CN216629758U

CN216629758U - Liquid phase simulated moving bed adsorption separation system

Info

Publication number: CN216629758U
Application number: CN202122823463.6U
Authority: CN
Inventors: 曲良龙; 陈士博; 田晓宝; 牟晓; 曲香玉; 韩秉功
Original assignee: Karamay Aneji Separation Technology Co ltd; Beijing Energy Engineering Technologies Co ltd
Current assignee: Karamay Aneji Separation Technology Co ltd; Beijing Energy Engineering Technologies Co ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-05-31
Anticipated expiration: 2031-11-17

Abstract

The utility model relates to the field of adsorption separation of liquid-phase simulated moving beds, and discloses a liquid-phase simulated moving bed adsorption separation system, which comprises: the device comprises m adsorption columns, n multi-channel combination valves, a circulating pump, a multi-channel material flow pipeline communicated with the multi-channel combination valves, and a circulating pipeline communicated with the circulating pump and the multi-channel combination valves; at least one adsorption column is arranged between two adjacent multi-channel combination valves, and the system is not provided with a flushing pipeline; m and n are positive integers respectively, and n is more than m. The system has compact and simple structure, can control the material inlet and outlet of each adsorption column by a special distribution pipeline provided by the multi-channel combination valve, and avoids the defect that the material needs to be washed when being switched due to the fact that a public pipeline needs to be arranged. The system can eliminate the time difference of the inlet and outlet material flows of the circulating liquid, and provides more stable operation and better separation effect.

Description

Liquid phase simulated moving bed adsorption separation system

Technical Field

The utility model relates to the field of adsorption separation, in particular to a liquid-phase simulated moving bed adsorption separation system.

Background

The simulated moving bed is a separation apparatus which performs a separation operation using the adsorption principle. The simulated moving bed technology is taken as a main representative of continuous chromatography, has the advantages of high production efficiency, low organic solvent consumption, large mass transfer driving force, convenience for automatic continuous production and the like, is widely applied to the fields of petrochemical industry, food industry, pharmacy and the like, and is a complex industrial process and a periodic process with a plurality of non-linearity, non-equilibrium, non-ideal and multi-degree of freedom of influencing factors.

The simulated moving bed divides the fixed adsorption bed into a plurality of sections, and the sections are filled with adsorbents. Each section is provided with an inlet and outlet pipeline, and the inlet and outlet of the inlet and outlet pipelines are controlled by a multi-channel rotary valve. CN100453867B discloses a 36-way rotary valve for a high performance liquid preparative chromatography simulated moving bed, the 36-way rotary valve is connected with a stepping motor provided with a synchronous pulley through a belt, the 36-way rotary valve mainly comprises a static disc and a housing arranged on the static disc, a transmission shaft is arranged between the static disc and the housing, one end of the transmission shaft is inserted into a central hole of the static disc, the other end of the transmission shaft penetrates out of the housing and is provided with another synchronous pulley, and the circumferential edges of the static disc and the housing are provided with sealing rings and are uniformly fixed; and a movable disc, a driving disc, a disc spring, an adjusting cushion block and a thrust bearing are sequentially arranged between the static disc and the housing from bottom to top. The 36-way rotary valve has compact structure and small dead volume, and greatly reduces the failure rate of the simulated moving bed equipment; however, the 36-channel rotary valve is expensive in cost, and since each channel needs to be flushed with a pipeline when different materials are switched with the switching of the simulated moving bed layer, a corresponding flushing system needs to be configured, the pipeline is very complicated, and the operation cost is increased. In addition, good sealing performance and flexible rotation between the movable disc and the housing are guaranteed, the possibility of material leakage is increased due to the contradiction, once leakage occurs, the whole simulated moving bed stops working, and the long-period operation capacity of the device is reduced. The prior art also adopts a plurality of program control valves to control different materials to enter the adsorption tower through a pipeline connected with each bed layer, and a pipeline flushing system is also required to be configured.

Therefore, there is a need to provide a new simulated moving bed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defect that a simulated moving bed in the prior art needs to be provided with a common pipeline and a common flushing pipeline, and provides a liquid-phase simulated moving bed adsorption separation system. This system provides the multichannel combination valve that has the special structural design of no dead volume, compares in prior art distributed setting and connects a plurality of adsorption columns, can make every adsorption column have business turn over material with special distributing pipe, the high-efficient work of every adsorption column of being convenient for and avoided setting up public pipeline on the current device and need the defect of washing.

