Continuous ion exchange purification device for xylose stock solution

Abstract

The invention belongs to the technical field of xylose preparation, and particularly provides a xylose stock solution continuous ion-exchange purification device which comprises a plurality of ion-exchange tanks which are communicated through pipelines to form a continuous ion-exchange purification system, the ion-exchange tank located at the head end is communicated with a xylose stock solution inlet pipe, and the ion-exchange tank located at the tail end is communicated with a xylose stock solution outlet pipe; an ion exchange tank inlet is formed in the top of the ion exchange tank, a plurality of supporting plates are fixedly connected to the middle of the side wall of the ion exchange tank, a first electrode column is fixed to one supporting plate and electrically connected to a power source, an electrode column connecting frame is fixedly connected to the bottom of the supporting plate, and an electrode base is arranged on the top of the electrode column connecting frame and electrically connected to the power source. A supporting frame is fixed to the end of the supporting plate, a resin cage is detachably fixed to the supporting frame, resin is arranged in the resin cage, a second electrode column is fixed in a cage body of the resin cage and electrically connected with the electrode base, and an ion exchange tank outlet is formed in the bottom of the ion exchange tank. The device can improve the purification degree and accelerate the purification efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of xylose preparation, and particularly relates to a continuous ion exchange purification device for xylose stock solution. BACKGROUND

[0002] Xylose is a five-carbon sugar extracted from plant raw materials such as corn cob and sugar cane residue. In the production process, after the raw materials are subjected to hydrolysis, neutralization, decolorization and other steps, the obtained liquid is called xylose stock solution, which contains xylose and a small amount of impurities (such as inorganic salts, organic acids, pigments, etc.). Ion exchange is a process of purifying xylose solution by adsorbing ion impurities in the solution by resin. The xylose stock solution passes through a cation column and an anion column in turn, and the impurities are adsorbed by the resin, and the effluent is the purified xylose solution.

[0003] The resin plays a major role in adsorption in this process, but the resin mainly relies on passive adsorption of ions by concentration gradient, and has weak ion capture ability for low concentration ions, long purification period. At the same time, the used resin can be repeatedly used after treatment, but it needs to be soaked in acid and alkali solution for a long time, which can accelerate the swelling and deformation of the resin, reduce the service life, and repeated ion exchange-regeneration cycle can cause the structure of the resin to fatigue and break, and the exchange capacity to decay quickly. SUMMARY

[0004] In view of the above defects, the present application provides a continuous ion exchange purification device for xylose stock solution, which can improve the purification degree and accelerate the purification efficiency.

[0005] To achieve the above object, the present application provides the following technical scheme: a continuous ion exchange purification device for xylose stock solution, comprising a plurality of ion exchange tanks, a plurality of ion exchange tanks are connected by pipelines to form a continuous ion exchange purification system, an ion exchange tank located at the first end of the continuous ion exchange purification system is connected with a xylose stock solution inlet pipe, and an ion exchange tank located at the end of the continuous ion exchange purification system is connected with a xylose stock solution outlet pipe. The top of the ion exchange tank is provided with an ion exchange tank inlet, a plurality of support plates are fixedly connected to the middle of the side wall of the ion exchange tank, one of the support plates is fixedly connected with a first electrode column, the first electrode column is electrically connected to a power supply, the bottom of the support plate is fixedly connected with an electrode column connecting frame, the top of the electrode column connecting frame is fixedly connected with an electrode base, the electrode base is electrically connected to the power supply, the end of the support plate is fixedly connected with a support frame, a resin cage is detachably fixed on the support frame, resin is arranged in the resin cage, a second electrode column is fixedly arranged in the cage body of the resin cage, the second electrode column is electrically connected to the electrode base, and the bottom of the ion exchange tank is provided with an ion exchange tank outlet.

[0006] As a further improvement of the application, the cation exchange tank and the anion exchange tank are provided, the resin cage arranged in the cation exchange tank is a cation resin cage, the resin cage arranged in the anion exchange tank is an anion resin cage, the first electrode column in the cation exchange tank is an anode column, the second electrode column in the cation resin cage is a cathode column, the first electrode column in the anion exchange tank is a cathode column, and the second electrode column in the anion resin cage is an anode column.

