Extraction device of olive pomace oil and combined preparation method of pomace oil and dietary fibers

Abstract

The invention discloses an extraction device of olive pomace oil and a combined preparation method of pomace oil and dietary fiber, the extraction device comprises: a reaction tank, which is divided into an extraction zone and a filtering zone; a stirring pipe; the push sealing plate is matched with the filtering area in size, a connecting rod is arranged at one end of the push sealing plate, and the top end of the connecting rod penetrates out of the stirring pipe to be connected with a second driving part. The extraction method comprises the following steps: adding a compound enzyme into a deep-eutectic solvent to form a conditioning agent, mixing the conditioning agent with the olive pomace for conditioning, then pulping and stirring, cracking the olive pomace to obtain olive pomace pulp, adding the conditioned olive pomace pulp into a solvent, and extracting the olive pomace oil and the degreased olive pomace. According to the method, cells of the olive pomace can be fully split by using composite enzymolysis and eutectic extraction in the tempering process, grease is promoted to be separated out, meanwhile, the filtering speed of a filtering piece is high, the extraction efficiency is high, dietary fibers with high water-soluble dietary content are further prepared from the extracted olive pomace, and the method has a good application prospect.

Description

Technical Field

[0001] The present invention relates to the field of olive pomace oil extraction, and more specifically, to an olive pomace oil extraction device and a method for jointly preparing pomace oil and dietary fiber. Background Art

[0002] Olive oil in my country is mainly virgin oil, and a large amount of pomace is produced during the processing. The pomace contains about 8% fat, about 25% fiber, and contains a large amount of active ingredients such as phenols. At present, pomace is mainly used as compost or feed, resulting in a waste of resources. In order to avoid the waste of olive pomace and improve the utilization rate of olive pomace, people have studied a variety of ways to extract pomace oil from olive pomace, which usually include: beating and tempering the olive pomace, then using an oil solvent to extract the oil in the tempered olive pomace, and finally separating the slag liquid, removing the solvent from the filtrate, and obtaining crudely extracted olive pomace oil. At present, many devices for extracting olive pomace oil have also been developed, but in the slag liquid separation stage, either centrifugal separation equipment is used for separation, or conventional filter cloth and gauze are used for filtration. When conventional gauze and filter cloth are used for filtration, the filtration speed is slow, resulting in low extraction efficiency. In addition, the existing de-oiled olive pomace is not effectively utilized, resulting in a waste of resources. Summary of the invention

[0003] An object of the present invention is to solve at least the above-mentioned problems and provide an olive pomace oil extraction device and a method for the joint preparation of pomace oil and dietary fiber, wherein the olive pomace oil extraction device can accelerate the filtration speed and improve the extraction efficiency of the pomace oil; the method for the joint preparation of pomace oil and dietary fiber conditions the olive pomace by a low eutectic solvent and a composite enzyme, thereby ultimately improving the extraction rate of the pomace oil and the yield of the dietary fiber, realizing the joint production process of the pomace oil and the dietary fiber, and also making effective use of the olive pomace.

[0004] In order to achieve these purposes and other advantages according to the present invention, there is provided an olive pomace oil extraction device, comprising:

[0005] The reaction tank is divided into an extraction zone and a filtration zone connected from top to bottom, the extraction zone and the filtration zone are coaxial and both are square, the length and width of the filtration zone are smaller than the length and width of the extraction zone, the top of the extraction zone is open and a cover plate is movably provided at the open position, a feed port is provided on the cover plate, and the bottom of the filtration zone is open and a filter element is provided inside;

[0006] A stirring tube, the bottom end of which rotates from the cover plate into the extraction area and the top end of which is located outside the cover plate;

[0007] A push-sealing plate is provided between the filter element and the stirring tube, the size of the push-sealing plate is adapted to the filtering area and a sealing layer is provided on the circumferential side wall of the push-sealing plate, a connecting rod is provided at one end of the push-sealing plate close to the extraction area, and the top end of the connecting rod coaxially passes through the stirring tube;

[0008] A first driving member, which drives the stirring tube to rotate;

[0009] A second driving member, whose driving end is detachably connected to the passing end of the connecting rod, so as to drive the connecting rod to rise and fall and thereby drive the pushing and sealing plate to reciprocate between the extraction area and the filtering area;

[0010] When the second driving member drives the push sealing plate to move upward into the extraction area, a unloading channel is formed between the push sealing plate and the inner wall of the extraction area; when the second driving member drives the push sealing plate to move to the filtering area, the push sealing plate isolates the extraction area from the filtering area; when the second driving member drives the push sealing plate to move downward along the inner wall of the filtering area, a pressurized space is formed between the push sealing plate and the filter element to accelerate the filtration.

[0011] Preferably, an inner cavity is formed inside the push-sealing plate, an inlet and a top opening are formed at the top of the inner cavity, a bottom opening is formed at the bottom of the inner cavity, the inlet, the bottom opening and the connecting rod are coaxial, the connecting rod slides through the inlet and extends into the inner cavity, the extending end of the connecting rod is coaxially connected to a sealing plate, and the diameter of the sealing plate is larger than the diameters of the bottom opening and the inlet;

[0012] Among them, when the push sealing plate is located in the filtration area, the second driving member drives the connecting rod to move in the inner cavity until the sealing plate abuts against the bottom of the inner cavity, and then drives the push sealing plate to continue to move downward to accelerate the filtration; when the second driving member drives the connecting rod to move upward in the inner cavity until the sealing plate contacts the top of the inner cavity, the extraction area is connected with the filtration area through the top opening, the inner cavity and the bottom opening. At this time, the connecting rod continues to move upward to drive the push sealing plate to move upward.

[0013] Preferably, the reaction tank also includes a collection area, which is arranged below the filtration area and is coaxial with the filtration area. The collection area is square in shape, the length and width of the collection area are both larger than the length and width of the filtration area, and the top of the collection area is transitionally connected to the bottom of the filtration area.

[0014] Preferably, a collecting trough is provided in the collecting area, and a first sealing door is provided on a side wall of the collecting area.

[0015] Preferably, the filter element comprises a frame plate and a filter medium laid in the frame plate, the frame plate is sealingly clamped on the inner wall of the filter area, and a second sealing door is opened on the side wall of the filter area to accommodate the filter element.

