A subcritical continuous protein hydrolysis system

Abstract

This invention discloses a subcritical continuous hydrolysis system for proteins, primarily relating to the field of protein processing equipment. It includes a raw material storage tank, a high-temperature pressure reactor, and a product storage tank, sequentially connected by pipelines. The high-temperature pressure reactor is externally equipped with a temperature control jacket, and internally contains a stirring paddle. A discharge valve with pressure monitoring is installed at the top of the reactor; the discharge valve opens when the pressure exceeds a threshold. The discharge valve is connected to a discharge pipeline, which includes one or more heat exchangers. One or more preheaters are located between the raw material storage tank and the high-temperature pressure reactor, and a closed circulation pipeline connects at least one preheater and at least one heat exchanger. The advantages of this invention are: achieving efficient and continuous high-temperature, high-pressure hydrolysis of proteins, improving production efficiency and product uniformity, and significantly reducing production energy consumption.

Description

Technical Field

[0001] This invention relates to the field of protein processing equipment, specifically a subcritical continuous hydrolysis system for proteins. Background Technology

[0002] Protein hydrolysates are widely used in food additives, pharmaceutical intermediates, feed ingredients, and biochemical raw materials due to their easy absorption and strong functionality. With the continuous expansion of market demand, the requirements for large-scale, continuous, efficient, and energy-saving protein hydrolysis processes are increasing.

[0003] Traditional protein hydrolysis processes often employ batch reactors, primarily operating at atmospheric or low pressure. This approach suffers from the following technical drawbacks: 1) Batch operation is cumbersome, resulting in low production efficiency. Furthermore, it's difficult to maintain consistent reaction conditions across different batches, leading to inconsistent composition, purity, and molecular weight distribution of the hydrolysates, impacting product quality. 2) Low reaction temperatures result in slow hydrolysis rates and low raw material conversion rates, leading to raw material waste. 3) The lack of dedicated heat recovery design means that products from high-temperature reactions are directly cooled by cooling water, causing direct heat loss. Meanwhile, the feed material is at room temperature, requiring the reactor to continuously consume significant energy to heat it, resulting in low energy utilization, high production energy consumption, and increased industrial production costs.

[0004] In the prior art, some studies have attempted to apply high temperature and high pressure technology to protein hydrolysis processes to improve hydrolysis efficiency. For example, Chinese patent CN111493206A discloses a rapid dissolution device and method for protein compositions, which realizes continuous feeding of raw materials and continuous discharge of products. However, this device uses atmospheric pressure reaction, resulting in low hydrolysis efficiency. Moreover, its heat recovery structure is a direct heat exchange, which easily leads to cross-contamination between raw materials and products, resulting in low heat exchange efficiency and making it impossible to achieve cascade recovery and closed-loop utilization of waste heat.

[0005] In summary, existing protein hydrolysis devices suffer from technical problems such as low continuity, poor hydrolysis efficiency, insufficient product uniformity, low energy utilization, and susceptibility to cross-contamination, resulting in long-standing technical defects in equipment and processes. Summary of the Invention

[0006] The purpose of this invention is to provide a subcritical continuous hydrolysis system for proteins, which enables efficient and continuous high-temperature and high-pressure hydrolysis of proteins, improves production efficiency and product uniformity, and significantly reduces production energy consumption.

[0007] To achieve the above objectives, the present invention employs the following technical solution: A subcritical continuous hydrolysis system for proteins includes a raw material storage tank, a high-temperature pressure reactor, and a product storage tank, which are sequentially connected by pipelines. The high-temperature pressure reactor is equipped with a temperature control jacket on its exterior and a stirring paddle installed inside. A discharge valve with pressure monitoring is installed on the top of the high-temperature pressure reactor. The discharge valve opens when the pressure exceeds a threshold. The discharge valve is connected to a discharge pipeline, which includes one or more heat exchangers. One or more preheaters are located between the raw material storage tank and the high-temperature pressure reactor. A closed circulation pipeline is provided between at least one preheater and at least one heat exchanger.

[0008] The raw material storage tank is made of 304 stainless steel and is equipped with a low-speed agitator of 15 r / min and an electromagnetic metering feed pump with a feeding rate of 0.5-5 m³ / h.