[0007] As a further improvement of the application, the cation resin tank, the anion resin tank and the clear liquid tank are further provided, the cation resin tank is consistent with the cation exchange tank, the cation resin tank is communicated to the acid liquid storage tank, the anion resin tank is consistent with the anion exchange tank, and the anion resin tank is communicated to the alkali liquid storage tank.

[0008] As a further improvement of the application, only the support plate and the support frame are arranged in the cleaning tank.

[0009] As a further improvement of the application, the outlet of the cation resin tank, the anion resin tank and the clear liquid tank are respectively communicated to the acid liquid waste tank, the alkali liquid waste tank and the clear liquid waste tank.

[0010] As a further improvement of the application, the upper cage body and the lower cage body are fixedly connected through the bolts and nuts matched at the upper cage body connecting flange and the lower cage body connecting flange.

[0011] As a further improvement of the application, a plurality of clamping grooves are arranged on the support frame, the lower cage body connecting flange is in a wave shape, and the lower cage body connecting flange is matched in the clamping groove of the support frame.

[0012] As a further improvement of the application, the first electrode column is arranged in the first electrode lead cavity arranged in the support plate, and the first electrode column is electrically connected to the power supply through the power supply connecting line arranged in the first electrode lead cavity.

[0013] As a further improvement of the application, the first electrode lead cavity is communicated to the second electrode lead cavity arranged in the electrode column connecting frame, and the second electrode column is electrically connected to the power supply through the power supply connecting line sequentially penetrating through the second electrode lead cavity and the first electrode lead cavity.

[0014] The application has the following beneficial effects: 1. By arranging the electrode column in the exchange tank, the electrode column generates an electric field, the electric field drives the target ions to migrate to the resin in a directional manner, thereby increasing the ion concentration at the resin and improving the adsorption efficiency. At the same time, the low-concentration ions can be affected by the electric field, and the low-concentration ions are gathered near the resin, thereby improving the purification degree of the wood sugar stock solution.

[0015] 2. By setting electrode column in the ion exchange tank and acid-base resin tank for soaking resin, the absorption speed of resin can be accelerated, the soaking time of resin in single solution can be reduced, the deformation degree can be reduced, so that the resin can return to the resin tank as soon as possible after ion exchange in the ion exchange tank, and the number of resin recycling is improved.

[0016] 3. By designing the connection structure of the resin cage and the support frame, the electrode column inside the resin cage can be accurately inserted into the electrode base when the resin cage is installed, and when misaligned, there will be a certain distance between the bottom of the resin cage and the electrode base, which protects the electrode base and its connection structure and improves the service life. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the schematic diagram of the xylose original liquid continuous ion exchange purification device of the present application; Figure 2 is the schematic diagram of the ion exchange tank installation structure; Figure 3 is the schematic diagram of the ion exchange tank internal structure; Figure 4 is the schematic diagram of the upper cage body structure; Figure 5 is the schematic diagram of the lower cage body structure; Figure 6 is the schematic diagram of the resin cage assembly structure.

[0018] In the figure: 1-xylose original liquid inlet pipe; 2-ion exchange tank, 201-first electrode column, 202-supporting plate, 203-power supply connecting line, 204-electrode column connecting frame, 205-electrode base, 206-upper cage body, 2061-upper cage body connecting flange, 207-supporting frame, 208-second electrode column, 209-lower cage body, 2091-lower cage body connecting flange; 3-liquid outlet pump, 4-connection pipe, 5-xylose original liquid outlet pipe, 6-acid liquid inlet pipe, 7-positive resin tank, 8-acid liquid outlet pipe, 9-alkali liquid inlet pipe, 10-negative resin tank, 11-alkali liquid outlet pipe, 12-clear liquid inlet pipe, 13-clear liquid tank, 14-clear liquid outlet pipe, 16-clear liquid waste liquid tank, 17-alkali liquid waste liquid tank, 18-acid liquid waste liquid tank, 19-clear liquid storage tank, 20-alkali liquid storage tank, 21-acid liquid storage tank. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application. The directional terms mentioned in the following examples, such as up, down, left, right, front or back, etc., are only the directions of the drawings. Therefore, the directional terms used are used to illustrate and not to limit the present application, and in all examples, the same reference numerals represent the same elements.