[0016] The combined preparation method of olive pomace oil and dietary fiber comprises the following steps:

[0017] S1, olive pomace conditioning: adding a conditioning agent to the olive pomace, then beating and ultrasonic conditioning to obtain olive pomace pulp; wherein the conditioning agent comprises a low eutectic solvent and a composite enzyme in a mass ratio of 1:2 to 1:4, the low eutectic solvent comprises an additive and water, the mass percentage of water in the low eutectic solvent is 20% to 50%, the additive comprises choline chloride and an additive in a molar ratio of 1:2 to 3:1, the additive is one of lactic acid, citric acid, glycerol, and ethylene glycol, the composite enzyme comprises cellulase, hemicellulase, xylanase, and laccase in a mass ratio of 1:2:2:1, and the addition amount of the composite enzyme is 0.3 to 0.8% of the mass of the olive pomace; the ultrasonic conditions are: 50°C, 0.5h to 2h, 250w;

[0018] S2. Extracting olive pomace oil using an olive pomace oil extraction device: Initially, the push sealing plate is located in the filtering area; the olive pomace slurry and the oil extraction solvent in S1 are sequentially added to the extraction area through the feed port, the first driving member is started, the stirring tube rotates, and after stirring and mixing for 60 to 90 minutes, sulfate is added through the feed port, and stirring is continued for 60 to 90 minutes to obtain a mixture;

[0019] S3, start the second driving member, move the connecting rod upward, drive the push plate to move upward to the extraction area, then the mixture in the extraction area enters the filter element through the discharge channel, the mixture is filtered by the filter element, the filtrate enters the collection area, and the filter residue remains on the filter element. When the unloading in the extraction area is completed, start the second driving member, drive the connecting rod downward, and then drive the push plate downward until the push plate is slidably sealed and connected with the inner wall of the filter area. At this time, continue to move the push plate downward, and a pressurized space is formed between the push plate and the filter element to accelerate the filtration;

[0020] S4, collecting pomace oil: opening the first sealed door, taking out the collecting tank, removing the oil extraction solvent in the filtrate in the collecting tank, and obtaining pomace oil;

[0021] S5, preparation of pomace dietary fiber: open the second sealed door, take out the filter element, obtain filter residue, remove the oil extraction solvent in the filter residue, and obtain treated filter residue; mix the filter residue with alkali solution at a mass ratio of 1:10-1:15, high-speed shear at 8000rpm-15000rpm for 10min, then place it at 40℃ and 150rpm for hydrolysis for 30min, adjust the pH to 7.0 and filter to obtain supernatant and precipitate, mix the supernatant with 95% ethanol at a volume ratio of 1:4-1:6, and precipitate under reduced pressure at 0℃-10℃ for 2-6h, the precipitate is water-soluble dietary fiber; mix the precipitate with the precipitate, ultrafine grind and sieve, so that the precipitate particle size after sieving is 150-200 mesh, and obtain olive dietary fiber; the alkali solution is 0.4-0.6g / 100mL NaOH solution.

[0022] The present invention has at least the following beneficial effects:

[0023] First, by designing a reaction tank, an extraction zone, a filtration zone, a cover plate, a feed port, a filter element, a stirring tube, a push-sealing plate, a sealing layer, a first driving element, a second driving element, a discharge channel, and a pressurized space, when in use, the push-sealing plate is initially located in the filtration zone and is sealed and slidably connected to the inner wall of the filtration zone. At this time, the push-sealing plate forms the bottom of the extraction zone to isolate the extraction zone from the filtration zone. At the same time, olive pomace pulp and oil extraction solvent are added to the extraction zone through the feed port, and then the first driving element is started, and the stirring tube rotates to stir and mix the cabbage pomace pulp and the oil extraction solvent, and then sulfate is added, and then Continue stirring and mixing to finally obtain a mixture. When unloading is required, a collecting tank is placed below the filtration area, and then the second driving member is started to drive the push sealing plate to move up to separate from the filtration area, and then the mixture enters the filtration area from the unloading channel. After the mixture is filtered by the filter element, the filtrate enters the collecting tank, and the filter residue remains on the filter element. When the filtration speed is slow, the second driving member is started again to make the push plate enter the filtration area, and then the push plate is slowly moved downward to form a pressurized space between the push plate and the filter element. The mixture above the filter element is quickly filtered under pressure, which improves the filtration speed and indirectly improves the extraction efficiency.

[0024] Second, a method for the joint preparation of olive pomace oil and dietary fiber is provided. The olive pomace is tempered by a low eutectic solvent and a composite enzyme, which can increase the degree of cell fragmentation in the olive pomace, promote the dissolution of the pomace oil, and improve the extraction rate of the pomace oil. The filtered residue after extracting the pomace oil can be further used to prepare dietary fiber. Overall, the utilization rate of the olive pomace is improved, the olive pomace is effectively utilized, and it has good application prospects.

[0025] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the front view of the structure of the olive pomace oil extraction device according to one of the technical solutions of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the olive pomace oil extraction device during unloading according to one of the technical solutions of the present invention;

[0028] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0029] Figure 4 This is a front view schematic diagram of the overall structure of the second driving member and the connecting rod according to one of the technical solutions of the present invention;

[0030] Figure 5 This is a schematic structural diagram of the first sealing door and the second sealing door on the collection area and the filtration area according to one of the technical solutions of the present invention;

[0031] Figure 6 It is a schematic top view of the overall structure of the push sealing plate and the connecting rod according to one of the technical solutions of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure in which the filter element according to one of the technical solutions of the present invention is inserted on the inner wall of the filter area;

[0033] Figure 8 It is a schematic top view of the structure of the filter element described in one of the technical solutions of the present invention.

