A method and apparatus for preparing an antioxidant selenized carrageenan

Abstract

The application discloses a kind of preparation method and equipment of antioxidative selenized carrageenan, including fixed seat, rack, base, kettle body installed on base, heating layer is equipped in kettle body, main shaft is set in kettle body bottom, and kettle body bottom end is provided with motor transmission connection thereof;Main shaft is provided with stirring mechanism;Fixed seat is assembled on rack and is located above kettle body, first telescopic cylinder is set on fixed seat, piston rod of first telescopic cylinder extends to below fixed seat, and its end is rotatably connected with fixed frame, the bottom of fixed frame is provided with movable plate, the surface of movable plate is provided with a plurality of material barrels along its circumferential direction, to be used for containing algal material, and a plurality of through holes are distributed on the surface of material barrel;The application solves the problems of traditional equipment stirring dead angle, uneven contact of algal material and hot water, incomplete dissolution of carrageenan and additional filtration for algal residue separation, realizes efficient extraction of carrageenan, and improves the preparation quality and efficiency of selenized carrageenan.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of carrageenan production, in particular to a preparation method and equipment of selenium-modified antioxidant carrageenan. BACKGROUND

[0002] As a natural polysaccharide extracted from red algae, carrageenan is widely used in food, medicine, cosmetics and other fields due to its good gelation, stability and biocompatibility. Selenium-modified carrageenan not only retains the original properties, but also has excellent antioxidant activity. The increasing demand for functional foods and health products is driving the continuous upgrading of related preparation technologies.

[0003] At present, the preparation of selenium-modified carrageenan usually uses red algae as raw material, and is completed through steps such as algae material treatment, carrageenan extraction, selenium modification reaction and post-treatment. The efficient extraction of carrageenan is the core link to determine the yield and quality of the product. In the prior art, kettle-type equipment is often used for carrageenan extraction, which promotes the dissolution of carrageenan in algae material through heating and stirring. However, such equipment gradually exposes many deficiencies in practical application.

[0004] In terms of extraction efficiency, the stirring mechanism of the traditional equipment is mainly single radial stirring, which is easy to form a liquid flow dead angle in the kettle body, leading to uneven contact between hot water and algae material. Part of the algae material cannot be fully contacted with the extraction medium due to the dense accumulation, resulting in incomplete dissolution of carrageenan. In addition, the algae material in the existing equipment is directly placed in the kettle body, and the separation of algae residue and extraction liquid after extraction needs to rely on an additional filtration process, which not only increases the operation steps, but also may affect the purity of the subsequent selenium modification reaction due to the residual algae residue. SUMMARY

[0005] The purpose of the present application is to provide a preparation method and equipment of selenium-modified antioxidant carrageenan to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a preparation equipment of selenium-modified antioxidant carrageenan, comprising a fixed seat, a rack, a base, a kettle body mounted on the base, a heating layer arranged in the kettle body, a main shaft arranged at the bottom of the kettle body, and a motor in transmission connection with the bottom end of the kettle body; a stirring mechanism is arranged on the main shaft; the fixed seat is assembled on the rack and located above the kettle body, a first telescopic cylinder is arranged on the fixed seat, the piston rod of the first telescopic cylinder extends through the fixed seat to the lower side of the fixed seat, and a fixed frame is rotationally connected to the end of the piston rod, an activity plate is arranged at the bottom end of the fixed frame, a plurality of material cylinders are arranged along the circumferential direction of the activity plate, and the material cylinders are used for containing algae material, and a plurality of through holes are arranged on the surface of the material cylinders.

[0007] The upper surface of the main shaft is provided with a plurality of clamping grooves, the middle part of the movable plate is provided with a socket, and a clamping block corresponding to the clamping groove is arranged on the socket, so that when the first telescopic cylinder pushes the movable plate to move downward, the clamping block and the clamping groove are engaged to realize synchronous rotation of the main shaft and the movable plate.

[0008] Further, a plurality of flow stirrers are arranged on the inner bottom end of the kettle body along the circumferential direction, the flow stirrer has a circular truncated cone structure, and a plurality of arc-shaped flow stirring pieces are distributed on the surface of the flow stirrer, the rotating shaft of the flow stirrer extends through the bottom end of the kettle body, and a first gear is arranged on the rotating shaft, and a second gear is arranged on the bottom end of the main shaft, and the second gear is engaged with each first gear.

