Efficient pectin extraction method based on crop straw lignin

Abstract

The invention discloses a high-efficiency pectin extraction method based on crop straw lignin, and belongs to the technical field of pectin processing, and the method specifically comprises the following steps: putting crushed straw fibers into a pretreatment reaction kettle; the rotary screen plate rotates; the steam pipe and the steam nozzle jet at high speed; a pressure release valve is triggered to release pressure; the straw fibers enter an acid extraction reaction kettle, acid liquor is atomized and sprayed out through an acid spraying tank and an acid spraying nozzle, and materials in the acid extraction reaction kettle are mixed and stirred by a stirrer; through a bipolar reaction mode of the pretreatment reaction kettle and the acid extraction reaction kettle, the problems that straw fibers are wound and are difficult to mix, a lignin barrier is difficult to break and remove and pectin degradation is difficult to control are avoided, so that the aims of high pectin extraction efficiency, low energy consumption and high product purity can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pectin processing, and particularly relates to a method for efficiently extracting pectin based on lignin in crop straws. Background Art

[0002] As a natural food additive, the market demand for pectin has been increasing year by year. Crop straws (such as corn stalks and wheat stalks) are rich in pectin and are emerging raw materials to replace citrus peels.

[0003] Currently, the industrial extraction mainly uses acid leaching method, which releases pectin by hydrolyzing calcium bridge bonds and glycosidic bonds in plant cell walls under acidic conditions. However, when dealing with straws with high lignin content and dense fibers, this process has bottleneck problems such as low extraction efficiency, high energy consumption, and poor product purity. Therefore, there is a need to provide a method for efficiently extracting pectin based on lignin in crop straws to solve the above technical problems. Summary of the Invention

[0004] To solve the problems raised in the above background art, the present invention provides a method for efficiently extracting pectin based on lignin in crop straws, which has the characteristics of high extraction efficiency, low energy consumption, and high product purity.

[0005] To achieve the above object, the present invention provides the following technical solution: A method for efficiently extracting pectin based on lignin in crop straws, comprising the following steps: S1. After being conveyed by a screw conveyor, the crushed straw fibers are put into the pretreatment reactor. S2. While the straw fibers fall on the rotating screen plate, the rotating screen plate rotates, and during the rotation of the rotating screen plate, the straw fibers can be evenly spread on the rotating screen plate. S3. Start the steam supply device, and make 0.5 MPa saturated steam spray at high speed through the steam pipe and steam nozzle to form a dense steam jet to impact the surface of the straw fibers. The high-temperature steam quickly penetrates the straw fibers, softens the lignin, decomposes the pectin, and weakens the structural strength of the cell wall. S4. After maintaining 0.5 MPa saturated steam for the set time, trigger the pressure relief valve to quickly relieve the pressure inside the pretreatment reactor to atmospheric pressure. When the pressure is suddenly released, the steam inside the straw fibers instantaneously flashes into gas, generating an explosive expansion force, forcing the cell wall structure to rupture and forming micron-sized cracks. S5. Start the gate valve on the discharge pipe to connect the pretreatment reactor and the acid extraction reactor. The liquid and fine residues in the pretreatment reactor enter the acid extraction reactor through the mesh holes on the rotating screen plate via the discharge pipe. And during the rotation of the rotating screen plate relative to the scraper, the scraper cleans the straw fibers on the rotating screen plate. S6, start the piezoelectric vibrator, and output 40kHz ultrasonic wave and 50Hz mechanical vibration at the same time. The ultrasonic cavitation effect destroys the residue adhesion layer, and the mechanical vibration makes the residue fluidized and slide into the mesh, so that the liquid and the residue slide into the acid extraction reactor; S7, start the high-pressure supply device to make the high-pressure nozzle and the high-pressure nozzle blow out high-pressure gas. During the rotation of the rotating screen plate, the high-pressure gas can pass through the mesh holes on the rotating screen plate to further clean the residue on the rotating screen plate; S8, start the acid supply equipment to make the 85℃ acid liquid spray out through the acid spray tank and the acid spray nozzle; S9, start the agitator in the acid extraction reactor to mix and stir the materials in the acid extraction reactor, so that the acid liquid is fully in contact with the straw fiber, shorten the path for the acid liquid to diffuse into the fiber, form a liquid containing pectin, and subsequently purify the liquid containing pectin.

