Method for desulfurizing corn steep liquor

Abstract

The invention belongs to the technical field of feed preparation, and relates to a corn steep liquor desulfurization method which comprises the following steps: putting corn steep liquor into a reaction kettle, adding a desulfurizer and a nutrition regulator, stirring for reaction, and then spraying and drying to obtain a desulfurized corn steep liquor finished product. The desulfurizer is at least one of hydrogen peroxide, potassium permanganate, potassium ferrate, calcium hypochlorite and sodium hypochlorite, when multiple desulfurizers are adopted, the synergistic effect of the multiple desulfurizers can be exerted through sequential or simultaneous reaction, sulfur dioxide or sulfite contained in the corn steep liquor is converted into sulfate, and the desulfurizer can be applied to the desulfurization process. The added nutrition regulator is an alkaline reagent and can provide a calcium source, and the pH value of the system and the content of trace mineral substances beneficial to animal absorption can also be increased. The method is simple in step, high in desulfurization rate, low in production cost and suitable for large-scale industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of feed preparation, and particularly relates to a method for desulfurizing corn steep liquor. Background Art

[0002] The deep processing of corn starch first requires soaking corn in a sulfite solution, and the resulting corn steeping liquid is corn steep liquor. In the deep processing of corn starch, corn steep liquor as a by-product has a large output, low cost, and a dry matter content of 6% to 8%, which has a high utilization value. Studies have shown that the dry matter content of concentrated corn steep liquor can reach 30.0% to 52.5%, and the crude protein content can reach 16.0% to 33.5%. Corn steep liquor also contains sulfite components, so the color of corn germ meal feed is darker and the smell is sour, resulting in reduced palatability of the product. Long-term feeding may cause sulfite accumulation in livestock and poultry and poisoning, affecting the growth and development of livestock and poultry. Based on the national standard "GB2760-2014 Food Additives Usage Standard", the maximum residual sulfur dioxide of edible starch is 0.03g / kg. At present, there is still a blank in the sulfur-free conversion treatment of corn steep liquor. Therefore, the development of corn steep liquor desulfurization technology can not only improve the nutritional value of corn feed, but also reduce the harm of sulfites to livestock and poultry, and realize the refined production of corn deep processing and the recycling of by-products. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for desulfurizing corn pulp, which is simple to operate and has low cost. It can effectively reduce the sulfur content while ensuring that the reaction system is not destroyed, meet industry standards, and increase its nutrition and mineral trace element content to improve the palatability and competitiveness of the product, and is suitable for industrial production.

[0004] The present invention is achieved by providing a method for desulfurizing corn steep liquor, comprising the following steps: Step 1: put corn syrup into a reactor, add a desulfurizer with a mass ratio of 0.001% to 2.0%, and stir evenly; wherein, the stirring speed is set to 300 to 600 rpm, the reaction temperature is 50°C to 60°C, and the stirring is performed for 30 to 90 minutes; Step 2: Add 0.01% to 3.0% of the nutrient regulator by mass, continue stirring for 1 to 2 hours, and set the speed to 300 to 600 rpm; Step 3: spraying and drying the mixed material after stirring in step 2 to obtain a desulfurized corn syrup product; wherein: The desulfurizer is at least one of hydrogen peroxide, potassium permanganate, potassium ferrate, calcium hypochlorite and sodium hypochlorite, and the nutritional regulator is at least one of calcium hydroxide, calcium oxide, calcium hypochlorite, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and magnesium oxide powder.

