CN116210800A - Method for regulating and controlling quality of soybean protein isolate by using in-situ on-line monitoring technology system - Google Patents
Method for regulating and controlling quality of soybean protein isolate by using in-situ on-line monitoring technology system Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
- A23J1/00—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites
- A23J1/14—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites from leguminous or other vegetable seeds; from press-cake or oil-bearing seeds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a method for regulating and controlling the quality of soybean protein isolate by utilizing an in-situ on-line monitoring technology system, belongs to the technical field of vegetable protein processing, and solves the problem of a method for producing soybean protein isolate by monitoring core parameters in the processing process of oil byproduct protein. The method is realized based on a protein separation process system and a process engineering control system; the method is based on the traditional production process of 'alkali dissolution and acid precipitation', and the system for monitoring the core parameters in the processing process of the oil byproduct protein, including the change of the processing core parameters such as the processing process protein concentration, temperature, pH, ionic strength, viscosity and the like, can detect the system in real time, so that the production process system for producing the soybean protein isolate by the alkali dissolution and acid precipitation method can be better controlled according to the detection result, and the requirements of on-line detection and regulation of the core parameters are effectively met.
Description
Technical Field
The invention belongs to the technical field of vegetable protein processing, and particularly relates to a method for regulating and controlling the quality of soybean protein isolate by using an in-situ on-line monitoring technology system.
Background
At present, the main flow production process for large-scale industrialized production of soybean protein isolate is an alkali-dissolution acid precipitation method, in the whole production process flow of the soybean protein isolate, alkali-dissolution extraction, acid precipitation and neutralization sections are very important links, and the soybean protein isolate is prepared by extracting soluble proteins in defatted soybean meal from low-temperature defatted soybean slices through procedures such as alkali-dissolution extraction, acid polymerization modification, spray drying and the like, so that the protein extraction rate is more than 90%. The method is characterized in that the industrial bottleneck problems of wide standardization rate, rough key technical parameters and fluctuation of product quality exist in the current soybean protein isolate industrial production process, the modern industrial production technology is required to be adopted to strictly control parameters of the whole production process flow of soybean protein isolate, the change of processing core parameters such as temperature, pH, ionic strength and viscosity in the oil protein processing process is researched, the structure-activity relationship between the processing condition of the oil protein and the functional quality of the product is discussed, the standardization degree control of the processing production of the protein product is realized, a technical system method for in-situ monitoring of the protein quality is created, the structure-activity relationship between the processing condition and the functional quality is established through the monitoring of the core parameters in the processing process of the oil by-product protein, the stabilization of the oil processing and the improvement of the quality precision degree are realized, and a key technical system for flexible processing of bulk oil protein with the characteristics of standardized production process, stable product quality, wide application field and precise special characteristics is established.
However, there is currently no method for producing soy protein isolate by monitoring core parameters during processing of oil by-product proteins using an in situ on-line monitoring technology system.
Disclosure of Invention
The invention aims to provide a method for regulating and controlling the quality of soybean protein isolate by utilizing an in-situ on-line monitoring technology system, so as to solve the problem that a method for producing the soybean protein isolate according to the in-situ on-line monitoring technology system by monitoring core parameters in the processing process of oil by-product proteins does not exist at present.
The technical scheme of the invention is as follows: a method for regulating and controlling the quality of soybean protein isolate by utilizing an in-situ on-line monitoring technology system is realized based on a protein isolation process system and a process engineering control system;
the protein separation process system comprises a primary extraction component 101, a primary extraction separation device 102, a secondary extraction component 103, a secondary extraction separation device 104, an acid precipitation component 105, a primary separation device 106, a water washing component 107, a neutralization component 108 and a secondary separation device 109; one output end of the first extraction component 101 is communicated with the input end of the first extraction separation device 102, the other output end of the first extraction component 101 is communicated with one input end of the primary separation device 106, one output end of the first extraction separation device 102 is communicated with the input end of the second extraction component 103, and the other output end of the first extraction separation device 102 is communicated with one input end of the acid precipitation component 105; the output end of the secondary extraction component 103 is communicated with the input end of the secondary extraction separation device 104, one output end of the secondary extraction separation device 104 is communicated with the other input end of the acid precipitation component 105, one output end of the acid precipitation component 105 is communicated with the other input end of the primary separation device 106, one output end of the primary separation device 106 is communicated with the input end of the water washing component 107, one output end of the water washing component 107 is communicated with the input end of the secondary separation device 109, and the output end of the secondary separation device 109 is communicated with the other output end of the water washing component 107 and the other input end of the neutralization component 108;
the process engineering control system comprises an ion intensity online detection device, a temperature online detection device, a pH online detection device, a protein concentration detection device, an online viscosity detection device, a programmable logic controller and a mechanical execution mechanism, wherein the online detection and regulation of parameters in situ are realized through an intelligent algorithm, and the method comprises the following steps:
1. starting a first extraction component 101 and feeding; the specific process is that a hot water pump 55 is started, corresponding control valve actions are completed according to a program for controlling the material-water ratio and the control temperature set in a programmable logic controller, after the material-water ratio is set, a first extraction tank 2 enters hot water, when the water enters the first extraction tank by 25%, a metering scale 67 starts to throw the white bean slice material into the first extraction tank, the first extraction tank is started to stir, a material level online detection system 4 detects and adjusts the flow of the hot water in real time, and a temperature online detection system 54 detects and adjusts the temperature of the hot water in real time;
2. extracting protein in a stripping assembly 101; the specific process is that an alkali pump 59 is started, corresponding control valve actions are completed according to the temperature set in a programmable logic controller and the program for controlling the pH value, in the process of adding alkali liquor, a pH online detection system 5 detects and adjusts the alkali liquor flow in real time, a temperature online detection system 73 detects and adjusts the steam flow in real time, the stirring frequency of a first extraction tank 3 is reduced, the hot water, the white bean slices and the alkali liquor flow are detected and adjusted by utilizing an in-situ online monitoring technology system, and the material level online detection system detects and adjusts the first extraction leaching liquor flow and the extraction time in real time;
3. operating the first extraction and separation device 102, automatically adjusting process parameters according to the setting in the programmable logic controller in the process, and realizing separation of bean dregs and protein liquid; the liquid level of the first extraction tank 2 reaches a limit value, a first extraction pump 7 is started, the first extraction separator 8 starts feeding, and a first extraction separator protein concentration detection system 9 automatically adjusts and opens a dilution water valve of the first extraction separator 8 according to a detection result and sets flow;
4. the secondary extraction component 103 is operated, the protein liquid separated by primary extraction is input into the secondary extraction component 103, the soluble protein is further extracted, the protein content and the yield of the product are improved, the concrete process is that the secondary extraction tank stirring 14, the mixed soybean milk tank stirring 18 and the hot water pump 55 are started, the corresponding valves are operated according to the setting in the programmable logic controller to add hot water into the secondary extraction tank 10, the material level online detection system 15 detects and adjusts the flow rate of the hot water in real time, the pH online detection system 11 detects and adjusts the flow rate of the alkaline liquid in real time in the process of adding the alkaline liquid, the liquid level of the secondary extraction tank 10 reaches a limit value, and the material level online detection system 12 detects and adjusts the flow rate and the extraction time of the secondary extraction leaching liquid in real time;
5. operating the secondary extraction separation device 104 to separate bean dregs from protein liquid; the specific process is that a secondary extraction pump 13 is started, a defoamer pump 69 is started, a secondary extraction separator 16 starts to feed, a secondary extraction separator protein concentration detection system 63 is started, a secondary extraction separator 16 dilution water valve is automatically opened and adjusted according to a detection result, and the flow is set;
6. operating an acid precipitation component 105, adjusting the pH value of the extracted protein liquid to reach the isoelectric point of the soybean protein, and coagulating and settling the soybean protein; the specific process is that the liquid level of the mixed soybean milk tank 17 reaches a limit value, a material level online detection system 19 detects and adjusts the liquid flow and the reaction time of the mixed soybean milk tank 17 in real time, a mixed soybean milk pump 20 and an acid precipitation tank are started to stir 24, mixed soybean milk is conveyed to an acid precipitation tank 23, an acid pump is started while the acid precipitation tank is fed for 20 percent, and in the process of adding alkaline acid, a pH online detection system detects and adjusts the flow 25 in real time, and a material level online detection system 26 detects and adjusts the liquid flow and the reaction time of the mixed soybean milk tank in real time;
7. operating a primary separation device 106, and separating 33 by an acid precipitation primary separator to obtain primary curd, so as to separate protein condensate from clear liquid; the concrete process is that after the acid precipitation time is reached, an acid precipitation tank material level online detection control system 26 is interlocked to start a curd conveying pump 27, a primary separator outlet online flow and pressure detection system 71 is used for detecting the amount of curd entering a washing tank 28, a primary separator protein concentration detection device 65 is started, a primary separator dilution water valve is automatically opened and adjusted according to the detection result, and the flow is set;
8. running the water wash assembly 107 to increase protein content and functionality; the specific process is that the stirring 29 of the water washing tank is started, when the material level of the water washing tank 28 reaches 15%, the material level control system 30 of the water washing tank is started according to the set value of the water-material ratio to enter hot water;
9. operating the secondary separation device 109 to achieve a secondary curd and a secondary whey; the specific process is that a protein concentration detection device 66 of the secondary separator is started, a dilution water valve of the secondary separator 35 is automatically adjusted and started according to the detection result, the flow rate is set, and a material level online detection system 31 detects in real time and adjusts the liquid outlet flow rate and the reaction time of a washing tank; when the secondary separator 35 starts to feed, the shredder 37 is started, the defoamer pump 70 is started, and the shredder pump 39 is started; heat exchange is carried out through the plate heat exchanger 42, and the temperature of the material after heat exchange is controlled by the temperature on-line detection system 43;
10. a neutralization component 108 is operated, alkali is added for neutralization, and the pH value is determined according to the product characteristics; the specific process is that an alkali pump is started, an automatic valve and a corresponding valve are set for adding alkali liquor for neutralization, a pH online detection system detects in real time and adjusts the flow, and the viscosity and the concentration of the feed liquor are measured online.
