# US 9,040,740 B2 · Method for preparing alkyl lactate and a method for preparing lactamide using the same

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- Number: US 9,040,740 B2
- Document ID: US9040740B2
- Status: Granted
- Kind: B2
- Application number: 13/642,760
- Filed: 2011-05-17
- Published: 2013-03-28
- Granted: 2015-05-26
- Earliest claimed: 2010-05-18
- Assignees: LG Chem, Ltd.
- Applicants: Sung-Cheol Yoon; Seung-Young Park; In-Su Lee
- Inventors: Sung-Cheol Yoon; Seung-Young Park; In-Su Lee
- Web page: https://patentgrep.com/patent/US9040740B2

## CPC

- C07C 67/40: by oxidation of primary alcohols
- C07C 231/02: from carboxylic acids or from esters, anhydrides, or halides thereof by reaction with ammonia or amines
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

This disclosure relates to a method for preparing alkyl lactate with high yield and high selectivity, comprising the step of reacting glycerol with water or alcohol in the presence of a catalyst. In addition, the present invention provides a method for efficiently preparing lactamide using the alkyl lactate.

## Claims

### Claim 1

A method for preparing lactate compound of the following Chemical Formula 1, comprising the step of reacting glycerol with alcohol of the following Chemical Formula 2 in the presence of a catalyst,
wherein the catalyst is a homogeneous or heterogeneous catalyst,
wherein the homogeneous catalyst is at least one selected from the group consisting of an alkali metal compound having a hydroxyl or alkoxy group, a bicarbonate (HCO3−)-containing metal compound, and a carbonate (CO32−)-containing metal compound, and
wherein the heterogeneous catalyst is a metal compound containing Mg, Ca, Zr, Sn or Ti:
wherein, R1 is a substituted or unsubstituted C1-10 alkyl, a substituted or unsubstituted C3-10 cycloalkyl, a substituted or unsubstituted C6-10 aryl, a substituted or unsubstituted C3-10 alkylene, a substituted or unsubstituted C3-10 cycloalkylene, or a substituted or unsubstituted C6-10 arylene.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the alkali metal compound having a hydroxyl group is NaOH, KOH, LiOH or Ba(OH)2, and
the alkali metal compound having an alkoxy group is NaOR, KOR or LiOR (wherein, R is a substituted or unsubstituted C1-10 alkyl group).

### Claim 3 (depends on 1)

The method according to claim 1, wherein the heterogeneous catalyst further comprises at least one selected from the group consisting of an alkali metal compound, a hydroxyl group-containing metal compound, a bicarbonate-containing metal compound, a carbonate-containing metal compound, activated clay, zeolite, active carbon, diatomaceous earth, bentonite, alumina, silicalite, fly ashes, molecular sieve, vermiculite, perlite, π-complex compound adsorbent, clay and polymer resin.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the reaction is conducted in a batch reactor or tubular reactor.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the reaction is conducted at a temperature of 100 to 300° C. and a pressure of 10 to 200 atm for 1 to 20 hours, under inert atmosphere.

### Claim 6 (depends on 1)

The method according to claim 1, wherein R1 in the alcohol of the Chemical Formula 2 is methyl or ethyl.