[0034] Figure markings: 1-extraction area; 2-filtration area; 3-collection area; 4-filter element; 401-frame plate; 402-filter medium; 5-cover plate; 6-drive motor; 7-belt; 8-stirring tube; 9-auxiliary rod; 10-connecting rod; 11-installation rod; 12-drive telescopic rod; 13-push sealing plate; 14-inner cavity; 15-top opening; 16-bottom opening; 17-sealing plate; 18-first sealing layer; 19-support reinforcement rod; 20-second sealing door; 21-first sealing door. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0036] like Figures 1 to 8 As shown, the present invention provides an olive pomace oil extraction device, comprising:

[0037] A reaction tank, which is divided into an extraction zone 1 and a filtration zone 2 which are transitionally connected from top to bottom, the extraction zone 1 and the filtration zone 2 are coaxial and both are square in shape, the length and width of the filtration zone 2 are smaller than the length and width of the extraction zone 1, the top of the extraction zone 1 is open and a cover plate 5 is movably arranged at the open position, a feed port is arranged on the cover plate 5, the bottom of the filtration zone 2 is open and a filter element 4 is arranged inside;

[0038] A stirring tube 8, the bottom end of which rotates from the cover plate 5 and extends into the extraction area 1, and the top end of which is located outside the cover plate 5;

[0039] A push-sealing plate 13 is provided between the filter element 4 and the stirring tube 8. The size of the push-sealing plate 13 is adapted to the filtering area 2 and a sealing layer is provided on the circumferential side wall of the push-sealing plate 13. A connecting rod 10 is provided at one end of the push-sealing plate 13 close to the extraction area 1. The top end of the connecting rod 10 coaxially passes through the stirring tube 8.

[0040] A first driving member, which drives the stirring tube 8 to rotate;

[0041] A second driving member, whose driving end is detachably connected to the protruding end of the connecting rod 10, so as to drive the connecting rod 10 to rise and fall, and then drive the pushing and sealing plate 13 to move back and forth between the extraction area 1 and the filtration area 2;

[0042] When the second driving member drives the push sealing plate 13 to move upward into the extraction area 1, a discharge channel is formed between the push sealing plate 13 and the inner wall of the extraction area 1; when the second driving member drives the push sealing plate 13 to move to the filtering area 2, the push sealing plate 13 isolates the extraction area 1 from the filtering area 2; when the second driving member drives the push sealing plate 13 to move downward along the inner wall of the filtering area 2, a pressurized space is formed between the push sealing plate 13 and the filtering element 4 to accelerate filtration;

[0043] In the above technical solution, the reaction tank includes a tank body (hereinafter referred to as extraction zone 1), a tank body (hereinafter referred to as filtration zone 2) where the extraction zone 1 is located, a tank body (hereinafter referred to as filtration zone 2) where the transition section is located, and a tank body (hereinafter referred to as filtration zone 2) where the filtration zone 2 is located, wherein the transition section is similar to a trapezoidal cylinder, and its top is connected to the bottom of the extraction zone 1, and its bottom is connected to the top of the filtration zone 2, so as to realize the transition connection between the extraction zone 1 and the filtration zone 2; the extraction zone 1 and the filtration zone 2 are both square cylinders, and a cover plate 5 is detachably provided at the top opening of the extraction zone 1, and a feed port is provided on the cover plate 5 for feeding, and the bottom of the filtration zone 2 is open for unloading;

[0044] A stirring tube 8 is coaxially arranged in the extraction zone 1. Here, coaxial means that the vertical central axis of the extraction zone 1 is consistent with the axial direction of the stirring tube 8. A plurality of stirring blades are arranged on the stirring tube 8. The top of the stirring tube 8 rotates and passes through the cover plate 5. The first driving member includes an auxiliary rod 9, a driving motor 6, a pair of transmission pulleys, and a belt 7. Specifically, an auxiliary rod 9 is vertically arranged on one side of the stirring tube 8. The bottom end of the auxiliary rod 9 is rotatably arranged on the cover plate 5. The top of the auxiliary rod 9 is coaxially connected to the output shaft of the driving motor 6. The driving motor 6 is installed on the cover plate 5 through a bracket (not shown in the figure). A transmission pulley is coaxially fixed on the auxiliary rod 9. Another transmission pulley is coaxially arranged on the stirring tube 8. The pair of transmission pulleys are connected by the belt 7. In this way, when the driving motor 6 rotates, the auxiliary rod 9 and the stirring tube 8 are driven to rotate synchronously. When the driving motor 6 is actually used, a reduction motor can be connected to control the rotation speed of the stirring tube 8.

[0045] A filter element 4 is installed in the filter area 2 to divide the filter area 2 into a processing area at the upper part and a filtering area at the lower part. The filter element 4 is installed at the lower part of the filter area 2.

[0046] The push sealing plate 13 is a horizontal plate, and a connecting rod 10 is provided on the top thereof. The connecting rod 10 is coaxial with the stirring tube 8, and one end of the connecting rod 10 away from the push sealing plate 13 passes through the stirring tube 8 and then extends out of the stirring tube 8. The end of the connecting rod 10 located outside the stirring tube 8 is connected to a mounting rod 11, and the mounting rod 11 and the connecting rod 10 form a T-shaped rod structure; the second driving member includes a pair of driving telescopic rods 12, the bottom of the pair of driving telescopic rods 12 can be installed on the support surface, and the pair of driving telescopic rods 12 can be installed on the support surface. The top of the telescopic rod 12 is connected to the two ends of the installation rod 11 respectively, so as to drive the installation rod 11 to rise and fall, and then drive the connecting rod 10 to rise and fall, and finally drive the push sealing plate 13 to rise and fall. In actual use, the telescopic ends of a pair of driving telescopic rods 12 can also be detachably connected to the cover plate 5, so as to move the cover plate 5 upward, and facilitate the cleaning of the stirring tube 8 and other components; the push sealing plate 13 reciprocates in the filtering area 2 and the extraction area 1, and the push sealing plate 13 is provided with a sealing layer along its circumferential side wall, which is a first sealing layer 18, so that when After the push-sealing plate 13 slides into the filtering area 2, it is slidably and sealedly connected with the inner wall of the filtering area 2, and the push-sealing plate 13 forms the bottom of the extraction area 1 to receive the filtered material, so as to facilitate the normal extraction operation of the material in the extraction area 1; when the push-sealing plate 13 moves up to the extraction area 1, since the length and width of the extraction area 1 are greater than the length and width of the filtering area 2, there is a space between the push-sealing plate 13 and the inner wall of the extraction area 1, and the space forms a discharge channel, so that the filtered material enters the filter element 4 from the discharge channel; the push-sealing plate 13 and the filtering area 2 After the inner wall is slidably sealed and connected, when the push sealing plate 13 is continuously pushed downward, a pressurized space is formed between the push sealing plate 13 and the filter element 4. As the push sealing plate 13 continues to move downward, the filtered material on the filter element 4 is filtered in a manner similar to pressurized filtering, which can speed up the filtering speed. In actual use, the height of the filter area 2 can be appropriately designed to facilitate the movement of the push sealing plate 13 for pressurization. In addition, the driving telescopic rod 12 can be a hydraulic rod, and in order to improve the stability of the reaction tank, a support reinforcing rod 19 can be designed on the outer wall of the reaction tank.

