Purification of isoprene from renewable resources

Patent metadata

Field	Value
Publication number	US-9751820-B2
Application number	US-201514682930-A
Country	US
Kind code	B2
Filing date	Apr 9, 2015
Priority date	Dec 18, 2009
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

Methods and apparatus for the purification of isoprene, such as the purification of a bioisoprene composition from fermentor off-gas. The apparatus includes two columns that process the fermentor off-gas, which includes isoprene and various impurities. A solvent is added to the off-gas in the first column, and the isoprene is stripped from the solvent in the second column. Also provided is a downstream further purification process. Also provided are the resulting purified isoprene compositions.

First claim

What is claimed is:

1. A composition comprising isoprene and a bio-byproduct impurity, wherein the bio-byproduct impurity comprises C5 hydrocarbons, and wherein there is greater than about 99.94% isoprene (w/w) relative to the weight of the C5 hydrocarbons, and less than about 0.05% of the bio-byproduct (w/w) relative to the weight of the isoprene,
wherein the bio-byproduct impurity comprises one or more compounds selected from the group consisting of: 2-heptanone, 6-methyl-5-hepten-2-one, 2,4,5-trimethylpyridine, 2,3,5-trimethylpyrazine, citronellal, acetaldehyde, methanethiol, methyl acetate, 1-propanol, diacetyl, 2-butanone, 2-methyl-3-buten-2-ol, ethyl acetate, 2-methyl-1-propanol, 3-methyl-1-butanal, 3-methyl-2-butanone, 1-butanol, 2-pentanone, 3-methyl-1-butanol, ethyl isobutyrate, 3-methyl-2-butenal, butyl acetate, 3-methylbutyl acetate, 3-methyl-3-but-1-enyl acetate, 3-methyl-2-but-1-enyl acetate, (E)-3,7-dimethyl-1,3,6-octatriene, (Z)-3,7-dimethyl-1,3,6-octatriene, (E,E)-3,7,11-trimethyl-1,3,6,10-dodecatetraene and (E)-7,11-dimethyl-3-methylene-1,6,10-dodecatriene.

2. The composition of claim 1 , wherein the composition further comprises greater than about 95% isoprene relative to the weight of the composition.

3. The composition of claim 1 , further comprising:
a solvent.

Assignees

• Danisco Us Inc
• Goodyear Tire & Rubber

Inventors

• Feher Frank J
• Kan John Kaluen
• Mcauliffe Joseph C
• Mccall Thomas F
• Pickert Lawrence J
• Ploetz Christopher D
• Rodewald Stephan
• Sabo Timothy A
• Wong Tang H

Classifications

• C07C7/10

  by extraction, i.e. purification or separation of liquid hydrocarbons with the aid of liquids · CPC title

• B01D11/0426

  Counter-current multistage extraction towers in a vertical or sloping position · CPC title

• C07C7/04

  by distillation · CPC title

• B01D11/0492

  Applications, solvents used · CPC title

• C07C11/18 Primary

  Isoprene · CPC title