A decolorization and filtering device for xylose hydrolyzate and a decolorization and filtering method thereof

Abstract

The present invention discloses a xylose hydrolyzate decolorization and filtration device. The xylose hydrolyzate enters a filter to be cleaned and filtered to form a waste carbon liquid with a transmittance of 7% to 10%. The waste carbon liquid enters a filter press and is filtered to form a plate-frame liquid. The plate-frame liquid enters a filter to be filtered to form a pre-decolorization liquid with a transmittance of 30% to 35%. The pre-decolorization liquid enters a decolorization tank and is mixed with new carbon added to the decolorization tank to form a new carbon liquid. The new carbon liquid enters a standby filter and is filtered to form a decolorization liquid with a transmittance greater than or equal to 65%. The present invention also discloses a method for decolorization and filtration of xylose hydrolyzate using the device. The present invention effectively reduces the pollution of carbon powder to the surrounding environment, effectively performs decolorization and filtration treatment on the xylose hydrolyzate, the equipment occupies less space, and the decolorization and filtration process is carried out in a sealed environment throughout the process, reducing the pollution to the surrounding environment.

Description

Technical Field

[0001] The invention belongs to the technical field of xylose decolorization, and particularly relates to a xylose hydrolyzate decolorization filtering device and a decolorization filtering method thereof. Background Art

[0002] In the xylose production industry, corn cobs are the main raw material for producing xylose. Because corn cobs contain a large amount of natural pigments, they will have a serious impact on the appearance of the finished xylose. Therefore, the hydrolyzed liquid needs to be decolorized. In the conventional decolorization process, the utilization rate of activated carbon is low, and the decolorization of the hydrolyzed liquid is not thorough. The patent with publication number CN202226866U discloses a xylose hydrolyzate decolorization system device. The original one-time decolorization device is changed to a three-time decolorization device to solve the problems of large load of ion exchange resin, short service life of ion exchange resin, high consumption of raw and auxiliary materials, and ultimately high production cost of xylose. However, this set of equipment needs to be placed on three floors, occupies a large space, and requires the assistance of multiple people; in addition, the system uses three sets of plate and frame filter presses, and the splashing of dry carbon when removing the filter cake will pollute the surrounding environment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a xylose hydrolyzate decolorization and filtration device and a decolorization and filtration method thereof, so as to improve the utilization rate of activated carbon and improve the problem of incomplete decolorization of the hydrolyzate; moreover, the equipment is centralized and occupies less space, and the intermediate processes are all carried out in a sealed equipment pipeline, thereby reducing pollution to the surrounding environment.

[0004] The present invention is implemented in this way, providing a xylose hydrolyzate decolorization and filtration device, comprising a decolorization tank, a filtration unit, a filter press and a storage tank, wherein the filtration unit comprises at least three filters connected in parallel, and the at least three filters reciprocate between three working states of standby, ready for filtering and ready for cleaning, wherein at least one filter is a filter to be cleaned in a ready for cleaning state, at least one filter is a filter to be filtered in a ready for filtering state, and at least one filter is a standby filter in a standby state, wherein the filter to be cleaned contains waste carbon that has been used twice, and in The filter to be filtered contains old charcoal that has been used once, and the filter to be cleaned becomes a standby filter after filtering and cleaning again; the filter to be cleaned filters the incoming xylose hydrolyzate to obtain waste charcoal liquid, the filter press (3) presses the incoming waste charcoal liquid to form plate-frame liquid, the filter to be filtered filters the incoming plate-frame liquid to form pre-decolorized liquid, the pre-decolorized liquid enters the decolorization tank and is mixed with new charcoal added in the decolorization tank to form new charcoal liquid, the standby filter filters the incoming new charcoal liquid to form decolorized liquid, and the storage tank temporarily stores the decolorized liquid.

[0005] Furthermore, the filter to be cleaned, the filter to be filtered and the filter to be used are all provided with a hydrolyzed liquid pipeline, a new carbon liquid pipeline, a plate and frame liquid pipeline, a pre-decolorization liquid pipeline, a decolorization liquid pipeline and a waste carbon liquid pipeline; a hydrolyzed liquid valve is provided on the hydrolyzed liquid pipeline, a new carbon liquid valve is provided on the new carbon liquid pipeline, a plate and frame liquid valve is provided on the plate and frame liquid pipeline, a pre-decolorization liquid valve is provided on the pre-decolorization liquid pipeline, a decolorization liquid valve is provided on the decolorization liquid pipeline, and a waste carbon liquid valve is provided on the waste carbon liquid pipeline.