In order to achieve the above object, the present invention provides a liquid-phase simulated moving bed adsorption separation system comprising: the device comprises m adsorption columns, n multi-channel combination valves, a circulating pump, a multi-channel material flow pipeline communicated with the multi-channel combination valves, and a circulating pipeline communicated with the circulating pump and the multi-channel combination valves;

at least one adsorption column is arranged between two adjacent multi-channel combination valves, and the system is not provided with a flushing pipeline; m and n are positive integers respectively, and n is more than m.

Preferably, the multi-channel combination valve includes: a valve body and a plurality of control valves disposed in the valve body; the valve body is provided with a mixing flow channel penetrating through the valve body and used for communicating the adsorption column; the valve core channel is vertically communicated with the mixing flow channel and penetrates through the outer wall of the valve body; and a material flow channel penetrating to the outer wall of the valve body is arranged on the side wall of each valve core channel.

Preferably, a plurality of the poppet passages are provided along a circumferential direction of the mixing flow passage.

Preferably, the plurality of poppet passages are disposed on the same or different horizontal planes along the central axis of the mixing channel.

Preferably, 1 control valve is provided in each spool passage.

Preferably, the flow channel is connected to the flow line for introducing or discharging different materials into or out of the mixing channel.

Preferably, the control valve is used for controlling the material flow in the material flow channel.

Preferably, the flow passage is arranged perpendicular to the spool passage.

Preferably, the valve body includes: 4 spool passages, 4 control valves and 4 material flow passages are correspondingly arranged.

Preferably, the 4 said flow channels comprise: the separation device comprises a raw material channel for introducing raw materials to be separated into the mixed flow channel, a desorbent channel for introducing a desorbent into the mixed flow channel, a raffinate channel for discharging raffinate from the mixed flow channel and an extract channel for discharging extract from the mixed flow channel.

Preferably, the 4 spool passages are arranged on different horizontal planes along the circumferential direction of the mixing flow passage and perpendicular to each other.

Preferably, through the plurality of material flow pipelines, the raw material channels of different multi-channel combination valves are communicated in parallel, the desorbent channels of different multi-channel combination valves are communicated in parallel, the raffinate channels of different multi-channel combination valves are communicated in parallel, and the extract channels of different multi-channel combination valves are communicated in parallel.

Preferably, the circulating pump is communicated with the 1 st multichannel combination valve and the nth multichannel combination valve through the circulating pipeline, and is used for circularly introducing materials discharged from the mixing flow channel of the nth multichannel combination valve into the mixing flow channel of the 1 st multichannel combination valve as circulating liquid.

Preferably, the system is divided into a plurality of functional zones in the direction from the 1 st to the nth of said multi-channel combination valves; each functional area comprises at least one adsorption column and the multi-channel combination valve.

Preferably, the adsorption column is filled with an adsorbent.

Through the technical scheme, the simulated moving bed system provided by the utility model can realize that the inflow or outflow materials in the adsorption columns are controlled through the multi-channel combination valve for each adsorption column. The multi-channel combined valve with a special structural design can reduce the dead volume, avoid the arrangement of a common pipeline on the existing device in the composition of the system, and avoid the arrangement of a flushing pipeline and flushing operation which have to be arranged for overcoming the material pollution of the common pipeline, so that the simulated moving bed system provided by the utility model has simpler structure and more convenient operation, increases the arrangement of a virtual bed layer, and improves the stability of the system and better separation effect.

Drawings

FIG. 1 is a simulated moving bed system according to one embodiment of the present invention;

FIG. 2 is a multi-channel combination valve according to an embodiment of the present invention;

FIG. 3 is a view of section A-A of FIG. 2;

fig. 4 is a schematic view of a structure of a simulated moving bed in the prior art.

Description of the reference numerals

1-adsorption column 2-multichannel combination valve 3-circulating pump

200-valve body 201-mixing flow passage 202-valve core passage

203-stream channel 10-first control valve 11-first line

20-second control valve 21-second line 30-third control valve

31 third line 40-fourth control valve 41-fourth line

7-material inlet and outlet pipe group 8-rotary valve 9-adsorption tower

10-flushing line 801-first delivery line 802-second delivery line

Detailed Description

The following describes the embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

In the present invention, the use of directional terms such as "up and down" generally means up and down as shown with reference to the drawings, unless otherwise specified.

