# US 7,612,228 B2 · Synthetic method of glycol diesters from reaction of glycol monoesters and linear aliphatic carboxylic acids

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- Number: US 7,612,228 B2
- Document ID: US7612228B2
- Status: Granted
- Kind: B2
- Application number: 12/241,521
- Filed: 2008-09-30
- Published: 2009-01-22
- Granted: 2009-11-03
- Earliest claimed: 2005-08-23
- Assignees: LG Chem, Ltd.
- Inventors: Donghyun Ko; Kwang Ho Park; Sang Gi Lee; Jijoong Moon; Sungshik Eom; Dae Sun Rew
- Web page: https://patentgrep.com/patent/US7612228B2

## CPC

- C07C 67/08: by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
- Y02P 20/10: Process efficiency
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A method of synthesizing glycol diester by reacting a linear aliphatic carboxylic acid and a glycol monoester in the presence of a Lewis acid type catalyst is provided. In the method, after introducing the glycol monoester, the linear aliphatic carboxylic acid and the Lewis acid type catalyst into a reactor, the reaction occurs to produce reaction products and water in the reactor; an excess of the linear aliphatic carboxylic acid forms an azeotrope with water during the reaction to be sent to a condenser through a distillation column; the linear aliphatic carboxylic acid and water passed through the condenser are divided into an organic layer and an aqueous layer in an oil water separator; and the organic layer is returned to the distillation column through a material cycling line and water in the aqueous layer is removed through a water removal line. By utilizing reactive distillation technique, water produced during the reaction is rapidly removed, and thus the reaction time can be significantly reduced and the yield of the glycol diester can be maximized.

## Claims

### Claim 1

A glycol diester comprising 2,2,4-trimethyl-1,3-pentanediol mono-2-ethylhexanoate monobutyrate.