Patent ID: 8569562
Filing Date: 2013-10-29
Classification: B01D,C07C

Abstract:
1. A method of purifying isoprene from a fermentor off-gas comprising: contacting a fermentor off-gas, wherein the off-gas comprises a bioisoprene composition comprising isoprene, volatile impurity, and bio-byproduct impurity, with a solvent in a first column to form: an isoprene-rich solution comprising the solvent, a major portion of the isoprene and a major portion of the bio-byproduct impurity present in the off-gas; and a vapor comprising a portion of the volatile impurity present in the off-gas; transferring the isoprene-rich solution from the first column to a second column; and stripping isoprene from the isoprene-rich solution in the second column to form: an isoprene-lean solution comprising a portion of the bio-byproduct impurity present in the off-gas; and a purified isoprene composition.