Method for extracting and separating wheat pentosan

Abstract

The invention discloses a wheat pentosan extraction and separation method, which comprises the following steps: coating a mixture of high-viscosity pentosan and low-viscosity glucose on silk threads, and enabling the mixture to flow along the silk threads in the same direction; then the low-viscosity glucose and the high-viscosity pentosan are separated due to different stress, and finally the high-viscosity pentosan located at the rear of the flow direction position is collected. The method is suitable for a fermentation process for preparing alcohol from wheat starch, pentosan can be separated from fermentation liquor in advance, energy consumption is reduced, and the problem of equipment and pipeline treatment pressure is solved.

Description

Technical Field

[0001] The invention relates to the technical field of pentosan extraction, in particular to a method for extracting and separating wheat pentosan. Background Art

[0002] There are four main steps in the deep processing of wheat to prepare high-concentration alcohol. First, the wheat starch is liquefied into a slurry, and then hydrolyzed at high temperature to convert it into glucose. After that, the glucose generates alcohol under the fermentation of yeast, and 95% alcohol is obtained by distillation. During the production process, the company found that wheat starch not only contains starch that can be used by yeast, but also contains a large amount of pentosan. As a non-starch polysaccharide, pentosan can be freely stretched into a spiral rod-like structure in water, which greatly increases the viscosity of the aqueous solution. Since it cannot be directly used by yeast, pentosan will follow the raw materials into various equipment and pipelines until it is discharged and processed in the final process. The large amount of pentosan will not only occupy a lot of heat energy and push up the company's costs, but also because of the high viscosity of pentosan, it will also cause huge pressure on the filtration equipment and pipelines, which need to be treated regularly. How to separate pentosan from the slurry in advance is an important issue that companies urgently need to consider.

[0003] U.S. Patent US3994809A discloses a device for separating liquid materials of different viscosities. The device utilizes the different adhesion of materials of different viscosities on fibers to change the movement path of the materials, thereby realizing the separation function of the mixed liquid components. However, this method requires the raw materials to be sprayed into droplets for processing, resulting in high processing costs. At the same time, when the high-viscosity material collides with the densely distributed fibers, a large amount of splashing will fall below and mix with the low-viscosity material, resulting in poor separation effect. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for extracting and separating wheat pentosans.

[0005] The purpose of the present invention is achieved through the following technical scheme: A method for extracting and separating wheat pentosans, comprising the following steps:

[0006] S1. coating a mixture of high-viscosity pentosan and low-viscosity glucose on a silk thread;

[0007] S2. Make the mixture flow in the same direction along the wire;

[0008] S3. Low-viscosity glucose and high-viscosity pentosan are separated due to different forces;

[0009] S4. Collect the highly viscous pentosan located at the back of the flow direction.

[0010] Preferably, in step S2, the wire is suspended so that the mixture flows from top to bottom by its own gravity.

[0011] Preferably, the silk thread is connected end to end and also includes a slurry pool for holding a mixed liquid, a collecting mechanism, and a driving mechanism. The silk thread is partially immersed in the slurry pool. The driving mechanism rotates the silk thread. The collecting mechanism is located on the silk thread, and the collecting mechanism scrapes off the high-viscosity pentosan located on the silk thread.

[0012] Preferably, the driving mechanism comprises a rotating drum and a roller, the rotating drum is located in the slurry pool, the roller is located above the slurry pool, the silk thread is sleeved between the rotating drum and the roller, and rotates with the rotating drum and the roller.

[0013] Preferably, the driving mechanism also includes a bracket, the rollers are multiple and symmetrically distributed on the bracket, the rollers are rotatably connected to the bracket, the silk threads are multiple, and one end of the silk threads are jointly wrapped around the rotating drum, and the other ends of the silk threads are separated and wrapped around the rollers distributed in symmetrical positions.

[0014] Preferably, the collecting mechanism includes a cylinder, an adjusting plate, and a spring. The adjusting plate is a semicircular plate. The adjusting plate is obliquely arranged in the cylinder. The straight end axis of the adjusting plate is hinged to the center line of the bottom surface of the cylinder. The spring elastically supports the bottom surface of the adjusting plate and the bottom of the cylinder. A scraping hole is arranged on the adjusting plate. A lower liquid hole and a wire passing hole are arranged on the bottom surface of the cylinder. The wire passing hole is located below the scraping hole, and the lower liquid hole is located on the opposite side of the wire passing hole.