[0020] Please refer to Figure 1 The present application provides a continuous ion exchange purification device for xylose stock solution, comprising a plurality of ion exchange tanks 2, a cation resin tank 7, an anion resin tank 10 and a clear liquid tank 13.

[0021] The ion exchange tank 2 is internally provided with ion exchange resin. The bottom of the ion exchange tank 2 is provided with a liquid outlet, and the ion exchange liquid outlet pump 3 is arranged at the liquid outlet. The inlet end of the ion exchange liquid outlet pump 3 is communicated to the liquid outlet, and the outlet end of the ion exchange liquid outlet pump 3 is communicated to another ion exchange tank 2 through the connecting pipe 4, forming a continuous ion exchange purification system. The ion exchange tank 2 located at the head of the continuous ion exchange purification system is communicated with the xylose stock solution inlet pipe 1, and the ion exchange tank 2 located at the tail of the continuous ion exchange purification system is communicated with the xylose stock solution outlet pipe 5.

[0022] The ion exchange tank 2 comprises a cation ion exchange tank and an anion ion exchange tank.

[0023] As a further explanation of the present embodiment, the cation ion exchange tank and the anion ion exchange tank are communicated through the connecting pipe 4 as needed, forming different continuous ion exchange purification systems. Thus, the xylose stock solution introduced from the xylose stock solution inlet pipe 1 is purified through different continuous ion exchange purification systems, realizing one exchange of cation-two exchange of anion-three exchange of cation-four exchange of anion, or one exchange of cation-two exchange of anion-three exchange of cation-four exchange of anion, to remove the cations and anions in the xylose stock solution alternately, or to remove the cations first and then the anions, to obtain the purified xylose stock solution, which is then discharged from the xylose stock solution outlet pipe 5.

[0024] The ion exchange tank 2 is in the shape of a cylinder, and the top is provided with an ion exchange tank inlet for introducing the xylose stock solution into the ion exchange tank 2.

[0025] The ion exchange tank 2 is provided with a support structure in the middle for installing the resin cage. The support structure comprises four support plates 202, one end of which is fixedly connected to the side wall of the ion exchange tank 2 and is arranged in a circumferential array along the tank body of the ion exchange tank 2.

[0026] One of the support plates 202 is internally provided with a first electrode lead cavity, and the first electrode lead cavity is internally provided with a power supply connection line 203. The top of this support plate 202 is provided with a first electrode column 201, and the first electrode column 201 is electrically connected to the power supply connection line 203 inside the first electrode lead cavity.

[0027] The other end of the four support plates 202 is fixedly connected with a support frame 207, the frame of the support frame 207 is in the shape of a circular ring, and a plurality of clamping grooves are formed in the frame of the support frame 207 and arranged in a circumferential array.

[0028] The bottom of the support frame 207 near the side of the first electrode lead cavity is provided with an electrode column connecting frame 204, the inside of the electrode column connecting frame 204 is provided with a second electrode lead cavity, the second electrode lead cavity is in communication with the first electrode lead cavity, and the power supply connecting wire 203 extends into the second electrode lead cavity. The shape of the electrode column connecting frame 204 is L-shaped, the end of the bottom plate of the electrode column connecting frame 204 is provided with an electrode base 205, the electrode base 205 is a plug-in type base, and the electrode base 205 is electrically connected with the power supply connecting wire 203 in the second electrode lead cavity. The electrode base 205 is located at the center of the ion exchange tank 2.

[0029] A resin cage is mounted on the support structure. The resin cage includes an upper cage body 206 and a lower cage body 209, and the upper cage body 206 and the lower cage body 209 are buckled and both are in a mesh structure. The upper cage body connecting flange 2061 provided at the bottom of the upper cage body 206 is in the shape of a circular ring, and a plurality of first fixing holes are formed in the upper cage body connecting flange 2061. The lower cage body 209 is provided with a lower cage body connecting flange 2091 with second fixing holes at the top, which is in alignment with the first fixing holes of the upper cage body 206 and is fastened by bolts and nuts.