[0006] Preferably, the extraction equipment based on the efficient extraction method of lignin pectin from crop straw comprises a pretreatment reactor and an acid extraction reactor, wherein a discharge pipe is fixedly connected to the bottom of the pretreatment reactor, the other end of the discharge pipe is fixedly connected to the acid extraction reactor, and a discharge pipe is fixedly connected to the bottom of the acid extraction reactor; A rotating mesh plate is rotatably connected in the pretreatment reactor, a steam pipe is fixedly connected above the rotating mesh plate in the pretreatment reactor, steam nozzles are arranged circumferentially on the steam pipe, and a pressure relief valve is fixedly connected to one side of the pretreatment reactor; An acid spray pipe is fixedly connected in the acid extraction reactor, an acid spray nozzle is fixedly connected to the acid spray pipe, and a stirrer is rotatably connected in the acid extraction reactor.

[0007] Preferably, gate valves are provided on both the discharge pipe and the outlet pipe.

[0008] Preferably, a support frame fixedly connected to the inner wall of the pretreatment reactor is provided below the rotating mesh plate, a driving shaft is rotatably connected to the support frame, one end of the driving shaft is fixedly connected to the rotating mesh plate, the other end of the driving shaft is transmission-connected to a rotating shaft rotatably connected in the pretreatment reactor, the other end of the rotating shaft extends to the outside of the pretreatment reactor and is rotationally connected to the pretreatment reactor, and the rotating shaft is transmission-connected to the first reduction motor on the pretreatment reactor.

[0009] Preferably, a hole cleaning mechanism is provided below the filter screen plate, and the hole cleaning mechanism includes a fixed plate and a high-pressure pipe, the fixed plate is fixedly connected to the inner wall of the pretreatment reactor, a high-pressure nozzle is fixedly connected inside the fixed plate, and a high-pressure nozzle extending to the outside of the fixed plate is fixedly connected to the high-pressure nozzle.

[0010] Preferably, a scraping mechanism is provided above the filter screen plate. The scraping mechanism includes a scraper and a piezoelectric vibrator. Both ends of the scraper are connected to the pretreatment reactor through connecting frames. A tooth tip is fixedly connected to one side of the scraper, and a piezoelectric vibrator is fixedly connected to the other side of the scraper.

[0011] Preferably, the connecting frame includes an installation box which is fixedly connected to the outer wall of the pretreatment reactor. A moving plate is slidably connected in the installation box through a guide rail. One side of the moving plate is connected to an adjusting frame through a spring damper. One end of the moving plate passes through a movable slot provided on the pretreatment reactor and is fixedly connected to a connecting plate, and the connecting plate is fixedly connected to the scraper.

[0012] Preferably, the adjusting frame includes an adjusting disc and an adjusting bolt. The adjusting disc is fixedly connected to one end of the spring damper. The adjusting bolt is threadedly connected to the installation box, and the other end of the adjusting bolt is rotatably connected to the adjusting disc.

[0013] Preferably, sealing sheets are fixedly connected to both sides of the connecting plate where the moving plate is located. A sealing gasket is fixedly connected to one side of the sealing sheet facing the pretreatment reactor, and the sealing gasket is arranged in a fitting manner with the outer surface of the pretreatment reactor.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By adopting the bipolar reaction mode of the pretreatment reactor and the acid extraction reactor provided in the present invention, problems such as difficult entanglement and mixing of straw fibers, difficult breaking of the lignin barrier, and difficult control of pectin degradation are avoided, so that the purposes of high pectin extraction efficiency, low energy consumption, and high product purity can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings are used to provide further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a three-dimensional sectional structure schematic diagram of the present invention; Figure 2 is a sectional structure schematic diagram of the pretreatment reactor of the present invention; Figure 3 is of the present invention Figure 2 an enlarged structure schematic diagram at A in; Figure 4 is of the present invention Figure 2 an enlarged structure schematic diagram at B in; Figure 5 is a sectional structure schematic diagram of the acid extraction reactor of the present invention; In the figure: 1. Pretreatment reactor; 2. Acid extraction reactor; 3. Discharge pipe; 4. Outlet pipe; 5. Rotary screen plate; 6. Steam pipe; 7. Steam nozzle; 8. Pressure relief valve; 9. Acid spraying pipe; 10. Acid spraying nozzle; 11. Stirrer; 12. Support frame; 13. Rotary shaft; 14. Fixed plate; 15. High-pressure spray pipe; 16. High-pressure nozzle; 17. Scraper; 18. Tooth tip; 19. Piezoelectric vibrator; 20. Installation box; 21. Moving plate; 22. Spring damper; 23. Connecting plate; 24. Adjusting disc; 25. Adjusting bolt; 26. Sealing piece. Detailed implementation manners

