Production and processing system for reducing lactic acid degree of high-protein sterilized bacteria

Abstract

The utility model provides a production and processing system for reducing the lactic acid degree of high-protein sterilized bacteria. The production and processing system for reducing the high-protein sterilized lactic acid degree comprises a filtering unit (1), a cooling storage unit (2), a separation and degreasing unit (3), a chromatographic extraction unit (4), a mixing and homogenizing unit (5), a flash evaporation unit (6), a cooling unit (7), a vacuum degassing unit (8), a homogenizing unit (9), a sterilization unit (10) and a sterile filling unit (11) which are sequentially connected, wherein the chromatographic extraction unit (4) comprises a chromatographic extraction column. The production and processing system for reducing the acidity of the high-protein sterilized milk can be used for preparing the high-protein sterilized milk, and meanwhile, the acidity of a finished product does not exceed the upper limit value of the national standard.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of production and processing systems for reducing high protein sterilized milk acidity, belong to dairy production technical field. BACKGROUND

[0002] According to the provisions of "GB 25190-2010 Food Safety National Standard: Sterilized Milk" and "GB 19301-2010 Food Safety National Standard: Raw Milk", the acidity range of pure milk should be controlled at 12-18 °T.

[0003] The acidity sources in pure milk are mainly divided into inherent acidity, microbial metabolic acid production, high-temperature lactose production acid in production process and fat oxidation acid in shelf life. Among them, the composition of inherent acidity includes: the acidity brought by casein and albumin is about 3-4 °T, the acidity brought by phosphate and citrate is 10-12 °T, and the acidity brought by carbon dioxide gas is about 2 °T.

[0004] The requirement of national standard for acidity has been a "neck" problem for the development of high-protein sterilized milk. Specifically: when the protein content of pure milk is about 3.8%, the off-line acidity of the production line is about 17 °T, and the acidity during shelf life will slowly increase by 1 °T, which exceeds the upper limit of 18 °T, resulting in unqualified product quality.

[0005] Therefore, it is a technical problem to be solved in the field to develop a production and processing system capable of controlling the acidity of high-protein sterilized milk. CONTENT OF THE UTILITY MODEL

[0006] To solve the above technical problems, the purpose of the utility model is to provide a production and processing system for sterilized milk, which is provided with a chromatography extraction unit and a flash evaporation unit. Using the production and processing system can not only prepare sterilized milk, but also reduce the acidity of sterilized milk.

[0007] To achieve the above purpose, the utility model provides a production and processing system for reducing the acidity of high-protein sterilized milk, wherein the production and processing system for reducing the acidity of high-protein sterilized milk comprises a filter unit, a cooling storage unit, a separation and degreasing unit, a chromatography extraction unit, a mixing and homogenizing unit, a flash evaporation unit, a cooling unit, a vacuum degassing unit, a homogenizing unit, a sterilization unit and a sterile filling unit connected in sequence.

[0008] The chromatography extraction unit comprises a chromatography extraction column.

[0009] In the above production processing system, the chromatographic extraction unit can effectively reduce the acidity without affecting other nutritional components of the milk, and improve the taste and stability of the product. Preferably, the height of the chromatographic extraction column is 2-2.5 meters, and the diameter is 50-60 centimeters, more preferably, the height of the chromatographic extraction column is about 2 meters, and the diameter is about 50 centimeters.

[0010] In the above production processing system, preferably, the chromatographic extraction unit comprises a feed pipe and a discharge pipe; wherein the feed pipe is connected to the skim milk outlet of the separation and skim milk unit and the inlet of the chromatographic extraction column; the discharge pipe is connected to the outlet of the chromatographic extraction column and the inlet of the mixing and homogenizing unit.

[0011] In the above production processing system, the chromatographic extraction unit is used to separate phosphates and citrates in skim milk to reduce the inherent acidity of the milk; preferably, the chromatographic extraction unit comprises a cleaning liquid storage tank and a cleaning pipe; the cleaning pipe connects the cleaning liquid storage tank and the chromatographic extraction column to form a loop.

[0012] In the above production processing system, preferably, the chromatographic extraction column is made of ion exchange resin or adsorption material.

[0013] In the above production processing system, preferably, the chromatographic extraction unit is provided with an automatic control system for controlling the feeding speed and the pressure of the chromatographic column. The automatic control system can be any device capable of achieving such control.

[0014] In the above production processing system, the flash unit is an important degassing unit. Flashing and degassing the milk liquid through the flash unit can effectively reduce the microbial burden and acidity of the milk, and improve the taste and texture of the milk. Preferably, the flash unit comprises at least one flash tower, and the height of the flash tower is 3-5 meters and the diameter is 0.8-1.5 meters; more preferably, the height of the flash tower is about 3 meters and the diameter is about 1 meter.

[0015] In the above production processing system, preferably, the flash unit comprises a single-stage flash tower or a multi-stage flash tower. The use of multi-stage flash design can remove CO2 gas in stages to achieve better removal effect, and the content of CO2 gas in the flashed liquid is less than 0.5 ppm.

