EFFICIENT SIMULATED MOVING BED DEVICE AND EFFICIENT SIMULATED MOVING BED PROCESS

Abstract

An efficient simulated moving bed device and an efficient simulated moving bed process are provided. The efficient simulated moving bed device comprises an adsorption bed, a raw material feeding system, a desorbent feeding system, a circulating system, an extract system, a raffinate system, a program-controlled valve group, and an automatic control system.

Claims

1. An efficient simulated moving bed device, comprising an adsorption bed, a raw material feeding system, a desorbent feeding system, a circulating system, an extract system, a raffinate system, a program-controlled valve group, and an automatic control system, wherein the adsorption bed comprises a plurality of adsorption columns divided into an adsorption zone, a purification zone and a desorption zone; wherein each adsorption column of the plurality of adsorption columns has an upper end provided with a raw material feeding valve, a desorbent feeding valve and a circulation fluid feeding valve, and a lower end provided with a raffinate discharge valve and an extract discharge valve; wherein a check valve is provided between two adjacent adsorption column; wherein raw material feeding system is connected to the raw material feeding valve of each adsorption column; wherein the circulating system comprises a circulating pump connected to the circulation fluid feeding valve of each adsorption column; wherein the extract system is connected to the extract discharge valve of each adsorption column; wherein the raffinate system is connected to the raffinate discharge valve of each adsorption column; and wherein all the valves form the program-controlled valve group, the program-controlled valve group is connected to the automatic control system, and the automatic control system is configured to control an opening state and a closing state of each valve in the program-controlled valve group.

2. The efficient simulated moving bed device of claim 1, wherein the adsorption bed comprises 3 to 100 adsorption columns.

3. The efficient simulated moving bed device of claim 1, wherein the adsorption bed comprises 8*N adsorption columns, and wherein N is an integer greater than or equal to 1.

4. The efficient simulated moving bed device of claim 1, wherein the raw material feeding system comprises a raw material pump and a raw material heater located downstream of the raw material pump, and the raw material heater comprises an outlet pipeline connected to the adsorption column.

5. The efficient simulated moving bed device of claim 1, wherein the desorbent feeding system comprises a desorbent pump and a desorbent heater located downstream of the desorbent pump, and the desorbent heater comprises an outlet pipeline connected to the adsorption column.

6. The efficient simulated moving bed device of claim 1, wherein the extract system comprises an extract pump connected to an extract pipeline of the adsorption bed.

7. The efficient simulated moving bed device of claim 6, wherein a cooler is provided on the extract pipeline.

8. The efficient simulated moving bed device of claim 1, wherein the raffinate system comprises a raffinate pump or a back pressure valve, and the raffinate pump or the back pressure valve is connected to a raffinate pipeline of the adsorption bed.

9. The efficient simulated moving bed device of claim 8, wherein a cooler is provided on the raffinate pipeline.

10. The efficient simulated moving bed device of claim 1, wherein the circulating pump of the circulating system comprises a feeding port connected to an extract pipeline of the adsorption bed.

11. The efficient simulated moving bed device of claim 1, wherein a heater and/or a flow meter are/is provided downstream of the circulating pump of the circulating system.

12. The efficient simulated moving bed device of claim 1, wherein each of the valves in the program-controlled valve group is independently selected as one of a ball valve, a needle valve, a stop valve and a butterfly valve; and wherein each of the valves comprises a pneumatic actuator or an electric actuator.

13. The efficient simulated moving bed device of claim 1, wherein a relative position of the circulating pump in an area is constant.

14. The efficient simulated moving bed device of claim 1, wherein each connecting pipeline between the adsorption columns has a same volume.

15. The efficient simulated moving bed device of claim 1, wherein each pipeline of each adsorption column connected to the circulating pump has a same volume.

16. The efficient simulated moving bed device of claim 1, wherein the adsorption zone further comprises a buffer zone.

17. An efficient simulated moving bed process implemented by the efficient simulated moving bed device of claim 1, comprising: controlling valves to switch to change each feeding position and each discharging position, so as to perform a simulated movement of an adsorption zone, a purification zone and a desorption zone.

18. An efficient simulated moving bed process implemented by the efficient simulated moving bed device of claim 16, comprising: controlling valves to switch to change each feeding position and each discharging position, so as to perform a simulated movement of an adsorption zone, a purification zone, a desorption zone and a buffer zone.

19. The efficient simulated moving bed device of claim 2, wherein the adsorption bed comprises 8*N adsorption columns, and wherein N is an integer greater than or equal to 1.