Compared with the prior art, the invention has the beneficial effects that:
the method of the soybean protein isolate quality in-situ on-line monitoring technical system is established on the basis of the production process of the traditional protein isolate 'alkali dissolution and acid precipitation', the protein quality in-situ on-line monitoring technical system is created, the system can be detected in real time by monitoring the core parameters including the change of processing core parameters such as protein concentration, temperature, pH, ionic strength, viscosity and the like in the processing process of the oil by-product protein, the production process system for producing the soybean protein isolate by the alkali dissolution and acid precipitation method can be better controlled according to the detection result, the requirements of on-line detection and regulation of the core parameters are effectively met, the processing of the temperature, pH, ionic strength, viscosity, concentration and the like in the processing process of the oil protein is regulated and controlled based on a PLC control combined intelligent algorithm, and the control of protein processing conditions and the accurate control of products with different functional qualities are realized.
Drawings
FIG. 1 is a schematic structure and a process flow chart of a device for producing soy protein isolate by an alkali-soluble acid precipitation method. Fig. 2 to 4 are schematic structural views of an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, a specific embodiment of the present invention will be described below with reference to fig. 1 to 4 and an example will be given. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The invention discloses a method for regulating and controlling the quality of soybean protein isolate by utilizing an in-situ on-line monitoring technology system, which is realized based on a protein isolation process system and a process engineering control system;
the protein separation process system comprises a primary extraction component 101, a primary extraction separation device 102, a secondary extraction component 103, a secondary extraction separation device 104, an acid precipitation component 105, a primary separation device 106, a water washing component 107, a neutralization component 108 and a secondary separation device 109; one output end of the first extraction component 101 is communicated with the input end of the first extraction separation device 102, the other output end of the first extraction component 101 is communicated with one input end of the primary separation device 106, one output end of the first extraction separation device 102 is communicated with the input end of the second extraction component 103, and the other output end of the first extraction separation device 102 is communicated with one input end of the acid precipitation component 105; the output end of the secondary extraction component 103 is communicated with the input end of the secondary extraction separation device 104, one output end of the secondary extraction separation device 104 is communicated with the other input end of the acid precipitation component 105, one output end of the acid precipitation component 105 is communicated with the other input end of the primary separation device 106, one output end of the primary separation device 106 is communicated with the input end of the water washing component 107, one output end of the water washing component 107 is communicated with the input end of the secondary separation device 109, and the output end of the secondary separation device 109 is communicated with the other output end of the water washing component 107 and the other input end of the neutralization component 108;
the process engineering control system comprises an ion intensity online detection device, a temperature online detection device, a pH online detection device, a protein concentration detection device, an online viscosity detection device, a programmable logic controller and a mechanical execution mechanism, wherein the parameter in-situ online detection and regulation are realized through an intelligent algorithm stored in the programmable logic controller, and the method comprises the following steps:
1. starting a first extraction component 101 and feeding; the specific process is that the hot water pump 55 is started, the corresponding control valve action is completed according to the program for controlling the material-water ratio and the control temperature set in the programmable logic controller, the first extraction tank 2 enters hot water after the material-water ratio is set, when the first extraction tank is filled with 25 percent of water, the metering scale 67 starts to throw the white bean slice material into the first extraction tank, the first extraction tank is started to stir, the material level online detection system 4 detects and adjusts the hot water flow in real time, and the temperature online detection system 54 detects and adjusts the hot water temperature in real time. The accurate control of the material-water ratio is to ensure the dissolution rate and extraction efficiency of the protein, reduce the loss of the protein, improve the yield of the finished product, and the accurate control of the temperature is to improve the solubility of the soybean protein, and simultaneously avoid the influence of the denaturation of the soybean protein on the functionality of the product due to high temperature, so that the high viscosity of the denaturation degree is increased, the separation is difficult, and the extraction energy consumption is also increased;
2. extracting protein in a stripping assembly 101; the specific process is that an alkali pump 59 is started, corresponding control valve actions are completed according to the temperature set in a programmable logic controller and the program for controlling the pH value, in the process of adding alkali liquor, a pH online detection system 5 detects and adjusts the alkali liquor flow in real time, a temperature online detection system 73 detects and regulates the steam flow in real time, the stirring frequency of a first extraction tank is reduced, a hot water, white bean slices and alkali liquor material flow are detected and regulated by an in-situ online monitoring technology system, the material level online detection system detects and regulates the first extraction liquid flow and the extraction time in real time, the accurate control of the pH is realized, on one hand, the dissolution rate of protein is ensured, the protein denaturation toxicity caused by pH deviation is avoided, and the addition amount of hydrochloric acid during acid precipitation is avoided, on the other hand, the pH can be adjusted according to different product characteristic requirements, and the protein functionality is adjusted;
3. operating the first extraction and separation device 102, automatically adjusting process parameters according to the setting in the programmable logic controller in the process, and realizing separation of bean dregs and protein liquid; the liquid level of the first extraction tank 2 reaches a limit value, a first extraction pump 7 is started, the first extraction separator 8 starts feeding, and a first extraction separator protein concentration detection system 9 automatically adjusts and opens a dilution water valve of the first extraction separator 8 according to a detection result and sets flow;
4. the secondary extraction assembly 103 is operated, the protein liquid separated by primary extraction is input into the secondary extraction assembly 103, the soluble protein is further extracted, the protein content and the yield of the product are improved, the secondary extraction tank stirring 14, the mixed soybean milk tank stirring 18 and the hot water pump 55 are started, the corresponding valves are operated according to the setting in the programmable logic controller to add hot water into the secondary extraction tank 10, the material level online detection system 15 detects and adjusts the flow rate of the hot water in real time, the pH online detection system 11 detects and adjusts the flow rate of the alkaline liquid in real time in the process of adding the alkaline liquid, the liquid level of the secondary extraction tank 10 reaches a limit value, the material level online detection system 12 detects and adjusts the flow rate and the extraction time of the secondary extraction liquid in real time, and the aim of avoiding excessive consumption of acid and alkali caused by inaccurate process parameter control is achieved, the yield of the protein is low, the extraction time mainly influences the protein dissolution rate, and the longer time is the higher the dissolution rate under certain conditions.
