D21C 11/0078
Treatment of green or white liquors with other means or other compounds
Official title: {Treatment of green or white liquors with other means or other compounds than gases, e.g. in order to separate solid compounds such as sodium chloride and carbonate from these liquors; Further treatment of these compounds (fractionating of spent liquors D21C11/0042)}
D21C11/0078 (Treatment of green or white liquors with other means or other compounds) appears on 67 US grants and 51 published applications in this corpus.
Search patents in D21C- Granted patents
- 67
- Published applications
- 51
- Assignees
- 39
- Inventors
- 130
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 1 |
| 2002 | 2 | 4 |
| 2003 | 3 | 3 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 0 | 1 |
| 2007 | 2 | 1 |
| 2008 | 1 | 0 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 2 | 5 |
| 2015 | 3 | 2 |
| 2016 | 1 | 2 |
| 2017 | 2 | 3 |
| 2018 | 3 | 1 |
| 2019 | 1 | 1 |
| 2020 | 1 | 3 |
| 2021 | 2 | 3 |
| 2022 | 1 | 4 |
| 2023 | 3 | 2 |
| 2024 | 4 | 2 |
| 2025 | 1 | 2 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Predictive and real time process intervention involving a multi-component defoamer feed unit18 Aug 2026US 12,709,840 B2Buckman Laboratories International, Inc.
- Device and method for treating green liquor11 Aug 2026US 12,703,943 B2Valmet Corporation
- Recovering a caustic solution via calcium carbonate crystal aggregates24 Mar 2026US 12,583,756 B2Carbon Engineering ULC
- Method of replacing sodium losses in a pulp mill, a method of producing bleached cellulosic pulp, and a system17 Jun 2025US 12,331,460 B2Metsa Fibre Oy
- Method and a system for producing an oil rich fraction from biomass22 Oct 2024US 12,123,137 B2Valmet Technologies Oy
- Recovering a caustic solution via calcium carbonate crystal aggregates10 Sep 2026US 2026/0265074 A1Carbon Engineering ULC
- A method for removing non-process elements in a kraft pulping process9 Jul 2026US 2026/0193840 A1Valmet Corporation
- Predictive and real time process intervention involving a multi-component defoamer feed unit5 Jun 2025US 2025/0179733 A1Buckman Laboratories International, Inc.
- Recovering a caustic solution via calcium carbonate crystal aggregates2 Jan 2025US 2025/0002364 A1Carbon Engineering ULC
- Mixing assembly and method for controlling mixing of green liquor and a flocculation agent16 May 2024US 2024/0158989 A1Valmet Corporation
Most cited
By later US patents
- Process of producing kraft pulping liquor by the oxidation of white liquor in the presence of lime mud32US 5,082,526 APulp and Paper Research Institute of Canada · 1992
- Use of alkyleneamines for enhancing lime mud dewatering17US 6,312,560 B1Huntsman Ethyleneamines Ltd. · 2001
- Recovering a caustic solution via calcium carbonate crystal aggregates17US 9,637,393 B2Carbon Engineering Limited Partnership · 2017
- Method for clarifying green liquor13US 4,941,945 AHedemora AB · 1990
- Production of polysulphide by electrolysis of white liquor containing sulphide11US 5,624,545 AEka Nobel AB · 1997