Membrane separation process for corn starch production

Abstract

The invention relates to a membrane separation process for corn starch production, belonging to the technical field of a starch production process. In the process, corns are soaked, crushed and finely grounded to prepare powder and liquid, and dry substances and filtrate are separated automatically in a closed, fully automatic and multi-tube pressure filter through a solid-liquid separation device which mainly comprises a membrane component, a manipulator and a control system. Starch and protein particles are completely intercepted and recovered by an ultrafiltration membrane under the pressure difference of 0.1-0.5MPa, and the recovery rate is more than 99 percent. The filtrate is clean water and can be repeatedly recycled, the water consumption and energy consumption are low, and no emissions can be discharged. The separation system can operate fully automatically and has high reliability. Compared with the traditional separation technology using the plate frame type pressure filter with filter cloth as a medium, the membrane separation process has significant advantages, can be used for corn starch production and production of other types of starch, and has broad application prospects.

Description

Technical field [0001] The invention relates to a corn starch production process, in particular to a membrane separation process of dry matter and filtrate in corn starch production. Background technique [0002] my country is a major corn-producing country, as well as a major corn-processing and starch-producing country. Corn starch is an indispensable and important raw material in food, pharmaceutical, chemical, textile, light industry and other industries. For a long time, the vast majority of corn starch manufacturers in my country have used plate and frame filter presses or suction filters with filter cloth as the medium to separate the dry matter and filtrate in the powder liquid. Since the filter cloth can remove starch particles and proteins above 1 μm, The particle interception effect is not good, resulting in a large amount of starch and starch protein loss during the corn starch production process, serious wastewater pollution, and a large process water loss durin...

AI Technical Summary

Problems solved by technology

For a long time, the vast majority of corn starch production enterprises in my country have used plate-and-frame filter presses or suction filters with filter cloth as the medium to separate the dry matter in the powder liquid from the filtrate. The particle interception effect is not good, resulting in the loss of starch and starch protein in the production process of corn starch, serious wastewater pollution, and large loss of process water in the production process

Usually, the loss of starch is 8%-10%, and the loss of protein is more than 20%; the COD content in the wastewater is as high as 10000mg / L; the production of each ton of starch consumes more than 5-10 tons of water, and the wastewater cannot be recycled.