5. Operating the secondary extraction separation device 104 to separate bean dregs from protein liquid; the specific process is that the secondary extraction pump 13 is started, the defoamer pump 69 is started, the secondary extraction separator 16 starts to feed, the secondary extraction separator protein concentration detection system 63 is started, the secondary extraction separator 16 dilution water valve is automatically started and adjusted according to the detection result, the flow is set, and the secondary extraction separator 16 dilution water valve is adapted to various parameter changes of materials with different concentrations, so that the separation effect is ensured, the separation is also the key for improving the yield of the soybean protein isolate, and the secondary extraction separation is the separation of protein condensate and clear liquid.
6. Operating an acid precipitation component 105, adjusting the pH value of the extracted protein liquid to reach the isoelectric point of the soybean protein, and coagulating and settling the soybean protein; the specific process is that the liquid level of the mixed soybean milk tank 17 reaches a limit value, a material level online detection system 19 detects in real time and adjusts the liquid flow and the reaction time of the mixed soybean milk tank 17, a mixed soybean milk pump 20 and an acid precipitation tank are started to stir 24, mixed soybean milk is conveyed to an acid precipitation tank 23, the acid pump is started while the acid precipitation tank is fed for 20 percent, in the process of adding alkaline acid, a pH online detection system detects in real time and adjusts the flow 25, a material level online detection system 26 detects in real time and adjusts the liquid flow and the reaction time of the mixed soybean milk tank, in order to accurately control the required pH to reach an isoelectric point according to the product characteristics, isoelectric point deviation is the re-dissolution of protein to reduce the product yield, and if the added hydrochloric acid concentration is too large, protein denaturation can be caused.
7. Operating a primary separation device 106, and separating 33 by an acid precipitation primary separator to obtain primary curd, so as to separate protein condensate from clear liquid; the concrete process is that after the acid precipitation time is reached, an acid precipitation tank material level online detection control system 26 is interlocked to start a curd conveying pump 27, a primary separator outlet online flow and pressure detection system 71 is used for detecting the amount of curd entering a washing tank 28, a primary separator protein concentration detection device 65 is started, a primary separator dilution water valve is automatically opened and adjusted according to the detection result, and the flow is set;
8. running the water wash assembly 107 to increase protein content and functionality; the specific process is that the water washing tank is started to stir 29, when the material level of the water washing tank 28 reaches 15%, a water washing tank material level control system 30 is started to enter hot water according to a set value of a water material ratio, and the water washing is used for reducing residues of salt and oligosaccharide in protein, further separating protein curd from other carbohydrates and salt, and improving the protein content and the functionality.
9. Operating the secondary separation device 109 to achieve a secondary curd and a secondary whey; the specific process is that a protein concentration detection device 66 of the secondary separator is started, a dilution water valve of the secondary separator 35 is automatically adjusted and started according to the detection result, the flow rate is set, and a material level online detection system 31 detects in real time and adjusts the liquid outlet flow rate and the reaction time of a washing tank; when the secondary separator 35 starts to feed, the shredder 37 is started, the defoamer pump 70 is started, and the shredder pump 39 is started; heat exchange is carried out through the plate heat exchanger 42, and the temperature of the material after heat exchange is controlled by the temperature on-line detection system 43;
10. a neutralization component 108 is operated, alkali is added for neutralization, and the pH value is determined according to the product characteristics; the method comprises the steps of starting an alkali pump, setting an automatic and corresponding valve to add alkali liquor for neutralization, carrying out real-time detection by a pH online detection system, regulating flow, carrying out online measurement on the viscosity and concentration of the liquid, and better controlling the neutralization degree, wherein the higher pH provides enough OH ions to provide hydrogen bonds in a protein quaternary structure, so that the hydrogen bonds are opened, the quaternary structure is stretched, the stability of the protein in water is further improved, the direct appearance phenomenon is that the neutralization viscosity is increased, a neutralization tank is started to stir, the neutralization tank is entered, the neutralization process is also one step of adjusting the functionality of the protein, the pH value of the slurry is accurately controlled to meet different requirements on the functionality of a soybean protein isolate product, if the OH ion amount is continuously increased, the comprehensive development water holding capacity of the protein is enhanced, the organization structure rule of gel is high in strength, but if the pH exceeds a certain value, the developed protein is hydrolyzed and aminoacylated under the action of strong alkali, and harmful substances are formed; the protein concentration of the feed liquid is measured on line, and because the protein concentration affects the density of the protein, the protein concentration is high, the solid content is high, the water content in liquid drops formed by spray drying is low, and the protein powder particles formed during spray drying are small in hollowness and high in density.