[0005] Compared with the prior art, the method for desulfurization of corn slurry of the present invention comprises the following steps: placing corn slurry in a reactor, adding a desulfurizing agent and a nutrition regulator, stirring the reaction, and then spraying and drying to obtain a finished corn slurry after desulfurization. The desulfurizing agent used in the present invention is at least one of hydrogen peroxide, potassium permanganate, potassium ferrate, calcium hypochlorite and sodium hypochlorite. When multiple desulfurizing agents are used, the synergistic effect between multiple desulfurizing agents can be exerted by reacting sequentially or simultaneously. By converting sulfur dioxide or sulfite contained in corn slurry into sulfate, it can be applied to the desulfurization process. The dosage of the reagent used in the present invention is low, and the desulfurization efficiency can be maintained, which has cost advantages. The nutrition regulator added in the present invention is an alkaline reagent and can provide a calcium source, and can also increase the system pH and the content of trace minerals that are beneficial to animal absorption. The present invention has simple steps, high desulfurization rate, low production cost, and is suitable for large-scale and industrialized production. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 The figure is a schematic flow chart of a preferred embodiment of the method for desulfurizing corn syrup of the present invention. DETAILED DESCRIPTION

[0007] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0008] Please refer to Figure 1 As shown, the arrow direction in the figure indicates the flow direction of materials and processes. A preferred embodiment of the method for desulfurizing corn syrup of the present invention comprises the following steps: Step 1: Put corn slurry into a reactor, add a desulfurizer with a mass ratio of 0.001% to 2.0%, and stir evenly; wherein, the stirring speed is set to 300 to 600 rpm, the reaction temperature is 50°C to 60°C, and the stirring is performed for 30 to 90 minutes.

[0009] Step 2: Add 0.01%~3.0% of the nutrient regulator by mass, continue stirring for 1~2 hours, and set the speed to 300~600rpm.

[0010] Step 3: spraying and drying the mixed material after stirring in step 2 to obtain a desulfurized corn syrup product.

[0011] Among them, the desulfurizer is at least one of hydrogen peroxide, potassium permanganate, potassium ferrate, calcium hypochlorite and sodium hypochlorite, and the nutritional regulator is at least one of calcium hydroxide, calcium oxide, calcium hypochlorite, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and magnesium oxide powder.

[0012] The method for desulfurizing corn steep liquor of the present invention is further described below by means of specific examples.

[0013] Example 1

[0014] The first embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 11, take 50kg corn syrup and put it into a reactor, set the reaction temperature to 50°C, the stirring speed to 300rpm, add 0.15kg of 35wt% hydrogen peroxide solution, stir evenly, react for 10min, then add 0.1kg potassium permanganate powder, and continue stirring for 20min.

[0015] Step 12: Add 0.005 kg of calcium hydroxide powder, set the stirring speed to 300 rpm, and stir for 1 hour.

[0016] Step 13, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0017] In the finished desulfurized corn syrup prepared in Example 1, the sulfur content was 0.0028%, and the desulfurization rate was 87%. The protein content before and after desulfurization was 15.6% and 15.9%, respectively, with little change. The change in ash content was close to the amount of nutritional regulator added, changing from 5.6% to 5.7%, and the ash content remained basically unchanged.

[0018] Example 2

[0019] The second embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 21, take 50kg corn syrup and put it into the reactor, set the reaction temperature to 50°C, the stirring speed to 300rpm, add 0.15kg of 35wt% hydrogen peroxide solution, stir evenly, react for 10min, then add 0.1kg potassium ferrate powder, and continue stirring for 20min.

[0020] Step 22: Add 0.71 kg of calcium oxide powder, set the stirring speed to 300 rpm, and stir for 1 hour.

[0021] Step 23, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0022] In the finished desulfurized corn syrup prepared in Example 2, the sulfur content was 0.0024%, and the desulfurization rate was 89%. The protein content before and after desulfurization was 15.5% and 16.1%, respectively, with little change. The change in ash content was similar to the amount of nutritional regulator added, increasing from 5.6% to 5.8%.

[0023] Example 3

[0024] The third embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 31, take 50kg corn slurry and put it into a reactor, set the reaction temperature to 50°C, the stirring speed to 300rpm, add 0.1kg of 35wt% hydrogen peroxide solution, stir evenly, react for 10min, then add 0.05kg of 20wt% calcium hypochlorite solution, and continue stirring for 20min.

[0025] Step 32: add 0.71 kg of calcium hydroxide powder, set the stirring speed to 300 rpm, and stir for 1 hour.

