PROCESS FOR THE PREPARATION OF CITRIC ACID EMPLOYING FILAMENTOUS FUNGI IN A CULTURE MEDIUM COMPRISING GLYCEROL
First Claim
1. A method for producing citric acid from glycerol with a yield of more than 70% w/w, which method comprises fermenting a filamentous fungus on a substrate which substrate comprises 10-90% w/w glycerol and 90-10% w/w of another carbon source, both expressed as glucose-equivalents on the total carbohydrate content of the substrate.
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Abstract
The present invention relates to a method for producing citric acid from glycerol with a yield of more than 70%. The method comprises fermenting a filamentous fungus on a substrate which comprises glycerol. The advantage of the method according to the invention is that a widely available substrate, i.e. glycerol, can be used and that yields may be obtained which are much higher than the yields obtained using state of the art methods for producing citric acid from glycerol. The glycerol is used in combination with one or more other carbon sources.
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Citations
12 Claims
- 1. A method for producing citric acid from glycerol with a yield of more than 70% w/w, which method comprises fermenting a filamentous fungus on a substrate which substrate comprises 10-90% w/w glycerol and 90-10% w/w of another carbon source, both expressed as glucose-equivalents on the total carbohydrate content of the substrate.
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12. A process for purifying crude glycerol, which process comprises mixing crude glycerol with CaO in a final concentration of at least 2.0 g CaO per kg of the mixture, followed by filtering the reaction mixture over a pressure filter to obtain purified glycerol.
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