[0009] It also includes a feed pipeline for connecting the raw material storage tank and the high-temperature pressure reactor for feeding. The preheater is installed on the feed pipeline, and a pressure delivery pump is configured on the feed pipeline.

[0010] The feed pipeline, high-temperature pressure reactor, and product discharge pipeline are all wrapped with an asbestos insulation layer with a thickness of 50-80mm.

[0011] The high-temperature pressure reactor has a volume of 2 m³, the raw material storage tank has a volume of 15 m³, the product storage tank has a volume of 20 m³, each heat exchanger has a heat exchange area of ​​10 m², and each preheater has a heat exchange area of ​​10 m².

[0012] The preheater includes a first preheater and a second preheater connected in series according to the material conveying direction. There is one heat exchanger. A circulation pipeline is provided between the heat exchanger and the first preheater. The circulation pipeline contains heat transfer oil and the heat transfer oil circulates in a closed loop between the first preheater and the heat exchanger.

[0013] The temperature of the material after preheating in the first preheater is 80-150℃, and the temperature of the material after preheating in the second preheater is 200℃.

[0014] The circulation pipeline is equipped with a variable frequency circulation pump and a platinum resistance temperature sensor. The variable frequency circulation pump is used to drive the heat transfer oil to circulate in a closed loop between the first preheater and the heat exchanger. The heat transfer oil used is L-QB300 type heat transfer oil.

[0015] The high-temperature pressure reactor is designed to operate at a temperature of 200℃ and a pressure of 2.0MPa; the discharge valve is designed to operate at a pressure threshold of 2.0MPa; and the stirring paddle inside the high-temperature pressure reactor rotates at a speed of 30-60 r / min.

[0016] The high-temperature pressure reactor is also equipped with a 2.5MPa safety valve.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This system centers on a high-temperature, high-pressure reactor customized for the characteristics of protein hydrolysate materials. It integrates continuous quantitative feeding, precise temperature and pressure control, and continuous cooling discharge into a single design. Furthermore, it incorporates a closed-loop heat recovery circulation system using heat transfer oil to achieve efficient, continuous high-temperature, high-pressure hydrolysis of proteins, improving production efficiency and product uniformity. Simultaneously, by using heat transfer oil as an indirect heat transfer medium, it enables the cascaded recovery and closed-loop reuse of waste heat from the high-temperature product cooling process, significantly reducing energy consumption and preventing cross-contamination between raw materials and products. In addition, a PLC control terminal enables automated and coordinated control of the entire process, enhancing the ease of operation and stability of the equipment, and adapting it to the needs of industrial-scale protein hydrolysis production. Attached Figure Description

[0018] Appendix Figure 1 This is a system schematic diagram of the present invention.

[0019] The labels shown in the attached diagram: 1. Feed pipeline; 2. First preheater; 3. Second preheater; 4. High-temperature pressure reactor; 5. Temperature control jacket; 6. Discharge pipeline; 7. Heat exchanger; 8. Circulation pipeline; 9. Asbestos insulation layer.

[0020] The chemical symbols used in the diagram correspond to general chemical process symbols, including: Pipeline designation – Material designation + Number – Pipe diameter – Pipe material – Insulation designation Material transfer: PL—Process material, OR—Heat transfer oil Instrumentation: TE – Temperature measuring instrument, PE – Pressure measuring instrument Valve designations: BF – Back pressure valve, QF – Ball valve, ZF – Gate valve Level gauge code: LLT - Magnetic flip plate. Detailed Implementation

[0021] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0022] Unless otherwise specified, the instruments, reagents, and materials used in the following embodiments are all conventional instruments, reagents, and materials already available in the prior art and can be obtained through legitimate commercial channels. Unless otherwise specified, the experimental methods and detection methods used in the following embodiments are all conventional experimental methods and detection methods already available in the prior art.

[0023] The main body of this invention is a protein subcritical continuous hydrolysis system. The system specifically includes a raw material feeding unit, a high-temperature pressure reactor (4 core units), a product discharge unit, and a heat transfer oil closed-loop heat recovery circulation unit. Each unit is connected by 316 stainless steel pipelines to form a continuous protein hydrolysis process flow and a closed heat recovery loop. All power and control components are electrically connected to a PLC control terminal to realize automated and coordinated control of the entire hydrolysis process and heat recovery process.