[0026] Step 33, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0027] In the finished desulfurized corn syrup prepared in Example 3, the sulfur content was 0.0026%, and the desulfurization rate was 77%. The protein content before and after desulfurization was 16.0% and 16.2%, respectively, with little change. The change in ash content was similar to the amount of nutritional regulator added, increasing from 5.5% to 7.0%.

[0028] Example 4

[0029] The fourth embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 41, take 50kg corn syrup and put it into a reactor, set the reaction temperature to 60°C, the stirring speed to 300rpm, add 0.1kg of 35wt% hydrogen peroxide solution, stir evenly, react for 10min, then add 0.05kg of 20wt% sodium hypochlorite solution, and continue stirring for 20min.

[0030] Step 42: Add 0.50 kg of calcium hydroxide powder and 0.10 kg of sodium hydroxide powder, set the stirring speed to 300 rpm, and stir for 1 hour.

[0031] Step 43, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0032] In the finished desulfurized corn syrup prepared in Example 4, the sulfur content was 0.0023%, and the desulfurization rate was 91%. The protein content before and after desulfurization was 15.9% and 16.1%, respectively, with little change. The change in ash content was similar to the amount of nutritional regulator added, increasing from 5.6% to 6.4%.

[0033] Example 5

[0034] The fifth embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 51, take 50kg corn syrup and put it into a reactor, set the reaction temperature to 50°C, the stirring speed to 300rpm, add 0.3kg potassium permanganate powder, stir evenly, and react for 30min.

[0035] Step 52: Add 0.50 kg of calcium oxide powder and 0.10 kg of potassium hydroxide powder, set the stirring speed to 300 rpm, and stir for 1 hour.

[0036] Step 53, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0037] In the finished desulfurized corn syrup prepared in Example 5, the sulfur content was 0.0024%, and the desulfurization rate was 95%. The protein content before and after desulfurization was 15.6% and 16.0%, respectively, with little change. The change in ash content was similar to the amount of nutritional regulator added, increasing from 5.5% to 7.1%.

[0038] Example 6

[0039] The sixth embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 61: put 50 kg corn syrup into a reactor, set the reaction temperature to 50° C., stir at 300 rpm, add 0.3 kg potassium ferrate powder, stir evenly, and react for 30 minutes.

[0040] Step 62: Add 0.50 kg of calcium hypochlorite powder and 0.10 kg of sodium carbonate powder, set the stirring speed to 300 rpm, and stir for 1 hour.

[0041] Step 63, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0042] In the finished desulfurized corn syrup prepared in Example 6, the sulfur content was 0.0024%, and the desulfurization rate was 85%. The protein content before and after desulfurization was 15.5% and 15.8%, respectively, with little change. The change in ash content was similar to the amount of nutritional regulator added, increasing from 5.4% to 7.6%.

[0043] Example 7

[0044] The seventh embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 71, take 50kg corn syrup and put it into a reactor, set the reaction temperature to 50°C, the stirring speed to 300rpm, add 0.50kg calcium hypochlorite powder, stir evenly, and react for 30min.

[0045] Step 72: Add 0.50 kg of calcium hydroxide powder and 0.10 kg of sodium bicarbonate powder, set the stirring speed to 300 rpm, and stir for 1 hour.

[0046] Step 73, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0047] In the finished desulfurized corn syrup prepared in Example 7, the sulfur content was 0.0025%, and the desulfurization rate was 92%. The protein content before and after desulfurization was 16.2% and 16.1%, respectively, with little change. The change in ash content was similar to the amount of nutritional regulator added, increasing from 5.5% to 7.3%.

[0048] Example 8

[0049] The eighth embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 81, take 50kg corn slurry and put it into a reactor, set the reaction temperature to 60°C, the stirring speed to 300rpm, add 3kg of 20wt% sodium hypochlorite solution, stir evenly, and react for 30min.

[0050] Step 82: Add 0.50 kg of calcium oxide powder and 0.10 kg of magnesium oxide powder, set the stirring speed to 300 rpm, and stir for 1 hour.

