Method for carrying out a heterogeneously catalysed reaction
US-2019099731-A1 · Apr 4, 2019 · US
Method for production of methyl methacrylate by oxidative esterification using a heterogeneous catalyst
US10829432B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10829432-B2 |
| Application number | US-201816634408-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 25, 2018 |
| Priority date | Jul 28, 2017 |
| Publication date | Nov 10, 2020 |
| Grant date | Nov 10, 2020 |
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Abstract
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A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein said catalyst has an average diameter of at least 200 microns and at least 90 wt % of the noble metal is in the outer 70% of catalyst volume, and wherein oxygen concentration at a reactor outlet is from 0.5 to 7.5 mol %.
First claim
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The invention claimed is: 1. A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and gold, wherein said catalyst has an average diameter of at least 300 microns and at least 90 wt % of the gold is in the outer 70% of catalyst volume, and wherein oxygen concentration at a reactor outlet is from 0.5 to 7.5 mol %. 2. The method of claim 1 in which the catalyst has an average diameter from 400 microns to 10 mm. 3. The method of claim 2 in which the catalyst is contained in a catalyst bed. 4. The method of claim 3 in which the catalyst bed is at a temperature from 40 to 120° C. 5. The method of claim 4 in which pH in the catalyst bed is from 4 to 10. 6. The method of claim 5 in which at least 90 wt % of the gold is in the outer 50% of catalyst volume. 7. The method of claim 1 in which the support is selected from the group consisting of γ-, δ-, or θ-alumina. 8. The method of claim 7 in which methanol and methacrolein are fed to a reactor containing the catalyst bed in a molar ratio from 1:1 to 10:1, respectively. 9. The method of claim 8 in which at least 95 wt % of the gold is in the outer 40% of catalyst volume.
Assignees
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Classifications
Metal dispersion value, e.g. percentage or fraction · CPC title
characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title
Acrylic acid esters; Methacrylic acid esters · CPC title
- C07C67/39Primary
by oxidation of groups which are precursors for the acid moiety of the ester · CPC title
Gold · CPC title
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- What does patent US10829432B2 cover?
- A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein said catalyst has an average diameter of at least 200 microns and at least 90 wt % of the noble metal is in the outer 70% of catalyst volume, and wherein oxy…
- Who is the assignee on this patent?
- Dow Global Technologies Llc, Rohm & Haas
- What technology area does this patent fall under?
- Primary CPC classification C07C67/39. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 10 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 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).