Extraction of carboxylic acids with tin compounds
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 5, 2014
Grant Date -
Nov 15, 2012
app pub date -
May 3, 2012
filing date -
May 10, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of removing a carboxylic acid from a liquid including a tertiary amide solvent includes: forming an extraction medium including an acid-extracting tin species and an extraction solvent that is immiscible with the tertiary amide solvent; subsequently contacting the liquid with the extraction medium, forming a phase including a de-acidified tertiary amide solvent and a phase including the extraction solvent; and removing the phase including the extraction solvent, to afford a liquid including the de-acidified tertiary amide solvent. The acid-extracting tin species is one or more tin species obtained by reaction of a di(hydrocarbyl) tin oxide with less than one equivalent of a carboxylic acid, or tin species obtainable by reaction of a 1,3-diacyloxy-1,1,3,3-tetra-(hydrocarbyl)distannoxane with an aqueous base. A method of preparing a sucralose-6-acylate includes uses the foregoing method to remove a carboxylic acid from a liquid including a tertiary amide solvent and the sucralose-6-acylate.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2012 Application Filing Year
- C07H Class
- 1452 Applications Filed
- 1128 Patents Issued To-Date
- 77.69 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C07H Class
- 0 % this patent is cited more than
- 11 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 5, 2026 |