[0024] 1. Raw material feeding unit The raw material feeding unit includes a raw material storage tank, a low-speed agitator, an electromagnetic metering feed pump, and a feed pipeline 1.

[0025] The raw material storage tank is a 15m³ 304 stainless steel tank used to store the protein raw material liquid to be hydrolyzed; the low-speed stirrer is installed in the raw material storage tank, with a stirring speed of 10-20r / min, to prevent protein raw material precipitation and ensure the uniformity of the mixture composition; the electromagnetic metering feed pump is installed on the feed pipeline 1, with a feed rate adjustment range of 0.5-5m³ / h, which can precisely control the feed rate and achieve continuous quantitative feeding; A preheater belonging to the closed-loop heat recovery circulation unit of the heat transfer oil is also provided on the feed pipeline 1. The preheater is a shell-and-tube preheater with a heat exchange area of ​​10㎡. There are two preheaters connected in series on the feed pipeline 1 according to the material connection sequence. For ease of description, the two preheaters are defined as the first preheater 2 and the second preheater 3. The first preheater 2 preheats the protein raw material liquid to be hydrolyzed to 80-150℃, and then the second preheater 3 heats it to 200℃ before it is continuously and quantitatively fed into the high-temperature pressure reactor 4, thereby reducing the heating energy consumption of the reactor.

[0026] The core unit of the high-temperature pressure reactor 4 is a 2m³ high-temperature pressure reactor 4 customized for the characteristics of protein hydrolysate materials. It is the core of the hydrolysis reaction of this invention. The reactor is designed to operate at a temperature of 200℃ and a pressure of 2.0MPa. A temperature control jacket 5 is installed on the outside of the reactor. The jacket is filled with heat transfer oil and, together with a high-precision temperature sensor, enables precise control of the internal temperature of the reactor with a control error of ±1℃. The top of the reactor is equipped with a discharge valve with pressure monitoring, including a high-precision pressure sensor and a spring-loaded discharge valve. The pressure sensor monitors the internal pressure of the reactor in real time, and the discharge valve automatically opens when the pressure exceeds the set value of 2.0 MPa. The reactor is also equipped with a 2.5MPa safety valve, which automatically opens to release pressure when the pressure exceeds 2.5MPa, ensuring the safety of the reaction. The reactor is equipped with a spiral agitator with a stirring speed of 30-60 r / min, which is adapted to the viscosity characteristics of the protein solution, so as to achieve thorough mixing of raw materials and subcritical water, thereby improving hydrolysis efficiency and product uniformity.

[0027] 3. Product discharge unit The product discharge unit includes a discharge pipeline 6 and a product storage tank.

[0028] The discharge pipeline 6 is connected to the discharge valve of the core unit of the high-temperature pressure reactor 4, and sequentially connects the first heat exchanger 7 and the product storage tank to achieve material communication.

[0029] The product storage tank is a 20m³ 304 stainless steel tank. The cooled hydrolysis products enter the product storage tank through the discharge pipe 6 for collection. The product storage tank is equipped with a liquid level sensor to realize automatic monitoring and early warning of the liquid level, which facilitates timely collection and transfer of products.

[0030] A heat exchanger 7, belonging to the closed-loop heat recovery circulation unit of the thermal oil, is also installed on the discharge pipeline 6. The heat exchanger 7 is a shell-and-tube type with a heat exchange area of ​​10 m², used to cool the high-temperature hydrolysis products, rapidly cooling the product temperature from 200°C to room temperature. Simultaneously, an emergency discharge port, parallel to and connected to the heat exchanger 7, is also connected to the discharge pipeline 6. Figure 1 As shown, during normal operation of the system, the material passes through the heat exchanger 7 and flows out from the material outlet 1. In case of emergency or when the heat exchanger 7 needs maintenance, the material can be discharged directly from the emergency outlet and collected through the material outlet 2.

[0031] 4. Closed-loop heat recovery circulation unit for heat transfer oil The heat transfer oil closed-loop heat recovery circulation unit includes the first preheater 2 and the second preheater 3 installed in the raw material feeding unit, as well as the heat exchanger 7 installed on the discharge pipeline 6; it consists of a circulation pipeline 8 that connects the pipelines, a variable frequency circulation pump, and a platinum resistance temperature sensor, forming a closed-loop heat recovery system.