In a preferred embodiment, as shown in FIG. 1, the present invention provides a liquid phase simulated moving bed adsorptive separation system comprising: the device comprises m adsorption columns 1, n multi-channel combination valves 2, a circulating pump 3, a multi-channel material flow pipeline communicated with the multi-channel combination valves 2, and a circulating pipeline communicated with the circulating pump 3 and the multi-channel combination valves 2;

wherein at least one adsorption column 1 is arranged between two adjacent multi-channel combination valves 2, and the system is not provided with a flushing pipeline; m and n are positive integers respectively, and n is more than m.

Preferably, n-m-1. For example, m may be 10 to 24, and accordingly n is 11 to 25, and n-m is 1, that is, in the present invention, the number of the multi-channel combination valves 2 is one more than the number of the adsorption columns 1, and as shown in fig. 1, from top to bottom, the multi-channel combination valves 2 are located at the top and bottom of the whole system. The actual stream volume of each of the adsorption columns 1 is equal.

In the utility model, different adsorption columns 1 are communicated through different multi-channel combination valves 2, which is equivalent to that each adsorption column 1 is provided with a control mechanism (namely the multi-channel combination valve 2) capable of distributing different material flows, thereby improving the separation efficiency and effect. Meanwhile, different multi-channel combination valves 2 are communicated through a plurality of material flow pipelines. The material flow pipelines which are communicated among a plurality of multi-channel combination valves 2 and are used for flowing the raw materials to be separated, the desorbent, the raffinate and the extract are shown in an example mode in FIG. 1; wherein the extract is a material flow containing a target component and a desorbent, and the raffinate is a material flow containing a component obtained after the target component is separated from the raw material to be separated and the desorbent. Meanwhile, the stream which is not discharged after undergoing adsorption and desorption in the system is discharged from the nth multi-channel combination valve 2 at the lowest part of the system to be taken as circulating liquid, passes through the circulating pipeline and is circulated back to the 1 st multi-channel combination valve 2 through the circulating pump 3. Further, the main lines for flowing different streams may be provided correspondingly.

In a preferred embodiment of the present invention, a plurality of the multi-channel combination valves 2 have the same structure. Preferably, the multi-channel combination valve 2 (as shown in fig. 2 and 3, wherein fig. 3 is a view of a section a-a in fig. 2) comprises: a valve body 200 and a plurality of control valves provided on the valve body; wherein, the valve body 200 is provided with a mixing flow channel 201 penetrating through the valve body 200 and used for communicating the adsorption column 1; a valve body passage 202 vertically communicating with the mixing flow passage 201 and penetrating to an outer wall of the valve body 200; on the side wall of each of the spool passages 202, there is a flow passage 203 that penetrates to the outer wall of the valve body.

In a preferred embodiment of the present invention, it is preferable that a plurality of the poppet passages 202 are provided along a circumferential direction of the mixing channel 201.

In a preferred embodiment of the present invention, it is preferable that a plurality of the poppet passages 202 are disposed on the same or different horizontal planes along the central axis of the mixing channel 201. When the valve body 200 is large enough, all the valve body passages 202 can be disposed along the circumferential direction of the mixing channel 201, that is, a plurality of the valve body passages 202 may be disposed on the same horizontal plane along the central axis of the mixing channel 201. If the valve body 200 is small enough to arrange all the spool passages 202 in the circumferential direction of the mixing channel 201, a plurality of the spool passages 202 may be grouped to be arranged on different horizontal planes along the central axis of the mixing channel 201.

In a preferred embodiment of the present invention, preferably, 1 control valve is provided in each spool passage 202.

In a preferred embodiment of the present invention, preferably, the control valve is used for controlling the material flow in the material flow channel. The control valve controls opening and closing of the material flow channel 203 to the mixing channel 201 in the valve core channel.

In the present invention, the system may further include a control mechanism for controlling the opening and closing of the control valves included in the plurality of multi-channel combination valves 2, and the control may be realized by program software.

In a preferred embodiment of the present invention, the flow channel 203 is preferably connected to the pipeline for introducing or discharging different materials into or out of the mixing channel 201.

In a preferred embodiment of the present invention, the material flow channel 203 is preferably perpendicular to the valve core channel 202.

