IP Library › Granted Patent US 7,705,167
Granted Patent B2
US 7,705,167 · App. 10/571,472 · Granted Apr 27, 2010

Process for purifying propylene oxide

Assignee: Sumitomo Chemical Company, Limited
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Quick Facts
Patent No.
US 7,705,167
App. No.
10/571,472
Granted
Apr 27, 2010
Kind
B2
Abstract

A process for purifying propylene oxide, which comprises washing propylene oxide containing aldehydes and subsequently contacting an aqueous phase obtained with an extractant.

Claims (4)

1. A process for purifying propylene oxide, which comprises:

washing propylene oxide containing aldehydes with water; and

subsequently contacting an aqueous phase obtained with an extractant, wherein the extractant is a hydrocarbon having 3 to 10 carbon atoms.

2. The process according to claim 1 , the process further comprising separating propylene oxide by distillation from the extractant obtained after contacting the aqueous phase with the extractant.

Assignments (3)
RELEASE OF SECURITY INTEREST Recorded Feb 11, 2008
From: CITICORP NORTH AMERICA, INC.
To: NOVELIS CORPORATION; NOVELIS INC.
Reel/Frame 020487/0294 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 13, 2006
From: SHINOHARA, KOJI; NAKAYAMA, TOSHIO
To: SUMITOMO CHEMICAL COMPANY, LIMITED
Reel/Frame 017690/0653 →
SECURITY INTEREST Recorded Mar 3, 2005
From: NOVELIS CORPORATION; NOVELIS INC.
To: CITICORP NORTH AMERICA, INC.
Reel/Frame 016369/0282 →
Priority Claims (1)
JP 2003-325741 · Sep 18, 2003 · national
Continuity (1)
Related Publication 20070032671A1 · Feb 8, 2007