[0006] Furthermore, a first pump body is provided on the waste carbon liquid pipeline and is connected to the inlet of the filter press.

[0007] Furthermore, a second pump body is provided on the plate-frame liquid pipeline and is connected to the outlet of the filter press.

[0008] Furthermore, a third pump body is provided on the new carbon liquid pipeline and is connected with the outlet of the decolorization tank.

[0009] Furthermore, a fourth pump body is provided on the pre-decolorization pipeline and is connected to the inlet of the decolorization tank.

[0010] Furthermore, a stirrer is provided on the decolorizing tank.

[0011] The present invention is implemented by providing a xylose hydrolyzate decolorization and filtration method, which uses the xylose hydrolyzate decolorization and filtration device as described above, and comprises the following steps:

[0012] Step 1: Open the valve, and the xylose hydrolyzate enters the filter to be cleaned through the hydrolyzate pipeline, and then carries the waste carbon in the filter to be cleaned through the waste carbon liquid valve into the waste carbon liquid pipeline. The hydrolyzate is decolorized and filtered to become waste carbon liquid. After the decolorization and filtration of the hydrolyzate, its light transmittance is increased from 0 to 7%~10%, and the filter to be cleaned is cleaned and its state is changed from to be cleaned to standby;

[0013] Step 2: input the waste carbon liquid in the waste carbon liquid pipeline into the filter press for filtering, and the clear liquid filtered out is the plate and frame liquid;

[0014] Step 3, open the plate and frame liquid valve, input the plate and frame liquid in the plate and frame liquid pipeline into the filter to be filtered, the plate and frame liquid is filtered through the old carbon filter cake in the filter to be filtered and enters the pre-de-liquid pipeline through the pre-de-liquid valve, the plate and frame liquid is decolorized and filtered to become pre-de-liquid, the state of the filter to be filtered is changed from to be filtered to to be cleaned, and the light transmittance of the plate and frame liquid is increased from 7%~10% to 30%~35% after decolorization and filtration;

[0015] Step 4: Input the pre-decolorization liquid in the pre-decolorization liquid pipeline into the decolorization tank, add new carbon and stir for a certain period of time, and then enter the new carbon liquid pipeline, and the pre-decolorization liquid is mixed with the new carbon to become new carbon liquid;

[0016] Step 5: Open the new carbon liquid valve, and the new carbon liquid enters the standby filter from the new carbon liquid pipeline. The filtered clear liquid is a decolorized liquid with a light transmittance of ≥65%, which enters the decolorized liquid pipeline from the decolorized liquid valve. The filtered new carbon liquid becomes decolorized liquid, and the state of the standby filter changes from standby to ready for filtration;

[0017] Step 6: Finally, the decolorized liquid in the decolorized liquid pipeline is collected into a storage tank to complete the decolorization and filtration process of the entire hydrolyzate.

[0018] Compared with the prior art, the present invention provides a xylose hydrolyzate decolorization and filtration device and a decolorization and filtration method thereof, wherein the hydrolyzate enters a filter to be cleaned and filtered to form a waste carbon liquid with a transmittance of 7% to 10%, the waste carbon liquid discharged from the filter to be cleaned enters a filter press and is filtered to form a plate-frame liquid, the plate-frame liquid discharged from the filter press enters a filter to be filtered to form a pre-decolorization liquid with a transmittance of 30% to 35%, the pre-decolorization liquid discharged from the filter to be filtered enters a decolorization tank and is mixed with new carbon added in the decolorization tank to form new carbon liquid, the new carbon liquid discharged from the decolorization tank enters a standby filter to filter to form a decolorization liquid with a transmittance greater than 65%, and the decolorization liquid enters a storage tank for temporary storage. The present invention provides a filter press to effectively reduce the pollution of carbon powder to the surrounding environment, and the filter to be cleaned, the filter to be filtered and the standby filter can be provided to effectively decolorize and filter the xylose hydrolyzate, the equipment occupies less space, and the decolorization and filtration process is carried out in a sealed environment throughout the process, thereby reducing pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic plan view of the structural principle of a preferred embodiment of the xylose hydrolysate decolorization and filtration device of the present invention.