[0047] In this technical solution, when in use, by designing a reaction tank, an extraction zone 1, a filtration zone 2, a cover plate 5, a feed port, a filter element 4, a stirring tube 8, a push-sealing plate 13, a sealing layer, a first driving member, a second driving member, a discharge channel, and a pressurized space, when in use, the push-sealing plate 13 is initially located in the filtration zone 2 and is sealed and slidably connected to the inner wall of the filtration zone 2. At this time, the push-sealing plate 13 forms the bottom of the extraction zone 1 to isolate the extraction zone 1 from the filtration zone 2. At the same time, olive pomace slurry and oil extraction solvent are added to the extraction zone 1 through the feed port, and then the first driving member is started, and the stirring tube 8 rotates to stir and mix the cabbage pomace slurry and the oil extraction solvent, and then Then sulfate is added, and stirring and mixing are continued to obtain a mixture. When unloading is required, a collecting tank is placed under the filtering area 2, and then the second driving member is started to drive the pushing and sealing plate 13 to move upward to separate from the filtering area 2, and then the mixture enters the filtering area 2 from the unloading channel. After the mixture is filtered by the filtering element 4, the filtrate enters the collecting tank, and the filter residue remains on the filtering element 4. When the filtration speed is slow, the second driving member is started again to make the pushing plate enter the filtering area 2, and then the pushing plate is slowly moved downward to form a pressurized space between the pushing plate and the filtering element 4. The mixture above the filtering element 4 is quickly filtered under pressure, which improves the filtration speed and indirectly improves the extraction efficiency.

[0048] In another technical solution, an inner cavity 14 is formed inside the push sealing plate 13, an inlet and a top opening 15 are formed at the top of the inner cavity 14, a bottom opening 16 is formed at the bottom of the inner cavity 14, the inlet, the bottom opening 16, and the connecting rod 10 are all coaxial, the connecting rod 10 slides through the inlet and extends into the inner cavity 14, the extending end of the connecting rod 10 is coaxially connected to a sealing plate 17, and the diameter of the sealing plate 17 is larger than the diameters of the bottom opening 16 and the inlet;

[0049] When the push-sealing plate 13 is located in the filtering area 2, the second driving member drives the connecting rod 10 to move in the inner cavity 14 until the sealing plate 17 contacts the bottom of the inner cavity 14, and then drives the push-sealing plate 13 to continue to move downward to accelerate the filtration; when the second driving member drives the connecting rod 10 to move upward in the inner cavity 14 until the sealing plate 17 contacts the top of the inner cavity 14, the extraction area 1 is connected with the filtering area 2 through the top opening 15, the inner cavity 14 and the bottom opening 16, and at this time, the connecting rod 10 continues to move upward to drive the push-sealing plate 13 to move upward;

[0050] In this technical solution, an inner cavity 14 is provided inside the push-sealing plate 13, and the inner cavity 14 can be square. A bottom opening 16 is provided at the bottom of the inner cavity 14, and an inlet is provided at the top of the inner cavity 14. The bottom opening 16, the inlet, and the connecting rod 10 are all coaxially arranged, and the connecting rod 10 slides through the inlet and extends into the inner cavity 14. A sealing plate 17 is coaxially provided at the end of the connecting rod 10 located in the inner cavity 14, and a sealing layer is applied to the bottom of the sealing plate 17. The diameters of the sealing plate 17 and the sealing layer are larger than the diameters of the bottom opening 16 and the inlet, so that when the sealing plate 17 abuts against the bottom opening 16, the sealing plate 17 seals the bottom opening 16, and when the sealing plate 17 contacts the inner top wall of the inner cavity 14, the push-sealing plate 13 can be driven to move upward; the diameter of the connecting rod 10 is adapted to the inner diameter of the top opening 15, so that the connecting rod 10 slides against the inner wall of the top opening 15;

[0051] The inner cavity 14 is also provided with a top opening 15 at the top, and the number of the top openings 15 can be one, two or more, so as to be connected to the inner cavity 14; the top opening 15 is located outside the inlet, and the volume of the inner cavity 14 is larger than the volume of the sealing plate 17, so that the sealing plate 17 can move up and down in the inner cavity 14 and the side walls of the sealing plate 17 do not contact the inner wall of the inner cavity 14, so that the top opening 15 is connected with the bottom opening 16 through the inner cavity 14, thereby promoting the connection between the extraction area 1 and the filtration area 2;

[0052] In this technical solution, during use, when pressurized filtration is required, the second driving member is started to drive the connecting rod 10 to move down in the inner cavity 14 until the sealing plate 17 abuts against the bottom of the inner cavity 14. At this time, the sealing plate 17 seals the bottom opening 16 and drives the push sealing plate 13 to move down toward the filter element 4, thereby applying pressure to the filter material on the filter element 4 to promote rapid filtration. When the push sealing plate 13 moves to almost approach the filter element 4, the push sealing plate 13 can be moved up. At this time, the connecting rod 10 moves up in the inner cavity 14 to the top of the sealing plate 17 and contacts the inner top wall of the inner cavity 14. At this time, the extraction area 1 is connected with the filtration area 2, and the extraction area 1 is connected with the outside world. At this time, it is easier and more labor-saving to move the connecting rod 10 up to drive the push sealing plate 13 to move up.

[0053] In another technical solution, the reaction tank further includes a collecting area 3, which is disposed below the filtering area 2 and is coaxial with the filtering area 2. The collecting area 3 is square in shape, and the length and width of the collecting area 3 are both greater than those of the filtering area 2. The top of the collecting area 3 is transitionally connected to the bottom of the filtering area 2, that is, transitionally connected through a trapezoidal cylindrical structure. The use of this technical solution has the beneficial effect of facilitating direct collection of the filtrate by setting the collecting area 3.

[0054] In another technical solution, a collection tank (not shown in the figure) is provided in the collection area 3, and a first sealing door 21 is provided on the side wall of the collection area 3; specifically, the collection tank is used to collect filtrate. During use, the first sealing door 21 is opened to take out the collection tank, and then the filtrate can be taken out.