In the present invention, on the valve body 200 of the

multi-channel combination valve

2, 1

spool channel

202, 1 control valve and 1 material flow channel 203 are correspondingly arranged in pairs. As shown in fig. 2 and 3, an example valve body 200 includes: 4 spool passageways, 4 control valves and 4 material flow passageways are correspondingly arranged.

In a preferred embodiment of the present invention, preferably, as shown in fig. 2 and 3, the 4 flow channels comprise: the separation device comprises a raw material channel for introducing raw materials to be separated into the mixed flow channel, a desorbent channel for introducing a desorbent into the mixed flow channel, a raffinate channel for discharging raffinate from the mixed flow channel and an extract channel for discharging extract from the mixed flow channel.

In a preferred embodiment of the present invention, preferably, as shown in fig. 2 and 3, 4 of the poppet passages are disposed on different horizontal planes along a circumferential direction of the mixing channel and perpendicular to each other. 4 spool passages 202, and correspondingly 4 flow passages 203, are provided in the valve body 200, as shown in fig. 3. Preferably, the valve body 200 is provided with 4 control valves, and the control valves are divided into two groups of control valves, and two control valves in each group are arranged in pairwise symmetrical distribution. For example, the valve body 200 is provided with a first control valve 10, a second control valve 20, a third control valve 30 and a fourth control valve 40; wherein, the first control valve 10 and the second control valve 20 are in a group and are distributed symmetrically in pairs; similarly, the third control valve 30 and the fourth control valve 40 are in another group and are symmetrically distributed in pairs. Furthermore, the two groups of control valve groups are arranged on different horizontal planes and are vertically arranged with each other. For example, as shown in fig. 2, the first control valve 10 and the second control valve 20 are on the same horizontal plane, while the third control valve 30 and the fourth control valve 40 are on the other same horizontal plane, which are not the same and are vertically disposed with respect to each other. Correspondingly, as shown in fig. 3, the 4 valve core channels 202 are also divided into two groups, each two of which are symmetrically distributed, and the two groups are not on the same horizontal plane and are vertically arranged.

In a preferred embodiment of the present invention, there are also provided 4 lines in pair communicating with the flow channel 203, corresponding to 4 control valves, respectively. For example, as shown in fig. 2, the first line 11 is provided in pair with the first control valve 10, the second line 21 is provided in pair with the second control valve 20, the third line 31 is provided in pair with the third control valve 30, and the fourth line 41 is provided in pair with the fourth control valve 40.

In a preferred embodiment of the present invention, as shown in fig. 2 and 3, it is preferable that the valve body 200 has 4 flow channels 203, which are a raw material channel for introducing a raw material to be separated into the mixed flow channel 201, a desorbent channel for introducing a desorbent into the mixed flow channel 201, a raffinate channel for discharging a raffinate from the mixed flow channel 201, and a draw liquid channel for discharging a draw liquid from the mixed flow channel 201, respectively. Referring to fig. 1, in the present invention, a first control valve 10 and a first line 11 may be provided at a lower portion of the multi-pass combination valve 2 for controlling introduction of a raw material to be separated, a second control valve 20 and a second line 21 may be provided at a lower portion of the multi-pass combination valve 2 for controlling introduction of a desorbent, a third control valve 30 and a third line 31 may be provided at an upper portion of the multi-pass combination valve 2 for controlling discharge of a raffinate, and a fourth control valve 40 and a fourth line 41 may be provided at an upper portion of the multi-pass combination valve 2 for controlling discharge of a extract. When the multi-channel combination valve 2 works, only one control valve controls the corresponding pipeline to be in an open state to realize feeding/discharging, and the other three control valves control the corresponding pipeline to be closed.

In a preferred embodiment of the present invention, as shown in fig. 1, it is preferable that the raw material channels included in different multi-channel combination valves 2 are connected in parallel, the desorbent channels included in different multi-channel combination valves are connected in parallel, the raffinate channels included in different multi-channel combination valves are connected in parallel, and the extract channels included in different multi-channel combination valves are connected in parallel. The parallel connection is realized through corresponding material flow pipelines, a material flow channel is provided, the system of the utility model is constructed, and the simulated moving bed adsorption separation of the mixed materials flowing into the system is realized.