[0015] Preferably, the driving mechanism includes a first rotating shaft, a plurality of support rods, a support ring, and a plurality of fixed rods, one end of the plurality of support rods is fixedly connected to the rotating shaft, the other ends of the plurality of support rods are fixedly connected to the inner surface of the support ring, the plurality of fixed rods are distributed on the outer surface of the support ring at intervals, and the silk threads are connected and distributed on the fixed rods in sequence.

[0016] Preferably, the collecting mechanism includes a collecting plate, a second rotating shaft, and a scraper. The rotating shaft is fixedly connected to the center of the collecting plate. A plurality of annular liquid collecting grooves are concentrically arranged on the collecting plate. Part of the surface of the collecting plate abuts the wire. The scraper is inclined. The scraper is provided with a collecting groove for receiving the liquid. The side of the scraper is provided with scraping teeth matching the liquid collecting groove. The scraping teeth are inserted into the liquid collecting groove, and the side of the scraper on the same side abuts the surface of the collecting plate.

[0017] Preferably, there are two collecting mechanisms, which are respectively located on opposite sides of the silk thread, and the silk thread is alternately connected to the left and right sides of the fixing rod.

[0018] The present invention has the following advantages: a method for extracting and separating pentosan is provided, which is suitable for the fermentation process of preparing alcohol from wheat starch and can separate pentosan from the fermentation liquid in advance. The method utilizes the different viscosities between pentosan and glucose and uses the separation principle that different flow velocities are caused by different forces during the flow process. The method solves the blockage problem caused by a large number of high-viscosity pentosan retention processing equipment and pipelines, and reduces energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a process flow chart of the present invention;

[0020] Figure 2 This is a schematic diagram of the principle structure of Embodiment 1 of the present invention;

[0021] Figure 3 yes Figure 2 A schematic cross-sectional view of the middle collection cup;

[0022] Figure 4 This is a schematic diagram of the principle structure of Embodiment 2 of the present invention;

[0023] Figure 5 is a schematic diagram of the position relationship between the collecting plate and the scraper in Example 2;

[0024] Figure 6 is a schematic diagram of the cross-sectional structure of the wire and the fixing rod in Example 2;

[0025] Figure 7 It is a schematic diagram of the staggered connection between the wire and the adjacent fixing rods in Example 2.

[0026] In the figure, 1, slurry pool; 2, silk thread; 3, rotating drum; 4, connecting rod; 5, roller; 6, collecting cup; 7, cylinder; 8, scraping hole; 9, lower liquid hole; 10, spring; 11, first rotating shaft; 12, support rod; 13, support ring; 14, fixing rod; 15, collecting plate; 16, second rotating shaft; 17, scraper; 18, collecting tank; 19, scraping teeth; 20, adjusting plate; 21, wire hole; 22, collecting tank. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] The molecular formula of pentosan is (C5H8O4)n, and it has a high molecular weight. Pentosan, also known as polypentose, is a condensation product of several pentoses (five-carbon sugars). The final product of its hydrolysis is pentose. Pentosan is a non-starch polysaccharide, which is divided into water-soluble pentosan and alkali-soluble pentosan. Water-soluble pentosan can be freely stretched into a spiral rod-like structure in water, which makes it more viscous than glucose and not easily decomposed into alcohol by yeast.

[0029] The invention provides a method for extracting and separating wheat pentosan, which is mainly used in the process of industrial alcohol production to separate the pentosan contained in wheat starch from the fermentation liquid in advance. It is a method suitable for separating liquid, mixed, high-viscosity substances and low-viscosity substances. The specific method steps are as follows: Figure 1 As shown,

[0030] S1. After the high-temperature hydrolysis of wheat starch is completed, the starch is hydrolyzed into glucose at about 60°C, and the hydrolysis temperature of pentosan is about 100°C, which is higher than the hydrolysis temperature of starch, so that the pentosan still maintains its original structural form, and the mixture of high-viscosity pentosan and low-viscosity glucose is discharged into the slurry pool 1, and the silk thread 2 is immersed in the slurry pool 1, so that the mixed liquid is coated on the silk thread 2;

[0031] S2. The wire 2 is removed from the slurry pool 1 and suspended so that the mixture flows from top to bottom by its own gravity;

[0032] S3. Low-viscosity glucose and high-viscosity pentosan have different flow rates on thread 2 due to different forces, so that the two gradually separate. Low-viscosity glucose flows faster and is located below thread 2, while high-viscosity pentosan flows slower and is located above the thread.