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] Embodiment 1 Please refer to Figures 1-5 , this embodiment provides the following technical solutions: A method for efficiently extracting pectin based on lignin in crop straws, comprising the following steps: S1. After being conveyed by a screw conveying device, the crushed straw fibers are put into the interior of the pretreatment reactor 1; S2. While the straw fibers fall on the rotary screen plate 5, the rotary screen plate 5 rotates, and during the rotation of the rotary screen plate 5, the straw fibers can be evenly spread on the rotary screen plate 5; S3. Start the steam supply device, and make 0.5 MPa saturated steam be sprayed at high speed through the steam pipe 6 and the steam nozzle 7 to form a dense steam jet to impact the surface of the straw fibers. The high-temperature steam quickly penetrates the straw fibers, softens the lignin, decomposes the pectin, and weakens the structural strength of the cell wall; S4. After the 0.5 MPa saturated steam is maintained for the set time, trigger the pressure relief valve 8 to quickly relieve the pressure inside the pretreatment reactor 1 to the atmospheric pressure state. When the pressure is suddenly released, the steam inside the straw fibers instantaneously flashes into gas, generating an explosive expansion force, forcing the cell wall structure to rupture and forming micron-sized cracks; S5. Start the gate valve on the discharge pipe 3 to make the pretreatment reactor 1 and the acid extraction reactor 2 in a communicating state. The liquid and fine residues in the pretreatment reactor 1 enter the interior of the acid extraction reactor 2 through the mesh holes on the rotary screen plate 5 through the discharge pipe 3, and during the rotation of the rotary screen plate 5 relative to the scraper 17, the scraper 17 cleans the straw fibers on the rotary screen plate 5; S6, start the piezoelectric vibrator 19, and output 40kHz ultrasonic wave and 50Hz mechanical vibration at the same time. The ultrasonic cavitation effect destroys the residue adhesion layer, and the mechanical vibration makes the residue fluidized and slide into the mesh, so that the liquid and the residue slide into the acid extraction reactor 2; S7, start the high-pressure supply device to make the high-pressure nozzle 15 and the high-pressure nozzle 16 blow out high-pressure gas. During the rotation of the rotating screen plate 5, the high-pressure gas can pass through the mesh holes on the rotating screen plate 5 to further clean the residue on the rotating screen plate 5; S8, start the acid supply equipment to make the 85°C acid solution spray out through the acid spray tank and the acid spray nozzle 10; S9, start the stirrer 11 in the acid extraction reactor 2, so that the stirrer 11 mixes and stirs the materials in the acid extraction reactor 2, so that the acid liquid is fully in contact with the straw fiber, shortening the path for the acid liquid to diffuse into the fiber, forming a liquid containing pectin, and subsequently purifying the liquid containing pectin.

[0018] By adopting the bipolar reaction mode of the pretreatment reactor 1 and the acid extraction reactor 2, the problems of straw fiber entanglement and difficulty in mixing, lignin barrier and difficulty in breaking, and pectin degradation are avoided, so that the purpose of high pectin extraction efficiency, low energy consumption and high product purity can be achieved. Example 2 The extraction equipment based on the efficient extraction method of lignin pectin from crop straw includes a pretreatment reactor 1 and an acid extraction reactor 2. A discharge pipe 3 is fixedly connected to the bottom of the pretreatment reactor 1, and a gate valve is arranged in the discharge pipe 3. In some embodiments, a feed port is arranged on one side of the pretreatment reactor 1, which can be connected to the discharge end of a screw conveying device. Under the action of the screw conveying device, the crushed straw fiber is transported to the interior of the pretreatment reactor 1.

