Compound enzyme and application thereof in corn concentrated gluten dehydration production

Abstract

The invention discloses a compound enzyme and application thereof in corn concentrated gluten dehydration production. The compound enzyme mainly comprises the following components: xylanase, cellulase, beta-glucanase and pectinase. When the compound enzyme is added into the concentrated gluten, the water content of a plate and frame filter cake after the concentrated gluten is subjected to filter pressing can be obviously reduced by more than 3%, the yield of corn protein powder is improved, and the steam energy consumption for drying the gluten filter cake is reduced.

Description

Technical Field

[0001] The present invention relates to a compound enzyme for improving the dehydration of thick gluten in the production of corn protein powder and a method for using the enzyme in actual production. Background Art

[0002] Corn protein powder is the protein extracted from corn. During the process of wet milling of corn, a large amount of corn gluten water is generated when removing corn germ and corn husk to separate starch. The corn gluten water is concentrated by a gluten concentrator to obtain thick gluten, and then filtered and dehydrated by a plate and frame filter or a vacuum drum filter to obtain a wet filter cake. The filter cake is dried into corn protein powder through processes such as crushing and tube bundle drying. The yield of corn protein powder accounts for about 5% - 6% of the total raw materials, and the protein content is as high as 60%, making it an excellent feed protein additive.

[0003] The main products in the corn starch production industry, namely the production of corn starch, corn protein powder, and corn fiber skin, all require drying, where heat energy is used to vaporize and remove moisture, thereby reducing the moisture content of solid substances. Therefore, the production of these products requires a large amount of energy consumption. Among them, the drying of corn protein powder is more difficult than that of starch because of its high initial moisture content. Starch drying is from wet starch with about 36% moisture to a finished product with moisture within 14%, only requiring the removal of about 20% of the moisture in the material, and the starch particles are loose and easy to dry. While gluten mainly contains protein substances, has high viscosity, is easy to agglomerate, and at the same time has a very high initial moisture content for drying. After mechanical dehydration, the moisture content of wet gluten is as high as about 60%. Moreover, protein materials are difficult to store, and the moisture requirement for dry products is also lower than that of starch. The moisture requirement for the finished corn protein powder is within 12% moisture, 2% lower than that of the finished starch, and nearly 50% of the moisture needs to be removed through drying. Due to these characteristics of gluten, it makes the processing and drying of thick gluten difficult. Therefore, the assistance of the biological enzyme method can not only improve the actual production problems, significantly improve the operation difficulty of workshop workers in discharging materials, but also reduce the energy consumption of protein drying, increase the recovery rate of protein powder, increase production capacity, and make the gluten processing develop in a more energy-saving and operation-friendly direction. Summary of the Invention

[0004] The object of the present invention is to provide a compound enzyme for improving the dehydration of thick gluten in the production of corn protein powder and a method for using the enzyme in actual production.

[0005] The technological process of producing corn protein powder by dehydrating thick gluten includes the following steps: pumping the compound enzyme into a thick gluten storage tank according to a certain addition amount, reacting for at least 10 minutes, then pumping it into a filtering device, and after filtering, obtaining a gluten filter cake. The filter cake is further crushed and dried by a tube bundle to obtain the finished corn protein powder.

[0006] The main components of the compound enzyme are: 0 - 40% xylanase, 5 - 40% β-glucanase, 5 - 40% cellulase, 0 - 30% pectinase, 0 - 20% sterile water, and 0 - 20% glycerol.

[0007] The addition process and dosage of the compound enzyme are as follows: Pump the compound enzyme into the underflow outlet of the gluten concentrator with a pump, so that the enzyme enters the thick gluten storage tank together with the thick gluten, react for at least 10 minutes, and the enzyme dosage is 10 - 100 ml per ton of corn.

[0008] The present invention hardly needs to change the process parameters of the current gluten protein powder production, and the enzyme addition process is also simple and convenient. Compared with the original production process without adding enzyme preparations, it can effectively reduce the viscosity of thick gluten, quickly form a filter layer, reduce the water content of the filter cake by 3 - 10%, and increase the protein yield, bringing obvious benefits to the enterprise. Specific Embodiments

[0009] The following describes the preferred embodiments of the present invention. It should be understood that the preferred embodiments described herein are only for explaining and illustrating the present invention, and are not used to limit the present invention. Example 1

[0010] A compound enzyme for improving the dehydration of thick gluten in corn protein powder production, including xylanase, β-glucanase, cellulase, pectinase, sterile water, and glycerol. In the compound enzyme, xylanase is 30%, β-glucanase is 20%, cellulase is 10%, pectinase is 10%, sterile water is 10%, and glycerol is 20%.