[0030] The lower cage body connecting flange 2091 of the lower cage body 209 is provided in a wave shape protruding downward at the bottom, and is clamped in the clamping groove formed in the support frame 207.

[0031] The second electrode column 208 is provided at the inside center of the lower cage body 209, the top of the second electrode column 208 extends to the upper part of the upper cage body 206 and leaves a certain distance from the top of the upper cage body 206. The bottom of the second electrode column 208 is plugged into the electrode base 205. Resin particles are arranged in the resin cage, and after the resin cage is mounted, the first electrode column 201 is located outside the resin cage.

[0032] The ion exchange tank 2 is provided with an ion exchange tank outlet at the bottom.

[0033] In the cation ion exchange tank, the corresponding resin cage is a cation resin cage, and the resin in the cation resin cage is activated into H+ form cation exchange resin by being soaked and washed by an acidic solution. The first electrode column 201 in the cation ion exchange tank is an anode column, which can be made of titanium coated with ruthenium or titanium coated with platinum, and the first electrode column 201 is connected to the positive electrode of the power supply through a power supply line. The second electrode column 208 in the cation resin cage is a cathode column, which can be made of graphite or stainless steel and is externally sprayed with a protective layer such as a Pt and Ti composite coating, and the second electrode column 208 is connected to the negative electrode of the power supply through a power supply line.

[0034] As a further explanation of the present embodiment, the cation exchange resin activated as H+ form carries negative charge sites, which can adsorb positive charge ions in the xylose original solution by ion exchange. At the same time, since the second electrode column 208 inside the cation resin cage is a cathode column connected to the negative pole of the power supply, after electrification, the electric field formed accelerates ion migration, making cations move faster to the cathode column, thereby enriching and being adsorbed by the cation exchange resin outside it. By applying an electric field to guide the movement of ions in the xylose original solution, the adsorption rate of the resin is accelerated, and the ability of the resin to adsorb low-concentration ions can also be improved. At the same time, the absorption performance of the resin is promoted, which can reduce the degree of deformation of the resin, allowing it to be used multiple times.

[0035] In the anion ion exchange tank, the corresponding resin cage is an anion resin cage, and the resin in the anion resin cage is soaked by washing with an alkaline solution, and is activated as an anion exchange resin in the form of OH-. The first electrode column 201 in the anion ion exchange tank is a cathode column, and the first electrode column 201 is connected to the negative pole of the power supply through the power supply line. The second electrode column 208 in the anion ion exchange tank is an anode column, and the second electrode column 208 is connected to the positive pole of the power supply through the power supply line.

[0036] As a further explanation of the present embodiment, the cation exchange resin activated as H+ form carries negative charge sites, which can adsorb positive charge ions in the xylose original solution by ion exchange. At the same time, since the second electrode column 208 inside the cation resin cage is a cathode column connected to the negative pole of the power supply, after electrification, the electric field formed accelerates ion migration, making cations move faster to the cathode column, thereby enriching and being adsorbed by the cation exchange resin outside it. By applying an electric field to guide the movement of ions in the xylose original solution, the adsorption rate of the resin is accelerated, and the ability of the resin to adsorb low-concentration ions can also be improved. At the same time, the absorption performance of the resin is promoted, which can reduce the degree of deformation of the resin, allowing it to be used multiple times.

[0037] The structure and electrode column of the anion resin tank 7 are consistent with those of the cation ion exchange tank. The anion resin tank 7 is provided with an anion resin tank inlet at the top, which is connected to the acid outlet of the acid liquid storage tank 21 through the acid liquid inlet pipe 6. The acid liquid storage tank 21 is provided with an acid liquid pump at the acid liquid outlet. The anion resin tank 7 is provided with an anion resin tank outlet at the bottom, which is provided with a liquid outlet valve and is connected to the acid liquid waste tank 18 through the acid liquid outlet pipe 8.

[0038] As a further explanation of the present embodiment, the used cation resin cage is placed in the anion resin tank 7, and an acidic solution is introduced into the anion resin tank 7, and then the power supply is connected. The cathode column inside the cation resin cage will attract H+ in the acidic solution to migrate quickly into the cation exchange resin, and be absorbed by the cation exchange resin. At the same time, O 2 and release H+, which can maintain the acidity of the solution, so that the concentration of H+ in the solution is higher, which can accelerate the absorption of the cation exchange resin and reduce the degree of deformation caused by long-term soaking in the solution, thereby prolonging the service life of the cation exchange resin.

