The invention relates to a method for improving the extraction rate of
corn starch by virtue of
extrusion and cooking. The method adopts an
extrusion and cooking technology to process the
corn starch.The temperature of six sections of an extruder is as follows: the temperature of section I is 25 to 35 DEG C, the temperature of the section II is 30 to 40 DEG C, the temperature of the section III is 35 to 45 DEG C, the temperature of the section IV is 40 to 50 DEG C, the temperature of the section V is 45 to 55 DEG C, the temperature of the section VI is 50 to 60 DEG C, the screw revolution is150 to 350 rpm, the material
water content is 20 to 40 percent, and an aperture of a
grinding head of the extruder is in a circular shape or a rectangular shape. Compared with the traditional wet-method
corn starch extraction process, on the premise of ensuring the purity of the
starch, the soaking time of the corn can be reduced by 50.00 percent, the addition amount of the
sulfinic acid is reduced by 33.33 percent, the
starch extraction rate is increased by 33.52 percent, and the extraction rate of the corn
starch is significantly improved. The equipment used in the method is single, the
processing method is simple and easy, the production cost is low, the time consumption is short, and the industrialized production is facilitated.