Removal of acetals from process streams
US-12577189-B2 · Mar 17, 2026 · US
by extractive distillation
by extractive 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 | C07C45/83 |
| Official title | by extractive distillation |
| Display label | by extractive distillation |
| Total patents | 48 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 3 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 6 |
| 2020 | 10 |
| 2021 | 6 |
| 2022 | 3 |
| 2023 | 5 |
| 2024 | 5 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process for production of propylene oxide and styrene monomer
US-2025243142-A1 · Jul 31, 2025 · US
Process for the hydroformylation of diisobutene with preceding distillation
US-2024417355-A1 · Dec 19, 2024 · US
Process for the purification of vanillin or a vanillin derivative obtained by a biotechnological process
US-2024140896-A1 · May 2, 2024 · US
Process for producing methacrylic acid or methacrylic acid esters
US-11905239-B2 · Feb 20, 2024 · US
Process for separating heavy by-products and catalyst ligan from a vapour stream comprising aldehyde
US-2024051908-A1 · Feb 15, 2024 · US
Process for producing methacrylic acid or methacrylic acid esters
US-11866387-B2 · Jan 9, 2024 · US
Process for preparing C5 aldehydes
US-11840506-B2 · Dec 12, 2023 · US
Process for preparing c5 aldehydes
US-2023357117-A1 · Nov 9, 2023 · US
Removal of acetals from process streams
US-2023202955-A1 · Jun 29, 2023 · US
Process for producing methacrylic acid or methacrylic acid esters
US-2023080750-A1 · Mar 16, 2023 · US
Methods for separation of azeotrope or azeotrope-like compositions of trifluoroiodomethane (CF3I) and trifluoroacetyl chloride (CF3COCI)
US-11565992-B2 · Jan 31, 2023 · US
Natural vanillin compositions
US-2022264922-A1 · Aug 25, 2022 · US
Methods for separation of azeotrope or azeotrope-like compositions of trifluoroiodomethane (cf3i) and trifluoroacetyl chloride (cf3coci)
US-2022153673-A1 · May 19, 2022 · US
Methods of chemical recovery for propylene oxide-styrene monomer processes
US-11247962-B2 · Feb 15, 2022 · 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
Process for producing methacrylic acid or methacrylic acid esters
US-2021317064-A1 · Oct 14, 2021 · US
Method for selectively separating impurities present in a hydro-alcoholic cut by recycling through a liquid-liquid extraction column
US-11141677-B2 · Oct 12, 2021 · US
Process for the recovery of ketones and glycols from fermentation
US-10988428-B2 · Apr 27, 2021 · US
Process for the separation of formaldehyde from crude acrylic acid
US-10968157-B2 · Apr 6, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07C45/83?
- CPC C07C45/83 is the Cooperative Patent Classification code for “by extractive distillation.”
- How many patents are filed under CPC C07C45/83 (by extractive distillation)?
- Our database includes 48 publications tagged with this CPC code.
- Is patent activity under CPC C07C45/83 growing?
- Publication counts under this code: 5 in 2024 vs 1 in 2025 (latest complete years).