[0019] A rotating mesh plate 5 is rotatably connected in the pretreatment reactor 1, and a support frame 12 fixedly connected to the inner wall of the pretreatment reactor 1 is arranged below the rotating mesh plate 5. A driving shaft is rotatably connected to the support frame 12, and the top of the driving shaft is fixedly connected to the rotating mesh plate 5, and the bottom end of the driving shaft is transmission-connected to a rotating shaft 13 rotatably connected in the pretreatment reactor 1. The other end of the rotating shaft 13 extends to the outside of the pretreatment reactor 1 and is rotationally connected to the pretreatment reactor 1. The rotating shaft 13 is transmission-connected to the first reduction motor on the pretreatment reactor 1. The reduction motor is used to rotate the rotating shaft 13 and the driving shaft, so that the rotating mesh plate 5 can be rotated in the pretreatment reactor 1, and when the straw fibers are unloaded, the straw fibers can be more evenly spread on the rotating mesh plate 5.

[0020] A steam pipe 6 is fixedly connected above the rotating mesh plate 5 in the pretreatment reactor 1. In some embodiments, the steam pipe 6 is arranged in the pretreatment reactor 1 in a vortex structure, and steam nozzles 7 are circumferentially distributed on the steam pipe 6. The steam supply device is started to allow 0.5 MPa saturated steam to be sprayed at high speed through the steam pipe 6 and the steam nozzle 7, forming a dense steam jet to impact the surface of the straw fiber. The high-temperature steam quickly penetrates the straw fiber, softens the lignin, decomposes the pectin, and weakens the structural strength of the cell wall.

[0021] A pressure relief valve 8 is fixedly connected to one side of the pretreatment reactor 1. Through the set pressure relief valve 8, after the saturated steam of 0.5MPa is maintained for a set time, the pressure relief valve 8 is triggered to quickly release the pressure inside the pretreatment reactor 1 to a normal pressure state. When the pressure is suddenly released, the steam inside the straw fiber instantly flashes into gas, generating an explosive expansion force, forcing the cell wall structure to rupture and form micron-sized cracks.

[0022] The bottom end of the discharge pipe 3 is fixedly connected to the acid extraction reactor 2, and the bottom of the acid extraction reactor 2 is fixedly connected to the discharge pipe 4, and a gate valve is provided on the discharge pipe 4. Through the bipolar reaction mode of the pretreatment reactor 1 and the acid extraction reactor 2, the problems of straw fiber entanglement and difficulty in mixing, lignin barrier and difficulty in controlling pectin degradation are avoided, thereby achieving the purposes of high pectin extraction efficiency, low energy consumption and high product purity.

[0023] An acid spray pipe 9 is fixedly connected inside the acid extraction reactor 2. In some embodiments, the acid spray pipe 9 is arranged inside the acid extraction reactor 2 in a vortex structure, and an acid spray nozzle 10 is fixedly connected to the acid spray pipe 9. The acid supply equipment is started through the acid spray pipe 9 and the acid spray nozzle 10, so that the 85°C acid liquid is atomized and sprayed through the acid spray tank and the acid spray nozzle 10, so that the acid liquid is mixed with the straw fiber.

[0024] The acid extraction reactor 2 is rotatably connected with an agitator 11. In some embodiments, the agitator 11 is an anchor-type cutting agitator 11, and the agitator blades are inlaid with ceramic blades to forcibly cut off the entanglement of the straw fibers and facilitate the mixing of the acid solution and the straw fibers.

[0025] Example 3 Above the filter screen plate, there is a scraping mechanism. The scraping mechanism includes a scraping plate 17 and a piezoelectric vibrator 19. The left and right ends of the scraping plate 17 are connected to the pretreatment reactor 1 through connecting frames. On the front surface of the scraping plate 17, there are fixed tooth tips 18. On the back surface of the scraping plate 17, there is a fixed piezoelectric vibrator 19. By setting the scraping plate 17, during the rotation of the rotating screen plate 5, the residues on the filter screen plate can be discharged from the pretreatment reactor 1 through the mesh holes. By setting the piezoelectric vibrator 19, 40 kHz ultrasonic waves and 50 Hz mechanical vibrations are output simultaneously. The ultrasonic cavitation effect destroys the residue adhesion layer, and the mechanical vibration fluidizes the residues and slides them into the mesh holes, enabling the liquid and residues to slide into the acid extraction reactor 2.

