Raw sugar and ethanol production method using selective fermentation

A method for producing raw sugar and ethanol comprising the steps of:

• heating and clarifying a plant-origin sugar juice;
• concentrating the clear sugar juice so that Brix value of the clear sugar juice is 15 to 40%;
• cooling the syrup to a fermentation temperature;
• fermenting the syrup, thereby selectively converting the saccharide components other than sucrose in the syrup into ethanol;
• concentrating the fermented solution;
• and
• crystallizing sugar from the concentrated fermented solution.

A method for producing raw sugar and ethanol comprising the steps of:

• heating and clarifying a plant-origin sugar juice;
• introducing the clear sugar juice into a multiple-effect evaporator tube;
• concentrating the clear sugar juice so that Brix value of the clear sugar juice is 15 to 40% by letting the clear sugar juice pass through an evaporator tube placed in the first position of the multiple-effect evaporator tube and thereafter drawing the clear sugar juice before introducing the clear sugar juice into an evaporator tube placed in the last position of the multiple-effect evaporator tube;
• cooling the syrup to a fermentation temperature;
• fermenting the syrup, thereby selectively converting the saccharide components other than sucrose in the syrup into ethanol;
• heating the fermented solution to a concentration temperature;
• concentrating the fermented solution by letting the fermented solution pass through an evaporator tube placed in the next position of the evaporator tube from which the syrup is drawn;
• and
• crystallizing sugar from the concentrated fermented solution.