Abstract

Both yeast and bacteria fermentations show specific advantages. Yeast fermentation is easier to operate and, therefore, operational availability of these plants is very high. Bacteria fermentation is superior in the yield on the carbon source, the most important factor for the product price. A process is proposed which combines the advantages of yeast and bacterial fermentations. Its main features are: yeast fermentation using methanol as the carbon source, gassing of the fermenters with pure oxygen, recycle of the fermentation off-gas which consists mainly of C02 and 02 to the methanol synthesis plant.

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