[0009] Further, the stirring mechanism comprises a plurality of stirring rods and stirring uniformity assemblies, the stirring rods are equidistantly distributed on the middle part of the main shaft, and a plurality of stirring uniformity assemblies are arranged on the upper and lower parts of the main shaft.

[0010] Further, the stirring uniformity pieces are arranged in an arc-shaped curved manner, and the curved directions of the stirring uniformity pieces on the upper and lower parts of the main shaft are opposite, so as to form a convection stirring effect.

[0011] Further, the pressing block and the pressing ring are connected through a supporting rod, the supporting rod comprises a first supporting rod and a second supporting rod, the first supporting rod is movably sleeved on the second supporting rod, and a spring is connected between the first supporting rod and the second supporting rod.

[0012] Further, the side ends of the pressing ring and the movable plate are embedded with sealing rings, and the top end of the main shaft has a chamfered guide structure; the material cylinder is detachably mounted on the movable plate.

[0013] The application also provides a preparation method of the antioxidant selenium-carrageenan preparation device, comprising the following steps:

[0014] S1, fresh red algae is selected, cut into 3cm-5cm pieces after washing, and uniformly loaded into the material cylinder;

[0015] S2, start the main shaft rotation, centrifugal dispersion of the material cylinder; the compression ring is pressed down to realize progressive extrusion; hot water of 60-70 DEG C is injected synchronously to promote the dissolution of carrageenan; when the extraction is finished, the first telescopic cylinder automatically lifts the movable plate to separate the material cylinder from the extraction liquid, and the compression ring remains stationary at this time; during the lifting of the movable plate, the compression block and the material cylinder move relatively to each other to implement secondary extrusion on the algal residue, and ensure that the residual extraction liquid is completely discharged;

[0016] S3, the extraction liquid in the kettle body is taken out and filtered, and the suspended algal residue is concentrated to a suitable viscosity under a vacuum environment at 40-50 DEG C;

[0017] S4, the concentrated carrageenan liquid is transferred to a reaction kettle with stirring, nitrogen gas is used to replace air, and a selenium source solution is added dropwise to react;

[0018] S5, food-grade reducing agent (such as L-cysteine) is added to terminate the reaction; after dialysis and desalination, spray drying is adopted to obtain a powder with good fluidity.

[0019] Compared with the prior art, the beneficial effects of the present application are:

[0020] The present application adopts the combined action mechanism of rotating material cylinder + fluid impact + progressive extrusion, so that the algal material is always in a dynamic loose state, the hot water penetration is more sufficient, and the carrageenan dissolution rate is significantly improved; the linkage design of the flow breaker and the stirring mechanism breaks the limitation of traditional static extraction, avoids temperature and concentration stratification through forced convection, and ensures the uniformity of dissolution.

[0021] The present application takes into account the extraction efficiency and operational practicability, realizes precise control of the extraction process and maximization of resource utilization. The perforated structure of the material cylinder not only ensures bidirectional liquid penetration, but also effectively traps the algal material to avoid mixing with the extraction liquid and increase the subsequent processing burden. The detachable design further simplifies the algal residue cleaning process.

[0022] The cooperation structure of the compression block and the compression ring realizes the cooperation of rotation and pressing action through the sliding groove and the sliding block, and forms progressive flexible extrusion through the spring buffer design of the supporting rod piece, which not only prevents the algal residue from clogging the perforations, but also completes secondary extrusion during the lifting of the material cylinder, fully recovers the residual extraction liquid, and significantly improves the raw material utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure of the present application is shown in the figure;

[0024] Figure 2 The cross-sectional view of the present application is shown in the figure;

[0025] Figure 3 The Figure 2 The local enlarged view of A in the figure is shown in the figure;

[0026] Figure 4It is a material cylinder structure schematic diagram;

[0027] Figure 5 It is a stirrer structure schematic diagram;

[0028] Figure 6 It is a pressure ring structure schematic diagram;

[0029] Figure 7 It is a stirring mechanism structure schematic diagram.

