D21C 11/0071
Treatment of green or white liquors with gases
Official title: {Treatment of green or white liquors with gases, e.g. with carbon dioxide for carbonation; Expulsion of gaseous compounds, e.g. hydrogen sulfide, from these liquors by this treatment (stripping); Optional separation of solid compounds formed in the liquors by this treatment (oxidation of liquors (black, green or white) D21C11/0057; treatment of pulp gases D21C11/06)}
D21C11/0071 (Treatment of green or white liquors with gases) appears on 27 US grants and 16 published applications in this corpus.
Search patents in D21C- Granted patents
- 27
- Published applications
- 16
- Assignees
- 21
- Inventors
- 67
- Latest grant
- 22 Oct 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
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| 1989 | 1 | 0 |
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| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 0 | 1 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 2 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 1 |
| 2016 | 0 | 2 |
| 2017 | 0 | 0 |
| 2018 | 2 | 1 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 1 |
| 2024 | 1 | 1 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and a system for producing an oil rich fraction from biomass22 Oct 2024US 12,123,137 B2Valmet Technologies Oy
- Method and a system for adjusting PH of green liquor dregs23 May 2023US 11,655,589 B2Valmet Technologies Oy
- Method and apparatus for obtaining strong white liquor and lime mud with low residual alkali level3 Jul 2018US 10,011,947 B2Valmet Corporation
- Process for recausticizing green liquor3 Jul 2018US 10,011,948 B2Mondi AG
- Flash tank with compact steam discharge assembly1 Apr 2014US 8,685,205 B2Andritz Inc.
- A method for removing non-process elements in a kraft pulping process9 Jul 2026US 2026/0193840 A1Valmet Corporation
- Process to obtain fully oxidized white liquor for use in the fiberline of a kraft pulp process12 Sep 2024US 2024/0301622 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- A method and a system for producing an oil rich fraction from biomass27 Jul 2023US 2023/0235507 A1Valmet Technologies Oy
- A method and a system for adjusting ph of green liquor dregs1 Sep 2022US 2022/0275578 A1Valmet Technologies Oy
- Method for polysulfide production in a kraft pulp mill26 Apr 2018US 2018/0112355 A1Valmet Corporation
Most cited
By later US patents
- Methods for recovery and recycling of chemicals from sodium sulfite and sodium bisulfite pulping operations17US 4,148,684 AMEI Systems Inc. · 1979
- Method of oxidizing sulfide-containing liquor14US 4,855,123 AMitsubishi Paper Mills Limited · 1989
- Reactor mixing assembly14US 6,036,355 AQuantum Technologies, Inc. · 2000
- Multi-level sulfide content white liquor production and utilization in cellulose pulping9US 5,326,433 AAhlstrom Recovery Inc. · 1994
- Selective white liquor oxidation9US 5,382,322 AAir Products and Chemicals, Inc. · 1995