Apparatus and process for separating a target product from a liquid phase comprising the target product
US-2015360142-A1 · Dec 17, 2015 · US
Method for producing (meth)acrylic acid
US10919834B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10919834-B2 |
| Application number | US-201816614450-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 22, 2018 |
| Priority date | May 25, 2017 |
| Publication date | Feb 16, 2021 |
| Grant date | Feb 16, 2021 |
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Abstract
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A method for producing (meth)acrylic acid comprising: a step of obtaining a (meth)acrylic acid-containing gas by subjecting a (meth)acrylic acid production raw material to a catalytic gas phase oxidation reaction; a step of obtaining a (meth)acrylic acid-containing liquid by bringing the (meth)acrylic acid-containing gas into contact with a collection solvent and/or condensing the (meth)acrylic acid-containing gas by cooling; a step of obtaining crude (meth)acrylic acid by introducing the (meth)acrylic acid-containing liquid into a low-boiling separation column; a step of obtaining purified (meth)acrylic acid and a refining residue containing a glyoxal compound by purifying the crude (meth)acrylic acid; and a step of returning at least a part of the refining residue to the low-boiling separation column; wherein a returning position of the refining residue to the low-boiling separation column is located closer to a bottom side of the low-boiling separation column than a supply port of the (meth)acrylic acid-containing liquid.
First claim
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The invention claimed is: 1. A method for producing (meth)acrylic acid, the method comprising: a step of obtaining a (meth)acrylic acid-containing gas by subjecting a (meth)acrylic acid production raw material to a catalytic gas phase oxidation reaction; a step of obtaining a (meth)acrylic acid-containing liquid by bringing the (meth)acrylic acid-containing gas into contact with a collection solvent and/or condensing the (meth)acrylic acid-containing gas by cooling; a step of obtaining crude (meth)acrylic acid by introducing the (meth)acrylic acid-containing liquid into a low-boiling separation column; a step of obtaining purified (meth)acrylic acid and a refining residue containing a glyoxal compound by purifying the crude (meth)acrylic acid; and a step of returning at least a part of the refining residue to the low-boiling separation column; wherein the returning position of the refining residue to the low-boiling separation column is located closer to the bottom side of the low-boiling separation column than the supply port of the (meth)acrylic acid-containing liquid. 2. The method for producing (meth)acrylic acid according to claim 1 , wherein the crude (meth)acrylic acid is introduced into a crystallizer and purified, and the refining residue is obtained as a crystallizing residue. 3. The method for producing (meth)acrylic acid according to claim 1 , wherein the crude (meth)acrylic acid is withdrawn from an outlet port at a position that is intermediate of the top side and the bottom side of the low-boiling separation column, and the returning position of the refining residue to the low-boiling separation column is located closer to the bottom side of the low-boiling separation column than the outlet port. 4. The method for producing (meth)acrylic acid according to claim 1 , wherein the returning position of the refining residue to the low-boiling separation column is located at a bottom part of the low-boiling separation column. 5. The method for producing (meth)acrylic acid according to claim 1 , wherein the crude (meth)acrylic acid is withdrawn from an outlet port at a position that is intermediate of the top side and the bottom side of the low-boiling separation column, and a bottom liquid is withdrawn from the bottom part of the low-boiling separation column and introduced into a high-boiling separation column. 6. The method for producing (meth)acrylic acid according to claim 5 , wherein a bottom liquid is withdrawn from a bottom part of the high-boiling separation column and introduced into a (meth)acrylic acid dimmer decomposition apparatus.
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- What does patent US10919834B2 cover?
- A method for producing (meth)acrylic acid comprising: a step of obtaining a (meth)acrylic acid-containing gas by subjecting a (meth)acrylic acid production raw material to a catalytic gas phase oxidation reaction; a step of obtaining a (meth)acrylic acid-containing liquid by bringing the (meth)acrylic acid-containing gas into contact with a collection solvent and/or condensing the (meth)acrylic…
- Who is the assignee on this patent?
- Nippon Catalytic Chem Ind
- What technology area does this patent fall under?
- Primary CPC classification C07C51/43. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 16 2021 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).