# US 5,705,038 A · Separation of phellandrene from limonene by extractive distillation

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- Number: US 5,705,038 A
- Document ID: US5705038A
- Status: Granted
- Kind: A
- Application number: 08/755,640
- Filed: 1996-11-25
- Granted: 1998-01-06
- Earliest claimed: 1996-11-25
- Inventors: Lloyd Berg
- Web page: https://patentgrep.com/patent/US5705038A

## CPC

- C07C 7/08: by extractive distillation
- C07C 2601/16: the ring being unsaturated
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

Phellandrene is difficult to separate from limonene by conventional distillation or rectification because of the proximity of their boiling points. Phellandreneecan be readily separated from limonene by extractive distillation. Effective agents are o-cresol, tripropylene glycol and isophorone.

## Claims

### Claim 1

A method for recovering phellandrene from a mixture consisting of phellandrene and limonene which consists essentially of distilling said mixture consisting of phellandrene and limonene in the presence of an extractive distillation agent, recovering the phellandrene as overhead product and obtaining the limonene and the extractive distillation agent as bottoms product, wherein said extractive distillation agent consists of one material selected from the group consisting of o-cresol, methyl n-amyl ketoxime, N-methyl pyrrolidinone, tripropylene glycol, 2-methyl-2,4-pentanediol and isophorone.