At present, the separation and extraction process methods of transparent xanthan gum products mainly include direct drying method, ultrafiltration membrane separation method, organic solvent precipitation method and salting-out precipitation method, but their application is restricted by their own conditions.
Using drum drying or spray drying methods to dry the fermentation broth has simple process, convenient operation and low cost, but it cannot remove the pigment and impurities such as organic and inorganic substances in it.
The use of ultrafiltration to concentrate the highly transparent xanthan gum fermentation broth can greatly reduce the amount of alcohol, and the quality of transparent xanthan gum has been improved, but it is difficult to establish large-scale industrialized equipment.
It is currently the most widely used mature method for extracting highly transparent xanthan gum in the industry. However, this method requires the use of a large amount of alcohol and consumes a large amount of energy in the process of alcohol recovery. At the same time, the loss of alcohol is inevitable, which pollutes the environment on the one hand, and on the other Increase the production cost of high transparent xanthan gum.
Inorganic salt is added during the alcohol precipitation process, thereby reducing the amount of alcohol used in the alcohol precipitation process, but this method affects the quality of the highly transparent xanthan gum to a certain extent.
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