In the above steps, specific parameters of each step are as follows:
(1) Starting a hot water pump, setting automatic and corresponding valves, setting a material-water ratio of 1:6-1:8 m/V, enabling a first extraction tank to enter hot water, enabling a metering scale to start throwing white bean flake materials into the first extraction tank when the hot water temperature is 50+/-1 ℃ and the water inlet of the first extraction tank is 25%, starting stirring of the first extraction tank, enabling a stirring frequency of the first extraction tank to be 60-80rpm, enabling a flow and material level online detection system to detect and adjust the hot water flow in real time, enabling a temperature online detection system to detect and regulate the hot water temperature in real time, and realizing accurate control of the material ratio and the hot water temperature;
(2) Starting an alkali pump, setting an automatic valve and a corresponding valve, adding an alkali solution, detecting and regulating the alkali solution flow in real time by a pH online detection system, detecting and regulating the pH value of primary extraction to 7.1+/-0.1, detecting and regulating the steam flow in real time by a temperature online detection system, reducing the stirring frequency of primary extraction tank to 20-40 rpm at the temperature of primary extraction tank to 50+/-1 ℃, detecting and regulating the hot water, white bean slices and alkali solution material flow by an in-situ online monitoring technology system, and realizing the accurate control of pH and reaction temperature;
(3) When the liquid level of the first extraction tank reaches 50% -70% of a limit value, a first extraction pump is started, a first extraction separator starts feeding, a protein concentration detection device of the first extraction separator automatically adjusts and opens a dilution water valve of the first extraction separator according to a detection result and sets a flow, and a material level online detection system detects in real time and adjusts the flow and the reaction time of the first extraction leaching solution;
(4) Starting a secondary extraction tank for stirring, a mixed soybean milk tank for stirring, a hot water pump and setting an automatic and corresponding valve to add hot water into the secondary extraction tank, wherein the secondary extraction water ratio is 1:4-1:6 m/V, the stirring frequency of the secondary extraction tank is 20-40 rpm, the stirring frequency of the mixed soybean milk tank is 20-40 rpm, and a flow and material level online detection system detects and adjusts the flow of the hot water in real time, and the temperature of the secondary extraction tank is 50+/-1 ℃;
(5) In the process of adding alkali liquor, a pH online detection system detects in real time and adjusts the flow rate of the alkali liquor, the pH value of the secondary extraction tank is 6.8+/-0.1, the liquid level of the secondary extraction tank reaches a limit value (set according to the requirement of reaction time), the liquid level of the secondary extraction tank is 70% -90%, the material level online detection system detects in real time and adjusts the flow rate and the reaction time of primary extraction lixivium, a secondary extraction pump is started, a defoamer pump B is started, a secondary extraction separator starts to feed, a protein concentration detection device of the secondary extraction separator is started, a dilution water valve of the secondary extraction separator is automatically started and adjusted according to the detection result, and the flow rate is set;
(6) The liquid level of the mixed soybean milk tank reaches a limit value, the liquid level of the mixed soybean milk tank reaches 50% -60%, the pH value of the mixed soybean milk is 6.8-7.2, a material level online detection system detects and adjusts the liquid flow rate and the reaction time of the mixed soybean milk tank, a mixed soybean milk pump and an acid precipitation tank are started to stir, the stirring frequency of the acid precipitation tank is 70-80 rpm, the stirring frequency of the acid precipitation tank is adjusted to 20-30 rpm, the mixed soybean milk is conveyed to the acid precipitation tank, the acid pump is started while the feeding of the acid precipitation tank is 20%, the pH value of the acid precipitation tank is 4.45+/-0.05, the pH online detection system detects and adjusts the liquid flow rate and the reaction time of the mixed soybean milk tank, and the liquid level of the acid precipitation tank is 70% -90%;
(7) After the acid precipitation time is reached, a material level online detection control device of an acid precipitation tank is interlocked to start a curd conveying pump, curd slurry is separated by an acid precipitation primary separator to obtain primary curd, the dilution water quantity of the curd is regulated according to the acid precipitation effect and the concentration of neutralization liquid, an online flow and pressure detection device of an outlet of the primary separator is used for detecting the quantity of the curd entering a washing tank, a protein concentration detection device of the primary separator is started, a dilution water valve of the primary separator is automatically started and regulated according to the detection result, and the flow is set, so that the efficient separation of protein condensate and clear liquid is realized;
(8) Starting a washing tank for stirring, wherein the stirring frequency of the washing tank is 50-60 rpm, when the material level of the washing tank reaches 15%, starting a material level control system of the washing tank to enter hot water according to a water-material ratio at a set value, performing secondary separation on primary curd after washing, starting a protein concentration detection device of a secondary separator, automatically adjusting and starting a dilution water valve of the secondary separator according to a detection result, setting a flow, and performing real-time detection by a material level online detection system, and adjusting the liquid outlet flow and the reaction time of the washing tank, wherein the liquid level of the washing tank is 70-90%;
(9) Starting a breaking machine (the liquid level is set to 40% -60% in order to completely dissolve particles formed by curdlan breaking) after the secondary separator starts feeding, starting a defoamer pump C, and starting a breaking pump; heat exchange is carried out through a plate heat exchanger, the temperature of the material after heat exchange is controlled by a temperature on-line detection device, and the temperature of the material after heat exchange is 15-18 ℃;
(10) Starting an alkali pump, setting an automatic valve and a corresponding valve, adding alkali liquor for neutralization, detecting and adjusting the flow in real time by a pH online detection system, wherein the alkali liquor is NaOH solution with the mass concentration of 30-32%, the pH value is 7.1+/-0.1, adding hot water, starting a neutralization tank for stirring, the stirring frequency is 75-85 rpm, the stirring frequency is 20-30 rpm after the neutralization is completed, detecting and adjusting the liquid outlet flow and the reaction time of the neutralization tank by a material level online detection system, and the liquid level of the neutralization tank is 70-90%.