[0030] In the figure, the fixed seat-1, the base-2, the kettle body-3, the main shaft-4, the motor-5, the first telescopic cylinder-6, the fixed frame-7, the movable plate-8, the material cylinder-9, the through hole-10, the clamping groove-11, the socket-12, the clamping block-13, the second telescopic cylinder-14, the pressure ring-15, the sliding groove-16, the sliding block-17, the pressing block-18, the stirrer-19, the arc-shaped stirring piece-20, the first gear-21, the second gear-22, the stirring rod-23, the first fixed frame-24, the second fixed frame-25, the stirring uniform piece-26, the first supporting rod-27, the second supporting rod-28, the spring-29. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] As Figures 1 to 7 shown, an antioxidant selenium-carrageenan preparation device includes a fixed seat 1, a rack, a base 2, a kettle body 3 mounted on the base 2, a heating layer arranged in the kettle body 3, a main shaft 4 arranged at the bottom of the kettle body 3, and a motor 5 arranged at the bottom end of the kettle body 3 and drivingly connected to the kettle body 3; the main shaft 4 is provided with a stirring mechanism; the fixed seat 1 is assembled on the rack and located above the kettle body 3, and the fixed seat 1 is provided with a first telescopic cylinder 6, the piston rod of the first telescopic cylinder 6 extends through the fixed seat 1 to below the fixed seat 1, and the end of the piston rod is rotatably connected to a fixed frame 7, and the bottom end of the fixed frame 7 is provided with a movable plate 8, and the movable plate 8 is provided with a plurality of material cylinders 9 along the circumferential direction of the movable plate 8, so as to hold algal materials, and the surface of the material cylinder 9 is provided with a plurality of through holes 10;

[0033] A plurality of clamping grooves 11 are formed on the upper surface of the main shaft 4, and a middle portion of the movable plate 8 is provided with a socket 12, and the socket 12 is provided with a clamping block 13 corresponding to the clamping groove 11, so that when the first telescopic cylinder 6 pushes the movable plate 8 to move downward, the clamping block 13 and the clamping groove 11 are engaged to realize the synchronous rotation of the main shaft 4 and the movable plate 8; The second telescopic cylinder 14 is arranged on both sides of the fixed seat 1, and the piston rod thereof extends to below the fixed seat 1, and the piston rods of the second telescopic cylinders 14 on both sides are connected by a pressing ring 15, and the top end of the pressing ring 15 is provided with a sliding groove 16, and the piston rod of the second telescopic cylinder 14 is provided with a sliding block 17, and the sliding block 17 is slidingly connected in the sliding groove 16, and the bottom end of the pressing ring 15 is provided with a plurality of pressing blocks 18 corresponding to the material cylinder 9, and the pressing blocks 18 extend into the material cylinder 9 and tightly fit with the inner wall thereof.

[0034] The material cylinder 9 is a cylindrical container, and the surface is uniformly distributed with through holes 10, which not only serves as a carrier for the algae material, but also allows liquid to penetrate in both directions. The aperture design of the through hole 10 allows hot water to freely penetrate into the cylinder to dissolve carrageenan in the algae material and prevent the leakage of algae material fragments, while ensuring that the extraction liquid can be smoothly discharged during extrusion; The hole position is gradient distributed (the density at the bottom is higher than that at the top), which optimizes the fluid impact effect; The main function is to realize the liquid-material interaction of hot water penetration and extraction liquid outflow through the through hole 10, and also rely on the interception effect of the through hole 10 to completely block the algae material from entering the hot water in the kettle body 3, avoiding the scattering of the algae material in the extraction liquid; Subsequently, only the material cylinder 9 needs to be taken out to clean the algae residue, without the need for additional filtration of a large amount of scattered algae, greatly simplifying the purification steps of the extraction liquid

[0035] After the main shaft 4 is started, the movable plate 8 and the material cylinder 9 are driven to rotate synchronously through the engagement of the clamping block 13 and the clamping groove 11, generating a centrifugal force to make the algae material uniformly adhere to the cylinder wall to form a loose annular layer; The centrifugal force simultaneously promotes the radial displacement of the algae material in the cylinder, avoiding the problem of central compaction caused by natural accumulation; The rotation of the material cylinder 9 continuously exposes the algae material to fresh hot water, avoiding local temperature decay and ensuring that each section of the algae material can contact hot water; The microcirculation channel formed by the structure of the through hole 10 shortens the diffusion path of the carrageenan molecules from the inside of the algae material to the extraction liquid.