[0016] In the above production processing system, preferably, the flash tower is provided with a heater, a vacuum pump, a material circulating pump, a temperature sensor, a pressure sensor, a gas-liquid separation chamber, a condensation chamber, an evaporator, a condensate recovery pump, a steam pipe, and a condensate pipe.

[0017] The heater is used to heat the liquid that needs to be flash evaporated. It is equipped with a top inlet, a bottom outlet, and a circulation inlet. The top inlet of the heater is used to input the milk liquid that needs to be flash evaporated. The bottom outlet is connected to the inlet of the material circulation pump for outputting the flash evaporated milk liquid. The heater is connected to the condensed water pipeline for discharging the condensed water formed by the condensation of steam in the heater.

[0018] The evaporator is connected between the heater and the gas-liquid separation chamber and is used to evaporate the gas separated by the heater;

[0019] The gas-liquid separation chamber is used to separate the liquid from CO2 and water vapor in the gas. It is provided with a gas outlet and a liquid outlet. The gas outlet is connected to the circulation inlet of the heater and the inlet of the condensation chamber respectively. The gas outlet is used to output the separated gas. When circulation separation is required, the separated gas is sent to the circulation inlet of the heater. When the condensed water is recovered, the separated gas is sent to the condensation chamber. The liquid outlet is connected to the inlet of the material circulation pump to output the milk liquid obtained by gas-liquid separation.

[0020] The condensation chamber is used to condense the separated gas. Its outlet is connected to the condensation water pipeline, and a recovery pump is provided on the condensation water pipeline. The condensation chamber is also connected to a vacuum pump to form a vacuum environment. The condensation chamber is also provided with an ice water pipeline to provide the cooling capacity required for condensation.

[0021] The outlet of the material circulation pump is connected to the inlet of the cooling unit (plate heat exchanger);

[0022] The bottom outlet of the gas-liquid separation chamber is connected to the inlet of the material circulation pump; the outlet of the condensation chamber is connected to the inlet of the vacuum pump; a temperature sensor and a pressure sensor are provided at the bottom of the heater;

[0023] The flash unit is also equipped with steam lines to provide heat to the heater and condensing chamber;

[0024] The condenser is used to condense the gas separated from the gas-liquid separation chamber;

[0025] The vacuum pump is used to provide a vacuum environment;

[0026] The temperature sensor and pressure sensor are used to detect the temperature and pressure inside the evaporator respectively.

[0027] In the above-mentioned production and processing system, preferably, in the flash tower, milk enters from the top of the heater, and due to its own weight, the milk passes through the inner wall of the internal membrane distributor tube from top to bottom, and evaporates by heat exchange with the steam heated by the outer wall. The evaporated part of the milk and the secondary steam enter the gas-liquid separation chamber for gas-liquid separation, and the liquid milk is sent out through the material circulation pump, and the secondary steam enters the condensation chamber for condensation and is discharged by the vacuum pump.

[0028] In the above production processing system, preferably, the evaporator is a single-effect falling film evaporator.

[0029] In the above production processing system, preferably, in the flash tower, the circulation outlet of the evaporator is connected to the inlet of the condenser, in particular, connected to the pipeline between the collector and the inlet of the condenser.

[0030] In the above production processing system, the flash tower is equipped with temperature and pressure sensors to monitor the temperature and pressure in real time during the flash evaporation process, and the condenser and the collector are used to recover the condensed water vapor and volatile substances, respectively. The flash evaporation unit can include a control system for controlling the flash tank and other equipment to accurately control process parameters such as temperature and time during flash evaporation to avoid loss of nutrients.

[0031] In the above production processing system, preferably, the production processing system further comprises a milk collection unit; in particular, the milk collection unit can include a milk collection pump, a milk collection pipeline, and a plate heat exchanger. One end of the milk collection pump is connected to the raw milk storage device, and the other end is connected to the inlet of the plate heat exchanger through the milk collection pipeline. The outlet of the plate heat exchanger is connected to the inlet of the filtration unit. The milk collection unit is used to receive raw milk transported from a dairy farmer or a milk station, and the temperature of the raw milk is controlled by the plate heat exchanger. By strictly controlling the temperature of the raw milk through the milk collection unit, the collected raw milk can be kept at the optimal storage temperature, which can significantly reduce the growth rate of microorganisms, thereby ensuring the freshness and safety of the raw milk. After passing through the plate heat exchanger, the raw milk enters the filtration unit.

[0032] In the above production processing system, the inlet of the filtration unit is connected to the outlet of the milk collection unit, and the outlet of the filtration unit is connected to the inlet of the cooling storage unit. Preferably, the filtration unit comprises a single filter or a double filter with a mesh size of 60-80, which is made of food-grade stainless steel material and can withstand high-temperature sterilization and disinfection. By using the filtration unit, solid impurities can be removed to prevent wear and blockage of equipment in subsequent processing, and the overall sensory quality of the raw milk can be improved.