[0032] The circulation pipeline 8 is used to connect and supply heat transfer oil to the first preheater 2 and / or the second preheater 3 and the heat exchanger 7. In this design, in order to take into account both heat circulation and system reaction needs, the circulation pipeline 8 is only used to connect to the first preheater 2 to provide circulating heat. The second heat exchanger 3 still receives heat from the external heat transfer oil because it is necessary to heat the material to a higher temperature.

[0033] The variable frequency circulating pump provides power for the circulation of heat transfer oil and can adjust the circulation flow rate in real time according to the temperature of the heat transfer oil. The platinum resistance temperature sensor is a high-precision temperature monitoring device with a monitoring accuracy of ±0.5℃, and it provides real-time feedback of the heat transfer oil temperature to the PLC control terminal. When the high-temperature hydrolysis products flow through heat exchanger 7, they transfer heat to the heat transfer oil. The heated heat transfer oil (temperature rises to 100-180℃) is driven by a variable frequency circulating pump and flows into the preheater through the heat transfer oil circulation pipeline 8 to preheat the hydrolysate in the feed pipeline 1. After the heat transfer oil releases heat and its temperature decreases, it flows back to heat exchanger 7, completing the cascade recovery and closed-loop reuse of waste heat. Using heat transfer oil as an indirect heat transfer medium effectively avoids cross-contamination between raw materials and products and improves heat exchange efficiency.

[0034] In the above equipment, the raw material feed pipe 1, the high-temperature pressure reactor 4, and the product discharge pipe 6 are all wrapped with an asbestos insulation layer 9 with a thickness of 50-80mm to reduce the overall heat loss of the device and ensure the stability of the hydrolysis reaction temperature and the heat recovery efficiency.

[0035] The high-temperature pressure reactor 4, electromagnetic metering feed pump, low-speed stirrer, variable frequency circulating pump, jacketed temperature control module, pressure monitoring and pressure relief module, platinum resistance temperature sensor, and liquid level sensor are all electrically connected to the PLC control terminal. The PLC control terminal can receive signals from each monitoring component in real time and automatically adjust the operating parameters of each power component to achieve automated and coordinated control of the hydrolysis process and heat recovery process, reducing the intensity of manual operation.

[0036] In practical use, this system has the following advantages: (1) Taking the high-temperature pressure reactor 4, which is customized for the characteristics of protein hydrolysate, as the core, and with the continuous quantitative feeding of the electromagnetic metering feed pump and the continuous cooling discharge of the shell-and-tube heat exchanger 7, the traditional batch operation is replaced, realizing the continuous high-temperature and high-pressure hydrolysis of protein, and the production efficiency is increased by more than 50%. At the same time, the PLC control terminal realizes the precise closed-loop control of parameters such as reaction temperature, pressure, feed rate, and stirring speed, ensuring the stability of reaction conditions, solving the problem of uneven product quality in batch production, and significantly improving the uniformity of composition, purity, and molecular weight distribution of hydrolysate.

[0037] (2) The heat transfer oil closed-loop heat recovery circulation system uses heat transfer oil as an indirect heat transfer medium to recover the waste heat in the cooling process of high-temperature products and use it in stages to preheat the feed raw materials, thereby realizing the closed-loop recovery and reuse of waste heat and avoiding the direct loss of waste heat. According to actual calculations, the energy utilization rate of the device of the present invention is increased by more than 60%, and the energy consumption of the reactor heating raw materials is reduced by more than 50%, which greatly reduces the industrial production cost and conforms to the industrial production concept of energy saving and environmental protection.

[0038] (3) The high temperature and pressure reactor 4 is customized for the viscosity of protein solution and the denaturation characteristics of materials during hydrolysis. The internal spiral stirring paddle can achieve full mixing of raw materials and subcritical water. Combined with the high temperature of 200℃ and the high pressure of 2.0MPa, the hydrolysis reaction rate is accelerated, the raw material conversion rate is increased to more than 95%, the hydrolysis efficiency is greatly improved, and the waste of raw material residue is reduced.

[0039] (4) The heat recovery system uses heat transfer oil as an indirect heat transfer medium. The raw materials and products do not come into direct contact, which effectively avoids cross-contamination between the raw materials and products, solves the pollution problem of the existing direct heat exchange structure, improves the quality of hydrolysis products, and meets the hygiene requirements of food, medicine and other fields.