[0055] In another technical solution, the filter element 4 includes a frame plate 401 and a filter medium 402 laid in the frame plate 401. The frame plate 401 is hermetically clamped on the inner wall of the filtering area 2. A second sealing door 20 is provided on the side wall of the filtering area 2 to facilitate the placement of the filter element 4; specifically, the filter medium 402 can be common filter media 402 such as gauze and filter cloth, and can refer to the filter medium 402 for filtering traditional Chinese medicine residues; one pair of opposite side walls of the filtering area 2 are the first walls, and the other pair of opposite side walls are the second walls. The first wall is the side wall arranged along the width direction of the filtering area 2, and the second wall is the side wall arranged along the length direction of the filtering area 2. A passage hole is provided on one of the second walls. The passage hole is arranged along the length direction of the filtering area 2, and both ends of the passage hole along the length direction of the filtering area 2 are open. A second sealing door 20 is clamped on the passage hole. More specifically, the second sealing door 20 can be regarded as a plate body. The size of the plate body is adapted to the passage hole. A sealing material is laid on the circumference of the plate body. The plate body is hermetically filled into the passage hole through the sealing material to form the second sealing door 20. A second handle is provided on the second sealing door 20 to facilitate the removal of the second sealing door 20;

[0056] As Figure 7 shown, U-shaped grooves are provided on both of the pair of first walls. The openings of the pair of U-shaped grooves face each other. The U-shaped grooves are arranged along the width direction of the filtering area 2, and both ends of the pair of U-shaped grooves close to the second sealing door 20 are open to form a pair of initial placement openings. The pair of initial placement openings communicate with the passage hole. During use, the second sealing door 20 is removed from the passage hole, and then a pair of initial placement openings are exposed. Then the filter element 4 is inserted on the pair of U-shaped grooves from the pair of initial placement openings. During actual use, it is preferably that the lower inner bottom surface of the passage hole is flush with the lower inner bottom surface of the pair of U-shaped grooves. A sealing material can be laid on the circumference of the frame plate 401 to hermetically insert both ends of the frame plate 401 arranged in the pair of U-shaped grooves;

[0057] In this technical solution, during use, the second sealing door 20 is removed, the filter element 4 to be replaced is taken out, and then the frame plate 401 of the new filter element 4 is inserted onto a pair of U-shaped grooves through a pair of initial placement openings. One end of the frame plate 401 away from the pair of initial placement openings contacts the second wall of the pair of second walls that is far from the passage hole. Then, the second sealing door 20 is clamped on the passage hole, and the replacement of the filter element 4 can be completed. By adopting this technical solution, the beneficial effects obtained are that by designing the frame plate 401 and the filter medium 402, a structure of the filter element 4 is provided, which facilitates the installation and removal of the filter element 4. At the same time, the second sealing door 20 is provided to facilitate the replacement of the filter element 4 and the removal of the filter residue on the filter element 4 for reprocessing.

[0058] <Example 1>

[0059] The present invention also provides a method for jointly preparing olive pomace oil and dietary fiber, which specifically includes the following steps:

[0060] S1. Olive pomace conditioning: Add a conditioning agent to the olive pomace, then beat it into a pulp and perform ultrasonic conditioning to obtain an olive pomace pulp. Among them, the conditioning agent includes a eutectic solvent and a complex enzyme with a mass ratio of 1:2. The eutectic solvent includes an additive and water. In the eutectic solvent, the mass percentage of water is 20%. The additive includes choline chloride and an additive with a molar ratio of 1:2. The additive is lactic acid. The complex enzyme includes cellulase, hemicellulase, xylanase, and laccase with a mass ratio of 1:2:2:1. The addition amount of the complex enzyme is 0.3% of the mass of the olive pomace. The ultrasonic conditions are: 50 °C, 0.5 h to 2 h, 250 w.

[0061] S2. Extract olive pomace oil using an olive pomace oil extraction device: Initially, the push sealing plate 13 is located in the filtration area 2. Add the olive pomace pulp and the oil extraction solvent in S1 to the extraction area 1 through the feed port in sequence, start the first driving member, and the stirring tube 8 rotates. After stirring and mixing for 60 min, add sulfate through the feed port and continue stirring for 60 - 90 min to obtain a mixture. Among them, the oil extraction solvent is n-hexane. The mass ratio of the olive pomace to the oil extraction solvent is 1:8. The mass ratio of the olive pomace to the sulfate is 1:0.02. The sulfate is ammonium sulfate.

[0062] S3, start the second driving member, move the connecting rod 10 upward, drive the push plate to move upward to the extraction area 1, then the mixture in the extraction area 1 enters the filter element 4 through the discharge channel, the mixture is filtered through the filter element 4, the filtrate enters the collection area 3, and the filter residue remains on the filter element 4. When the unloading in the extraction area 1 is completed, start the second driving member, drive the connecting rod 10 downward, and then drive the push plate to move downward until the push plate is slidably sealed and connected with the inner wall of the filter area 2. At this time, continue to move the push plate downward, and a pressurized space is formed between the push plate and the filter element 4 to accelerate the filtration;

[0063] S4, collecting pomace oil: opening the first sealed door, taking out the collecting tank, removing the oil extraction solvent in the filtrate in the collecting tank, and obtaining pomace oil; the method for removing the solvent adopts the evaporation method or the reduced pressure evaporation method commonly used in the art, and the rotary evaporation method is adopted in this embodiment to remove the solvent, specifically: the rotary evaporation temperature is 65°C;

[0064] S5, preparation of pomace dietary fiber: open the second sealed door, take out the filter element, obtain filter residue, remove the oil extraction solvent in the filter residue, and obtain the treated filter residue; mix the filter residue with alkali solution at a mass ratio of 1:10, high-speed shear at 8000rpmrpm for 10min, and then place it at 40°C and 150rpm for hydrolysis for 30min, adjust the pH to 7.0 and filter to obtain supernatant and precipitate, mix the supernatant with 95% ethanol at a volume ratio of 1:4, and precipitate under reduced pressure at 0°C for 2h, and the precipitate is water soluble dietary fiber; the alcohol precipitate is mixed with the precipitate, and then ultrafinely crushed and sieved to make the particle size of the precipitate after screening into 150-200 meshes, so as to obtain olive dietary fiber; the alkali solution is 0.4g / 100mL NaOH solution; wherein, the method for removing the oil extraction solvent from the filter residue is an evaporation method or a drying method commonly used in the art, and the method for removing the oil extraction solvent from the filter residue in this embodiment is a drying method, specifically: the filter residue is placed at 60°C for treatment until the solvent residue is less than 200mg / kg.