[0033] In the above production processing system, the outlet of the cooling storage unit is connected to the inlet of the separation and defatting unit. Preferably, the cooling storage unit comprises a raw milk storage container and a plate heat exchanger for maintaining the temperature of the raw milk in the raw milk storage container. The plate heat exchanger uses ice water as the heat exchange medium and is provided with a cooling water pipeline connected to an external ice water supply device. The low-temperature storage unit is used to cool and store the filtered raw milk. Cooling and low-temperature storage through the cooling storage unit can slow down the activity of microorganisms and the rate of chemical reactions, significantly prolong the shelf life of the raw milk, and prevent rancidity and protein denaturation.

[0034] In the above production system, the separation and defatting unit comprises a skim milk outlet and a cream outlet, the skim milk outlet is connected to the inlet of the chromatographic extraction unit (e.g. the inlet of the chromatographic extraction column), and the cream outlet is connected to the cream inlet of the mixing and homogenizing unit. Preferably, the separation and defatting unit comprises a small-flow disc separator, and the separation temperature and the water content of the cream can be adjusted by the discharge valve. The milk feed can be separated into skim milk and cream by the separation and defatting unit, and the defatting process not only meets the needs of different consumers for fat content, but also improves the chromatographic extraction efficiency in the chromatographic extraction unit, because fat molecules may hinder the chromatographic process. Moreover, the fat content can be adjusted according to product needs, while increasing the throughput of the chromatographic extraction unit.

[0035] In the above production system, preferably, the mixing and homogenizing unit comprises a skim milk inlet and a cream inlet, wherein the skim milk inlet is connected to the outlet of the chromatographic extraction unit (i.e. the outlet of the chromatographic extraction column), and the cream inlet is connected to the cream outlet of the separation and defatting unit; the outlet of the mixing and homogenizing unit is connected to the inlet of the flash evaporation unit. Preferably, the mixing and homogenizing unit comprises a dynamic mixer (e.g. an online dynamic mixer) and a homogenizer, wherein the dynamic mixer is used to mix the cream and the skim milk uniformly, and then the mixture is input into the homogenizer for homogenization treatment, and the dynamic mixer is equipped with two feeding pipelines, one of which is connected to the cream outlet of the separation and defatting unit for inputting the cream, and the other of which is connected to the outlet of the chromatographic extraction unit (i.e. the outlet of the chromatographic extraction column) for inputting the skim milk after chromatographic extraction. By using the mixing and homogenizing unit to mix the cream and the skim milk after chromatographic extraction, and then performing high-pressure homogenization, the fineness and uniformity of the milk can be improved, the stability and taste of the milk can be improved, fat floating can be effectively prevented, and the uniformity of the milk can be maintained. Moreover, mixing the skim milk and the cream uniformly before flash evaporation treatment can also improve the flash evaporation and degassing effect in the flash evaporation unit, and the CO2 content is as low as possible.

[0036] In the above production system, the inlet of the cooling unit is connected to the outlet of the flash evaporation unit, and the outlet of the cooling unit is connected to the inlet of the vacuum degassing unit. Preferably, the cooling unit comprises a plate heat exchanger for cooling the homogenized milk feed, the plate heat exchanger uses ice water as the heat exchange medium, is provided with a cooling water pipeline, and is connected to an external ice water supply device. By using the homogenizing unit to cool the milk feed after flash evaporation, the quality of the milk can be stabilized, and specifically the temperature of the milk can be rapidly reduced to prevent the growth of microorganisms and provide suitable temperature conditions for subsequent degassing and sterilization.

[0037] In the above production and processing system, the outlet of the vacuum degassing unit is connected with the inlet of the homogenizing unit, preferably, the vacuum degassing unit comprises a degassing tank equipped with a vacuum pump. By creating a negative pressure environment through the vacuum pump, air and other gases can be further removed from the milk. More preferably, the bottom and side of the degassing tank are provided with independent cooling water interlayers, and the cooling water is provided by an external source. By providing the cooling water interlayers, the degassing tank can be prevented from scaling. By degassing the milk slurry through the vacuum degassing unit, the oxidation of the milk can be reduced and the odor problem can be prevented, and the storage stability and taste of the milk can be significantly improved.

[0038] In the above production and processing system, the outlet of the homogenizing unit is connected with the inlet of the sterilization unit. Preferably, the homogenizing unit comprises a homogenizer capable of achieving a homogenizing pressure of 250 bar. By homogenizing the milk slurry through the homogenizing unit, fat layering can be prevented, the uniformity and stability of the milk can be increased, and the taste and digestive absorption can be improved.

[0039] In the above production and processing system, preferably, the sterilization unit comprises an ultra-high temperature sterilization device, i.e. an ultra-high temperature sterilization unit. The ultra-high temperature sterilization device can be a tubular heat exchanger and is equipped with a balance cylinder, having an independent CIP cleaning and SIP sterilization system. By using the ultra-high temperature sterilization unit to perform ultra-high temperature sterilization on the milk slurry, all microorganisms and pathogens in the milk can be instantly killed, the shelf life of the milk can be greatly extended, and more nutrients can be retained.