[0040] (5) All power and control components are electrically connected to the PLC control terminal to realize the automated coordinated control of the entire hydrolysis process and heat recovery process, without the need for real-time manual intervention, reducing the intensity of manual operation and human error; at the same time, it is equipped with multiple safety protection components such as pressure monitoring and pressure relief, real-time temperature monitoring, and liquid level monitoring and early warning to ensure the safe operation of the device; (6) The parameters of the raw material storage tank, high temperature pressure reactor 4, product storage tank, heat exchanger 7, preheater and other equipment are precisely matched and designed to meet the needs of industrial-scale continuous production; the overall structure of the device is compact and occupies a small area. The feed rate and reaction parameters can be flexibly adjusted according to actual production needs. It has strong practicality and promotion value and can be widely used in protein hydrolysis processing in food, medicine, feed, biochemical and other fields.

[0041] Example 1: Subcritical Continuous Hydrolysis System for Proteins This example specifically combines... Figure 1 The system is described in detail below.

[0042] The system includes components connected sequentially via 316 stainless steel pipes in the direction of material feed: Raw material storage tank – 15m³ 304 stainless steel raw material storage tank, with built-in 15r / min low-speed agitator; electromagnetic metering feed pump, feed rate 0.5-5m³ / h; 10㎡ shell-and-tube preheater, 316 stainless steel feed pipeline 1, feed pipeline 1 is equipped with DN40 / PN16 ball valve, pressure transfer pump (Q=4m³ / h, H=360m, material 316L, equipped with P=15kw variable frequency motor, inlet DN40 / outlet DN25), and back pressure valve; The first preheater 2 is connected to the heat exchanger 7 via a circulation pipeline 8 to achieve closed-loop circulation of the heat transfer oil. Specifically, the inlet of the heating jacket of the first preheater 2 is connected to the outlet of the heat exchanger jacket of the heat exchanger 7 via the circulation pipeline 8, and the outlet of the heating jacket of the first preheater 2 is connected to the inlet of the heat exchanger jacket of the heat exchanger 7 via a 304 stainless steel heat transfer oil circulation pipeline 8. The system includes a variable frequency heat transfer oil circulation pump (adjustable flow rate), a platinum resistance temperature sensor (monitoring accuracy ±0.5℃), and L-QB300 type heat transfer oil.

[0043] An intermediate tank is also installed in the circulation pipeline, such as Figure 1 As shown, the intermediate tank is regulated by the ZF205 valve. Since the circulating pipeline contains heat transfer oil, the heat transfer oil will expand and contract with temperature changes. Moreover, the new heat transfer oil will contain water. When the heat transfer oil is used for the first time, the water must be evaporated. The water and air will be discharged through the ZF206 exhaust valve of the intermediate tank. The intermediate tank is also equipped with a LI / LT level gauge to know whether the heat transfer oil in the circulating pipeline is low.

[0044] The second preheater 3 has a heating jacket for preheating the circulating material. The inlet and outlet of the heating jacket of the second preheater 3 are respectively connected to heat transfer oil inlet 1 and heat transfer oil outlet 2 to realize heat source supply.

[0045] High-temperature pressure reactor 4 – A customized high-temperature pressure reactor 4 with a design operating temperature of 200℃ and a design operating pressure of 2.0MPa; jacketed temperature control module (heat transfer oil medium, electric heating tube, high-precision temperature sensor, control error ±1℃); pressure monitoring and pressure relief module (high-precision pressure sensor, 2.0MPa spring-loaded discharge valve); 45r / min spiral 316 stainless steel agitator.

[0046] Heat exchanger 7 – 10㎡ shell and tube heat exchanger 7, Product storage tank - 20m³ 304 stainless steel product storage tank (with built-in liquid level sensor).

[0047] All the above devices are connected by 316 stainless steel pipes, and the outside of the pipes is wrapped with a 60mm thick asbestos insulation layer. All electrical and control components are electrically connected to the PLC control terminal to realize automated operation.