Example 1
Starting a hot water pump and setting automatic and corresponding valves, setting a first extraction tank to enter hot water flow, starting a first extraction tank for stirring, starting a metering balance discharge valve for starting feeding when the first extraction tank 2 is started for 25 percent of water, controlling the liquid level of the first extraction tank to ensure that water is fed after the water is fed, controlling the water ratio of the first extraction tank to be 1:8, setting an alkali pump and an automatic and corresponding valve and a defoamer pump A at 50 ℃, detecting and adjusting the flow in real time by a pH online detection system in the alkaline solution feeding process, wherein the pH value of the first extraction tank is 7.1+/-0.1, the stirring of the first extraction tank is reduced to 40rpm at a low speed, starting the first extraction pump for feeding when the liquid level of the first extraction tank reaches 50 percent, starting the second extraction tank for stirring, mixing soybean milk tank for stirring, and the hot water pump, setting the automatic and corresponding valves to be the second extraction tank for feeding hot water, setting the liquid level of the second extraction tank to be 70 percent, and the water ratio of the second extraction tank to be 1:5, the pH value of the secondary extraction is 6.8+/-0.1, the secondary extraction temperature is 50 ℃, a secondary extraction pump is started, a defoamer pump B is started, a secondary extraction separator starts to feed, the liquid level of a mixed soybean milk tank reaches 50%, a mixed soybean milk pump and an acid precipitation tank are started to stir, mixed soybean milk is conveyed to the acid precipitation tank, the acid pump is started while feeding 20% of the acid precipitation tank, in the process of adding alkaline acid, a pH online detection system detects and adjusts the flow, the pH value of the acid precipitation mixed soybean milk is 6.8-7.2, the temperature is 45 ℃, the pH value of the acid precipitation is 4.45+/-0.05, the stirring speed is 80rpm, the adjustment is 20rpm, the content of curd solids is more than 35%, after the acid precipitation time is reached, an online detection control device for the material level of the acid precipitation tank is interlocked to start the curd conveying pump, the primary separator starts to feed, the curd dilution water amount is adjusted according to the acid precipitation effect and the concentration of the neutralization liquid, the water washing tank is started to stir, and the material level of the water washing tank reaches 15%, according to the water-material ratio, a material level control system of a washing tank is started to enter hot water at a set value of 2:1, an online flow and pressure detection device at an outlet of a primary separator is used for detecting the amount of curd entering the washing tank, curd slurry is separated by an acid precipitation primary separator to obtain primary curd, the primary curd is subjected to water washing and then secondary separation, namely, the protein curd is further separated from other carbohydrates and salt to obtain protein secondary curd, after the secondary separator starts to feed, a breaking machine (the liquid level is set to 40 percent for breaking the curd to form particles through complete dissolution) is started, a feeding valve of a neutralizing tank is started, a defoaming agent pump C is started, a breaking pump is started, heat exchange is carried out through a plate heat exchanger, a temperature online detection device is used for controlling the temperature of the material after heat exchange, the material temperature entering the neutralizing tank is set to 15 ℃, an alkali pump is started and an automatic and corresponding valve is set to be added with a 20 percent sodium hydroxide pump for neutralization, the pH online detection system is used for carrying out real-time detection and flow adjustment, the pH value is 7.1+/-0.1, the viscosity and the concentration of the material liquid are measured, the stirring frequency is 85rpm, the stirring frequency is 30rpm after neutralization is completed, the gel is controlled according to a finished index, the neutralization concentration is controlled, and the solid dispersion quality is controlled to be more than 13%. The solid content of the soybean milk is 0.25-0.3me/10me, the solid content of the soybean milk is less than 0.1-0.18me/10me, the mixed soybean milk is 0.25-0.3me/10me, the mixed soybean milk solid content is 5% -5.5%, the water content of the bean dregs is 83% +/-1%, the curd solid content is more than 35%, the solid content in the bean whey is less than 0.01ml/10ml, and the milk content in the bean whey is less than 0.01me/10 me.
The product index is as follows: color and luster, milky white; appearance, loose powder, no caking, no coke powder; the flavor and the smell have the flavor and the smell of the protein powder; impurities, no macroscopic impurities; physicochemical detection, wherein the water content is less than or equal to 7.0 percent, the crude protein is less than or equal to 90 percent, the crude fat is less than or equal to 1.0 percent, and the crude fiber is less than or equal to 0.3 percent; ash content is less than or equal to 6.0, and gel value g/cm < 2 > is more than or equal to 16; the nitrogen dissolution index percent is more than or equal to 85; the pH value is 7.0 plus or minus 0.5; particle size, 90% passed through a 100 mesh standard sieve.
The above embodiments are only illustrative of the present patent and do not limit the protection scope thereof, and those skilled in the art can also change the parts thereof, which are within the protection scope of the present patent without exceeding the spirit of the present patent.