[0040] In the above production and processing system, the inlet of the aseptic filling unit is connected with the outlet of the sterilization unit, and preferably, the aseptic filling unit comprises an aseptic paper packaging filling machine, having a packaging material sterilization function. By using the aseptic filling unit to perform aseptic filling of the milk, the safety of the final product can be ensured, and specifically, secondary pollution can be effectively avoided, and the stability and safety of the product on the shelf can be maintained.

[0041] When the production and processing system for reducing the acidity of high-protein sterilized milk is used for production, the following steps can be performed:

[0042] 1. Fresh milk is collected by the milk collection unit, and preliminary temperature control (generally 1-8℃) is performed to obtain a milk slurry;

[0043] 2. The temperature-controlled milk slurry is input into the filtering unit for filtration;

[0044] 3. The filtered milk slurry is input into the cooling and storage unit for cooling and low-temperature storage, generally the temperature of the filtered milk is rapidly reduced to 1-6℃, and stored at this temperature;

[0045] 4, the milk liquid after storage is input into a separation and defatting unit to carry out defatting separation to obtain skimmed milk and cream, and the defatting is generally carried out at 55-65 DEG C;

[0046] 5, the skimmed milk is input into a chromatography extraction unit to remove phosphates and citrates;

[0047] 6, the cream and the skimmed milk after chromatography extraction are input into a mixing and homogenizing unit to carry out mixing and homogenizing;

[0048] 7, the milk liquid after homogenizing is input into a flash evaporation unit to carry out flash evaporation degassing to remove CO2;

[0049] 8, the milk liquid after flash evaporation degassing is input into a cooling unit to carry out cooling;

[0050] 9, the milk liquid after cooling is input into a vacuum degassing unit to carry out vacuum degassing;

[0051] 10, the milk liquid after vacuum degassing is input into a homogenizing unit to carry out secondary homogenizing;

[0052] 11, the milk liquid after secondary homogenizing is input into a sterilization unit to carry out ultra-high temperature sterilization;

[0053] 12, the milk liquid after sterilization is input into a sterile filling unit to carry out sterile filling to obtain sterilized milk.

[0054] Generally, the contribution of phosphates and citrates in raw milk to acidity is about 70%, the production and processing system for reducing the acidity of high-protein sterilized milk of the utility model adopts the directional extraction equipment of the chromatography extraction unit, which can significantly reduce the content of phosphates and citrates in pure milk, thereby reducing the acidity of pure milk. Pure milk may contain a certain amount of CO2 gas, which can increase the acidity of pure milk, the production and processing system for reducing the acidity of high-protein sterilized milk of the utility model adopts a flash tank to optimize the flash evaporation effect, which can remove CO2 gas in the pure milk semi-finished product, and the CO2 content in the pure milk product obtained by the flash evaporation unit is less than 0.5ppm.

[0055] The production and processing system for reducing the acidity of high-protein sterilized milk can prepare high-protein sterilized milk, and the acidity of the finished product does not exceed the upper limit value of the national standard. DETAILED DESCRIPTION

[0056] Figure 1 The structure schematic view of the production and processing system for reducing the acidity of high-protein sterilized milk provided for example 1.

[0057] Figure 2 The structure schematic view of the flash evaporation unit of example 1.

[0058] MAIN REFERENCE NUMBER EXPLANATION:

[0059] filtering unit 1, cooling storage unit 2, separation and defatting unit 3, chromatographic extraction unit 4, mixing and homogenizing unit 5, flash evaporation unit 6, cooling unit 7, vacuum degassing unit 8, homogenizing unit 9, sterilization unit 10, aseptic filling unit 11, milk receiving unit 12;

[0060] heater 61, vacuum pump 62, material circulating pump 63, temperature sensor 64, pressure sensor 65, gas-liquid separation chamber 66, condensation chamber 67, evaporator 68, condensate recovery pump 69, steam pipeline 610, condensate pipeline 611. DETAILED DESCRIPTION

[0061] In order to have a clearer understanding of the technical features, objectives and beneficial effects of the present application, the technical solutions of the present application will be described in detail as follows, but it cannot be understood as limiting the scope of the present application.

[0062] Example 1

[0063] The present embodiment provides a production and processing system for reducing the acidity of high-protein sterilized milk, which has the structure as shown in the figure. Figure 1 The production and processing system comprises, in sequence, a milk receiving unit 12, a filtering unit 1, a cooling storage unit 2, a separation and defatting unit 3, a chromatographic extraction unit 4, a mixing and homogenizing unit 5, a flash evaporation unit 6, a cooling unit 7, a vacuum degassing unit 8, a homogenizing unit 9, a sterilization unit 10, and an aseptic filling unit 11.

[0064] Among them:

[0065] The milk receiving unit 12 comprises a milk receiving pump, a milk receiving pipeline, and a plate heat exchanger. The inlet of the milk receiving pump is connected to a raw milk storage device, and the outlet is connected to the inlet of the plate heat exchanger through the milk receiving pipeline. The outlet of the plate heat exchanger is connected to the inlet of the filtering unit. The pipeline is a stainless steel pipeline. Unless otherwise specified, the following pipelines are also stainless steel pipelines.

