Soybean protein concentrate processing technology

Abstract

The invention belongs to the technical field of soybean processing, and particularly relates to a soybean protein concentrate processing technology which comprises the following steps: step 1, raw material pretreatment and acid precipitation; step 2, dehydration treatment; step 3, drying treatment; step 4, dedusting and conveying; step 5, packaging; raw material pretreatment and acid precipitation are as follows: low-temperature squeezed soybean cake powder is put into a stirring tank, treated pure hot water with the temperature being 50-55 DEG C and the volume being 7 times that of the materials is added into the tank, meanwhile, citric acid is added and stirred until the materials are fully dissolved, and the materials are soaked and stirred for 40-45 minutes, so that water-soluble components in the materials are fully dissolved. The method solves the problems of low raw material utilization rate, difficulty in product activity control and byproduct waste in the traditional process, realizes efficient preparation of the soybean protein concentrate and recycling of byproducts, and improves production benefits and product quality.

Description

Technical Field

[0001] This invention belongs to the field of soybean processing technology, and specifically relates to a soybean protein concentrate processing technology. Background Technology

[0002] In the field of soybean protein processing, soybean protein concentrate, as an important protein product, is widely used in the food and feed industries. Traditional soybean protein concentrate processing technology often suffers from problems such as low raw material utilization, unstable product activity control, and serious waste of by-products. For example, some processes fail to accurately control temperature and reagent dosage during the raw material processing stage, resulting in insufficient dissolution of soluble components in the material and affecting the efficiency of subsequent protein extraction. In the drying stage, improper control of hot air temperature and filtration conditions can easily lead to excessive moisture content in the product or urease activity that does not meet feed standards. In addition, most processes do not effectively recover by-products such as soybean water generated during processing, which not only reduces the overall utilization rate of raw materials but may also increase wastewater treatment costs and environmental burden.

[0003] To address the aforementioned issues, there is an urgent need for a soybean protein concentrate processing technology that features standardized procedures, precise parameters, and the ability to efficiently prepare the main product and recover by-products, thereby improving product quality and the comprehensive utilization rate of raw materials while reducing production energy consumption and costs. Summary of the Invention

[0004] The purpose of this invention is to provide a processing technology for soybean protein concentrate that solves the problems of low raw material utilization, difficulty in controlling product activity, and waste of by-products in traditional processes, thereby achieving efficient preparation of soybean protein concentrate and recycling of by-products, and improving production efficiency and product quality.

[0005] The specific technical solution adopted by this invention is as follows: A process for processing soybean protein concentrate includes the following steps: Step 1. Raw material pretreatment and acid precipitation; Step 2. Dehydration treatment; Step 3. Drying treatment; Step 4. Dust removal and conveying; Step 5. Packaging; Step 6. By-product recycling.

[0006] In a preferred embodiment, the raw material pretreatment and acid precipitation involves putting low-temperature pressed soybean cake powder into a mixing tank, adding purified hot water at a temperature of 50°C to 55°C and a volume of 7 times that of the material into the tank, adding citric acid at the same time and stirring until fully dissolved, and soaking and stirring the material for 40 to 45 minutes to fully dissolve the water-soluble components in the material.

[0007] In a preferred embodiment, the dehydration process involves conveying the material after soaking and stirring in step 1 to a plate and frame filter press for material separation and dehydration to obtain dehydrated material and soybean water.

[0008] In a preferred embodiment, the drying process involves feeding the dehydrated material from step 2 into a flash evaporator via a conveyor belt, and introducing filtered air heated to 200°C into the flash evaporator to ensure full contact between the material and the hot air, thereby evaporating moisture and reducing the urease activity in the material to a level permissible for feed use, resulting in dried soybean protein concentrate.

[0009] In a preferred embodiment, the dust removal and conveying process involves feeding the dried material from step 3 into a cyclone dust collector for unloading to obtain the finished soy protein concentrate; conveying the finished soy protein concentrate to the receiving room via a closed-pipe pneumatic conveying method; and installing a bag filter downstream of the cyclone dust collector to recover trace amounts of soy protein concentrate carried out by the cyclone dust collector.

[0010] In a preferred embodiment, the packaging involves packaging the finished soy protein concentrate that has been conveyed to the receiving room in step 4, thereby completing the processing of the soy protein concentrate; wherein the output of the finished soy protein concentrate is 70% to 72% of the weight of the raw material low-temperature pressed soybean meal.

[0011] In a preferred embodiment, the by-product recycling includes soybean water treatment and by-product drying and packaging. The soybean water treatment involves conveying the soybean water discharged from the plate and frame filter press in step 2 of claim 1 to a sedimentation centrifuge for centrifugation to separate soybean cake fine powder. The by-product drying and packaging involves drying the separated soybean cake fine powder and then packaging it. The yield of soybean cake fine powder is 5% to 6% of the weight of the raw material low-temperature pressed soybean cake powder.

