| 摘要 |
PURPOSE:To provide nonwashing rice needless to wash, also capable of improving its polishing yield. CONSTITUTION:In an extraction tank 12, rice 10 is brought into contact with liquid carbon dioxide or carbon dioxide in a supercritical state to extract the lipid component in the rice 10 into the carbon dioxide to effect dissolution of such component in the carbon dioxide. The pressure of the resultant carbon dioxide is reduced using a backpressure valve 16 and the carbon dioxide is brought to the inlet of a separatory tank 14 where the lipid component is separated from the carbon dioxide because the depressurized carbon dioxide less dissolves the lipid component. The carbon dioxide freed from the lipid component is passed through a filter 20, an activated carbon adsorption column 22, into a condenser 24 where it is liquefied again and returned to a high-pressure pump 26. With such carbon dioxide circulation, the lipid content of the rice can be reduced to about 0.8wt.%, a level attained by further washing normal polished rice (89-90% in polishing yield). |