Claims (10)
1. A method for regulating and controlling the quality of soybean protein isolate by utilizing an in-situ on-line monitoring technology system is realized based on a protein isolation process system and a process engineering control system;
the protein separation process system comprises a primary extraction component (101), a primary extraction separation device (102), a secondary extraction component (103), a secondary extraction separation device (104), an acid precipitation component (105), a primary separation device (106), a water washing component (107), a neutralization component (108) and a secondary separation device (109); one output end of the first extraction component (101) is communicated with the input end of the first extraction separation device (102), the other output end of the first extraction component (101) is communicated with one input end of the primary separation device (106), one output end of the first extraction separation device (102) is communicated with the input end of the second extraction component (103), and the other output end of the first extraction separation device (102) is communicated with one input end of the acid precipitation component (105); the output end of the secondary extraction component (103) is communicated with the input end of the secondary extraction separation device (104), one output end of the secondary extraction separation device (104) is communicated with the other input end of the acid precipitation component (105), one output end of the acid precipitation component (105) is communicated with the other input end of the primary separation device (106), one output end of the primary separation device (106) is communicated with the input end of the washing component (107), one output end of the washing component (107) is communicated with the input end of the secondary separation device (109), and the output end of the secondary separation device (109) is communicated with the other output end of the washing component (107) and the other input end of the neutralization component (108);
the method is characterized in that: the process engineering control system comprises an ion intensity online detection device, a temperature online detection device, a pH online detection device, a protein concentration detection device, an online viscosity detection device, a programmable logic controller and a mechanical execution mechanism, wherein the online detection and regulation of parameters in situ are realized through an intelligent algorithm, and the method comprises the following steps:
1. starting a first extraction component (101) and feeding; the specific process is that a hot water pump (55) is started, corresponding control valve actions are completed according to a program for controlling the material-water ratio and the control temperature set in a programmable logic controller, after the material-water ratio is set, a first extraction tank (2) enters hot water, when the first extraction tank is filled with 25 percent of water, a metering scale (67) starts to throw the white bean slice material into the first extraction tank, the first extraction tank is started to stir, a material level online detection system (4) detects and adjusts the flow of the hot water in real time, and a temperature online detection system (54) detects and adjusts the temperature of the hot water in real time;
2. extracting proteins in an extraction module (101); the method comprises the specific processes of starting an alkali pump (59) and completing corresponding controlled valve actions according to the temperature set in a programmable logic controller and a program for controlling and controlling the pH value, wherein in the process of adding alkali liquor, a pH online detection system (5) detects and adjusts the alkali liquor flow in real time, a temperature online detection system (73) detects and regulates the steam flow in real time, the frequency of stirring (3) of a first extraction tank is reduced, an in-situ online monitoring technology system is utilized to detect and regulate the flow of hot water, white bean slices and alkali liquor materials, and a material level online detection system detects and adjusts the flow of the first extraction leaching liquor and the extraction time in real time;
3. operating a first extraction separation device (102), and automatically adjusting technological parameters according to the setting in a programmable logic controller in the process to realize separation of bean dregs and protein liquid; the liquid level of the first extraction tank (2) reaches a limit value, a first extraction pump (7) is started, the first extraction separator (8) starts to feed, and a first extraction separator protein concentration detection system (9) automatically adjusts and opens a dilution water valve of the first extraction separator (8) according to a detection result and sets flow;
4. the secondary extraction component (103) is operated, the protein liquid separated by primary extraction is input into the secondary extraction component (103), the soluble protein is further extracted, the protein content and the yield of the product are improved, the specific process is that a secondary extraction tank stirring (14), a mixed soybean milk tank stirring (18) and a hot water pump (55) are started, corresponding valves are operated according to setting settings in a programmable logic controller to add hot water into the secondary extraction tank (10), a material level online detection system (15) detects and adjusts the flow of the hot water in real time, a pH online detection system (11) detects and adjusts the flow of the alkaline liquid in real time in the process of adding the alkaline liquid, the liquid level of the secondary extraction tank (10) reaches a limit value, and a material level online detection system (12) detects and adjusts the flow of the secondary extraction leaching liquid and the extraction time in real time;
5. operating a secondary extraction separation device (104) to separate bean dregs from protein liquid; the specific process is that a secondary extraction pump (13) is started, a defoamer pump (69) is started, a secondary extraction separator (16) starts feeding, a secondary extraction separator protein concentration detection system (63) is started, a secondary extraction separator (16) dilution water valve is automatically started and adjusted according to a detection result, and the flow is set;
6. operating an acid precipitation component (105), adjusting the pH value of the extracted protein liquid to reach the isoelectric point of the soybean protein, and coagulating and settling the soybean protein; the method comprises the specific processes that the liquid level of a mixed soybean milk tank (17) reaches a limit value, a material level online detection system (19) detects and adjusts the liquid flow and the reaction time of the mixed soybean milk tank (17) in real time, a mixed soybean milk pump (20) and an acid precipitation tank are started to stir (24), mixed soybean milk is conveyed to the acid precipitation tank (23), the acid precipitation tank is started while feeding 20% of acid, in the process of adding alkaline acid, a pH online detection system detects and adjusts the flow (25) in real time, and a material level online detection system (26) detects and adjusts the liquid flow and the reaction time of the mixed soybean milk tank in real time;