[0039] The structure and electrode column arrangement of the negative resin tank 10 are consistent with those of the anion ion exchange tank. The negative resin tank 10 is provided with a negative resin tank inlet at the top, which is connected to the alkali outlet of the alkali storage tank 20 through the alkali inlet pipe 9. The alkali outlet of the alkali storage tank 20 is provided with an alkali pump. The negative resin tank 10 is provided with a negative resin tank outlet at the bottom, which is provided with a liquid outlet valve. The negative resin tank outlet is connected to the alkali waste tank 17 through the alkali outlet pipe 11.

[0040] As a further explanation of the present embodiment, the used anion resin cage is placed in the negative resin tank 10, and an alkaline solution is introduced into the negative resin tank 10. Then the power supply is connected. The anode column inside the anion resin cage will attract OH- in the alkaline solution to migrate quickly into the anion exchange resin, and be absorbed by the anion exchange resin. At the same time, the cathode generates H 2 and releases OH-, which can maintain the alkalinity of the solution, making the OH- concentration in the solution higher, accelerating the absorption of the anion exchange resin, reducing the deformation degree caused by long-term soaking of the activated solution, and prolonging the service life.

[0041] The structure of the clear liquid tank 13 is similar to that of the ion exchange tank 2, except that the clear liquid tank 13 is only provided with a support plate 202 and a support frame 207, without electrodes and connecting wires. The clear liquid tank 13 is provided with a clear liquid tank inlet at the top, which is connected to the clear liquid storage tank 19 through the clear liquid inlet pipe 12. The clear liquid outlet of the clear liquid storage tank 19 is provided with a clear liquid pump. The clear liquid tank 13 is provided with a clear liquid tank outlet at the bottom, which is provided with a clear liquid valve. The clear liquid tank outlet is connected to the clear liquid waste tank 16 through the clear liquid outlet pipe 14.

[0042] The working principle and use process of the present embodiment are as follows: The cation resin cage and the anion resin cage are filled with resin, and are placed inside the cation resin tank 7 and the negative resin tank 10, respectively. Acidic and alkaline solutions are injected into the cation resin tank 7 and the negative resin tank 10 from the acid storage tank 21 and the alkali storage tank 20, respectively. The acidic and alkaline solutions completely cover the resin cages and the electrode columns, and then the electrode columns are connected to the power supply. The resin in the cation resin cage fully absorbs H+ in the solution and is activated as H+ form cation exchange resin. The resin in the anion resin cage fully absorbs OH- in the solution and is activated as OH- form anion exchange resin. After the activation of the resin, the cation resin cage and the anion resin cage are first placed in the clear liquid tank 13 containing deionized water for standing, and then are placed in the cation ion exchange tank and the anion ion exchange tank, respectively.

[0043] The cation ion-exchange tank and the anion ion-exchange tank are connected as required to form a continuous ion-exchange purification system. The xylose raw solution inlet pipe 1 guides the xylose raw solution into the continuous ion-exchange purification system, and the xylose raw solution passes through each ion-exchange tank 2 in turn, with the height always being higher than the resin cage and the electrode column in each ion-exchange tank 2.

[0044] The electrode column in the ion-exchange tank 2 is connected to the power supply, the xylose raw solution enters each ion-exchange tank 2, and the positive and negative ions in the xylose raw solution are fully absorbed by the resin in the resin cage in the ion-exchange tank 2, to obtain a purified xylose solution, which is then discharged. During the purification of the xylose raw solution, the resin in the resin cage gradually becomes saturated and needs to be taken out, re-put into the cation resin tank 7 and the anion resin tank 10, regenerated by an acidic solution and an alkaline solution to restore the adsorption capacity, washed through the clear liquid tank 13, and then re-installed in the ion-exchange tank 2 for re-adsorption.