[0026] The connecting frame includes an installation box 20. The installation box 20 is fixedly connected to the outer wall of the pretreatment reactor 1. Inside the installation box 20, there is a moving plate 21 slidably connected through a guide rail to limit the moving plate 21 in the vertical direction. The top of the moving plate 21 is connected to an adjusting frame through a spring damper 22. The bottom end of the spring damper 22 is fixedly connected to the moving plate 21. One end of the moving plate 21 passes through a movable slot provided on the pretreatment reactor 1 and is fixedly connected to a connecting plate 23. The connecting plate 23 is fixedly connected to the scraping plate 17. By setting the moving plate 21, the spring damper 22, and the connecting plate 23, a buffering effect can be achieved on the scraping plate 17, avoiding the transfer of resonance to the device when the scraping plate 17 vibrates and reducing the vibration transfer force.

[0027] The adjusting frame includes an adjusting disc 24 and an adjusting bolt 25. The adjusting disc 24 is fixedly connected to the top end of the spring damper 22. The adjusting bolt 25 is threadedly connected to the installation box 20, and the other end of the adjusting bolt 25 is rotatably connected to the adjusting disc 24. By setting the adjusting bolt 25 and the adjusting disc 24, the elastic pressure of the scraping plate 17 on the filter screen plate can be adjusted.

[0028] On both sides of the moving plate 21 on the connecting plate 23, there are fixedly connected sealing sheets 26. On the side of the sealing sheet 26 facing the pretreatment reactor 1, there is a fixedly connected sealing gasket, and the sealing gasket is arranged in contact with the outer surface of the pretreatment reactor 1. By setting the sealing sheets 26, during the up and down floating of the connecting plate 23 in the movable slot, the movable slot can be sealed to prevent the straw fibers from overflowing from the movable slot.

[0029] Example 4 A hole cleaning mechanism is arranged below the filter screen plate. The hole cleaning mechanism includes a fixing plate 14 and a high-pressure pipe. The fixing plate 14 is fixedly connected to the inner wall of the pretreatment reactor 1. A high-pressure spray pipe 15 is fixedly connected inside the fixing plate 14. A high-pressure nozzle 16 extending to the outside of the fixing plate 14 is fixedly connected to the high-pressure spray pipe 15. In some embodiments, during the rotation of the rotating screen plate 5, the high-pressure supply device is started to make the high-pressure spray pipe 15 and the high-pressure nozzle 16 blow out high-pressure gas. During the rotation of the rotating screen plate 5, the high-pressure gas can pass through the mesh holes on the rotating screen plate 5 to further clean the residues on the rotating screen plate 5.