[0051] Step 83, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0052] In the finished desulfurized corn syrup prepared in Example 8, the sulfur content was 0.0024%, and the desulfurization rate was 92%. The protein content before and after desulfurization was 16.0% and 15.8%, respectively, with little change. The change in ash content was similar to the amount of nutritional regulator added, increasing from 5.6% to 6.1%.

[0053] Example 9

[0054] A ninth embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 91, take 50kg corn syrup and put it into a reactor, set the reaction temperature to 60°C, the stirring speed to 300rpm, add 0.0014kg of 35wt% hydrogen peroxide solution, stir evenly, and stir the reaction for 30min.

[0055] Step 92: Add 1.50 kg of calcium hypochlorite powder, 0.10 kg of sodium hydroxide powder and 0.05 kg of sodium carbonate powder, set the stirring speed to 600 rpm, and stir for 2 hours.

[0056] Step 93, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0057] In the finished desulfurized corn syrup prepared in Example 9, the sulfur content was 0.0029%, and the desulfurization rate was 83%. The protein content before and after desulfurization was 15.8% and 15.9%, respectively, with little change. The change in ash content was similar to the amount of nutritional regulator added, increasing from 5.4% to 8.2%.

[0058] Example 10

[0059] The tenth embodiment of the method for desulfurizing corn steep liquor of the present invention comprises the following steps: Step 101, take 50kg corn syrup and put it into a reactor, set the reaction temperature to 60°C, the stirring speed to 600rpm, add 2.86kg of 35wt% hydrogen peroxide solution, stir evenly, and stir and react for 90min.

[0060] Step 102: add 1 kg of calcium hydroxide powder, 0.10 kg of sodium hydroxide powder and 0.05 kg of sodium carbonate powder, set the stirring speed to 600 rpm, and stir for 2 hours.

[0061] Step 103, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

[0062] In the finished desulfurized corn syrup prepared in Example 10, the sulfur content was 0.0022%, and the desulfurization rate was 94%. The protein content before and after desulfurization was 15.7% and 16.1%, respectively, with little change. The change in ash content was similar to the amount of nutritional regulator added, increasing from 5.5% to 7.4%.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for desulfurizing corn steep liquor, characterized in that: The steps include: Step 1: put corn syrup into a reactor, add a desulfurizer with a mass ratio of 0.001% to 2.0%, and stir evenly; wherein, the stirring speed is set to 300 to 600 rpm, the reaction temperature is 50°C to 60°C, and the stirring is performed for 30 to 90 minutes; Step 2: Add 0.01% to 3.0% of a nutrient regulator by mass, continue stirring for 1 to 2 hours, and set the speed to 300 to 600 rpm; Step 3: spraying and drying the mixed material after stirring in step 2 to obtain a desulfurized corn syrup product; wherein: The desulfurizer is at least one of hydrogen peroxide, potassium permanganate, potassium ferrate, calcium hypochlorite and sodium hypochlorite, and the nutritional regulator is at least one of calcium hydroxide, calcium oxide, calcium hypochlorite, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate and magnesium oxide powder.

2. The method for desulfurizing corn steep liquor according to claim 1, characterized in that: The steps include: Step 11, take 50kg corn steep liquor and put it into a reactor, set the reaction temperature to 50°C, the stirring speed to 300rpm, add 0.15kg of 35wt% hydrogen peroxide solution, stir evenly, react for 10min, then add 0.1kg potassium permanganate powder, and continue stirring for 20min; Step 12, add 0.005 kg of calcium hydroxide powder, set the stirring speed to 300 rpm, and stir for 1 hour; Step 13, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

3. The method for desulfurizing corn steep liquor according to claim 1, characterized in that: The steps include: Step 21, take 50kg corn steep liquor and put it into a reactor, set the reaction temperature to 50°C, the stirring speed to 300rpm, add 0.15kg of 35wt% hydrogen peroxide solution, stir evenly, react for 10min, then add 0.1kg potassium permanganate powder, and continue stirring for 20min; Step 22, add 0.71 kg of calcium oxide powder, set the stirring speed to 300 rpm, and stir for 1 hour; Step 23, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

