Method for preparing acrylic acid
US-2025340504-A1 · Nov 6, 2025 · US
by azeotropic distillation
by azeotropic distillation · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C07C51/46 |
| Official title | by azeotropic distillation |
| Display label | by azeotropic distillation |
| Total patents | 63 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 14 |
| 2016 | 4 |
| 2017 | 4 |
| 2018 | 5 |
| 2019 | 8 |
| 2020 | 6 |
| 2021 | 4 |
| 2022 | 2 |
| 2023 | 5 |
| 2024 | 6 |
| 2025 | 4 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for preparing acrylic acid
US-2025091979-A1 · Mar 20, 2025 · US
Aldehyde removal process for methanol carbonylation
US-12162830-B2 · Dec 10, 2024 · US
Process for the recovery of monopotassium glucarate and glucaric acid
US-2024391861-A1 · Nov 28, 2024 · US
Method for purifying (meth)acrylic acid
US-12116339-B2 · Oct 15, 2024 · US
Methods for removal of sulfur dioxide (so2) from trifluoroacetyl chloride (tfac)
US-2024300884-A1 · Sep 12, 2024 · US
Method for recovering carboxylic acid
US-2024270674-A1 · Aug 15, 2024 · US
Process for producing acetic acid
US-RE50062-E · Jul 30, 2024 · US
Methods for synthesizing anhydrous lactic acid
US-2023348352-A1 · Nov 2, 2023 · US
Method for producing nucleic acid oligomer
US-2023242570-A1 · Aug 3, 2023 · US
Method for producing nucleic acid oligomer
US-2023167152-A1 · Jun 1, 2023 · US
Method for purifying (meth)acrylic acid
US-2023109749-A1 · Apr 13, 2023 · US
Azeotrope or azeotrope-like compositions of trifluoroiodomethane (CF3I) and trifluoroacetyl chloride (CF3COCI)
US-11555136-B2 · Jan 17, 2023 · US
Aldehyde removal process for methanol carbonylation
US-2022185760-A1 · Jun 16, 2022 · US
Acrylic acid purification via dividing wall columns
US-11214534-B2 · Jan 4, 2022 · US
Azeotrope or azeotrope-like compositions of trifluoroiodomethane (CF3I) and trifluoroacetyl chloride (CF3COCI)
US-11208582-B2 · Dec 28, 2021 · US
Purification of aqueous solutions containing formaldehyde and use of the purified solution in an acrylic acid production process
US-2021395107-A1 · Dec 23, 2021 · US
Separation of propionic acid from acrylic acid via azeotropic distillation
US-10968160-B2 · Apr 6, 2021 · US
Process for producing polymer-grade (meth)acrylic acid
US-10961179-B2 · Mar 30, 2021 · US
Acrylic acid purification via dividing wall columns
US-2020385329-A1 · Dec 10, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07C51/46?
- CPC C07C51/46 is the Cooperative Patent Classification code for “by azeotropic distillation.”
- How many patents are filed under CPC C07C51/46 (by azeotropic distillation)?
- Our database includes 63 publications tagged with this CPC code.
- Is patent activity under CPC C07C51/46 growing?
- Publication counts under this code: 6 in 2024 vs 4 in 2025 (latest complete years).