[0065] <Example 2>

[0066] A method for preparing olive pomace oil and dietary fiber, comprising the following steps:

[0067] S1, olive pomace conditioning: adding a conditioning agent to the olive pomace, then beating and ultrasonic conditioning to obtain olive pomace pulp; wherein the conditioning agent comprises a low eutectic solvent and a composite enzyme in a mass ratio of 1:3, the low eutectic solvent comprises an additive and water, the mass percentage of water in the low eutectic solvent is 35%, the additive comprises choline chloride and an additive in a molar ratio of 2:1, the additive is glycerol, the composite enzyme comprises cellulase, hemicellulase, xylanase and laccase in a mass ratio of 1:2:2:1, and the addition amount of the composite enzyme is 0.6% of the mass of the olive pomace; the ultrasonic conditions are: 50°C, 0.5h-2h, 250w;

[0068] S2. Extracting olive pomace oil using an olive pomace oil extraction device: initially, the push sealing plate 13 is located in the filtering zone 2; the olive pomace slurry and the oil extraction solvent in S1 are sequentially added to the extraction zone 1 through the feed port, the first driving member is started, and the stirring tube 8 rotates. After stirring and mixing for 75 minutes, sulfate is added through the feed port, and stirring is continued for 75 minutes to obtain a mixture; wherein the oil extraction solvent is solvent No. 6, the mass ratio of the olive pomace to the oil extraction solvent is 1:9, the ratio of the olive pomace to the sulfate is 1:0.02, and the sulfate is specifically sodium sulfate;

[0069] S3, start the second driving member, move the connecting rod 10 upward, drive the push plate to move upward to the extraction area 1, then the mixture in the extraction area 1 enters the filter element 4 through the discharge channel, the mixture is filtered through the filter element 4, the filtrate enters the collection area 3, and the filter residue remains on the filter element 4. When the unloading in the extraction area 1 is completed, start the second driving member, drive the connecting rod 10 downward, and then drive the push plate to move downward until the push plate is slidably sealed and connected with the inner wall of the filter area 2. At this time, continue to move the push plate downward, and a pressurized space is formed between the push plate and the filter element 4 to accelerate the filtration;

[0070] S4, collecting pomace oil: opening the first sealed door, taking out the collecting tank, removing the oil extraction solvent in the filtrate in the collecting tank, and obtaining pomace oil; the method for removing the solvent adopts the evaporation method or the decompression method commonly used in the art, and the rotary evaporation method is adopted in this embodiment to remove the solvent, specifically: the rotary evaporation temperature is 60°C;

[0071] S5, preparation of pomace dietary fiber: open the second sealed door, take out the filter element, and obtain the filter residue; mix the filter residue with alkali solution at a mass ratio of 1:15, high-speed shear at 15000rpm for 10min, and then place it at 40°C and 150rpm for hydrolysis for 30min, adjust the pH to 7.0 and filter to obtain supernatant and precipitate, mix the supernatant with 95% ethanol at a volume ratio of 1:6, precipitate under reduced pressure at 10°C for 6h, vacuum dry, crush and sieve to 80 mesh, and obtain water The precipitate is ultrafinely crushed and sieved to make the particle size of the precipitate after screening into 150-200 meshes, so as to obtain insoluble dietary fiber; the alkali solution is a 0.6g / 100mL NaOH solution; wherein, the method for removing the oil extraction solvent from the filter residue is an evaporation method or a drying method commonly used in the art, and the method for removing the oil extraction solvent from the filter residue in this embodiment is a drying method, specifically: the filter residue is placed at 60-80°C and treated until the solvent residue is less than 200mg / kg.

[0072] <Example 3>

[0073] A method for preparing olive pomace oil and dietary fiber, comprising the following steps:

[0074] S1, olive pomace conditioning: adding a conditioning agent to the olive pomace, then beating and ultrasonic conditioning to obtain olive pomace pulp; wherein the conditioning agent comprises a low eutectic solvent and a composite enzyme in a mass ratio of 1:4, the low eutectic solvent comprises an additive and water, the mass percentage of water in the low eutectic solvent is 50%, the additive comprises choline chloride and an additive in a molar ratio of 3:1, the additive is ethylene glycol, the composite enzyme comprises cellulase, hemicellulase, xylanase and laccase in a mass ratio of 1:2:2:1, and the addition amount of the composite enzyme is 0.8% of the mass of the olive pomace; the ultrasonic conditions are: 50°C, 0.5h-2h, 250w;

[0075] S2. Extracting olive pomace oil using an olive pomace oil extraction device: initially, the push sealing plate 13 is located in the filtering zone 2; the olive pomace slurry and the oil extraction solvent in S1 are sequentially added to the extraction zone 1 through the feed port, the first driving member is started, the stirring tube 8 rotates, and after stirring and mixing for 90 minutes, sulfate is added through the feed port, and stirring is continued for 90 minutes to obtain a mixture; wherein the oil extraction solvent is solvent No. 6, the mass ratio of the olive pomace to the oil extraction solvent is 1:10, the ratio of the olive pomace to the sulfate is 1:0.02, and the sulfate is specifically ammonium sulfate;

[0076] S3, start the second driving member, move the connecting rod 10 upward, drive the push plate to move upward to the extraction area 1, then the mixture in the extraction area 1 enters the filter element 4 through the discharge channel, the mixture is filtered through the filter element 4, the filtrate enters the collection area 3, and the filter residue remains on the filter element 4. When the unloading in the extraction area 1 is completed, start the second driving member, drive the connecting rod 10 downward, and then drive the push plate to move downward until the push plate is slidably sealed and connected with the inner wall of the filter area 2. At this time, continue to move the push plate downward, and a pressurized space is formed between the push plate and the filter element 4 to accelerate the filtration;

[0077] S4, collecting pomace oil: opening the first sealed door, taking out the collecting tank, removing the oil extraction solvent in the filtrate in the collecting tank, and obtaining pomace oil; the method for removing the solvent adopts the evaporation method or the decompression method commonly used in the art, and the rotary evaporation method is adopted in this embodiment to remove the solvent, specifically: the rotary evaporation temperature is 60°C;