[0033] S4. Use equipment to collect the high-viscosity pentosan located at the rear of the flow direction, that is, above the thread 2.

[0034] The wire 2 can be selected to be a thin wire composed of any fibrous material, including but not limited to steel, stainless steel or other forms of iron; copper or other copper-containing metals; nickel or other nickel-containing metals; aluminum or any metal that can be made into fibers, has sufficient strength and is not corroded by the separated fluid; most commercial plastic fibers, such as cellulose acetate, nylon, polycarbonate, polyethylene, polypropylene, fluorocarbons and polyurethane; the wire 2 is not a porous bundle of thin wires woven together.

[0035] In addition to relying on gravity to make two materials of different viscosities flow in both directions, other methods such as centrifugation and air flow blowing can also be selected. The present invention preferably uses gravity sedimentation separation.

[0036] Example 1

[0037] like Figure 2As shown, the extraction and separation device using the above method includes a silk thread 2 connected end to end, a slurry pool 1 containing a mixed liquid, a collecting mechanism, and a driving mechanism. The driving mechanism includes a rotating drum 3, a plurality of rollers 5, and an inverted T-shaped connecting rod 4. The rotating drum 3 is located in the slurry pool 1, and the rotating drum 3 is driven to rotate by a motor located outside the slurry pool 1. The connecting rod 4 and the rollers 5 are located above the slurry pool 1. The rollers 5 are distributed on the connecting rod 4 in a triangular shape with three rollers as a group and symmetrically spaced. Figure 1 There are 4 groups in the middle, and the roller 5 and the connecting rod 4 are connected with each other in horizontal rotation through an axis.

[0038] There are multiple wires 2, each wire 2 corresponds to a group of rollers 5, one end of each wire 2 is wrapped around the drum 3 together, so that the slurry adheres to the wire 2, and the other end of the wire 2 is separated and wrapped around the rollers 5 distributed in symmetrical positions. The drum 3 rotates counterclockwise to drive the wire 2 to move. The separated wires 2 can avoid interference between the wire bundles and ensure normal flow.

[0039] The collecting mechanism is a collecting cup 6, which is divided into two symmetrical parts, and the two parts are snap-fitted together and fixedly connected by bolts, so that the wire 2 can be passed through the collecting cup 6 for installation without damage. Figure 3 A part of the collecting cup 6 is shown in the figure. The collecting cup 6 includes a cylinder 7, an adjusting plate 20, and a spring 10. The adjusting plate 20 is a semicircular plate. The diameter of the adjusting plate 20 is the same as the inner diameter of the cylinder 7. The adjusting plate 20 is tilted in the cylinder 7. The straight end of the adjusting plate 20 is hinged to the center line of the bottom surface of the cylinder 7 through a rotating shaft. A fixing column is installed on the bottom surface of the adjusting plate 20, and a fixing column is installed at the bottom of the cylinder 7. The two ends of the spring 10 are respectively sleeved in the fixing columns, and the fixing columns are not drawn. The spring 10 elastically supports the bottom surface of the adjusting plate 20 and the bottom of the cylinder 7. A scraping hole 8 is opened on the symmetry line of the adjusting plate 20. The scraping hole 8 accommodates the silk thread 2, and the diameter of the scraping hole 8 is 1 / 1 of the diameter of the silk thread 2. .5 times, under the push of the spring 10, the scraper hole 8 is close to the surface of the silk thread 2. If there is too much material adhering to the silk thread 2 and the resistance is too large, the material will push the adjusting plate 20 to rotate and press down the spring 10, thereby increasing the gap between the silk thread 2 and the scraper hole 8, reducing the amount of scraped material, reducing resistance, and avoiding the breakage of the silk thread 2. A lower liquid hole 9 and a wire hole 21 are provided on the bottom surface of the cylinder 7. The wire hole 21 is located directly below the scraper hole 8. In order to facilitate the rapid passage of the silk thread 2, the lower liquid hole 9 is located on the opposite side of the wire hole 21 to collect high-viscosity materials flowing down from the adjusting plate 20. Each silk thread 2 corresponds to a collecting cup 6, and the collecting cups 6 can be fixed to the ground through a rack.