[0036] In the initial state, the pressing block 18 is lifted away from the material cylinder 9 under the action of the second telescopic cylinder 14, so that the staff can add the algae material into the material cylinder 9. In the extraction process, first, the pressing block 18 is tightly attached to the inner wall of the material cylinder 9, and when the pressing ring 15 is pushed downward by the second telescopic cylinder 14, the algae material in the cylinder can be subjected to directional pressure. This pressure directly acts on the algae cells, forcing the extracted carrageenan extract in the cells to be discharged through the through hole 10 of the material cylinder 9, accelerating the separation of the extract and the algae residue, and avoiding the retention of the extract in the gap between the algae materials; the sliding block 17 cooperates with the sliding groove 16, and when the movable plate 8 rotates with the material cylinder 9, the pressing block 18 inserted into the material cylinder 9 is synchronously rotated due to the tight attachment to the cylinder wall. At this time, the sliding block 17 slides along the circumferential direction of the sliding groove 16, allowing the pressing ring 15 to rotate synchronously with the pressing block 18, and not affecting the upward and downward driving of the second telescopic cylinder 14 on the pressing ring 15.

[0037] When the extraction is completed and the movable plate 8 lifts the material cylinder 9 to leave the surface of the extract, the pressing block 18 remains stationary, and the relative movement of the two forms a "second extrusion". At this time, the algae residue has been loosened due to the previous extraction, and the pressing block 18 can more efficiently squeeze out the remaining trace of extract, further improving the total recovery rate. Throughout the process, the pressing block 18 is always attached to the inner wall of the material cylinder 9, and will not cause leakage of the algae material, perfectly adapting to the interception function of the material cylinder 9.

[0038] In the embodiment, a plurality of flow stirrers 19 are arranged at the bottom end of the kettle body 3 along the circumferential direction thereof. The flow stirrer 19 has a circular truncated cone structure, and a plurality of arc-shaped flow stirring pieces 20 are distributed on the surface thereof. The rotating shaft of the flow stirrer 19 extends through the bottom end of the kettle body 3, and a first gear 21 is sleeved on the rotating shaft. The bottom end of the main shaft 4 is sleeved with a second gear 22, and the second gear 22 is engaged with each first gear 21 for transmission. When the main shaft 4 rotates, all the flow stirrers 19 are synchronously rotated by the gear set without the need for additional power, thereby saving energy consumption.

[0039] The flow stirrer 19 has a circular truncated cone structure matched with arc-shaped flow stirring pieces 20. When rotating, the arc-shaped pieces can "disrupt" the flow direction of the liquid at the bottom of the kettle body 3, avoiding the deposition of the extract liquid at the kettle bottom. At the same time, the liquid is rolled upward, so that the hot water and the algae extract liquid are fully mixed, preventing local temperature and concentration from affecting the dissolution of carrageenan;

[0040] The material cylinder 9 rotates synchronously with the main shaft 4, and the bottom thereof continuously sweeps across the area directly above the flow agitator 19 (no contact in space, but very close distance); at this time, the upward flowing liquid flow of the flow agitator 19 directly impacts the bottom of the material cylinder 9, and the liquid penetrates into the cylinder through the through hole 10 of the material cylinder 9, while driving the algae in the cylinder to be slightly "up and down". The stirring caused by the impact can avoid the "local compaction" of the algae in the material cylinder 9 due to the centrifugal force or its own gravity; the algae is always in a loose state, ensuring that each part of the algae can be in full contact with hot water and extraction liquid, completely solving the potential problem of "insufficient contact of algae at the center of the material cylinder 9", and further improving the dissolution rate of carrageenan.

[0041] In the embodiment, the stirring mechanism includes a plurality of stirring rods 23 and stirring assemblies. The stirring rods 23 are equidistantly distributed in the middle part of the main shaft 4. The upper and lower parts of the main shaft 4 are provided with a plurality of stirring assemblies. The stirring assemblies include first and second fixed frames 247 and 257, which are fixedly connected to the surface of the main shaft 4, and a plurality of stirring fins 26 connected between the first and second fixed frames 247 and 257.

[0042] The equidistantly distributed stirring rods 23 in the middle part of the main shaft 4 rotate with the main shaft 4 to radially stir the extraction liquid in the middle layer of the kettle body 3, break the liquid stratification, and ensure that the hot water and the algae extraction liquid are quickly mixed. The first / second fixed frames 257 on the upper and lower parts of the main shaft 4 are used to fix the stirring fins 26 (to avoid deformation during high-speed rotation). The plurality of stirring fins 26 form a three-dimensional stirring net covering the upper and lower areas of the kettle body 3, supplementing the range not covered by the stirring rods 23, and achieving stirring of the whole kettle body 3.