[0020] Figure 2 for Figure 1 Schematic diagram of the working principle. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] Please also refer to Figure 1 and Figure 2 As shown, a preferred embodiment of a xylose hydrolyzate decolorization and filtration device of the present invention is a xylose hydrolyzate decolorization and filtration device, comprising a decolorization tank 1, a filtration unit 2, a filter press 3 and a storage tank 7.

[0023] The filter unit 2 includes at least three filters connected in parallel. The at least three filters cycle back and forth between the three working states of standby, ready for filtering and ready for cleaning, wherein at least one filter is a filter 21 to be cleaned in a ready for cleaning state, at least one filter is a filter 22 to be filtered in a ready for filtering state, and at least one filter is a standby filter 23 in a standby state. The filter 21 to be cleaned contains waste carbon that has been used twice, and the filter 22 to be filtered contains old carbon that has been used once. The filter 21 to be cleaned is cleaned after filtering again and becomes the standby filter 23.

[0024] The xylose hydrolyzate enters the filter to be cleaned 21 for filtration to obtain waste carbon liquid, the waste carbon liquid enters the filter press 3 for filtration to form plate and frame liquid, the plate and frame liquid enters the filter to be filtered 22 for filtration to form pre-decolorized liquid, the pre-decolorized liquid enters the decolorization tank 1 and is mixed with the new carbon added in the decolorization tank 1 to form new carbon liquid, the new carbon liquid then enters the standby filter 23 for filtration to form decolorized liquid, and the decolorized liquid enters the storage tank 7 for temporary storage.

[0025] The filter to be cleaned 21, the filter to be filtered 22 and the standby filter 23 are all provided with a hydrolyzed liquid pipeline 41, a new carbon liquid pipeline 42, a plate-frame liquid pipeline 43, a pre-decolorized liquid pipeline 44, a decolorized liquid pipeline 45 and a waste carbon liquid pipeline 46. A hydrolyzed liquid valve 51 is provided on the hydrolyzed liquid pipeline 41, a new carbon liquid valve 52 is provided on the new carbon liquid pipeline 42, a plate-frame liquid valve 53 is provided on the plate-frame liquid pipeline 43, a pre-decolorized liquid valve 54 is provided on the pre-decolorized liquid pipeline 44, a decolorized liquid valve 55 is provided on the decolorized liquid pipeline 45, and a waste carbon liquid valve 56 is provided on the waste carbon liquid pipeline 46.

[0026] By setting and controlling the hydrolyzed liquid valve 51, the new carbon liquid valve 52 and the plate and frame liquid valve 53, as well as the pre-deliquid valve 54 and the waste carbon liquid valve 56, at least three filters can be switched in different working states and rotated among the working roles of the filter to be cleaned 21, the filter to be filtered 22 and the standby filter 23.

[0027] A first pump body 61 is also provided on the waste carbon liquid pipeline 46 and is connected to the inlet of the filter press 3. A second pump body 62 is also provided on the plate-frame liquid pipeline 43 and is connected to the outlet of the filter press 3. A third pump body 63 is also provided on the new carbon liquid pipeline 42 and is connected to the outlet of the decolorization tank 1. A fourth pump body 64 is also provided on the pre-decolorization pipeline 44 and is connected to the inlet of the decolorization tank 1.

[0028] The decolorizing tank 1 is provided with an agitator 8 to facilitate full mixing of the new charcoal and the feed liquid.

[0029] The following is a further explanation of the method for using the xylose hydrolysate decolorization and filtration device of the present invention through specific examples.