[0040] The separation device of this structure can adjust the height between the drum 3 and the roller 5 according to the material properties of the silk thread 2 and the separation speed without occupying too much horizontal space. At the same time, the number of rollers 5, silk threads 2 and collecting cups 6 can be quickly increased at any time to improve the separation efficiency.

[0041] Example 2

[0042] like Figure 4 As shown, the extraction and separation device includes a silk thread 2 connected end to end, a slurry pool 1 for containing a mixed liquid, two sets of collecting mechanisms, and a driving mechanism. The driving mechanism includes a first rotating shaft 11, a plurality of support rods 12, a support ring 13, and a plurality of fixed rods 14. One end of the plurality of support rods 12 is fixedly connected to the rotating shaft, and the other end of the plurality of support rods 12 is fixedly connected to the inner surface of the support ring 13. The first rotating shaft 11 is driven to rotate counterclockwise by an external motor, and the plurality of fixed rods 14 are distributed around the outer surface of the support ring 13 at intervals, and the fixed rods 14 are plugged into the support ring 13, as shown in FIG. Figure 6 As shown, a slot for accommodating the thread 2 is provided on the side of the fixing rod 14, and the thread 2 passes through and is positioned in the slot in sequence. Increasing the number of the slots can conveniently increase the number of the thread 2 and improve the extraction amount of a single turn.

[0043] like Figure 4 , Figure 5 As shown, the collecting mechanism includes a collecting tray 15, a second rotating shaft 16, and a scraper 17. The second rotating shaft 16 is fixedly connected to the center of the collecting tray 15, and the second rotating shaft 16 is driven counterclockwise by an external motor. A plurality of annular liquid collecting grooves 18 are concentrically arranged on the collecting tray 15. The right half of the collecting tray 15 abuts against the wire 2, and the collecting tray 15 and the wire 2 are in reverse contact and friction, so that most of the material adhering to the wire 2 is collected in the liquid collecting groove 18. The scraper 17 is inclined, and the scraper 17 is recessed downward to form a collecting groove 22 for receiving the liquid. The side of the scraper 17 is provided with scraping teeth 19 matching the liquid collecting groove 18, and the scraping teeth 19 are inserted into the liquid collecting groove 18, and the side of the scraper 17 on the same side abuts against the surface of the collecting tray 15, and the scraping teeth 19 scrape out the liquid in the liquid collecting groove 18 and drop it into the collecting groove 22 formed by the scraper 17.

[0044] like Figure 4 As shown, two collecting mechanisms are installed and are located on opposite sides of the wire 2, respectively. Figure 7 As shown, the slots for accommodating the silk thread 2 on two adjacent fixed rods 14 are alternately arranged on the left and right sides, so that the silk thread 2 is alternately connected to the left and right sides of the fixed rod 14 in a serpentine shape, and the collecting mechanisms located on both sides of the silk thread 2 respectively contact the protruding parts of the silk thread 2 relative to the fixed rod 14, thereby completing the collection of liquid adhered to different surfaces of the silk thread 2 to improve the collection rate.

[0045] The extraction device of this structure optimizes the collection mechanism compared to Example 1, avoiding the direct use of the sharp edges of the components to scrape the silk thread 2, and can effectively avoid the burrs and breakage problems caused by the long-term contact of the silk thread 2; the collection mechanism adopts a collecting plate 15 with a large contact area, which can not only be expanded arbitrarily according to the number of silk threads 2, but also the collecting plate 15 has a fast cleaning speed from the silk thread 22, and the scraper 17 has a fast scraping and collecting speed from the collecting plate 15, thereby improving the extraction efficiency.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for extracting and separating wheat pentosans, characterized in that: The following steps are included: S1. coating a mixture of high-viscosity pentosan and low-viscosity glucose on the silk thread (2); S2. The mixture flows in the same direction along the wire (2); S3. Low-viscosity glucose and high-viscosity pentosan are separated due to different forces; S4. Collect the highly viscous pentosan located at the back of the flow direction.