[0078] S5, preparation of pomace dietary fiber: open the second sealed door, take out the filter element, and obtain the filter residue; mix the filter residue with alkali solution at a mass ratio of 1:12, high-speed shear at 12000rpmrpm for 10min, and then place it at 40°C and 150rpm for hydrolysis for 30min, adjust the pH to 7.0 and filter to obtain a supernatant and a precipitate, mix the supernatant with 95% ethanol at a volume ratio of 1:5, precipitate under reduced pressure at 5°C for 4h, vacuum dry, crush and sieve to 70 mesh, and obtain a water-soluble The precipitate is ultrafinely ground and sieved to make the particle size of the precipitate after screening into 150-200 meshes to obtain insoluble dietary fiber; the alkali solution is 0.5g / 100mL NaOH solution; wherein, the method for removing the oil extraction solvent from the filter residue is an evaporation method or a drying method commonly used in the art. In this embodiment, the method for removing the oil extraction solvent from the filter residue is a drying method, specifically: the filter residue is placed at 60-80°C and treated until the solvent residue is less than 200mg / kg.

[0079] <Comparative Example 1>

[0080] Alkaline hydrolysis alone: ​​Comparative Example 1 is compared with Example 1, in which the conditioning agent in step S1 is water, and the rest is the same as Example 1.

[0081] <Comparative Example 2>

[0082] Enzymatic hydrolysis alone: ​​Compared with Example 1, in Comparative Example 2, no alkali solution was added in step S5, and the rest was the same as in Example 1.

[0083] <Comparative Example 3>

[0084] No treatment: Comparative Example 3 is compared with Example 1, in which the conditioning agent in step S1 is water, and in step S5 no alkali solution is added, and the rest is the same as Example 1.

[0085] <Extraction rate of olive pomace oil>

[0086] Extraction rate determination method: extraction rate (%) = (mass of oil extracted from 1g pomace / oil content of 1g pomace) × 100%; the oil extracted from the pomace here is the oil after the solvent is removed in step S4, and the oil content of the pomace is determined by Soxhlet extraction method.

[0087] Sample: The extraction rate of the olive pomace oil in Examples 1 to 3 was measured. The specific data are shown in Table 1:

[0088] Table 1 Results of the extraction rate of olive pomace oil in Examples 1 to 3

[0089] Experimental example Extraction rate (%) Example 1 84.31 Example 2 85.24 Example 3 82.55

[0090] As can be seen from Table 1, the extraction rate of olive pomace oil extracted by using a low eutectic solvent combined with a composite enzyme is relatively high, indicating that the extraction method of the present invention has certain production and application prospects.

[0091] <Water-soluble dietary fiber content>

[0092] Extraction rate determination method: extraction rate (%) = (water-soluble dietary fiber mass / olive dietary fiber mass) × 100%; here, water-soluble dietary fiber refers to the water-soluble dietary fiber obtained in step S5, and olive dietary fiber refers to the olive dietary fiber obtained in step S5.

[0093] Sample: The content of water-soluble dietary fiber in olive dietary fiber in Example 1 and Comparative Examples 1 to 3 was measured. The specific data is shown in Table 2;

[0094] Table 2 Results of water-soluble dietary fiber content in Example 1 and Comparative Examples 1 to 3

[0095] Experimental example Water-soluble dietary fiber content (%) Example 1 35.6 Comparative Example 1 24.5 Comparative Example 2 12.1 Comparative Example 3 5.2

[0096] As can be seen from Table 2, adding both the complex enzyme and the alkali solution can increase the content of water-soluble dietary fiber, but adding the complex enzyme and the alkali solution at the same time can greatly increase the extraction rate of water-soluble dietary fiber, indicating that the present invention has good application prospects.

[0097] <Water-holding capacity of olive dietary fiber>

[0098] Method: Weigh 1.00g of dry dietary fiber to be tested into a 50ml centrifuge tube, add 25ml of distilled water, stir thoroughly for 1h, centrifuge at 3000r / min for 10min, discard the supernatant and use filter paper to absorb the residual water on the inner wall of the centrifuge tube, weigh the mass, and calculate the water holding capacity (R) of the dietary fiber to be tested according to the following formula: WHC ).

[0099] RWHC =(m 1 ~m) / m;

[0100] m 1 ~The mass of dietary fiber to be tested, g;

[0101] m ~ the mass of the dietary fiber to be tested after absorbing water, g;

[0102] Sample: The olive dietary fibers obtained in Example 1 and Comparative Examples 1 to 3 were used as the dietary fibers to be tested, and their water holding capacity was measured. The specific data are shown in Table 3.

[0103] Table 3 Water holding capacity of olive dietary fiber in Example 1 and Comparative Examples 1 to 3

[0104]

[0105]

[0106] It can be seen from Table 3 that the addition of both the complex enzyme and the alkali solution can improve the water holding capacity of the olive dietary fiber, but the addition of the complex enzyme and the alkali solution at the same time can significantly improve the water holding capacity of the olive dietary fiber, indicating that the present invention has good application prospects.

[0107] <Oil-holding capacity of olive dietary fiber>

[0108] Method: Weigh 1.00g of dry dietary fiber to be tested into a 50ml centrifuge tube, add 20g of vegetable oil, let stand at room temperature for 1h, centrifuge at 3000r / min for 20min, remove the upper layer of oil and use filter paper to absorb the residual vegetable oil on the inner wall of the centrifuge tube, weigh the mass, and calculate the oil holding capacity (R) of the dietary fiber to be tested according to the following formula: OHC ).

[0109] R OHC =(m 1 ~m) / m;

[0110] m 1 ~The mass of dietary fiber to be tested, g;

[0111] m ~ the mass of the dietary fiber to be tested after oil absorption, g;

[0112] Sample: The olive dietary fibers obtained in Example 1 and Comparative Examples 1 to 3 were used as the dietary fibers to be tested, and their oil holding capacity was measured. The specific data are shown in Table 4.

[0113] Table 4 Results of oil holding capacity of olive dietary fiber in Example 1 and Comparative Examples 1 to 3

[0114] Experimental example Olive dietary fiber oil holding capacity (g / g) Example 1 5.84 Comparative Example 1 3.48 Comparative Example 2 3.54 Comparative Example 3 2.46

[0115] It can be seen from Table 4 that the addition of both the complex enzyme and the alkali solution can improve the oil holding capacity of olive dietary fiber, but the addition of the complex enzyme and the alkali solution at the same time can significantly improve the oil holding capacity of olive dietary fiber, indicating that the present invention has good application prospects.

