Intensification of the Processes of Subsidence of Colloidal Particles from Corn Extract

V. A. Bakulin¹, E. N. Maleeva¹ , E. N. Kuzin², N. E. Kruchinina², N. N. Gavrilova^2
1All-Russian Research Institute of Starch Products – the branch of the V. M. Gorbatov Federal Science Center of Food Systems of the RAS, ul. Nekrasova, 11, pos. Kraskovo, Lyuberetskii r-n, Moskovskaya obl., 140051, Russian Federation
²D. Mendeleev University of Chemical Technology of Russia, Miusskaya pl., 9, Moskva, Russian Federation

Abstract. Purification of liquid corn extract (CE) in corn starch enterprises allows not only to increase the duration of continuous operation of evaporators in the optimal mode but also to improve the quality of the concentrated extract that is especially important when it is stored and used in the microbiological industry. The purification of the extract by the batch type sedimentation tanks does not provide the desired results. To improve the CE purification efficiency we studied the properties of its dispersed component. The sizes of the dispersed particles that made up the extract lay in two ranges: from 50 to 950 nm and from 90 to 250 um. The particles less than 50 nm were organic compounds isolated from a supersaturated extract solution. Before evaporation, the content of insoluble particles of corn extract with a size of more than 5 microns was about 2.5 g/L; the residual content of suspended solids with a particle size of fewer than 5 microns was 173 mg/L. The rate of decantation (sedimentation) of insoluble components of the corn extract, depending on their size, varied from 0.000000146 m/h for particles of 0.05 um to 1.159200000 m/h for particles of 230 um. The intensification of the colloidal phase separation processes in the solution allowed for the use of hydrolysis products of titanium compounds and active silicic acid. For the effective removal of insoluble components from CE before evaporation, the use of batch type laminar thin-layer sedimentation tanks was recommended. Inside them, the suspension moves along the laminae in a thin layer at the lowest speed. Particles in contact with the surfaces of the laminae were retained and form sediment, which was periodically removed. Thin-layer sedimentation tanks were more efficient, provided a continuous process, and had significantly smaller dimensions.

Keywords: corn extract; dispersed phase; sedimentation; particle size.

Author Details: V. A. Bakulin, Cand. Sc. (Tech.), head of division (е-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); E. N. Maleeva, head of division; E. N. Kuzin, Cand. Sc. (Tech.), assoc. prof. (е-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); N. E. Kruchinina, D. Sc. (Tech.), prof.; N. N. Gavrilova, Cand. Sc. (Chem.), assoc. prof.

For citation: Bakulin V. A., Maleeva E. N. , Kuzin E. N., Kruchinina N. E., Gavrilova N. N. Intensification of the Processes of Subsidence of Colloidal Particles from Corn Extract. Dostizheniya nauki i tekhniki APK. 2019. Vol. 33. No.11. Pp. 78–81 (in Russ.). DOI: 10.24411/0235-2451-2019-11117.