[0030] Example 1

[0031] The present invention also discloses a xylose hydrolyzate decolorization and filtration method, which uses the xylose hydrolyzate decolorization and filtration device as described above, and comprises the following steps:

[0032] Step 1: Open the valve 51 of the filter 21 to be cleaned, and the xylose hydrolyzate enters the filter 21 to be cleaned through the hydrolyzate pipeline 41. Figure 2 As shown by the middle arrow, the waste carbon in the filter 21 to be cleaned is then carried through the waste carbon liquid valve 56 into the waste carbon liquid pipeline 46. In this process, the hydrolyzed liquid uses the waste carbon to complete the first decolorization, and the hydrolyzed liquid is decolorized and filtered to become waste carbon liquid. After the decolorization and filtration of the hydrolyzed liquid, its light transmittance is increased from 0 to 7%~10%, and the filter 21 to be cleaned is cleaned and its state is changed from to be cleaned to standby.

[0033] Step 2: Input the waste carbon liquid in the waste carbon liquid pipeline 46 into the filter press 3 for filter pressing. The purpose of this process is to remove the waste carbon carried by the waste carbon liquid. The clear liquid filtered out is the plate and frame liquid.

[0034] Step 3, open the plate-frame liquid valve 53 of the filter 22 to be filtered, input the plate-frame liquid in the plate-frame liquid pipeline 43 into the filter 22 to be filtered, and the plate-frame liquid is filtered through the old carbon filter cake in the filter 22 to be filtered and enters the pre-de-liquid pipeline 44 through the pre-de-liquid valve 54. In this process, the plate-frame liquid uses the old carbon filter cake to complete the second decolorization, and the plate-frame liquid is changed to pre-de-liquid after decolorization filtration. The state of the filter 22 to be filtered is changed from to be filtered to to be cleaned, and the light transmittance of the plate-frame liquid is increased from 7%~10% to 30%~35% after decolorization filtration.

[0035] Step 4: Input the pre-decolorization liquid in the pre-decolorization liquid pipeline 44 into the decolorization tank 1, add new carbon such as Figure 2 As shown by the arrow in the middle, the mixture is stirred for a certain period of time and then enters the new carbon liquid pipeline 42. In this process, the pre-decolorized liquid is decolorized for the third time using the added new carbon, and the pre-decolorized liquid becomes the new carbon liquid.

[0036] Step 5: Open the new carbon liquid valve 52 of the standby filter 23, and the new carbon liquid enters the standby filter 23 from the new carbon liquid pipeline 42. The filtered clear liquid is a decolorized liquid with a light transmittance of ≥ 65%, and enters the decolorized liquid pipeline 45 from the decolorized liquid valve 55. The purpose of this process is to remove the old carbon in the new carbon liquid and form a filter cake on the filter plate of the filter. The filtered new carbon liquid becomes decolorized liquid, and the state of the standby filter 23 is changed from standby to ready for filtering.

[0037] Step 6: Finally, the decolorized liquid in the decolorized liquid pipeline 45 is collected into the storage tank 7, completing the decolorization and filtration process of the entire hydrolyzate.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A xylose hydrolyzate decolorization and filtration device, It is characterized in that The invention comprises a decolorizing tank (1), a filtering unit (2), a filter press (3) and a storage tank (7), wherein the filtering unit (2) comprises at least three filters connected in parallel, and the at least three filters are respectively subjected to reciprocating cycles between three working states: standby, ready for filtering and ready for cleaning, wherein at least one filter is a filter to be cleaned (21) in a ready for cleaning state, at least one filter is a filter to be filtered (22) in a ready for filtering state, and at least one filter is a standby filter (23) in a standby state, wherein the filter to be cleaned (21) contains waste carbon that has been used twice, and the filter to be filtered (22) contains waste carbon that has been used twice. The filter (21) to be cleaned contains old carbon that has been used once. After filtering again, it is cleaned to become a standby filter (23); the filter (21) to be cleaned filters the incoming xylose hydrolyzate to obtain waste carbon liquid, the filter press (3) filters the incoming waste carbon liquid to form plate-frame liquid, the filter (22) to be filtered filters the incoming plate-frame liquid to form pre-decolorized liquid, the pre-decolorized liquid enters the decolorization tank (1) and mixes with the new carbon added in the decolorization tank (1) to form new carbon liquid, the standby filter (23) filters the incoming new carbon liquid to form decolorized liquid, and the storage tank (7) temporarily stores the decolorized liquid.

