GB286289A - Improvements in manufacture of starch - Google Patents

Abstract

286,289. Corn Products Refining Co., (Assignees of Moffett, G. M.). March 3, 1927, [Convention date]. Starch manufacture comprises steeping the corn or other starch bearing material in dilute sulphur dioxide, solution and disintegrating it, separating the product to remove germ, bran and fibre from the starch and gluten, tabling the starch, gluten and water, filtering the starch with sulphur dioxide solution to remove solubles, returning the gluten water and the starch filtrate for re-use in the process, and comprises particularly the step of removing some of the sulphur dioxide absorbed by the corn while being steeped before the material is separated. A part of the gluten water is first used for washing steeped corn to reduce its sulphur dioxide content, and is then supplied with more sulphur dioxide and used for steeping. Sulphur dioxide is introduced only at the steep and for filtering starch. Steep tanks A1 - - A11 are shown, seven being in operation in series, connected by pipes 25 and heaters 26. The corn passes to a mill B1 after washing with water from pipe 27 connected to the gluten settlers K1, K2. This water passes through a sulphur tower C1 to the next steep. The germs, floated off in a separator D1, pass through reels E1, E2, E3 and are pressed free from water at F1. Gluten overflow water passes by pipe 28 into the reel E3, by pipe 29 to the reel E2 and thence with liquid from reel E1 to separator D1, from which the settled solid passes through a drainage reel E5 to a mill B2 and then to a separator D2 to which water passes from reels E2, E5. From separator D2 the degermed material passes through a coarse reel E6 and a fine reel E7, whence the starch liquor passes to the tables, a part being diverted, if required, by pipe 36 to the germ system. The tailings of starch, gluten and bran from reels Eti, E7 pass by pipes 37, 38 to a mill B3, and thence through coarse slop reels G1 - - G4 fed with gluten overflow water to a press F2, whence water is returned to the reel G3. Starch liquor from the reel G1 passes by pipe 44 through the reel G5 to tables. The tailings from draining reel G5 pass by pipe 45 to fine slop reels H1, H2, H3 to a press F3 to collect the bran, whence the water passes to the reel H3, these reels being watered from the starch filtrates (containing sulphur dioxide added at C2) by pipe 46. Starch liquor from the reel H1 passes to the tables. The starch, gluten water and solubles pass through cleaning shakers I1, I2 to starch table J1, whence the gluten and water pass to settlers K1. The tailings from shaker I2 pass to reel H2. A second table J2 is flushed with starch filtrate water, the starch passing through a shaker I3 to the starch filters M1, M2 and a filter press N, the filtrate passing to the shaker I3 or the fine slop system. The water may be heated at L1, L2 and L3. The filters M1, M2 are used in tandem, the starch being diluted in an intermediate vessel O. Water to which sulphur dioxide is added at C2 is supplied from hot and cold pipes 61, 62. Specification 277,572 is referred to.