[0043] In the embodiment, the stirring fins 26 are arranged in an arc shape, and the stirring fins 26 on the upper and lower parts of the main shaft 4 are arranged in opposite directions to form a convection stirring effect. The arc-shaped bending direction of the stirring fins 26 on the upper part of the main shaft 4 is completely opposite to that of the stirring fins 26 on the lower part. When rotating, the upper stirring fins 26 drive the liquid to flow downward, and the lower stirring fins 26 drive the liquid to flow upward, forming an upward and downward convection in the kettle body 3. The convection effect can break the natural stratification of the extraction liquid (hot water on the top and algae residue extraction liquid on the bottom), make the dissolution of carrageenan more uniform, and avoid insufficient local dissolution.

[0044] In the embodiment, the pressing block 18 and the pressing ring 15 are connected through a support member. The support member includes first and second support rods 27 and 28. The first support rod 27 is movably sleeved on the second support rod 28, and a spring 29 is connected between the first and second support rods 27 and 28. When the pressing ring 15 is pressed down, the spring 29 will be compressed first to buffer, avoiding the instantaneous hard pressing of the algae by the pressing block 18.

[0045] As the pressure ring 15 continues to move down, the spring 29 gradually releases the elastic force, and the pressure of the pressure block 18 on the algae material is "progressively increased": neither the algae residue is pressed to death to cause the permeation hole 10 to be blocked, nor the residual extraction liquid is squeezed out, and the "squeezing efficiency" and "material protection" are balanced

[0046] In the embodiment, the side ends of the pressure ring 15 and the movable plate 8 are embedded with sealing rings, which are embedded in the side ends of the pressure ring 15 and the movable plate 8 to prevent hot water or steam in the kettle body 3 from leaking from the gap, so as to ensure that the temperature and pressure in the kettle are stable (unstable temperature will affect the dissolution rate of carrageenan).

[0047] The top end of the main shaft 4 is a chamfered guide structure, and when the movable plate 8 moves down and is connected to the main shaft 4, the chamfer can guide the socket 12 to quickly align with the main shaft 4, so as to avoid the misalignment of the clamping block 13 and the clamping groove 11, and improve the smoothness of operation.

[0048] The material cylinder 9 is detachably installed on the movable plate 8, and after the extraction is completed, the material cylinder 9 can be directly removed for cleaning the algae residue, without the need for manual cleaning in the kettle body 3, thereby saving operation time.

[0049] The embodiment also provides a preparation method of an antioxidant seleniumized carrageenan preparation device, which comprises the following steps:

[0050] S1, fresh red algae is selected, cut into 3-5 cm pieces after washing, and uniformly loaded into the material cylinder 9; the number of the material cylinder 9 is configured according to the capacity of the kettle body 3 (usually 6-8, and the loading capacity of a single cylinder is 2-3 kg).

[0051] S2, the main shaft 4 is started to rotate, the material cylinder 9 is centrifugally dispersed with algae material; the pressure ring 15 is pressed down to realize progressive extrusion; 60-70 DEG C hot water is synchronously injected to promote the dissolution of carrageenan; when the extraction is completed, the first telescopic cylinder 6 automatically lifts the movable plate 8 to separate the material cylinder 9 from the extraction liquid, and at this time, the pressure ring 15 remains stationary; during the lifting of the movable plate 8, the pressure block 18 moves relative to the material cylinder 9 to implement secondary extrusion on the algae residue, so as to ensure that the residual extraction liquid is completely discharged.

[0052] S3, the extraction liquid in the kettle body 3 is taken out (an outlet valve is arranged at the bottom of the kettle body 3), and diatomite is used to filter and remove suspended algae residue; the concentrated carrageenan liquid is concentrated to a suitable viscosity under a vacuum environment at 40-50 DEG C, so as to avoid the breakage of molecular chains caused by high temperature.

[0053] S4, the concentrated carrageenan liquid is transferred to a reaction kettle with stirring, nitrogen gas is used to replace air, a selenium source (such as sodium selenite) is pre-dissolved in deionized water to avoid excessively high local concentration, the selenium source solution is added dropwise for reaction, and the pH value is maintained at 8.5-9.5; a program-controlled temperature is used (first activated at 60 DEG C for 2 hours, and then heated to 70 DEG C for deepening reaction).

[0054] S5, adding food-grade reducing agent to terminate the reaction; after dialysis and desalting, spray drying is adopted to obtain powder with good fluidity.