[0030] The working principle of the present invention: S1. After being conveyed by the screw conveyor, the crushed straw fibers are put into the interior of the pretreatment reactor 1; S2. While the straw fibers fall on the rotating screen plate 5, the rotating screen plate 5 rotates. During the rotation of the rotating screen plate 5, the straw fibers can be evenly spread on the rotating screen plate 5; S3. The steam supply device is started to make 0.5 MPa saturated steam spray at high speed through the steam pipe 6 and the steam nozzle 7 to form a dense steam jet to impact the surface of the straw fibers. The high-temperature steam quickly penetrates the straw fibers to soften the lignin and decompose the pectin, weakening the structural strength of the cell wall; S4. After the 0.5 MPa saturated steam is maintained for the set time, the pressure relief valve 8 is triggered to quickly relieve the pressure inside the pretreatment reactor 1 to the atmospheric pressure state. When the pressure is suddenly released, the steam inside the straw fibers instantaneously flashes into gas, generating an explosive expansion force to force the cell wall structure to rupture, forming micron-sized cracks; S5. The gate valve on the discharge pipe 3 is started to make the pretreatment reactor 1 and the acid extraction reactor 2 in a communicating state. The liquid and fine residues in the pretreatment reactor 1 pass through the mesh holes on the rotating screen plate 5 and enter the interior of the acid extraction reactor 2 through the discharge pipe 3. And during the rotation of the rotating screen plate 5 relative to the scraper 17, the scraper 17 cleans the straw fibers on the rotating screen plate 5; S6. The piezoelectric vibrator 19 is started to output 40 kHz ultrasonic waves and 50 Hz mechanical vibrations at the same time. The ultrasonic cavitation effect destroys the residue adhesion layer, and the mechanical vibration fluidizes the residues and slides them into the mesh holes, making the liquid and residues slide into the interior of the acid extraction reactor 2; S7. The high-pressure supply device is started to make the high-pressure spray pipe 15 and the high-pressure nozzle 16 blow out high-pressure gas. During the rotation of the rotating screen plate 5, the high-pressure gas can pass through the mesh holes on the rotating screen plate 5 to further clean the residues on the rotating screen plate 5; S8. The acid supply device is started to make the 85 °C acid solution atomize and spray out through the acid spray tank and the acid spray nozzle 10; S9. Start the stirrer 11 in the acid extraction reactor 2 to mix and stir the materials in the acid extraction reactor 2, so that the acid solution is in full contact with the straw fiber, shorten the path for the acid solution to diffuse into the fiber interior, and form a liquid containing pectin.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for efficiently extracting pectin based on lignin from crop straws, characterized in that: It includes the following steps: S1. After being conveyed by a screw conveyor, the crushed straw fibers are put into the interior of a pretreatment reactor (1). S2. While the straw fibers fall onto a rotating screen plate (5), the rotating screen plate (5) rotates. During the rotation of the rotating screen plate (5), the straw fibers can be evenly spread on the rotating screen plate (5). S3. Start the steam supply device, and let 0.5 MPa saturated steam be sprayed at high speed through a steam pipe (6) and a steam nozzle (7) to form a dense steam jet to impact the surface of the straw fibers. The high-temperature steam quickly penetrates the straw fibers, softens the lignin, decomposes the pectin, and weakens the structural strength of the cell wall. S4. After maintaining 0.5 MPa saturated steam for the set time, trigger a pressure relief valve (8) to quickly relieve the pressure inside the pretreatment reactor (1) to atmospheric pressure. When the pressure is suddenly released, the steam inside the straw fibers instantly flashes into gas, generating an explosive expansion force that forces the cell wall structure to break and form micron-sized fissures. S5. Start the gate valve on the discharge pipe (3) to put the pretreatment reactor (1) and the acid extraction reactor (2) in communication. The liquid and fine residues in the pretreatment reactor (1) pass through the mesh holes on the rotating screen plate (5) and enter the interior of the acid extraction reactor (2) through the discharge pipe (3). And during the rotation of the rotating screen plate (5) relative to the scraper (17), the scraper (17) cleans the straw fibers on the rotating screen plate (5). S6. Start a piezoelectric vibrator (19) to output 40 kHz ultrasonic waves and 50 Hz mechanical vibrations at the same time. The ultrasonic cavitation effect destroys the residue adhesion layer, and the mechanical vibration fluidizes the residues and slides them into the mesh holes, enabling the liquid and residues to slide into the interior of the acid extraction reactor (2). S7. Start the high-pressure supply device to let a high-pressure nozzle (15) and a high-pressure nozzle (16) blow out high-pressure gas. During the rotation of the rotating screen plate (5), the high-pressure gas can pass through the mesh holes on the rotating screen plate (5) to further clean the residues on the rotating screen plate (5). S8. Start the acid supply device to atomize and spray 85 °C acid solution through an acid spraying tank and an acid spraying nozzle (10). S9. Start the stirrer (11) in the acid extraction reactor (2) to mix and stir the materials in the acid extraction reactor (2), enabling the acid solution to be in full contact with the straw fibers, shortening the path for the acid solution to diffuse into the fibers, forming a liquid containing pectin, and then purifying and processing the liquid containing pectin.