[0116] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Olive pomace oil extraction device, characterized in that, include: The reaction tank is divided into an extraction zone and a filtration zone connected from top to bottom, the extraction zone and the filtration zone are coaxial and both are square, the length and width of the filtration zone are smaller than the length and width of the extraction zone, the top of the extraction zone is open and a cover plate is movably provided at the open position, a feed port is provided on the cover plate, and the bottom of the filtration zone is open and a filter element is provided inside; A stirring tube, the bottom end of which rotates from the cover plate into the extraction area and the top end of which is located outside the cover plate; A push-sealing plate is provided between the filter element and the stirring tube, the size of the push-sealing plate is adapted to the filtering area and a sealing layer is provided on the circumferential side wall of the push-sealing plate, a connecting rod is provided at one end of the push-sealing plate close to the extraction area, and the top end of the connecting rod coaxially passes through the stirring tube; A first driving member, which drives the stirring tube to rotate; A second driving member, whose driving end is detachably connected to the passing end of the connecting rod, so as to drive the connecting rod to rise and fall and thereby drive the pushing and sealing plate to reciprocate between the extraction area and the filtering area; When the second driving member drives the push sealing plate to move upward into the extraction area, a unloading channel is formed between the push sealing plate and the inner wall of the extraction area; when the second driving member drives the push sealing plate to move to the filtering area, the push sealing plate isolates the extraction area from the filtering area; when the second driving member drives the push sealing plate to move downward along the inner wall of the filtering area, a pressurized space is formed between the push sealing plate and the filter element to accelerate the filtration.

2. The olive pomace oil extraction device according to claim 1, characterized in that: An inner cavity is formed inside the push-sealing plate, an inlet and a top opening are formed at the top of the inner cavity, a bottom opening is formed at the bottom of the inner cavity, the inlet, the bottom opening and the connecting rod are all coaxial, the connecting rod slides through the inlet and extends into the inner cavity, the extending end of the connecting rod is coaxially connected to a sealing plate, and the diameter of the sealing plate is larger than the diameters of the bottom opening and the inlet; Among them, when the push sealing plate is located in the filtration area, the second driving member drives the connecting rod to move in the inner cavity until the sealing plate abuts against the bottom of the inner cavity, and then drives the push sealing plate to continue to move downward to accelerate the filtration; when the second driving member drives the connecting rod to move upward in the inner cavity until the sealing plate contacts the top of the inner cavity, the extraction area is connected with the filtration area through the top opening, the inner cavity and the bottom opening. At this time, the connecting rod continues to move upward to drive the push sealing plate to move upward.

3. The olive pomace oil extraction device according to claim 2, characterized in that: The reaction tank also includes a collection area, which is arranged below the filtration area and is coaxial with the filtration area. The collection area is square in shape, the length and width of the collection area are both larger than the length and width of the filtration area, and the top of the collection area is transitionally connected to the bottom of the filtration area.

4. The olive pomace oil extraction device according to claim 3, characterized in that: A collecting trough is provided in the collecting area, and a first sealing door is provided on the side wall of the collecting area.

5. The olive pomace oil extraction device according to claim 4, characterized in that: The filter element comprises a frame plate and a filter medium laid in the frame plate. The frame plate is sealed and clamped on the inner wall of the filter area. A second sealing door is provided on the side wall of the filter area to accommodate the filter element.

6. A method for preparing olive pomace oil and dietary fiber, characterized in that: The steps include: S1, olive pomace conditioning: adding a conditioning agent to the olive pomace, then beating and ultrasonic conditioning to obtain olive pomace pulp; wherein the conditioning agent comprises a low eutectic solvent and a composite enzyme in a mass ratio of 1:2 to 1:4, the low eutectic solvent comprises an additive and water, the mass percentage of water in the low eutectic solvent is 20% to 50%, the additive comprises choline chloride and an additive in a molar ratio of 1:2 to 3:1, the additive is one of lactic acid, citric acid, glycerol, and ethylene glycol, the composite enzyme comprises cellulase, hemicellulase, xylanase, and laccase in a mass ratio of 1:2:2:1, and the addition amount of the composite enzyme is 0.3 to 0.8% of the mass of the olive pomace; the ultrasonic conditions are: 50°C, 0.5h to 2h, 250w; S2. Extracting olive pomace oil using the olive pomace oil extraction device as described in claim 5: initially, the push sealing plate is located in the filtering area; the olive pomace slurry and the oil extraction solvent in S1 are sequentially added to the extraction area through the feed port, the first driving member is started, the stirring tube rotates, and after stirring and mixing for 60 to 90 minutes, sulfate is added through the feed port, and stirring is continued for 60 to 90 minutes to obtain a mixture; S3, start the second driving member, move the connecting rod upward, drive the push plate to move upward to the extraction area, then the mixture in the extraction area enters the filter element through the discharge channel, the mixture is filtered by the filter element, the filtrate enters the collection area, and the filter residue remains on the filter element. When the unloading in the extraction area is completed, start the second driving member, drive the connecting rod downward, and then drive the push plate downward until the push plate is slidably sealed and connected with the inner wall of the filter area. At this time, continue to move the push plate downward, and a pressurized space is formed between the push plate and the filter element to accelerate the filtration; S4, collecting pomace oil: opening the first sealed door, taking out the collecting tank, removing the oil extraction solvent in the filtrate in the collecting tank, and obtaining pomace oil; S5. Preparation of pomace dietary fiber: open the second sealed door, take out the filter element, obtain filter residue, remove the oil extraction solvent in the filter residue, and obtain treated filter residue; mix the treated filter residue with alkali solution at a mass ratio of 1:10 to 1:15, high-speed shear at 8000rpm to 15000rpm for 10min, then place it at 40°C and 150rpm for hydrolysis for 30min, adjust the pH to 7.0 and filter to obtain supernatant and precipitate, mix the supernatant with 95% ethanol at a volume ratio of 1:4 to 1:6, and precipitate under reduced pressure at 0°C to 10°C for 2 to 6h, the precipitate is water-soluble dietary fiber; mix the precipitate with the precipitate, ultrafine grind and sieve, so that the precipitate particle size after sieving is 150 to 200 mesh, and obtain olive dietary fiber; the alkali solution is 0.4 to 0.6g / 100mL NaOH solution.

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