In a preferred embodiment of the present invention, as shown in fig. 1, preferably, the circulation pump 3 is connected between the 1 st multi-channel combination valve (the uppermost multi-channel combination valve in fig. 1) and the nth multi-channel combination valve (the lowermost multi-channel combination valve in fig. 1) for circularly introducing the material discharged from the mixing flow channel of the nth multi-channel combination valve into the mixing flow channel of the 1 st multi-channel combination valve, so as to realize the circulating operation of the simulated moving bed. In the utility model, as shown in fig. 1, the uppermost multi-channel combination valve is the 1 st multi-channel combination valve, the lowermost multi-channel combination valve is the nth multi-channel combination valve, correspondingly, the uppermost adsorption column is the 1 st adsorption column, and the lowermost adsorption column is the mth adsorption column. Preferably, the number of the multi-channel combination valves is one more than the number of the adsorption columns. In the utility model, the n-th multi-channel combination valve which is one more than the adsorption column is arranged at the lowest part in the system, so that the operation of normal simulated moving bed adsorption separation can be realized, the synchronous consistency of the time of material flow in and out of each adsorption column in the system is also maintained, the time difference between the material flow in and out of the adsorption column caused by the circulation time of circulating liquid when the m-th adsorption column is switched with the 1 st adsorption column is eliminated, the continuity and the stability of the components of the circulating liquid are favorably maintained, and the separation effect of the adsorption system is favorably improved.

In a preferred embodiment of the present invention, preferably, the system is divided into a plurality of functional zones in a direction from the 1 st to the nth one of the multi-channel combination valves; each functional area comprises at least one adsorption column and the multi-channel combination valve. Can be divided into the same functional zones as those of the conventional simulated moving bed used for adsorption separation, such as a desorption zone, a refining zone, an adsorption zone and a buffer zone from top to bottom. Each of the multi-channel combination valves 2 is provided with a plurality of flow channels 202, and supplies or leads the flow of different stages of the adsorption separation to the mixing flow channel 201 under the on/off control of a control valve provided in the valve core channel 202, wherein the flow of the flow comes from or flows into the adsorption column 1 communicated with the multi-channel combination valve 2. By controlling the multi-channel combination valve 2 at different positions in the system, the inlet and outlet of different materials (such as raw materials to be separated, desorbent, raffinate and extract) into and out of the multi-channel combination valve 2 are periodically changed from top to bottom, so that the position of the materials entering or flowing out of the adsorption column 1 is changed, adsorption and desorption are repeatedly carried out, and the continuous separation of target products in the raw materials to be separated is realized.

In a preferred embodiment of the present invention, the adsorption column is preferably filled with an adsorbent. The adsorbent capable of realizing adsorption separation to obtain the target component can be filled correspondingly according to different adsorption separation systems.

In a preferred embodiment of the present invention, the materials flowing in and out of the adsorption column 1 pass through the mixing channel 201 of the multi-channel combination valve 2, and then are communicated with different material flow channels 203 in the multi-channel combination valve 2; and the adsorption and desorption of the adsorption column 1 are realized under the step-by-step control of different control valves in the multi-channel combination valve 2, and the obtained different products are discharged out of the liquid-phase simulated moving bed adsorption separation system. By adopting the liquid phase simulated moving bed adsorption separation system provided by the utility model, the plurality of multi-channel combination valves 2 which are dispersedly arranged realize that controllable material inlet and outlet pipelines are independently provided for each adsorption column 1, a common pipeline is not required to be arranged, a flushing pipeline and a flushing step are correspondingly omitted, and the retention of materials can be greatly reduced in the structural design of the multi-channel combination valves 2.

In a preferred embodiment of the present invention, each of the multi-channel combination valves 2 integrates a plurality of pipelines and corresponding control valves required for performing simulated moving bed adsorptive separation, and is directly disposed between different adsorption columns, so that the occupied space of the control valves and corresponding pipelines is advantageously reduced, and the pipeline structure of the whole system is simplified.

In a specific embodiment of the utility model, the system further comprises an automatic control system, which is used for controlling the material inlet and outlet of the multi-channel combination valves, and realizing the periodic switching of the material inlet and outlet positions in the system, thereby achieving the effect of improving the adsorption separation of the simulated moving bed.