[0055] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified or some technical features can be replaced by equivalent features by those skilled in the art, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An apparatus for preparing antioxidant selenized carrageenan, characterized in that: The device includes a fixed base, a frame, a base, and a vessel body mounted on the base. The vessel body has a heating layer, a main shaft at the bottom of the vessel body, and a motor connected to the main shaft at the bottom of the vessel body. A stirring mechanism is mounted on the main shaft. The fixed base is mounted on the frame and located above the vessel body. A first telescopic cylinder is mounted on the fixed base. The piston rod of the first telescopic cylinder extends through to the bottom of the fixed base and is rotatably connected to a fixed frame at its end. A movable plate is mounted at the bottom of the fixed frame. Several material cylinders are arranged along the circumference of the movable plate for holding algae. Multiple through holes are distributed on the surface of the material cylinders. The upper surface of the main shaft is provided with several slots, and the middle of the movable plate is provided with an insertion port, and the insertion port is provided with a locking block corresponding to the slot. So when the first telescopic cylinder pushes the movable plate down, the locking block engages with the slot to realize the synchronous rotation of the main shaft and the movable plate. The fixed base is provided with a second telescopic cylinder on both sides, and its piston rod extends through to the bottom of the fixed base. A pressure ring is connected between the piston rods of the two second telescopic cylinders. The top of the pressure ring is provided with a sliding groove, and the end of the piston rod of the second telescopic cylinder is provided with a slider. The slider is slidably engaged in the sliding groove. The bottom of the pressure ring is provided with several pressure blocks corresponding to the material cylinder. The pressure blocks extend into the material cylinder and fit tightly against its inner wall. Several agitators are rotatably mounted on the bottom of the vessel body along its circumference. Each agitator has a frustum-shaped structure and several arc-shaped agitator blades distributed on its surface. The agitator's shaft extends through to the bottom of the vessel body, and a first gear is mounted on the shaft. A second gear is mounted on the bottom of the main shaft. The second gear meshes with each of the first gears to drive the material cylinder. The material cylinder rotates synchronously with the main shaft, and its bottom continuously sweeps over the area directly above the agitators. At this time, the upward flow of liquid from the agitators directly impacts the bottom of the material cylinder. The liquid seeps into the cylinder through the perforations, simultaneously causing the algae inside the cylinder to tumble up and down. It also includes its preparation method, comprising the following steps: S1. Select fresh red algae, wash them, cut them into 3cm-5cm pieces, and evenly pack them into the material container. S2. Start the main shaft to rotate, and the material cylinder centrifugally disperses the algae; the pressure ring presses down to achieve gradual extrusion; hot water at 60-70℃ is injected simultaneously to promote the dissolution of carrageenan; when the extraction is finished, the first telescopic cylinder automatically raises the movable plate, which drives the material cylinder to detach from the extract liquid, and the pressure ring remains stationary at this time; during the upward movement of the movable plate, the pressure block and the material cylinder generate relative motion, which performs secondary extrusion on the algae residue to ensure that the residual extract liquid is completely discharged; S3. Remove the extract from the vessel and filter it to remove suspended algae residue; concentrate it to a suitable viscosity under vacuum at 40-50℃. S4. Transfer the concentrated carrageenan solution to a stirred reactor, purge the air with nitrogen, and add selenium source solution dropwise to carry out the reaction. S5. Add a food-grade reducing agent to terminate the reaction; after dialysis and desalting, spray dry to obtain a free-flowing powder.

2. The apparatus for preparing antioxidant selenized carrageenan according to claim 1, characterized in that: The stirring mechanism includes several stirring rods and a mixing assembly. The stirring rods are equidistantly distributed in the middle of the main shaft. Several mixing assemblies are provided on both the upper and lower parts of the main shaft. Each mixing assembly includes a first fixed frame and a second fixed frame. The first fixed frame and the second fixed frame are fixedly connected to the surface of the main shaft, and several mixing blades are connected between the first fixed frame and the second fixed frame.

3. The apparatus for preparing antioxidant selenized carrageenan according to claim 2, characterized in that: The stirring blades are curved in an arc shape, and the upper and lower stirring blades of the main shaft are curved in opposite directions to create a convective stirring effect.

4. The apparatus for preparing antioxidant selenized carrageenan according to claim 1, characterized in that: The pressure block and the pressure ring are connected by a support rod, which includes a first support rod and a second support rod. The first support rod is movably sleeved on the second support rod, and a spring connects the first support rod and the second support rod.

5. The apparatus for preparing antioxidant selenized carrageenan according to claim 1, characterized in that: The pressure ring and the side end of the movable plate are both fitted with sealing rings, and the top end of the main shaft has a chamfered guide structure; the material cylinder is detachably installed on the movable plate.

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