[0012] In a preferred embodiment, the amount of citric acid added in step 1 is determined to achieve the subsequent acid precipitation effect and promote the dissolution of soluble components in the material, and it is necessary to ensure that the citric acid is fully dissolved in pure hot water.

[0013] In a preferred embodiment, the operating parameters of the flash evaporator in step 3 need to be adapted to the material drying requirements to ensure that the material is in full contact with the 200°C filtered air, so as to ensure effective evaporation of moisture and that the urease activity meets the standards.

[0014] In a preferred embodiment, the operating parameters of the sedimentation centrifuge in step 1 must meet the requirements for separating soybean water to ensure effective separation of soybean cake fine powder; the drying conditions of the soybean cake fine powder in step 2 are based on ensuring the dryness of the fine powder and facilitating subsequent packaging.

[0015] The technical effects achieved by this invention are as follows: Improved raw material utilization: This process combines the processing of main products with the recycling of by-products, which greatly improves the overall utilization rate of low-temperature pressed soybean meal. The main product, soybean protein concentrate, is produced at a rate of 70% to 72% of the raw material weight, and the by-product, soybean meal fine powder, is produced at a rate of 5% to 6% of the raw material weight, effectively reducing raw material waste.

[0016] Ensuring product quality: By precisely controlling the water temperature (50℃~55℃), water volume (7 times the material volume), and stirring time (40 minutes~45 minutes) during the acid precipitation stage, as well as the hot air temperature (200℃) during the drying stage, we ensure that the soluble components in the material are fully dissolved, while reducing the urease activity to the level permissible for feeding, thus ensuring stable product quality.

[0017] Reduce resource waste and environmental burden: By treating the soybean water discharged from the plate and frame filter press with a sedimentation centrifuge, the soybean cake powder is separated and recovered, avoiding the waste of resources caused by the direct discharge of by-products, while reducing the pressure on wastewater treatment and reducing the environmental burden.

[0018] The process is highly efficient and stable: The process uses plate and frame filter presses, flash evaporators, cyclone dust collectors, bag filters and other equipment to work together, and is combined with closed pipeline air conveying, which realizes the automation and continuity of the processing flow, improves production efficiency and effectively avoids the pollution and loss of materials during the transportation process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a soybean protein concentrate processing technology according to the present invention. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Please see Figure 1 As shown, the present invention provides a soybean protein concentrate processing technology, including the following steps: Step 1. Raw material pretreatment and acid precipitation; Step 2. Dehydration treatment; Step 3. Drying treatment; Step 4. Dust removal and conveying; Step 5. Packaging; Step 6. By-product recycling.

[0022] The raw material pretreatment and acid precipitation involves putting low-temperature pressed soybean cake powder into a mixing tank, adding purified hot water at a temperature of 50℃~55℃ and a volume of 7 times that of the material, and simultaneously adding citric acid and stirring until fully dissolved. The material is then soaked and stirred for 40 to 45 minutes to ensure that the water-soluble components in the material are fully dissolved.

[0023] The dehydration process involves conveying the material after soaking and stirring in step 1 to a plate and frame filter press for material separation and dehydration, resulting in dehydrated material and soybean water.

[0024] The drying process involves feeding the dehydrated material from step 2 into a flash evaporator via a conveyor belt. Filtered air heated to 200°C by a heater is introduced into the flash evaporator to ensure full contact between the material and the hot air, thereby evaporating moisture and reducing the urease activity in the material to a level permissible for feed use, resulting in dried soybean protein concentrate.

[0025] Dust removal and conveying involves feeding the dried material from step 3 into a cyclone dust collector for unloading to obtain the finished soy protein concentrate; the finished soy protein concentrate is then transported to the receiving room via a closed-pipe pneumatic conveying method; a bag filter is installed downstream of the cyclone dust collector to recover trace amounts of soy protein concentrate carried out by the cyclone dust collector.

[0026] Packaging involves packaging the finished soy protein concentrate that was transported to the receiving room in step 4, thus completing the processing of soy protein concentrate; the output of finished soy protein concentrate is 70% to 72% of the weight of the raw material low-temperature pressed soybean meal.

[0027] By-product recycling includes soybean water treatment and by-product drying and packaging. Soybean water treatment involves transporting the soybean water discharged from the plate and frame filter press in step 2 of claim 1 to a sedimentation centrifuge for centrifugation to separate soybean cake fine powder. By-product drying and packaging involves drying the separated soybean cake fine powder and then packaging it. The output of soybean cake fine powder is 5% to 6% of the weight of the raw material low-temperature pressed soybean cake powder.

[0028] The amount of citric acid added in step 1 should be sufficient to achieve the subsequent acid precipitation effect and promote the dissolution of soluble components in the material, and it is necessary to ensure that the citric acid is fully dissolved in pure hot water.

[0029] In step 3, the operating parameters of the flash evaporator must be adapted to the material drying requirements to ensure that the material is in full contact with the 200°C filtered air, so as to ensure effective evaporation of moisture and that the urease activity meets the standards.