In a particularly preferred embodiment of the present invention, as shown in FIG. 1, a simulated moving bed adsorptive separation system is provided for the separation of mixed xylenes (p-xylene, o-xylene, and m-xylene). Each of the adsorption columns 1 is packed with an adsorbent for adsorbing a target product, such as meta-xylene. Each multi-channel combination valve is connected with and controls four strands of materials, which can be raw materials to be separated (mixed xylene), a desorbent (toluene), extract liquid (mixed liquid of m-xylene and toluene) and raffinate (mixed liquid of o-xylene, m-xylene and toluene).

The liquid phase simulated moving bed adsorptive separation system according to the present invention is shown in FIG. 1, wherein F is the number of 1, 2, 3 … … n multi-channel combination valves in the system₁、F₂、F₃……F_nCorresponding to the material channels leading in the material to be separated on the different multi-channel combination valves, D₁、D₂、D₃……D_nDesorbent channels R for introducing desorbent on different multi-channel combination valves₁、R₂、R₃……R_nRaffinate channels for discharging raffinate from different multi-channel combination valves, E₁、E₂、E₃……E_nThe process of separating meta-xylene by adsorption of the mixed xylene simulated moving bed can be realized by corresponding extract channels for discharging extract on different multi-channel combination valves as follows:

from F of the raw material to be separated₃Injecting into a 3 rd multi-channel combination valve 2, flowing downwards with the circulating liquid to enter a 3 rd adsorption column 1 filled with the adsorbent, adsorbing the m-xylene component in the 3 rd adsorption column 1 by the adsorbent, passing the unadsorbed o-xylene and p-xylene and the original toluene in the circulating liquid through R of a 4 th multi-channel combination valve₄And collected in the raffinate manifold. Simultaneously, the desorbent D is injected into the 1 st multi-channel combination valve 2 through D1, the adsorbent filled in the adsorption column is adsorbed with the meta-xylene adsorbed in the previous cycle period along with the circulating liquid entering the 1 st adsorption column 1, the injection of the desorbent displaces the meta-xylene adsorbed in the adsorbent, and the desorbent E passes through the 2 nd multi-channel combination valve₂The mixed liquid enters an extract main pipe to be collected, and the components in the extract are mixed liquid of meta-xylene and toluene. Due to the difference of boiling points of toluene and m-xyleneThe high-purity m-xylene and toluene are easy to separate by a fractionation method, the m-xylene is collected as a target product, and the toluene is collected and then is recycled as a desorbent. The raffinate was treated in the same manner. In the actual operation of the simulated moving bed, the material flow remained in each adsorption column forms circulating liquid from bottom to top through a circulating pump, and adsorption separation can be carried out repeatedly; four strands of inlet and outlet materials move on the adsorption columns of the system one by one from top to bottom at regular time through different multi-channel combination valves, the positions of the inlet and the outlet of the inlet and outlet materials are continuously switched, and periodic circulation is formed along a plurality of adsorption columns, so that the purpose of continuously collecting extract liquid and raffinate to achieve adsorption separation is achieved, and flushing pipelines are not required to be arranged.

The utility model is provided with more multi-channel combination valves than the adsorption columns, and the volume of the circulation pipeline is equal to the actual material flow volume (the sum of the volume among the adsorbent particles filled in the adsorption column and the pore volume of the adsorbent) of one adsorption column, which can be called as a virtual bed layer. The method can eliminate the lead (or time difference) of material injection or discharge when the mth adsorption column is switched to the 1 st adsorption column in the prior art, so that the adsorption system is more stable in operation and better in separation effect.

Whereas the simulated moving bed in the prior art is shown in fig. 3, and comprises a rotary valve 8, an adsorption tower 9 and a matching pipeline, the adsorption tower 9 comprises a plurality of adsorption beds (i.e. adsorption columns, for example, 24 adsorption beds), and the matching pipeline at least comprises: the material inlet and outlet line group 7 (including 2 feed lines and 2 outlet lines), the flushing line 10, and the material inlet and outlet lines connecting the rotary valve 8 and the adsorption tower 9 (namely, a plurality of first conveying lines 801 and second conveying lines 802, the number of the first conveying lines 801 and the second conveying lines 802 corresponds to that of the adsorption beds respectively), the material inlet and outlet between the rotary valve 8 and the adsorption tower 9 are realized through the material inlet and outlet lines, and four material inlet and outlet lines (for example, there are 2 feed lines and 2 discharge lines at the same time) are provided at the same time, so that the details are not repeated herein for the prior art. In the prior art, a plurality of common pipelines, such as the first conveying line 801 and the second conveying line 802, are arranged, when different materials are replaced, the common pipelines need to be flushed through the flushing pipeline 10, the process is complex, and the overall energy consumption of the device is increased. Furthermore, dead corners (e.g., pipe corners) that are not easily flushed are often present in utility lines.