2. Extraction equipment for the efficient extraction of lignin pectin from crop straw, characterized in that: It includes a pretreatment reactor (1) and an acid extraction reactor (2). The bottom of the pretreatment reactor (1) is fixedly connected to a discharge pipe (3), the other end of the discharge pipe (3) is fixedly connected to the acid extraction reactor (2), and the bottom of the acid extraction reactor (2) is fixedly connected to a discharge pipe (4). A rotating mesh plate (5) is rotatably connected to the pretreatment reactor (1), a steam pipe (6) is fixedly connected to the pretreatment reactor (1) above the rotating mesh plate (5), steam nozzles (7) are arranged circumferentially on the steam pipe (6), and a pressure relief valve (8) is fixedly connected to one side of the pretreatment reactor (1); An acid spray pipe (9) is fixedly connected to the acid extraction reaction kettle (2), an acid spray nozzle (10) is fixedly connected to the acid spray pipe (9), and a stirrer (11) is rotatably connected to the acid extraction reaction kettle (2).

3. The extraction device for the efficient extraction method of lignin pectin from crop straws according to claim 2, characterized in that: The discharge pipe (3) and the outlet pipe (4) are both provided with gate valves.

4. The extraction device for the efficient extraction method of lignin pectin based on crop straw according to claim 2, characterized in that: A support frame (12) fixedly connected to the inner wall of the pretreatment reactor (1) is provided below the rotating mesh plate (5); a driving shaft is rotatably connected to the support frame (12); one end of the driving shaft is fixedly connected to the rotating mesh plate (5); the other end of the driving shaft is drivingly connected to a rotating shaft (13) rotatably connected inside the pretreatment reactor (1); the other end of the rotating shaft (13) extends to the outside of the pretreatment reactor (1) and is rotatably connected to the pretreatment reactor (1); the rotating shaft (13) is drivingly connected to a first reduction motor on the pretreatment reactor (1).

5. The extraction device for the efficient extraction method of lignin pectin from crop straw according to claim 2, characterized in that: A hole cleaning mechanism is provided below the filter screen plate, the hole cleaning mechanism comprising a fixed plate (14) and a high-pressure pipe, the fixed plate (14) being fixedly connected to the inner wall of the pretreatment reactor (1), a high-pressure nozzle (15) being fixedly connected inside the fixed plate (14), and a high-pressure nozzle (16) extending to the outside of the fixed plate (14) being fixedly connected to the high-pressure nozzle (15).

6. The extraction device for the efficient extraction method of lignin pectin from crop straw according to claim 2, characterized in that: A scraping mechanism is provided above the filter screen, the scraping mechanism comprising a scraper (17) and a piezoelectric vibrator (19), the two ends of the scraper (17) being connected to the pretreatment reactor (1) via a connecting frame, a tooth tip (18) being fixedly connected to one side of the scraper (17), and the piezoelectric vibrator (19) being fixedly connected to the other side of the scraper (17).

7. The extraction device for the efficient extraction method of lignin pectin from crop straw according to claim 6, characterized in that: The connecting frame comprises a mounting box (20), the mounting box (20) being fixedly connected to the outer wall of the pretreatment reactor (1), a movable plate (21) being slidably connected to the mounting box (20) via a guide rail, one side of the movable plate (21) being connected to an adjustment frame via a spring damper (22), one end of the movable plate (21) passing through a movable groove provided on the pretreatment reactor (1) and being fixedly connected to a connecting plate (23), the connecting plate (23) being fixedly connected to a scraper (17).

8. The extraction device for the efficient extraction method of lignin pectin from crop straw according to claim 7, characterized in that: The adjustment frame comprises an adjustment disk (24) and an adjustment bolt (25), wherein the adjustment disk (24) is fixedly connected to one end of the spring damper (22), the adjustment bolt (25) is threadedly connected to the mounting box (20), and the other end of the adjustment bolt (25) is rotatably connected to the adjustment disk (24).

9. The extraction device for the efficient extraction method of lignin pectin from crop straw according to claim 8, characterized in that: Sealing sheets (26) are fixedly connected to both sides of the moving plate (21) on the connecting plate (23). A sealing gasket is fixedly connected to one side of the sealing sheet (26) facing the pretreatment reactor (1), and the sealing gasket is arranged in a fitting manner with the outer surface of the pretreatment reactor (1).

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