IP Library › Granted Patent US 7,897,814
Granted Patent B2
US 7,897,814 · App. 12/159,318 · Granted Mar 1, 2011

Method for extracting methacrylic acid

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Quick Facts
Patent No.
US 7,897,814
App. No.
12/159,318
Granted
Mar 1, 2011
Kind
B2
Abstract

Disclosed is a method for extracting methacrylic acid, in which an extraction solvent is added to a methacrylic acid aqueous solution for transferring methacrylic acid to the extraction solvent. In this method, a solvent containing t-butyl methacrylate is used as the extraction solvent.

Claims (6)

1. A method for extracting methacrylic acid, comprising the steps of:

(a) adding an extraction solvent comprising t-butyl methacrylate to a methacrylic acid aqueous solution; and

(b) causing methacrylic acid to transfer to the extraction solvent.

2. The method for extracting methacrylic acid according to claim 1 , wherein the extraction solvent is a mixture of t-butyl methacrylate and methyl methacrylate.

3. The method for extracting methacrylic acid according to claim 1 , wherein the amount of the extraction solvent to be used is in the range of 0.5 to 15 times with respect to the total mass of the methacrylic acid aqueous solution.

4. The method for extracting methacrylic acid according to claim 2 , wherein a mass fraction of methyl methacrylate in the extraction solvent is in the range of 3 to 90%.

Assignments (2)
CHANGE OF NAME Recorded Sep 5, 2017
From: MITSUBISHI RAYON CO., LTD.
To: MITSUBISHI CHEMICAL CORPORATION
Reel/Frame 043750/0834 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 21, 2008
From: ENDOH, TOHRU; MATAKE, KAZUNORI; TANAKA, SHIGEHO; SATO, HARUKI
To: MITSUBISHI RAYON CO., LTD.
Reel/Frame 021714/0200 →