[0066] The filtering unit 1 is specifically a single filter or a double filter with a mesh size of 60-80. The inlet of the filtering unit 1 is connected to the outlet of the milk receiving unit 12, and the outlet of the filtering unit 1 is connected to the inlet of the cooling storage unit 2.

[0067] The cooling storage unit 2 comprises a milk liquid storage container and a plate heat exchanger. The plate heat exchanger uses ice water as the heat exchange medium and is provided with a cooling water pipeline connected to an external ice water supply device. The outlet of the cooling storage unit 2 is connected to the inlet of the separation and defatting unit 3.

[0068] Separation and defatting unit 3: specifically a small-flow disc separator; the separation and defatting unit 3 includes a defatted milk outlet and a cream outlet, the defatted milk outlet is connected with the inlet of the chromatographic extraction column of the chromatographic extraction unit 4, and the cream outlet is connected with the cream inlet of the mixed homogenization unit 5;

[0069] Chromatographic extraction unit 4: including a chromatographic extraction column, a feeding pipeline, a discharging pipeline, a cleaning liquid storage tank and a cleaning pipeline, wherein the length of the chromatographic extraction column is 2 meters and the diameter is 50 centimeters; the feeding pipeline connects the defatted milk outlet of the separation and defatting unit 3 with the inlet of the chromatographic extraction column; the discharging pipeline connects the outlet of the chromatographic extraction column with the inlet of the mixed homogenization unit 5; the cleaning pipeline connects the cleaning liquid storage tank with the chromatographic extraction column to form a loop for cleaning operation;

[0070] Mixed homogenization unit 5: including a dynamic mixer and a homogenizer connected with each other, the dynamic mixer is equipped with two feeding pipelines, one of which is connected to the cream outlet of the separation and defatting unit for inputting cream, and the other of which is connected to the outlet of the chromatographic extraction column of the chromatographic extraction unit 4 for inputting defatted milk after chromatographic extraction; the outlet of the dynamic mixer is connected with the inlet of the homogenizer, and the outlet of the homogenizer is connected with the inlet of the flash evaporation unit 6;

[0071] Flash evaporation unit 6: as shown in Figure 2 , including a single-stage flash evaporation tower, the height of the flash evaporation tower is 3 meters and the diameter is 1 meter; the flash evaporation tower is provided with a heater 61, a vacuum pump 62, a material circulating pump 63, a temperature sensor 64, a pressure sensor 65, a gas-liquid separation chamber 66, a condensation chamber 67, an evaporator 68, a condensate water recovery pump 69, a steam pipeline 610 and a condensate water pipeline 611, wherein:

[0072] The heater 61 is used for heating the material liquid needing to be flashed, and is provided with a top inlet, a bottom outlet and a circulating inlet; the top inlet of the heater 61 is used for inputting the milk material liquid needing to be flashed, the bottom outlet is connected with the inlet of the material circulating pump 63 for outputting the milk material liquid after being flashed; the heater 61 is connected with the condensate water pipeline 611 for discharging the condensate water formed by condensation of steam in the heater 61;

[0073] The evaporator 68 is connected between the heater 61 and the gas-liquid separation chamber 66, and is used for evaporating the gas separated from the heater 61;

[0074] The gas-liquid separation chamber 66 is used for separating the material liquid in the gas from the CO2 and water vapor, and is provided with a gas outlet and a liquid outlet. The gas outlet is connected with the circulating inlet of the heater 61 and the inlet of the condensation chamber 67 respectively, and is used for outputting the separated gas. When the separation needs to be recycled, the separated gas is sent to the circulating inlet of the heater 61; when the condensed water is recovered, the separated gas is sent to the condensation chamber 67. The liquid outlet is connected with the inlet of the material circulating pump 63, and is used for outputting the milk material liquid separated by the gas-liquid separation;

[0075] The condensation chamber 67 is used for condensing the separated gas, and the outlet thereof is connected with the condensed water pipeline 611. The condensed water pipeline 611 is provided with a recovery pump 69. The condensation chamber 67 is also connected with the vacuum pump 62, which is used for forming a vacuum environment. The condensation chamber 67 is also provided with an ice water pipeline, which is used for providing the cold energy required for condensation;

[0076] The outlet of the material circulating pump 63 is connected with the inlet of the cooling unit (plate heat exchanger) 7.

[0077] The bottom outlet of the gas-liquid separation chamber 66 is connected with the inlet of the material circulating pump 63. The outlet of the condensation chamber 67 is connected with the inlet of the vacuum pump 62. The bottom of the heater 61 is provided with a temperature sensor 64 and a pressure sensor 65.

[0078] The flash evaporation unit 6 is also provided with a steam pipeline 610, which is used for providing heat for the heater 61 and the condensation chamber 67.