[0030] In step 1, the operating parameters of the sedimentation centrifuge must meet the requirements for separating soybean water to ensure effective separation of soybean cake fine powder; in step 2, the drying conditions for the soybean cake fine powder should be based on ensuring the dryness of the fine powder and facilitating subsequent packaging.

[0031] In this invention, the design combining main product processing with by-product recycling significantly improves the overall utilization rate of low-temperature pressed soybean meal. The main product, soybean protein concentrate, yields 70%–72% of the raw material weight, while the by-product, fine soybean meal, yields 5%–6% of the raw material weight, effectively reducing raw material waste. Precise control of the water temperature (50℃–55℃), water volume (7 times the material volume), and stirring time (40–45 minutes) during the acid precipitation stage, as well as the hot air temperature (200℃) during the drying stage, ensures the complete dissolution of soluble components in the material. Simultaneously, urease activity is reduced to the allowable level for feed use, ensuring stable product quality. Soybean water discharged from the plate and frame filter press is treated by a sedimentation centrifuge, separating and recovering soybean cake powder, avoiding resource waste caused by direct discharge of by-products, reducing wastewater treatment pressure, and minimizing environmental burden. The process employs plate and frame filter presses, flash evaporators, cyclone dust collectors, and bag filters working together, along with closed-pipe pneumatic conveying, achieving automation and continuity of the processing flow, improving production efficiency, and effectively avoiding contamination and loss of materials during transportation.

[0032] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A processing technology for soybean protein concentrate, characterized in that: Includes the following steps: Step 1. Raw material pretreatment and acid precipitation; Step 2. Dehydration treatment; Step 3. Drying treatment; Step 4. Dust removal and conveying; Step 5. Packaging; Step 6. By-product recycling.

2. The soybean protein concentrate processing technology according to claim 1, characterized in that: The raw material pretreatment and acid precipitation involve putting low-temperature pressed soybean cake powder into a mixing tank, adding purified hot water at a temperature of 50℃~55℃ and a volume of 7 times that of the material into the tank, adding citric acid at the same time and stirring until fully dissolved, and soaking and stirring the material for 40 to 45 minutes to fully dissolve the water-soluble components in the material.

3. The soybean protein concentrate processing technology according to claim 2, characterized in that: The dehydration process involves conveying the material soaked and stirred in step 1 to a plate and frame filter press for material separation and dehydration, resulting in dehydrated material and soybean water.

4. The soybean protein concentrate processing technology according to claim 3, characterized in that: The drying process involves feeding the dehydrated material from step 2 into a flash evaporator via a conveyor belt, and introducing filtered air heated to 200°C into the flash evaporator to ensure full contact between the material and the hot air, thereby evaporating moisture and reducing the urease activity in the material to a level permissible for feed use, resulting in dried soybean protein concentrate.

5. The soybean protein concentrate processing technology according to claim 4, characterized in that: The dust removal and conveying process involves feeding the dried material from step 3 into a cyclone dust collector for unloading to obtain the finished soy protein concentrate; transporting the finished soy protein concentrate to the receiving room via a closed-pipe pneumatic conveying method; and installing a bag filter downstream of the cyclone dust collector to recover trace amounts of soy protein concentrate carried out by the cyclone dust collector.

6. The soybean protein concentrate processing technology according to claim 5, characterized in that: The packaging refers to packaging the finished soy protein concentrate that is transported to the receiving room in step 4, thereby completing the processing of soy protein concentrate; wherein, the output of finished soy protein concentrate is 70% to 72% of the weight of the raw material low-temperature pressed soybean meal.

7. The soybean protein concentrate processing technology according to claim 6, characterized in that: The by-product recycling includes soybean water treatment and by-product drying and packaging. The soybean water treatment involves conveying the soybean water discharged from the plate and frame filter press in step 2 of claim 1 to a sedimentation centrifuge for centrifugation to separate soybean cake fine powder. The by-product drying and packaging involves drying the separated soybean cake fine powder and then packaging it. The output of soybean cake fine powder is 5% to 6% of the weight of the raw material low-temperature pressed soybean cake powder.

8. The soybean protein concentrate processing technology according to claim 7, characterized in that: The amount of citric acid added in step 1 should be sufficient to achieve the subsequent acid precipitation effect and promote the dissolution of soluble components in the material, and it is necessary to ensure that the citric acid is fully dissolved in pure hot water.

9. The soybean protein concentrate processing technology according to claim 8, characterized in that: In step 3, the operating parameters of the flash evaporator must be adapted to the material drying requirements to ensure that the material is in full contact with the 200°C filtered air, so as to ensure effective evaporation of moisture and that the urease activity meets the standards.

10. A soybean protein concentrate processing technology according to claim 9, characterized in that: In step 1, the operating parameters of the sedimentation centrifuge must meet the requirements for separating soybean water to ensure effective separation of soybean cake fine powder; in step 2, the drying conditions for the soybean cake fine powder should be based on ensuring the dryness of the fine powder and facilitating subsequent packaging.

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