The simulated moving bed system provided by the utility model comprises the multi-channel combined valve with the specific structure, so that dead corners which are not easy to wash do not exist, and materials can directly enter the corresponding adsorption columns through the mixing flow channel. In addition, the multi-channel combination valve is provided with control pipelines for communicating different material flows, the adsorption columns are dispersedly communicated, the material inlet and outlet are provided for each adsorption column, and each strand of material uses a special distribution pipe, so that the defect that the material needs to be washed when being switched due to the arrangement of a common pipeline on an industrial device in the prior art is overcome, the common pipeline does not need to be arranged in the simulation moving bed system, the washing step of the common pipeline is omitted, the structure of the system is saved, and the complexity of operation is reduced. The relation between the number of the multi-channel combination valves arranged in the system and the number of the adsorption columns can provide a virtual bed layer in cooperation with a circulation pipeline and a circulation pump, and the time difference existing in the circulation switching of the system and the normal operation of the adsorption columns is eliminated in cooperation with an automatic control system, so that the more stable operation and the better separation effect are provided.

The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the utility model, many simple modifications can be made to the technical solution of the utility model, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the utility model, and all fall within the scope of the utility model.

Claims

1. A liquid phase simulated moving bed adsorptive separation system, comprising: the device comprises m adsorption columns, n multi-channel combination valves, a circulating pump, a multi-channel material flow pipeline communicated with the multi-channel combination valves, and a circulating pipeline communicated with the circulating pump and the multi-channel combination valves;

2. The system of claim 1, wherein the multichannel combination valve comprises: a valve body and a plurality of control valves disposed in the valve body; wherein,

the valve body is provided with a mixing flow passage penetrating through the valve body and used for communicating the adsorption column; the valve core channel is vertically communicated with the mixing flow channel and penetrates through the outer wall of the valve body; and a material flow channel penetrating to the outer wall of the valve body is arranged on the side wall of each valve core channel.

3. The system of claim 2, wherein a plurality of the poppet passages are disposed circumferentially of the mixing channel;

and/or a plurality of the valve core channels are arranged on the same or different horizontal planes along the central axis of the mixing flow channel;

and/or 1 control valve is arranged in each valve core channel.

4. A system according to claim 2 or 3, wherein the flow channel communicates with the flow line for introducing or discharging different materials into or out of the mixing channel;

and/or the control valve is used for controlling the material flow in the material flow channel.

5. A system according to claim 2 or 3, wherein the flow channel is arranged perpendicular to the spool channel.

6. The system of claim 2 or 3, wherein the valve body comprises: 4 valve core channels, 4 control valves and 4 material flow channels are correspondingly arranged;

and/or, 4 of said logistics channels comprise: a raw material channel for introducing a raw material to be separated into the mixed flow channel, a desorbent channel for introducing a desorbent into the mixed flow channel, a raffinate channel for discharging raffinate from the mixed flow channel, and an extract channel for discharging extract from the mixed flow channel;

and/or 4 valve core channels are arranged on different horizontal planes along the circumferential direction of the mixing flow channel and are mutually vertical.

7. The system of claim 6, wherein the feed channels of different ones of the multichannel combination valves are in parallel communication, the desorbent channels of different ones of the multichannel combination valves are in parallel communication, the raffinate channels of different ones of the multichannel combination valves are in parallel communication, and the extract channels of different ones of the multichannel combination valves are in parallel communication via a plurality of the stream lines.

8. The system as claimed in claim 2 or 3, wherein the circulation pump is connected with the 1 st multi-channel combination valve and the nth multi-channel combination valve through the circulation pipeline, and is used for circularly introducing the material discharged from the mixing flow channel of the nth multi-channel combination valve into the mixing flow channel of the 1 st multi-channel combination valve as a circulation liquid.

9. The system of claim 1, wherein the system is divided into a plurality of functional zones in a direction from a 1 st said multi-channel combination valve to an nth said multi-channel combination valve; each functional area comprises at least one adsorption column and the multi-channel combination valve.

10. The system of claim 1, wherein the adsorption column is packed with an adsorbent.