[0079] The cooling unit 7 includes a plate heat exchanger and corresponding pipelines. The plate heat exchanger takes ice water as the heat exchange medium, and is provided with a cooling water pipeline, which is connected to an external ice water supply device. The inlet of the plate heat exchanger of the cooling unit 7 is connected with the outlet of the flash evaporation unit 6. The outlet of the plate heat exchanger of the cooling unit 7 is connected with the inlet of the degassing tank of the vacuum degassing unit 8.

[0080] The vacuum degassing unit 8 includes a degassing tank provided with a vacuum pump. The bottom and the side of the degassing tank are provided with independent cooling water interlayers, and the cooling water is provided by an external source. The outlet of the degassing tank of the vacuum degassing unit 8 is connected with the inlet of the homogenization unit 9.

[0081] The homogenization unit 9 includes a homogenizer and corresponding pipelines. The outlet of the homogenizer of the homogenization unit 9 is connected with the inlet of the sterilization unit 10.

[0082] The sterilization unit 10 is specifically an ultra-high temperature sterilization device, includes a tube heat exchanger, and is provided with a balance cylinder, and has an independent CIP cleaning and SIP sterilization and disinfection system. The outlet of the tube heat exchanger of the sterilization unit 10 is connected with the inlet of the sterile filling unit 11.

[0083] Aseptic filling unit 11: including aseptic paper package filling machine, specifically can be the commonly used sterilization filling equipment.

[0084] Process embodiment 1

[0085] This process embodiment is to produce sterilized milk by using the production and processing system provided in embodiment 1 to reduce the acidity of high-protein sterilized milk. The specific steps include:

[0086] 1. Collect raw milk using the milk collection unit, and perform preliminary temperature control at 6℃ to obtain the milk feed liquid;

[0087] 2. Input the temperature-controlled milk feed liquid into the filtration unit to perform filtration using a double filter with a mesh size of 60-80;

[0088] 3. Input the filtered milk feed liquid into the cooling storage unit to rapidly reduce the milk temperature to 4℃, and store it at this temperature;

[0089] 4. Input the stored milk feed liquid into the separation and defatting unit to perform defatting separation to obtain skim milk and cream, and the fat content of the skim milk is less than 0.05%, and the defatting separation is performed at 61℃;

[0090] 5. Input the skim milk into the chromatography extraction unit to remove phosphates and citrates, and the specific operation includes: before chromatography extraction sampling, flush the chromatography column with pure water at a temperature of 10℃, and then flush the chromatography column with a phosphate buffer at a temperature of 11℃; then flush the chromatography column with pure water at a temperature of 10℃; during chromatography extraction, control the temperature of the skim milk to be 61℃, and sample into the chromatography column for 5 hours;

[0091] 6. Input the cream and the skim milk after chromatography extraction into the mixing and homogenizing unit to perform mixing and then homogenization, and the homogenization temperature is 50-65℃, and the homogenization pressure uses secondary homogenization 20 / 100±5bar;

[0092] 7. Input the homogenized milk feed liquid into the flash evaporation unit to perform flash evaporation degassing to remove CO2, wherein the flash evaporation temperature is 58℃, the flash evaporation time is 5 minutes, and the milk does not undergo secondary flash evaporation;

[0093] 8. Input the milk feed liquid after flash evaporation degassing into the cooling unit to cool to 1-8℃;

[0094] 9. Input the cooled milk feed liquid into the vacuum degassing unit to perform vacuum degassing, and the degassing temperature is 50-65℃, and the degassing vacuum degree is -0.35bar to -0.80bar;

[0095] 10. Input the milk feed liquid after vacuum degassing into the homogenization unit to perform secondary homogenization, and the homogenization temperature is 60-70℃, and the homogenization pressure is 30 / 180bar;

[0096] 11. The milk solution after secondary homogenization is input into a sterilization unit for ultra-high temperature sterilization at 138±1℃ / 4s;

[0097] 12. The sterilized milk solution is input into a sterile filling unit for sterile filling at a filling temperature of 20-30℃ to obtain sterilized milk.

[0098] Process embodiment 2

[0099] This process embodiment is to produce sterilized milk by using the production and processing system for reducing the acidity of high-protein sterilized milk provided in embodiment 1, and the specific steps include:

[0100] 1. Fresh milk is collected by using a milk collection unit, and preliminary temperature control is performed at 6℃ to obtain a milk solution;

[0101] 2. The temperature-controlled milk solution is input into a filtration unit for filtration by using a double filter with a mesh size of 60-80;

[0102] 3. The filtered milk solution is input into a cooling storage unit to rapidly reduce the temperature of the milk to 4℃, and the milk is stored at this temperature;

[0103] 4. The stored milk solution is input into a separation and defatting unit for defatting separation to obtain skim milk and cream, and the fat content of the skim milk is less than 0.05%, and the defatting separation is performed at 62℃;

[0104] 5. The skim milk is input into a chromatography extraction unit to remove phosphates and citrates, and the specific operation includes: before chromatography extraction sampling, the chromatography column is rinsed with pure water at a temperature of 10℃, and then rinsed with a phosphate buffer at a temperature of 11℃; and then the chromatography column is rinsed with pure water at a temperature of 10℃; during the chromatography extraction process, the temperature of the skim milk is controlled at 52℃, and the sampling into the chromatography column is performed for 6 hours;