2. A method for extracting and separating wheat pentosans according to claim 1, characterized in that: In step S2, the wire (2) is suspended so that the mixed material flows from top to bottom by its own gravity.

3. A method for extracting and separating wheat pentosans according to claim 1, characterized in that: The silk thread (2) is connected end to end and further comprises a slurry pool (1) containing a mixed liquid, a collecting mechanism, and a driving mechanism. The silk thread (2) is partially immersed in the slurry pool (1), the driving mechanism causes the silk thread (2) to rotate, and the collecting mechanism is located on the silk thread (2). The collecting mechanism scrapes off the high-viscosity pentosan located on the silk thread (2).

4. A method for extracting and separating wheat pentosans according to claim 3, characterized in that: The driving mechanism comprises a rotating drum (3) and a roller (5); the rotating drum (3) is located in the slurry pool (1); the roller (5) is located above the slurry pool (1); the silk thread (2) is sleeved between the rotating drum (3) and the roller (5) and rotates with the rotating drum (3) and the roller (5).

5. A method for extracting and separating wheat pentosans according to claim 4, characterized in that: The driving mechanism further comprises a connecting rod (4), the rollers (5) being multiple and symmetrically spaced on the connecting rod (4), the rollers (5) being rotatably connected to the connecting rod (4), the silk threads (2) being multiple and having one end wrapped around the rotating drum (3), and the other end of the silk threads (2) being separated and wrapped around the rollers (5) distributed in symmetrical positions.

6. A method for extracting and separating wheat pentosans according to claim 4 or 5, characterized in that: The collecting mechanism comprises a cylinder (7), an adjusting plate (20), and a spring (10); the adjusting plate (20) is a semicircular plate; the adjusting plate (20) is arranged obliquely in the cylinder (7); the straight end axis of the adjusting plate (20) is hinged to the center line of the bottom surface of the cylinder (7); the spring (10) elastically supports the bottom surface of the adjusting plate (20) and the bottom of the cylinder (7); a scraping hole (8) is arranged on the adjusting plate (20); a lower liquid hole (9) and a wire-passing hole (21) are arranged on the bottom surface of the cylinder (7); the wire-passing hole (21) is located below the scraping hole (8); and the lower liquid hole (9) is located on the opposite side of the wire-passing hole (21).

7. A method for extracting and separating wheat pentosans according to claim 3, characterized in that: The driving mechanism comprises a first rotating shaft (11), a plurality of supporting rods (12), a supporting ring (13), and a plurality of fixing rods (14); one end of the plurality of supporting rods (12) is fixedly connected to the rotating shaft; the other ends of the plurality of supporting rods (12) are fixedly connected to the inner surface of the supporting ring (13); the plurality of fixing rods (14) are distributed around the outer surface of the supporting ring (13) at intervals; and the wires (2) are connected and distributed on the fixing rods (14) in sequence.

8. A method for extracting and separating wheat pentosans according to claim 7, characterized in that: The collecting mechanism comprises a collecting plate (15), a second rotating shaft (16), and a scraper (17); the rotating shaft is fixedly connected to the center of the collecting plate (15); a plurality of annular liquid collecting grooves (18) are concentrically arranged on the collecting plate (15); a part of the plate surface of the collecting plate (15) abuts against the wire (2); the scraper (17) is inclined; the scraper (17) is provided with a collecting groove for receiving liquid; the side of the scraper (17) is provided with scraping teeth (19) matching the liquid collecting groove (18); the scraping teeth (19) are inserted into the liquid collecting groove (18), and the side of the scraper (17) on the same side abuts against the plate surface of the collecting plate (15).

9. A method for extracting and separating wheat pentosans according to claim 8, characterized in that: There are two collecting mechanisms, which are respectively located on opposite sides of the silk thread (2), and the silk thread (2) is alternately connected to the left and right sides of the fixing rod (14).

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