Method for the indirect production of butanol and hexanol
First Claim
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1. A method to produce butanol and hexanol, comprising:
- (a) culturing a homoacetogenic microorganism in a fermentation medium comprising a carbohydrate source to produce acetate, acetic acid or mixtures thereof;
(b) chemically converting a portion of the acetate, acetic acid or mixtures thereof to ethanol;
(c) culturing an acidogenic microorganism in a fermentation medium comprising the ethanol and a portion of the acetate, acetic acid or mixtures thereof to produce a first intermediate selected from the group consisting of butyrate, butyric acid, and mixtures thereof, and a second intermediate selected from the group consisting of caproate, caproic acid, and mixtures thereof; and
(d) chemically converting the first intermediate into butanol and the second intermediate into hexanol.
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Abstract
A process for the conversion of carbohydrates from any of a number of sources into butanol and hexanol for fuel or chemical use is disclosed. The process includes conducting a homoacetogenic fermentation to produce an acetic acid intermediate which is chemically converted to ethanol. The ethanol and a remaining portion of the acetic acid intermediate are used as a substrate in an acidogenic fermentation to produce butyric and caproic acid intermediates which are then chemically converted to butanol and hexanol.
74 Citations
36 Claims
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1. A method to produce butanol and hexanol, comprising:
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(a) culturing a homoacetogenic microorganism in a fermentation medium comprising a carbohydrate source to produce acetate, acetic acid or mixtures thereof; (b) chemically converting a portion of the acetate, acetic acid or mixtures thereof to ethanol; (c) culturing an acidogenic microorganism in a fermentation medium comprising the ethanol and a portion of the acetate, acetic acid or mixtures thereof to produce a first intermediate selected from the group consisting of butyrate, butyric acid, and mixtures thereof, and a second intermediate selected from the group consisting of caproate, caproic acid, and mixtures thereof; and (d) chemically converting the first intermediate into butanol and the second intermediate into hexanol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method to produce butanol and hexanol, comprising:
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(a) culturing an acidogenic microorganism in a fermentation medium comprising ethanol and acetate, acetic acid or mixtures thereof to produce a first intermediate selected from the group consisting of butyrate, butyric acid, and mixtures thereof, and a second intermediate selected from the group consisting of caproate, caproic acid, and mixtures thereof; and (b) chemically converting the first intermediate into butanol and the second intermediate into hexanol.
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Specification