[0048] The reaction system based on this embodiment executes the following process flow: Raw material mixing and continuous feeding: Add protein raw materials and water to a 15m³ raw material storage tank at a preset mass ratio, turn on a low-speed stirrer at 15r / min to stir the mixture evenly and prevent protein raw materials from settling; turn on the electromagnetic metering feed pump to send the mixture into feed pipeline 1 at a rate of 4m³ / h. After the hydrolyzed protein raw material liquid is preheated to 80-150℃ by the first preheater 2E01 with waste heat recovery, it is then heated to 200℃ by the second preheater 3E02 and continuously and quantitatively fed into the high-temperature pressure reactor 4.

[0049] High-temperature and high-pressure continuous hydrolysis: The PLC control terminal activates the jacketed temperature control module, which heats the heat transfer oil through the electric heating tube to regulate the internal temperature of the high-temperature and high-pressure reactor 4 to 200℃. The pressure monitoring and pressure relief module maintains the internal pressure of the reactor at 2MPa. The 45r / min spiral agitator is activated to fully stir the mixture in the reactor, achieving high-temperature and high-pressure continuous hydrolysis of the protein. The hydrolysis reaction residence time is 30min.

[0050] Product cooling and waste heat closed-loop recovery: The high-temperature product (200℃) after hydrolysis is discharged from the outlet of the high-temperature pressure reactor 4 and enters the 10㎡ shell-and-tube heat exchanger 7E03. The high-temperature product undergoes indirect heat exchange with the L-QB300 type heat transfer oil in the heat exchanger 7. After the product temperature is rapidly cooled to 25℃ (room temperature), it enters the 20m³ product storage tank for collection. The liquid level sensor in the product storage tank monitors the liquid level in real time. When the liquid level reaches 80%, an early warning is issued, and the product is transferred in time. The heat transfer oil (temperature rises to 100-180℃) after absorbing heat is driven by the variable frequency heat transfer oil circulation pump and flows into the first preheater 2 through the heat transfer oil circulation pipeline 8 to preheat the mixed liquid in the feed pipeline 1. After the heat transfer oil releases heat, the temperature drops to 50℃ and then flows back to the shell-and-tube heat exchanger 7E03 to cool the material, completing the cascade recovery and closed-loop reuse of waste heat.

[0051] Automated monitoring and control: Throughout the process, the PLC control terminal receives signals in real time from high-precision temperature sensors, pressure sensors, platinum resistance temperature sensors, and liquid level sensors. Based on the actual monitoring data, it automatically adjusts the feed rate of the electromagnetic metering feed pump, the speed of the agitator, the flow rate of the variable frequency heat transfer oil circulation pump, and the heating power of the jacketed temperature control module to ensure the stable operation of the hydrolysis reaction and heat recovery. When the pressure inside the reactor exceeds 2.0 MPa, the spring-loaded discharge valve automatically opens to discharge the material. When the pressure exceeds 2.5 MPa, the safety valve automatically opens to release pressure, ensuring the safe operation of the device.

[0052] The system from Example 1 was applied to the hydrolysis production of soy protein isolate. Performance comparison tests were conducted with a traditional batch-type atmospheric pressure hydrolysis unit and an existing general-purpose high-temperature and high-pressure hydrolysis unit. The test results are as follows: Production efficiency: The production efficiency of the device of the present invention is 4 m³ / h, while that of the traditional batch-type atmospheric pressure hydrolysis device is 0.8 m³ / h and that of the existing general-purpose high temperature and high pressure hydrolysis device is 1.0 m³ / h. The production efficiency of the device of the present invention is increased by 300% and 400% respectively.

[0053] Raw material conversion rate: The soybean protein isolate conversion rate of the device of the present invention is 96.5%, while that of the traditional batch-type atmospheric pressure hydrolysis device is 75.2% and that of the existing general-purpose high temperature and high pressure hydrolysis device is 82.8%. The raw material conversion rate of the device of the present invention is increased by 28.3% and 16.5%, respectively.

[0054] Product uniformity: The molecular weight distribution coefficient of the hydrolysis product of the device of the present invention is 1.25, while that of the traditional batch-type atmospheric pressure hydrolysis device is 1.86, and that of the existing general-purpose high temperature and high pressure hydrolysis device is 1.63. The smaller the molecular weight distribution coefficient, the better the product uniformity. The product uniformity of the device of the present invention is significantly better than that of the existing devices.