7. operating a primary separation device (106), and separating (33) by an acid precipitation primary separator to obtain primary curd, so as to separate protein condensate from clear liquid; the concrete process is that after the acid precipitation time is reached, an acid precipitation tank material level online detection control system (26) is interlocked to start a curd conveying pump (27), a primary separator outlet online flow and pressure detection system (71) is used for detecting the amount of curd entering a washing tank (28), a primary separator protein concentration detection device (65) is started, a primary separator dilution water valve is automatically started and adjusted according to the detection result, and the flow is set;
8. operating the operating water wash assembly (107) to increase protein content and functionality; the concrete process is that a water washing tank stirring (29) is started, when the material level of a water washing tank (28) reaches 15%, a water washing tank material level control system (30) is started according to a set value of a water material ratio to enter hot water;
9. operating a secondary separation device (109) to achieve a secondary curd and a secondary whey; the specific process is that a protein concentration detection device (66) of the secondary separator is started, a dilution water valve of the secondary separator (35) is automatically adjusted and started according to a detection result, the flow is set, and a material level online detection system (31) detects in real time and adjusts the liquid outlet flow and the reaction time of a washing tank; starting a breaking machine (37), starting a defoamer pump (70) and starting a breaking pump (39) after the secondary separator (35) starts feeding; heat exchange is carried out through a plate heat exchanger (42), and a temperature on-line detection system (43) controls the temperature of the material after heat exchange;
10. a neutralization component (108) is operated, alkali is added for neutralization, and the pH value is determined according to the product characteristics; the specific process is that an alkali pump is started, an automatic valve and a corresponding valve are set for adding alkali liquor for neutralization, a pH online detection system detects in real time and adjusts the flow, and the viscosity and the concentration of the feed liquor are measured online.
2. The method for regulating and controlling the quality of soy protein isolate by using an in-situ on-line monitoring technology system according to claim 1, wherein the method comprises the following steps: in the first step, after the water ratio of the materials is set to be 1:6-1:8 m/V, the first extraction tank is filled with hot water, the temperature of the hot water is 50+/-1 ℃, when the first extraction tank is filled with 25% of water, the metering scale starts to throw the white bean slice materials into the first extraction tank, the first extraction tank is started to stir, and the stirring frequency of the first extraction tank is 60-80rpm.
3. The method for regulating and controlling the quality of soy protein isolate by using an in-situ on-line monitoring technology system according to claim 1, wherein the method comprises the following steps: in the second step, the alkali liquor is NaOH solution with the mass concentration of 30-32%, the pH value of the first extraction is 7.1+/-0.1, the temperature of the first extraction tank is 50+/-1 ℃, and the stirring frequency of the first extraction tank is 20-40 rpm.
4. The method for regulating and controlling the quality of soy protein isolate by using an in-situ on-line monitoring technology system according to claim 1, wherein the method comprises the following steps: when the liquid level of the primary extraction tank reaches 50% -70% of the limit value, the primary extraction separator starts feeding.
5. The method for regulating and controlling the quality of soy protein isolate by using an in-situ on-line monitoring technology system according to claim 1, wherein the method comprises the following steps: the water ratio of the secondary extraction materials is 1:4-1:6 m/V, the stirring frequency of the secondary extraction tank is 20-40 rpm, the stirring frequency of the mixed soybean milk tank is 20-40 rpm, and the temperature of the secondary extraction tank is 50+/-1 ℃.
6. The method for regulating and controlling the quality of soy protein isolate by using an in-situ on-line monitoring technology system according to claim 1, wherein the method comprises the following steps: the pH value of the secondary extraction is 6.8+/-0.1, the liquid level of the secondary extraction tank reaches a limit value (set according to the requirement of the reaction time), and the liquid level of the secondary extraction tank is 70% -90%.
7. The method for regulating and controlling the quality of soy protein isolate by using an in-situ on-line monitoring technology system according to claim 1, wherein the method comprises the following steps: the liquid level of the mixed soybean milk tank is 50-60%, the pH value of the mixed soybean milk is 6.8-7.2, the stirring frequency of the acid precipitation tank is 70-80 rpm, the stirring frequency is adjusted to 20-30 rpm, the pH value of the acid precipitation tank is 4.45+/-0.05, and the liquid level of the acid precipitation tank is 70-90%.
8. The method for regulating and controlling the quality of soy protein isolate by using an in-situ on-line monitoring technology system according to claim 1, wherein the method comprises the following steps: when the stirring frequency of the water washing tank is 50-60 rpm and the material level of the water washing tank reaches 15%, a material level control system of the water washing tank is started at a set value according to the water-material ratio to enter hot water, the water-material ratio is 4:1-2:1, and the liquid level of the water washing tank is 70% -90%.
9. The method for regulating and controlling the quality of soy protein isolate by using an in-situ on-line monitoring technology system according to claim 1, wherein the method comprises the following steps: starting the liquid level setting of the shredder to 40-60%, and after heat exchange, the temperature of the material is 15-18 ℃.
10. The method for regulating and controlling the quality of soy protein isolate by using an in-situ on-line monitoring technology system according to claim 1, wherein the method comprises the following steps: the alkali liquor is NaOH solution with the mass concentration of 30-32%, the pH value is 7.1+/-0.1, the stirring frequency is 75-85 rpm, the stirring frequency is 20-30 rpm after neutralization is completed, and the liquid level of the neutralization tank is 70-90%.
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