[0045] At the same time, the acidic solution in the cation resin tank 7, the alkaline solution in the anion resin tank 10, and the deionized water in the clear liquid tank 13 need to be replaced regularly, the waste liquid is discharged into the corresponding waste liquid tank, and then new liquid is re-injected from the liquid storage tank.

[0046] The above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned implementation measures. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the technical field, some improvements and refinements without departing from the principles of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. A continuous ion-exchange purification device for xylose stock solution, characterized in that, It includes several ion exchange tanks (2), and the several ion exchange tanks (2) are connected by pipelines to form a continuous ion exchange purification system. The ion exchange tank (2) located at the beginning of the continuous ion exchange purification system is connected to the xylose stock solution inlet pipe (1), and the ion exchange tank (2) located at the end of the continuous ion exchange purification system is connected to the xylose stock solution outlet pipe (5). The top of the separation tank (2) is provided with a separation tank inlet. Several support plates (202) are fixedly connected to the middle of the side wall of the separation tank (2). A first electrode post (201) is fixedly connected to one of the support plates (202). The first electrode post (201) is electrically connected to the power source. An electrode post connecting frame (204) is fixedly connected to the bottom of the support plate (202). An electrode base (205) is fixedly connected to the top of the electrode post connecting frame (204). The electrode base (205) is electrically connected to the power source. A support frame (207) is fixedly connected to the end of the support plate (202). A resin cage is detachably fixed on the support frame (207). Resin is provided inside the resin cage. A second electrode post (208) is fixed inside the cage of the resin cage. The second electrode post (208) is electrically connected to the electrode base (205). A separation tank outlet is provided at the bottom of the separation tank (2).

2. The continuous ion exchange purification device for xylose stock solution according to claim 1, characterized in that, The ion exchange tank (2) includes a cation exchange tank and an anion exchange tank. The resin cage inside the cation exchange tank is a cation resin cage, and the resin cage inside the anion exchange tank is an anion resin cage. The first electrode column (201) inside the cation exchange tank is an anode column, and the second electrode column (208) inside the cation resin cage is a cathode column. The first electrode column (201) inside the anion exchange tank is a cathode column, and the second electrode column (208) inside the anion resin cage is an anode column.

3. The continuous ion exchange purification device for xylose stock solution according to claim 2, characterized in that, It also includes a cation exchange resin tank (7), an anion exchange resin tank (10), and a clear liquid tank (13). The cation exchange resin tank (7) has the same structure as the cation exchange tank and is connected to the acid storage tank (21). The anion exchange resin tank (10) has the same structure as the anion exchange tank and is connected to the alkali storage tank (20).

4. The continuous ion exchange purification device for xylose stock solution according to claim 3, characterized in that, The clear liquid tank (13) is equipped with only a support plate (202) and a support frame (207).

5. The continuous ion exchange purification apparatus for xylose stock solution according to claim 4, characterized in that, The outlets of the cation resin tank (7), anion resin tank (10) and clear liquid tank (13) are respectively connected to the acid waste liquid tank (18), the alkali waste liquid tank (17) and the clear liquid waste liquid tank (16).

6. The continuous ion exchange purification apparatus for xylose stock solution according to claim 1, characterized in that, The resin cage includes an upper cage body (206) and a lower cage body (209), which are fixedly connected by bolts and nuts at the upper cage body connecting flange (2061) and the lower cage body connecting flange (2091).

7. The continuous ion exchange purification apparatus for xylose stock solution according to claim 6, characterized in that, The support frame (207) has several engaging grooves, and the lower cage connecting flange (2091) is wavy in shape. The lower cage connecting flange (2091) fits into the engaging groove of the support frame (207).

8. The continuous ion exchange purification apparatus for xylose stock solution according to claim 1, characterized in that, The support plate (202) provided with the first electrode post (201) has a first electrode wire cavity inside, and the first electrode post (201) is electrically connected to the power supply through a power connection line (203) provided inside the first electrode wire cavity.

9. The continuous ion exchange purification apparatus for xylose stock solution according to claim 8, characterized in that, The first electrode wire cavity is connected to the second electrode wire cavity disposed inside the electrode post connecting frame (204), and the second electrode post (208) is electrically connected to the power supply through a power connection line (203) that passes through the second electrode wire cavity and the first electrode wire cavity in sequence.

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