[0011] The application method of the above compound enzyme is: Pump the compound enzyme into the underflow outlet of the gluten concentrator with a pump, so that the enzyme enters the thick gluten storage tank together with the thick gluten, react for 20 minutes, and the enzyme dosage is 30 ml per ton of corn.

[0012] The data such as the moisture content of the plate and frame filter cake, gas consumption, and protein powder yield of the group adding the compound enzyme and the control group without adding enzyme are as follows.

[0013] The moisture content of the filter cake in the enzyme-added group decreased significantly compared with the non-enzyme-added group. The water content of the filter cake decreased from 58.24% to 47.36%, a decrease of about 10%. As the moisture content of the filter cake decreased, the average gas consumption per shift decreased from 66.25 tons to 58.55 tons; the steam unit consumption also decreased from an average of 1.50 tons to an average of 1.31 tons, a decrease of 12%. The protein powder yield also increased. The average value increased from 4.00% to 4.09%, an increase of about 2% in the average value. Example 2

[0014] A compound enzyme for improving the dehydration of concentrated gluten in corn protein powder production, comprising xylanase, β-glucanase, cellulase, pectinase, sterile water and glycerol. In the compound enzyme, xylanase is 30%, β-glucanase is 20%, cellulase is 10%, pectinase is 10%, sterile water is 10% and glycerol is 20%.

[0015] The application method of the above compound enzyme is as follows: Pump the compound enzyme into the bottom flow outlet of the gluten concentrator with a pump, so that the enzyme enters the concentrated gluten temporary storage tank together with the concentrated gluten, react for 20 minutes, and the enzyme addition amount is 30 ml per ton of corn added.

[0016] Data such as the plate and frame filter cake moisture, gas consumption and protein powder yield of the compound enzyme addition group and the control group without enzyme addition are as follows: The water content of the plate and frame filter cake in the enzyme addition group is significantly lower than that in the non-enzyme addition group, and the filter cake moisture is reduced by about 10%. As the filter cake moisture decreases, the average gas consumption per shift also decreases from 215 tons to 207 tons, a decrease of 8 tons / shift. The protein powder yield has increased, and the average value has increased from 5.09% to 5.14%, an average increase of about 1%. Example 3

[0017] A compound enzyme for improving the dehydration of concentrated gluten in corn protein powder production, comprising xylanase, β-glucanase, cellulase, pectinase, sterile water and glycerol. In the compound enzyme, xylanase is 25%, β-glucanase is 35%, cellulase is 20%, sterile water is 10% and glycerol is 10%.

[0018] The application method of the above compound enzyme is as follows: Pump the compound enzyme into the bottom flow outlet of the gluten concentrator with a pump, so that the enzyme enters the concentrated gluten temporary storage tank together with the concentrated gluten, react for 30 minutes, and the enzyme addition amount is 15 ml per ton of corn added.

[0019] Data such as the plate and frame filter cake moisture, gas consumption and protein powder yield of the compound enzyme addition group and the control group without enzyme addition are as follows: The water content of the filter cake in the enzyme addition group is significantly lower than that in the non-enzyme addition group, and the filter cake moisture is reduced by about 4%. The protein powder yield has increased, and the average pure protein yield in the enzyme addition group has increased from 7.28 to 7.65 compared with the non-enzyme addition group, with an average increase of about 5%.

Claims

1. A compound enzyme and its application in the production of dehydrated corn thick gluten, characterized in that: Pump the compound enzyme into the concentrated gluten temporary storage tank at a certain addition amount. After reacting for at least 10 minutes, pump it into the filtering equipment. After filtration, a gluten filter cake is obtained. After the filter cake is further crushed and tube bundle dried, the finished corn protein powder is obtained.

2. The method according to claim 1, characterized in that: The components of the compound enzyme include: 0 - 40% xylanase, 5 - 40% β-glucanase, 5 - 40% cellulase, 0 - 30% pectinase, 0 - 20% sterile water, and 0 - 20% glycerol.

3. The method according to claim 1, wherein: The addition amount of the compound enzyme is 10 - 100 ml of enzyme per ton of corn.

4. The method according to claim 1, characterized in that: The addition method of the compound enzyme is to pump it into the underflow outlet of the concentrator with a pump, and enter the concentrated gluten temporary storage tank together with the concentrated gluten slurry at the underflow for reaction.

5. The method according to claim 1, characterized in that: The reaction time of the compound enzyme and the concentrated gluten is at least 10 minutes, and preferably the reaction is carried out for 10 - 30 minutes.

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