[0055] Energy utilization rate: The energy utilization rate of the device of the present invention is 85.3%, while that of the traditional batch-type atmospheric pressure hydrolysis device is 28.5% and that of the existing general-purpose high temperature and high pressure hydrolysis device is 32.8%. The energy utilization rate of the device of the present invention is increased by 199.3% and 160.1%, respectively.

[0056] Production energy consumption: The energy consumption of the device of the present invention to produce 1 ton of hydrolysis product is 85 kWh, while that of the traditional batch-type atmospheric pressure hydrolysis device is 215 kWh and that of the existing general-purpose high temperature and high pressure hydrolysis device is 198 kWh. The production energy consumption of the device of the present invention is reduced by 60.5% and 57.1%, respectively.

[0057] Test results show that the continuous protein hydrolysis device of the present invention is significantly superior to the prior art in terms of production efficiency, raw material conversion rate, product uniformity, and energy utilization rate, and the production energy consumption is greatly reduced. It combines high efficiency and energy saving and is suitable for the needs of industrial-scale protein hydrolysis production.

Claims

1. A protein subcritical continuous hydrolysis system, characterized in that, The system includes a raw material storage tank, a high-temperature pressure reactor, and a product storage tank, which are connected sequentially by pipelines. The high-temperature pressure reactor is equipped with a temperature control jacket on the outside and an agitator installed inside. A discharge valve with pressure monitoring is installed on the top of the high-temperature pressure reactor. The discharge valve opens when the pressure exceeds a threshold. The discharge valve is connected to a discharge pipeline. One or more heat exchangers are provided on the discharge pipeline. One or more preheaters are provided between the raw material storage tank and the high-temperature pressure reactor. A closed circulation pipeline is provided between at least one preheater and at least one heat exchanger.

2. The protein subcritical continuous hydrolysis system according to claim 1, characterized in that, The raw material storage tank is made of 304 stainless steel and is equipped with a low-speed agitator of 15 r / min and an electromagnetic metering feed pump with a feeding rate of 0.5-5 m³ / h.

3. The protein subcritical continuous hydrolysis system according to claim 1, characterized in that, It also includes a feed pipeline for connecting the raw material storage tank and the high-temperature pressure reactor for feeding. The preheater is installed on the feed pipeline, and a pressure delivery pump is configured on the feed pipeline.

4. The protein subcritical continuous hydrolysis system according to claim 3, characterized in that, The feed pipeline, high-temperature pressure reactor, and product discharge pipeline are all wrapped with an asbestos insulation layer with a thickness of 50-80mm.

5. The protein subcritical continuous hydrolysis system according to claim 1, characterized in that, The high-temperature pressure reactor has a volume of 2 m³, the raw material storage tank has a volume of 15 m³, the product storage tank has a volume of 20 m³, each heat exchanger has a heat exchange area of ​​10 m², and each preheater has a heat exchange area of ​​10 m².

6. The protein subcritical continuous hydrolysis system according to claim 1, characterized in that, The preheater includes a first preheater and a second preheater connected in series according to the material conveying direction. There is one heat exchanger. A circulation pipeline is provided between the heat exchanger and the first preheater. The circulation pipeline contains heat transfer oil and the heat transfer oil circulates in a closed loop between the first preheater and the heat exchanger.

7. The protein subcritical continuous hydrolysis system according to claim 6, characterized in that, The temperature of the material after preheating in the first preheater is 80-150℃, and the temperature of the material after preheating in the second preheater is 200℃.

8. The protein subcritical continuous hydrolysis system according to claim 1, characterized in that, The circulation pipeline is equipped with a variable frequency circulation pump and a platinum resistance temperature sensor. The variable frequency circulation pump is used to drive the heat transfer oil to circulate in a closed loop between the first preheater and the heat exchanger. The heat transfer oil used is L-QB300 type heat transfer oil.

9. The protein subcritical continuous hydrolysis system according to claim 1, characterized in that, The high-temperature pressure reactor is designed to operate at a temperature of 200℃ and a pressure of 2.0MPa; the discharge valve is designed to operate at a pressure threshold of 2.0MPa; and the stirring paddle inside the high-temperature pressure reactor rotates at a speed of 30-60 r / min.

10. The protein subcritical continuous hydrolysis system according to claim 1, characterized in that, The high-temperature pressure reactor is also equipped with a 2.5MPa safety valve.

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