Process for preparing propylene oxide
US-10435381-B2 · Oct 8, 2019 · US
Separation; Purification
Separation; Purification · 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 | C07D301/32 |
| Official title | Separation; Purification |
| Display label | Separation; Purification |
| Total patents | 137 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 16 |
| 2016 | 15 |
| 2017 | 13 |
| 2018 | 15 |
| 2019 | 18 |
| 2020 | 16 |
| 2021 | 12 |
| 2022 | 8 |
| 2023 | 9 |
| 2024 | 7 |
| 2025 | 6 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Processes and systems for removing an alkyl iodide impurity from a recycle gas stream in the production of ethylene oxide
US-2018370936-A1 · Dec 27, 2018 · US
Processes and systems for removing a vinyl iodide impurity from a recycle gas stream in the production of ethylene oxide
US-2018369752-A1 · Dec 27, 2018 · US
Processes and systems for removing iodide impurities from a recycle gas stream in the production of ethylene oxide
US-2018370935-A1 · Dec 27, 2018 · US
Guard bed system and process
US-2018369773-A1 · Dec 27, 2018 · US
Process and apparatus for recycling and refining propylene
US-10160700-B2 · Dec 25, 2018 · US
Process for the epoxidation of propene
US-2018346432-A1 · Dec 6, 2018 · US
Plasticizer compositions and methods for making plasticizer compositions
US-10077355-B2 · Sep 18, 2018 · US
Integrated process for making propene oxide and an alkyl tert-butyl ether
US-10053438-B2 · Aug 21, 2018 · US
Part-stream distillation
US-2018230117-A1 · Aug 16, 2018 · US
Waste stream upgrading in a propylene oxide/styrene coproduction process
US-2018221787-A1 · Aug 9, 2018 · US
Relating to ethylene oxide recovery
US-10035782-B2 · Jul 31, 2018 · US
Epoxidation process
US-2018044309-A1 · Feb 15, 2018 · US
Systems and methods related to the production of ethylene oxide, ethylene glycol, and/or ethanolamines
US-2018044308-A1 · Feb 15, 2018 · US
Purification of plasticizers
US-2018002301-A1 · Jan 4, 2018 · US
Integrated process for making propene oxide and an alkyl tert-butyl ether
US-2018002299-A1 · Jan 4, 2018 · US
Crystalline solids of a metAP-2 inhibitor and methods of making and using same
US-9827221-B2 · Nov 28, 2017 · US
Assembly for producing alkylene oxides and glycol ethers
US-9822087-B2 · Nov 21, 2017 · US
Relating to ethylene oxide recovery
US-2017298035-A1 · Oct 19, 2017 · US
Reflux condenser
US-2017239590-A1 · Aug 24, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07D301/32?
- CPC C07D301/32 is the Cooperative Patent Classification code for “Separation; Purification.”
- How many patents are filed under CPC C07D301/32 (Separation; Purification)?
- Our database includes 137 publications tagged with this CPC code.
- Is patent activity under CPC C07D301/32 growing?
- Publication counts under this code: 7 in 2024 vs 6 in 2025 (latest complete years).