Method for recovering coin protein sugar dregs and preparing protein nitrogen sources and nitrogen-containing syrup

Abstract

The invention discloses a method for recovering coin protein sugar dregs and preparing protein nitrogen sources and nitrogen-containing syrup in the production of enzymatic corn starch sugar, comprising the steps of size mixing, liquefying, saccharifying, standing separation, centrifugal separation, proteolysis, concentration, drying, compounding, and the like. In the invention, protein is condensed under the heat flash of liquefying, the protein sugar dregs concentrate and float upwards in saccharifying, the sugar dregs are recovered through the steps of standing separation and centrifugal separation, the sugar dregs are dried into protein, or the sugar dregs are hydrolyzed to prepare protein nitrogen sources, and the nitrogen sources can be compounded with syrup to form nitrogen-containing starch syrup for fermenting. Clarified saccharification liquid after centrifugal separation is decolored, filtered, refined and concentrated, and starch syrup products are obtained. The majority of lentous sugar dregs in the saccharification liquid are removed before the treatment of decoloring and filtering, and the decoloring and filtering performance of the material is better. The use level of active carbon, and the like can be properly reduced, the production capability of filtering equipment is improved, and the frequency of the loading and unloading of filters as well as the consumption of washing waste water and various kinds of loss are greatly reduced.

Description

technical field [0001] The invention relates to the recovery and utilization of impurity protein in starch raw materials in the enzymatic corn starch sugar production process, in particular to the recovery of corn protein sugar grains and the method for preparing protein nitrogen source and nitrogen-containing syrup. Background technique [0002] Corn is one of the most important grains in the world and also in China. It is widely planted and has a high yield. It can be used as food directly and has a wide range of industrial uses. Corn (grain) mainly contains starch, and its starch content accounts for more than 70% of the dry weight of corn kernels. In addition, it also contains components such as protein, fat, fiber, ash and soluble sugars. Corn is the most important raw material for starch production. The proportion of corn starch in the world's total starch production is far ahead, and it is the same in China, which is more than 75%. Wet milling method is the most comm...

AI Technical Summary

Problems solved by technology

[0013] (3) The disc centrifuge is separated at a higher temperature and a considerable amount of water evaporates, and the equipment control and operating environment conditions become more complicated, which also has an adverse effect on the stable and stable operation of the centrifuge, and large fluctuations occur is also inevitable

Since the saccharification liquid in the later stage of sugar production needs to be decolorized and filtered, these companies simply canceled the step of removing the protein in the liquefied liquid by the disc centrifuge, which became the current domestic starch sugar production process: starch→adjustment Slurry→liquefaction→cooling→saccharification→decolorization→filtration→refining→concentration→starch syrup, protein and other impurities in starch are mainly removed in the stage of filtration, so the adverse effect of protein has not been overcome