[0105] 6. The cream, the skim milk after chromatography extraction, is input into a mixing and homogenizing unit for mixing and then homogenizing, and the homogenizing temperature is 50-65℃, and the homogenizing pressure is two-stage homogenization at 20 / 100±5bar;

[0106] 7. The homogenized milk solution is input into a flash evaporation unit for flash evaporation degassing to remove CO2, wherein the flash evaporation temperature is 56℃, the flash evaporation time is 5 minutes, and the milk is not subjected to secondary flash evaporation;

[0107] 8. The milk solution after flash evaporation degassing is input into a cooling unit for cooling to 1-8℃;

[0108] 9. The cooled milk feed is input into a vacuum degassing unit for vacuum degassing, the degassing temperature is 50-65℃, the degassing vacuum degree is -0.35bar to -0.80bar;

[0109] 10. The vacuum degassed milk feed is input into a homogenization unit for secondary homogenization, the homogenization temperature is 60-70℃, the homogenization pressure is 40 / 200bar;

[0110] 11. The secondary homogenized milk feed is input into a sterilization unit for ultra-high temperature sterilization of 138±1℃ / 4s;

[0111] 12. The sterilized milk feed is input into a sterile filling unit for sterile filling, the filling temperature is 20-30℃, to obtain sterilized milk.

[0112] Process Example 3

[0113] This process example is to produce sterilized milk by using the production and processing system for reducing the acidity of high-protein sterilized milk provided in Example 1, the specific steps include:

[0114] 1. Fresh milk is collected by using a milk collection unit, and at the same time, preliminary temperature control is performed, the control temperature is 6℃, to obtain a milk feed;

[0115] 2. The temperature-controlled milk feed is input into a filtration unit for filtration by using a double filter with a mesh size of 60-80;

[0116] 3. The filtered milk feed is input into a cooling storage unit to rapidly reduce the temperature of the milk to 4℃, and the milk is stored at this temperature;

[0117] 4. The stored milk feed is input into a separation and defatting unit for defatting separation to obtain skim milk and cream, the fat content of the skim milk is less than 0.05%, and the defatting separation is performed at 57℃;

[0118] 5. The skim milk is input into a chromatography extraction unit to remove phosphates and citrates, the specific operation includes: before chromatography extraction sampling, the chromatography column is rinsed with pure water at a temperature of 12℃, and then rinsed with a phosphate buffer at a temperature of 10℃; then the chromatography column is rinsed with pure water at a temperature of 12℃; during the chromatography extraction process, the temperature of the skim milk is controlled to be 48℃, and the sampling into the chromatography column is performed for 7 hours;

[0119] 6. The cream, the skim milk after chromatography extraction, is input into a mixing and homogenization unit for mixing and then homogenization, the homogenization temperature is 62℃, and the homogenization pressure is two-stage homogenization 20 / 100±5bar;

[0120] 7. The homogenized milk solution is input into a flash unit for flash degassing to remove CO2, wherein the flash temperature is 58°C, the flash time is 5 minutes, and the milk is not subjected to secondary flash;

[0121] 8. The flash degassed milk solution is input into a cooling unit for cooling to 6°C;

[0122] 9. The cooled milk solution is input into a vacuum degassing unit for vacuum degassing, wherein the degassing temperature is 63°C, and the degassing vacuum degree is -0.55 bar;

[0123] 10. The vacuum degassed milk solution is input into a homogenization unit for secondary homogenization, wherein the homogenization temperature is 70°C, and the homogenization pressure is 40 / 200 bar;

[0124] 11. The secondary homogenized milk solution is input into a sterilization unit for ultra-high temperature sterilization at 138±1°C / 4s;

[0125] 12. The sterilized milk solution is input into a sterile filling unit for sterile filling at a filling temperature of 20-30°C to obtain sterilized milk.

[0126] Comparative Example 1

[0127] The present comparative example provides a production process of long shelf life sterilized milk, which is a conventional production process in the art and is performed using conventional production equipment, and specifically includes the following steps:

[0128] The raw milk is subjected to cleaning treatment using a milk cleaner;

[0129] The cleaned solution is subjected to pre-sterilization in a plate sterilizer at a sterilization temperature of 85-90°C for 15s;

[0130] The pre-sterilized solution is subjected to cooling storage at 0-6°C in a solution storage tank;

[0131] The cooled and stored solution is preheated to about 65°C, and then input into a homogenizer for homogenization at a homogenization pressure of 18-20 MPa;

[0132] The homogenized solution is sterilized using an ultra-high temperature sterilization device at a sterilization temperature of 137-140°C for 4s;

[0133] The sterilized solution is cooled to about 25°C, and then subjected to sterile filling using a sterile filling machine to obtain long shelf life sterilized milk.

[0134] Comparative Example 2

[0135] The production process of the long shelf life sterilized milk is carried out by using the equipment and method of example 1 of CN108142563A.

