C01B 17/94
Recovery from nitration acids
C01B17/94 (Recovery from nitration acids) appears on 11 US grants and 9 published applications in this corpus.
Search patents in C01B- Granted patents
- 11
- Published applications
- 9
- Assignees
- 13
- Inventors
- 41
- Latest grant
- 27 Dec 2016
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 1 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 2 |
| 2015 | 2 | 0 |
| 2016 | 1 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Process and device for recycling waste acid produced in process of producing zoalene27 Dec 2016US 9,527,801 B2Zhejiang Rongyao Biotech Co., Ltd.
- Method and system for producing nitrobenzene22 Sep 2015US 9,139,508 B2Bayer Intellectual Property GmbH
- Method and plant for reprocessing waste sulphuric acids from nitration processes18 Aug 2015US 9,108,847 B2DE Dietrich Process Systems
- Process for producing sulfuric acid with low levels of nitrogen oxides26 Aug 2014US 8,815,202 B2E. I. Du Pont de Nemours and Company
- Method and system for concentrating waste sulphuric acids from nitration processes2 Aug 2011US 7,988,942 B2DE Dietrich Process Systems
- Process for recycling nitrogen oxides from nitrosyl sulfuric acid to produce concentrated or highly concentrated nitric acid and sulfuric acid6 Jun 2024US 2024/0182302 A1Plinke GmbH
- Process for workup of mixed acid and wastewater from the nitration of aromatics and apparatus for performing the process6 Jan 2022US 2022/0002155 A1Plinke GmbH
- Process and Device for Recycling Waste Acid Produced in Process of Producing Zoalene30 Jun 2016US 2016/0185711 A1Zhejiang Rongyao Biotech Co., Ltd.
- Method and system for producing nitrobenzene4 Dec 2014US 2014/0357905 A1Bayer Intellectual Property GmbH
- Process for producing sulfuric acid with low levels of nitrogen oxides27 Feb 2014US 2014/0056802 A1E. I. Du Pont de Nemours and Company
Most cited
By later US patents
- Process for purification and concentration of sulfuric acid17US 5,275,701 AAir Products and Chemicals, Inc. · 1994
- No.sub.x destruction in sulphuric acid9US 5,955,050 AMarsulex Inc. · 1999
- Removal of nitric acid from nitric acid-sulfuric acid mixtures4US 4,155,989 ACiba-Geigy Corporation · 1979
- Method and system for concentrating waste sulphuric acids from nitration processes3US 7,988,942 B2DE Dietrich Process Systems · 2011
- Spent acid purification process2US 5,030,436 AEthyl Corporation · 1991