4. The method for desulfurizing corn steep liquor according to claim 1, characterized in that: The steps include: Step 31, take 50kg corn steep liquor and put it into a reactor, set the reaction temperature to 50°C, the stirring speed to 300rpm, add 0.1kg of 35wt% hydrogen peroxide solution, stir evenly, react for 10min, then add 0.05kg of 20wt% sodium hypochlorite solution, and continue stirring for 20min; Step 32, add 0.71 kg of calcium hydroxide powder, set the stirring speed to 300 rpm, and stir for 1 hour; Step 33, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

5. The method for desulfurizing corn steep liquor according to claim 1, characterized in that: The steps include: Step 41, taking 50 kg of corn steep liquor and putting it into a reactor, setting the reaction temperature to 60° C., stirring speed to 300 rpm, adding 0.1 kg of 35 wt% hydrogen peroxide solution, stirring evenly, reacting for 10 min, then adding 0.05 kg of 20 wt% sodium hypochlorite solution, and continuing stirring for 20 min; Step 42, add 0.50 kg of calcium hydroxide powder and 0.10 kg of sodium hydroxide powder, set the stirring speed to 300 rpm, and stir for 1 hour; Step 43, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

6. The method for desulfurizing corn steep liquor according to claim 1, characterized in that: The steps include: Step 51, put 50 kg corn syrup into a reactor, set the reaction temperature to 50° C., stir at 300 rpm, add 0.3 kg potassium permanganate powder, stir evenly, and react for 30 min; Step 52, add 0.50 kg of calcium oxide powder and 0.10 kg of sodium hydroxide powder, set the stirring speed to 300 rpm, and stir for 1 hour; Step 53, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

7. The method for desulfurizing corn steep liquor according to claim 1, characterized in that: The steps include: Step 61, put 50 kg corn steep liquor into a reactor, set the reaction temperature to 50° C., stir at 300 rpm, add 0.3 kg potassium ferrate powder, stir evenly, and react for 30 min; Step 62, add 0.50 kg of calcium hypochlorite powder and 0.10 kg of sodium carbonate powder, set the stirring speed to 300 rpm, and stir for 1 hour; Step 63, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

8. The method for desulfurizing corn steep liquor according to claim 1, characterized in that: The steps include: Step 71, put 50 kg corn steep liquor into a reactor, set the reaction temperature to 50° C., stir at 300 rpm, add 0.50 kg calcium hypochlorite powder, stir evenly, and react for 30 min; Step 72, add 0.50 kg of calcium hydroxide powder and 0.10 kg of sodium bicarbonate powder, set the stirring speed to 300 rpm, and stir for 1 hour; Step 73, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

9. The method for desulfurizing corn steep liquor according to claim 1, characterized in that: The steps include: Step 81, take 50kg corn steep liquor and put it into a reactor, set the reaction temperature to 60°C, the stirring speed to 300rpm, add 3.00kg sodium hypochlorite solution with a concentration of 20wt%, stir evenly, and react for 30min; Step 82, add 0.50 kg of calcium oxide powder and 0.10 kg of magnesium oxide powder, set the stirring speed to 300 rpm, and stir for 1 hour; Step 83, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

10. The method for desulfurizing corn steep liquor according to claim 1, characterized in that: The steps include: Step 91, put 50 kg corn steep liquor into a reactor, set the reaction temperature to 50° C., stir at 300 rpm, add 0.0014 kg 35 wt % hydrogen peroxide solution, stir evenly, and stir for 30 min; Step 92, add 1.50 kg of calcium hypochlorite powder, 0.10 kg of sodium hydroxide powder and 0.05 kg of sodium carbonate powder, set the stirring speed to 600 rpm, and stir for 2 hours; Step 93, spraying and drying the stirred mixture to obtain a desulfurized corn syrup product.

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