[0136] Test example

[0137] The product properties obtained by process examples 1-3 and comparative examples 1-2 are compared, and specifically shown in Tables 1 and 2.

[0138] Table 1 Carbon dioxide detection results

[0139]

[0140] Table 2 Titration acidity detection results

[0141]

[0142] According to the above comparison, it can be seen that the production of sterilized milk by using the production and processing system for reducing the acidity of high-protein sterilized milk of the present application can significantly reduce the acidity of the sterilized milk product.

Claims

1. A production and processing system for reducing the acidity of high-protein sterilized lactic acid, characterized in that: The production and processing system for reducing the acidity of high-protein sterilized lactic acid comprises a filtration unit (1), a cooling and storage unit (2), a separation and degreasing unit (3), a chromatography extraction unit (4), a mixing and homogenizing unit (5), a flash evaporation unit (6), a cooling unit (7), a vacuum degassing unit (8), a homogenizing unit (9), a sterilization unit (10), and an aseptic filling unit (11), which are connected in sequence. Wherein, the chromatographic extraction unit (4) comprises a chromatographic extraction column.

2. The production and processing system for reducing the acidity of high-protein sterilized lactic acid according to claim 1, characterized in that: The chromatographic extraction column has a height of 2-2.5 meters and a diameter of 50-60 centimeters.

3. The production and processing system for reducing the acidity of high-protein sterilized lactic acid according to claim 1 or 2, characterized in that: The chromatography extraction unit (4) comprises a feed pipeline and a discharge pipeline; Wherein, the feed pipeline connects the skimmed milk outlet of the separation and degreasing unit (3) and the inlet of the chromatographic extraction column; The discharge pipeline connects the outlet of the chromatography extraction column and the inlet of the mixing and homogenizing unit (5).

4. The production and processing system for reducing the acidity of high-protein sterilized lactic acid according to claim 1 or 2, characterized in that: The chromatography extraction unit (4) comprises a cleaning liquid storage tank and a cleaning pipeline; The cleaning pipeline connects the cleaning liquid storage tank and the chromatography extraction column to form a loop.

5. The production and processing system for reducing the acidity of high-protein sterilized lactic acid according to claim 1, characterized in that: The flash unit (6) comprises at least one flash tower, wherein the flash tower has a height of 3-5 meters and a diameter of 0.8-1.5 meters.

6. The production and processing system for reducing the acidity of high-protein sterilized lactic acid according to claim 5, characterized in that: The flash unit (6) comprises a single-stage flash tower or a multi-stage flash tower.

7. The production and processing system for reducing the acidity of high-protein sterilized lactic acid according to claim 5 or 6, characterized in that: The flash tower is provided with a heater (61), a vacuum pump (62), a material circulation pump (63), a temperature sensor (64), a pressure sensor (65), a gas-liquid separation chamber (66), a condensation chamber (67), an evaporator (68), a condensed water recovery pump (69), a steam pipeline (610), and a condensed water pipeline (611), wherein: The heater (61) is provided with a top inlet, a bottom outlet and a circulation inlet; the top inlet of the heater (61) is used to input milk liquid to be flash evaporated, and the bottom outlet is connected to the inlet of the material circulation pump (63) for outputting the flash evaporated milk liquid; The evaporator (68) is connected between the heater (61) and the gas-liquid separation chamber (66); The gas-liquid separation chamber (66) is provided with a gas outlet and a liquid outlet, wherein the gas outlet is connected to the circulation inlet of the heater (61) and the inlet of the condensation chamber (67) respectively, and the liquid outlet is connected to the inlet of the material circulation pump (63); The outlet of the condensation chamber (67) is connected to the condensation water pipeline (611), and a recovery pump (69) is provided on the condensation water pipeline (611). The condensation chamber (67) is also connected to a vacuum pump (62). The outlet of the material circulation pump (63) is connected to the inlet of the cooling unit (7); The bottom outlet of the gas-liquid separation chamber (66) is connected to the inlet of the material circulation pump (63); the outlet of the condensation chamber (67) is connected to the inlet of the vacuum pump (62); a temperature sensor (64) and a pressure sensor (65) are provided at the bottom of the heater (61); The flash unit (6) is further provided with a steam pipeline (610) for providing heat to the heater (61) and the condensation chamber (67).

8. The production and processing system for reducing the acidity of high-protein sterilized lactic acid according to claim 7, characterized in that: The heater (61) is a single-effect falling film evaporator.

9. The production and processing system for reducing the acidity of high-protein sterilized lactic acid according to claim 1, characterized in that: The sterilization unit (10) comprises an ultra-high temperature sterilization device.

10. The production and processing system for reducing the acidity of high-protein sterilized lactic acid according to claim 1, characterized in that: The mixing and homogenizing unit (5) comprises a skim milk inlet and a cream inlet, wherein the skim milk inlet is connected to the outlet of the chromatographic extraction unit (4), and the cream inlet is connected to the cream outlet of the separation and skimming unit (3).

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