2. The xylose hydrolyzate decolorization and filtration device according to claim 1, It is characterized in that The filter to be cleaned (21), the filter to be filtered (22) and the standby filter (23) are all provided with a hydrolyzed liquid pipeline (41), a new carbon liquid pipeline (42), a plate-frame liquid pipeline (43), a pre-decolorization pipeline (44), a decolorization liquid pipeline (45) and a waste carbon liquid pipeline (46); a hydrolyzed liquid valve (51) is provided on the hydrolyzed liquid pipeline (41); a new carbon liquid valve (52) is provided on the new carbon liquid pipeline (42); a plate-frame liquid valve (53) is provided on the plate-frame liquid pipeline (43); a pre-decolorization valve (54) is provided on the pre-decolorization pipeline (44); a decolorization liquid valve (55) is provided on the decolorization liquid pipeline (45); and a waste carbon liquid valve (56) is provided on the waste carbon liquid pipeline (46).

3. The xylose hydrolyzate decolorization and filtration device according to claim 2, It is characterized in that A first pump body (61) is also provided on the waste carbon liquid pipeline (46) and is connected to the inlet of the filter press (3).

4. The xylose hydrolyzate decolorization and filtration device according to claim 2, It is characterized in that A second pump body (62) is also provided on the plate-frame liquid pipeline (43) and is connected to the outlet of the filter press (3).

5. The xylose hydrolyzate decolorization and filtration device according to claim 2, It is characterized in that A third pump body (63) is also provided on the new carbon liquid pipeline (42) and is connected to the outlet of the decolorization tank (1).

6. The xylose hydrolyzate decolorization and filtration device according to claim 2, It is characterized in that A fourth pump body (64) is also provided on the pre-decolorization pipeline (44) and is connected to the inlet of the decolorization tank (1).

7. The xylose hydrolyzate decolorization and filtration device according to claim 1, It is characterized in that The decolorizing tank (1) is provided with a stirrer (8).

8. A method for decolorizing and filtering a xylose hydrolyzate, It is characterized in that The xylose hydrolyzate decolorization and filtration device according to any one of claims 2 to 7 comprises the following steps: Step 1, open the valve (51), the xylose hydrolyzate enters the filter to be cleaned (21) through the hydrolyzate pipeline (41), and then carries the waste carbon in the filter to be cleaned (21) through the waste carbon liquid valve (56) into the waste carbon liquid pipeline (46), the hydrolyzate is decolorized and filtered to become waste carbon liquid, and the light transmittance of the hydrolyzate after decolorization and filtration is increased from 0 to 7% to 10%, and the filter to be cleaned (21) is cleaned, and its state is changed from to be cleaned to standby; Step 2: inputting the waste carbon liquid in the waste carbon liquid pipeline (46) into the filter press (3) for filter pressing, and the clear liquid obtained by the filter pressing is the plate and frame liquid; Step 3, opening the plate-frame liquid valve (53), inputting the plate-frame liquid in the plate-frame liquid pipeline (43) into the filter to be filtered (22), the plate-frame liquid is filtered through the old carbon filter cake in the filter to be filtered (22) and enters the pre-de-liquid pipeline (44) through the pre-de-liquid valve (54), the plate-frame liquid is decolorized and filtered to become pre-de-liquid, the state of the filter to be filtered (22) is changed from being filtered to being cleaned, and the light transmittance of the plate-frame liquid is increased from 7%~10% to 30%~35% after being decolorized and filtered; Step 4: the pre-decolorization liquid in the pre-decolorization liquid pipeline (44) is input into the decolorization tank (1), new carbon is added and stirred for a certain period of time, and then enters the new carbon liquid pipeline (42), and the pre-decolorization liquid and the added new carbon are mixed to form new carbon liquid; Step 5, opening the new carbon liquid valve (52), the new carbon liquid enters the standby filter (23) through the new carbon liquid pipeline (42), the filtered clear liquid is a decolorized liquid with a light transmittance of ≥ 65%, and enters the decolorized liquid pipeline (45) through the decolorized liquid valve (55), the filtered new carbon liquid becomes decolorized liquid, and the state of the standby filter (23) is changed from standby to ready for filtration; Step 6: Finally, the decolorized liquid in the decolorized liquid pipeline (45) is collected into the storage tank (7), completing the decolorization and filtration process of the entire hydrolyzate.

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