Process for preparing unsaturated esters proceeding from aldehydes by direct oxidative esterification
US-9617199-B2 · Apr 11, 2017 · US
Method for production of methyl methacrylate by oxidative esterification using a heterogeneous catalyst
US10829435B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10829435-B2 |
| Application number | US-201816632560-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; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein pH at the reactor outlet is from 3 to 6.7.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and gold, wherein pH at the reactor outlet is from 3 to 6.7, wherein the average diameter of particles of the heterogeneous catalyst is at least 300 microns and at least 90 wt % of the gold is in the outer 70% of catalyst volume. 2. The method of claim 1 in which at least 90 wt % of the gold is in the outer 60% of catalyst volume. 3. The method of claim 2 in which average diameter of particles of the heterogeneous catalyst is at least 400 microns. 4. The method of claim 3 in which the amount of gold as a percentage of the gold and the support is from 0.2 to 5 wt %. 5. The method of claim 4 in which temperature in the reactor is from 40 to 120° C. 6. The method of claim 5 in which at least 95 wt % of the gold is in the outer 50% of catalyst volume. 7. The method of claim 6 in which pH in the reactor is from 4.5 to 6.5. 8. The method of claim 1 in which the support is titania. 9. The method of claim 8 in which at least 90 wt % of the gold is in the outer 60% of catalyst volume. 10. The method of claim 9 in which average diameter of particles of the heterogeneous catalyst is at least 400 microns.
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Classifications
of particles · CPC title
the coating containing organic compounds · CPC title
Titanium; Oxides or hydroxides thereof · CPC title
Alumina · CPC title
Egg shell like · CPC title
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- What does patent US10829435B2 cover?
- A method for preparing methyl methacrylate from methacrolein and methanol; said method comprising contacting in a reactor a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal, wherein pH at the reactor outlet is from 3 to 6.7.
- Who is the assignee on this patent?
- Dow Global Technologies Llc, Rohm & Haas
- What technology area does this patent fall under?
- Primary CPC classification C07C67/44. 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).