Synthesis method of N-substituted maleimide using solid acid catalysts
US-10487052-B2 · Nov 26, 2019 · US
Production method of maleimide
US10836719B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10836719-B2 |
| Application number | US-201916399208-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 30, 2019 |
| Priority date | May 10, 2018 |
| Publication date | Nov 17, 2020 |
| Grant date | Nov 17, 2020 |
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Abstract
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An object is to provide a method for easily producing maleimide (MI) in which trace amounts of residual acid components as impurities in a crude MI are efficiently reduced, that is, the acid value is sufficiently reduced. <1> A method for producing purified MI, comprising reducing an acid value of crude MI by 50% or more, by adding carbodiimide (CDI) to a solution comprising the crude MI to react an acid component in the crude MI with the CDI. <2> The method for producing purified MI, comprising adding 0.5% by mass or more and 8% by mass or less of the CDI with respect to a mass of the crude MI for reaction. <3> The method for producing purified MI, wherein the CDI is N,N′-diisopropyl carbodiimide (DIC). <4> The method for producing purified MI, comprising removing a urea derivative of the CDI (CDI-U) by-produced when reacting the acid component in the crude MI with the CDI.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing purified maleimide (MI), comprising reducing an acid value of crude MI by 50% or more, by adding carbodiimide (CDI) to a solution comprising the crude MI containing an acid component to react the acid component in the crude MI with the CDI. 2. The method for producing purified MI of claim 1 , comprising adding 0.5% by mass or more and 8% by mass or less of the CDI with respect to a mass of the crude MI for reaction. 3. The method for producing purified MI of claim 1 , wherein the CDI is N,N′-diisopropyl carbodiimide (DIC). 4. The method for producing purified MI of claim 1 , comprising removing a urea derivative of the CDI (CDI-U) by-produced when reacting the acid component in the crude MI with the CDI. 5. The method for producing purified MI of claim 4 , wherein a method for removing the CDI-U is a reprecipitation method or a solvent extraction method. 6. The method for producing purified MI of claim 5 , wherein a solvent used for the reprecipitation method or the solvent extraction method is methanol. 7. The method for producing purified MI of claim 2 , wherein the CDI is N,N′-diisopropyl carbodiimide (DIC). 8. The method for producing purified MI of claim 2 , comprising removing a urea derivative of the CDI (CDI-U) by-produced when reacting the acid component in the crude MI with the CDI.
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Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof · CPC title
- C07D207/448Primary
with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms, e.g. maleimide · CPC title
Use of anti-solvent · CPC title
Carbodiimides · CPC title
Applications, solvents used · CPC title
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- What does patent US10836719B2 cover?
- An object is to provide a method for easily producing maleimide (MI) in which trace amounts of residual acid components as impurities in a crude MI are efficiently reduced, that is, the acid value is sufficiently reduced. <1> A method for producing purified MI, comprising reducing an acid value of crude MI by 50% or more, by adding carbodiimide (CDI) to a solution comprising the crude …
- Who is the assignee on this patent?
- Unitika Ltd
- What technology area does this patent fall under?
- Primary CPC classification C07D207/448. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 17 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).