | 68 |
| 2026 | 47 | 60 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Recovering mono-ethylene glycol8 Sep 2026US 12,729,173 B2Changchun Meihe Science and Technology Development Co., Ltd.
- Method for preparing bio-based 1,4-butanediol1 Sep 2026US 12,723,013 B2Zhejiang Boju New Materials Co., Ltd.
- Removal of sulfate from MEG streams using calcium chloride1 Sep 2026US 12,723,014 B2Cameron International Corporation
- Green methanol production25 Aug 2026US 12,715,827 B2ZoneFlow Reactor Technologies, LLC
- Systems and methods for a refinement processing of xylitol fermentation broth4 Aug 2026US 12,698,249 B2Zhejiang Huakang Pharmaceutical Co., Ltd.
- Process for the preparation of polyisobutene from olefins from isobutanol obtained from mixed guerbet reaction of ethanol and methanol8 Oct 2026US 2026/0308287 A1BASF SE
- Process for the recovery of low-boiling point components from an ethanol stream1 Oct 2026US 2026/0297630 A1Braskem S/A
- Process for the recovery of low-boiling point components from an ethanol stream1 Oct 2026US 2026/0297631 A1Braskem S/A
- A method for storing hydrogen in a reactor or a synthesis loop24 Sep 2026US 2026/0285677 A1Topsoe A/S
- Process for producing pure methanol from a carbon dioxide-rich synthesis gas with single column purification24 Sep 2026US 2026/0285788 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
Most cited
By later US patents
- Separation of 1-pentanol from cyclopentanol by extractive distillation258US 5,320,715 A1994
- Process for the preparation of ethanol161US 4,395,576 AShell Oil Company · 1983
- Continuous production of ethanol and plural stage distillation of the same157US 4,454,358 ABASF SE · 1984
- Alcohol distillation process154US 3,990,952 ARaphael Katzen Associates International, Inc. · 1976
- Low energy extractive distillation process for producing anhydrous ethanol152US 5,035,776 AUniversity of Massachusetts · 1991