Process for preparing vinyl acetate with inhibited by-product formation
US-2016311752-A1 · Oct 27, 2016 · US
Nitroxide hydroxylamine and phenylenediamine combinations as polymerization inhibitors for ethylenically unsaturated monomer processes
US10696618B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10696618-B2 |
| Application number | US-201916389424-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 19, 2019 |
| Priority date | Dec 3, 2013 |
| Publication date | Jun 30, 2020 |
| Grant date | Jun 30, 2020 |
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- Title
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Abstract
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Polymerization inhibitor compositions are provided. The polymerization inhibitor compositions may include at least one hydroxylamine of a nitroxide and at least one phenylenediamine. Methods of inhibiting the unwanted polymerization of monomers are also provided. The methods include adding the presently disclosed polymerization inhibitor compositions to a fluid containing the monomers. The monomers may be ethylenically unsaturated monomers, such as acrylic acid, methacrylic acid, acrylonitrile, methacrylonitrile, acrolein, methacrolein, acrylate, methacrylate, acrylamide, methacrylamide, vinyl acetate, butadiene, ethylene, propylene, and styrene.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of inhibiting polymerization of methacrylic acid, comprising: adding an effective amount of a polymerization inhibitor composition to a fluid comprising the methacrylic acid, wherein the polymerization inhibitor composition comprises an effective amount of 4-oxo-2,2,6,6-tetramethyl piperidinol and an effective amount of N-(dimethylbutyl)-N′-phenyl-p-phenylenediamine; and inhibiting polymerization of the methacrylic acid. 2. The method of claim 1 , wherein the effective amount of the 4-oxo-2,2,6,6-tetramethyl piperidinol and the effective amount of the N-(dimethylbutyl)-N′-phenyl-p-phenylenediamine is from about 1 ppm to about 2,000 ppm by weight of monomer. 3. The method of claim 1 , wherein the polymerization inhibitor composition is added continuously or intermittently to the fluid.
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Classifications
using retarding agents · CPC title
Oxygen atom, e.g. piperidine N-oxide · CPC title
Separation; Purification; Stabilisation; Use of additives · CPC title
Separation; Purification; Stabilisation; Use of additives (separation of optical isomers C07C231/20) · CPC title
Use of additives, e.g. for stabilisation · CPC title
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- What does patent US10696618B2 cover?
- Polymerization inhibitor compositions are provided. The polymerization inhibitor compositions may include at least one hydroxylamine of a nitroxide and at least one phenylenediamine. Methods of inhibiting the unwanted polymerization of monomers are also provided. The methods include adding the presently disclosed polymerization inhibitor compositions to a fluid containing the monomers. The mono…
- Who is the assignee on this patent?
- Ecolab Usa Inc
- What technology area does this patent fall under?
- Primary CPC classification C07C67/62. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 30 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).