MANUFACTURE OF PROCESSED STARCH

• Main Authors: YONEYAMA EMI, KOBORI MICHIO
• Format: Patent
• Language: English
• Published: 14.09.1988
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; DERIVATIVES THEREOF; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; POLYSACCHARIDES; THEIR PREPARATION OR CHEMICAL WORKING-UP

PURPOSE:To obtain easily and inexpensively a processed starch without a drying step that is readily soluble in cold water and excellent in handleable property, causes no dusting, and can be suitably used as starch for washing, etc., by heat-treating and extruding a starch composition by means of a biaxial extruder, or the like under specified conditions, swelling the extrudate, and then cutting it. CONSTITUTION:100pts.wt. starch such as corn starch and potato starch are blended with 0.5-5.0pts.wt. bicarbonate such as NaHCO3, 1.0-5.0pts.wt. sulphate such as Na2SO4, 0.3-4.0pts.wt. acid such as oxalic acid, citric acid and phosphoric acid, and 2-7pts.wt. flaky or powdered polyethylene glycohol having an average molecular weight of 3,000 or more, and the pH of the mixture is adjusted to 4-7 to produce a starch composition. Then, it is placed in a continuous high-pressure pressurizing and heating apparatus equipped with mixing, transferring, heating and water supplying apparatus, for example, a biaxial extruder, and water is added thereto so that the water content may be adjusted to 10-30wt.%, and the mixture is heat-treated and extruded continuously into the atmosphere thereby allowing the extrudate to swell followed by cutting of it to obtain a processed starch in a desired shape.