20. The efficient simulated moving bed device of claim 2, wherein the raw material feeding system comprises a raw material pump and a raw material heater located downstream of the raw material pump, and the raw material heater comprises an outlet pipeline connected to the adsorption column.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG. 1 shows a schematic diagram of a simulated moving bed device with a multi-channel rotary valve in the related art.

[0030] FIG. 2 shows a schematic diagram of an efficient simulated moving bed device of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

[0031] FIG. 1 shows a schematic diagram of a simulated moving bed device with a multi-channel rotary valve in the related art. In the simulated moving bed, a fixed adsorption bed is divided into a plurality of sections filled with adsorbents. With a rotation of the multi-channel rotary valve, a periodic switching of a process is realized. Positions of material inlets and outlets at a certain moment divide the entire adsorption bed into four zones. By using the multi-channel rotary valve, the simulated moving bed enables the four material inlets and outlets to move upward at a speed synchronized with a change of a solid phase concentration. In this way, a closed loop is formed. An overall result of the closed loop is substantially the same as an effect produced by keeping the positions of the inlets and outlets in place while moving the solid adsorbent from top to bottom in an adsorber, so as to achieve the separation of component A and component B. A core device of this process is the multi-channel rotary valve, so as to achieve the purpose of separating products. The simulated moving bed with the multi-channel rotary valve in the related art has technical problems such as high cost, difficult maintenance, poor long-term operation capability and difficult control, which affect the separation effect of the simulated moving bed.

[0032] In order to solve the above technical problems, the present disclosure provides a new efficient simulated moving bed device. The technical solution of the present disclosure will be described in detail below in conjunction with specific embodiments and drawings.

[0033] Referring to FIG. 2, an adsorption bed including 8 adsorption columns is illustrated by way of example.

[0034] The efficient simulated moving bed device includes an adsorption bed, a raw material feeding system, a desorbent feeding system, a circulating system, an extract system, a raffinate system, a program-controlled valve group, and an automatic control system. Adsorption columns of the adsorption bed are divided into an adsorption zone, a purification zone, a desorption zone and a buffer zone (it should be noted that the adsorption bed including the adsorption zone, the purification zone, the desorption zone and the buffer zone is used in this embodiment, but the buffer zone is not necessary for the present disclosure and is optional).

[0035] Upper ends of the adsorption columns 1 to 8 are respectively provided with raw material feeding valves A3, B3, C3, D3, E3, F3, G3, H3, desorbent feeding valves A2, B2, C2, D2, E2, F2, G2, H2, and circulation fluid feeding valves A4, B4, C4, D4, E4, F4, G4, H4. Lower ends of the adsorption columns 1 to 8 are respectively provided with raffinate discharge valves A5, B5, C5, D5, E5, F5, G5, H5, and extract discharge valves A6, B6, C6, D6, E6, F6, G6, H6. Check valves A1, B1, C1, D1, E1, F1, G1, H1 are provided between two adjacent adsorption columns. The raw material feeding system is connected to the raw material feeding valves A3, B3, C3, D3, E3, F3, G3, H3 of the adsorption columns. The desorbent feeding system is connected to the desorbent feeding valves A2, B2, C2, D2, E2, F2, G2, H2 of the adsorption columns. The circulating system includes a circulating pump, and the circulating liquid feeding system is connected to the circulation liquid feeding valves A4, B4, C4, D4, E4, F4, G4, H4 of the adsorption columns through the circulating pump. The extract system is connected to the extract discharge valves A6, B6, C6, D6, E6, F6, G6, H6 of the adsorption columns. The raffinate system is connected to the raffinate discharge valves A5, B5, C5, D5, E5, F5, G5, H5 of the adsorption columns.

[0036] In this embodiment, a relative position of the circulating pump in an area remains unchanged, and thus a flow rate of the circulating pump remains unchanged. Each of the connecting pipelines between the adsorption columns has a same volume, and each of the pipelines of the adsorption columns connected to the circulating pump has a same volume. Therefore, the flow rate of the circulating pump of this embodiment is unchanged, the pressure fluctuation is small, and the control is simple.

[0037] In this embodiment, all the valves form the program-controlled valve group, the program-controlled valve group is connected to the automatic control system, and the automatic control system may control an opening and closing states of each valve in the program-controlled valve group.

[0038] As an improvement of this embodiment, optionally, the raw material feeding system includes a raw material pump and a raw material heater located downstream of the raw material pump, and the raw material heater includes an outlet pipeline connected to the adsorption column. The raw material pump may provide a feed power to feed the raw material, and the raw material heater may heat the raw material to an appropriate temperature, so as to improve the adsorption activity. Specific pumping pressure and heating temperature are determined according to characteristics of a material separation system.

[0039] As an improvement of this embodiment, optionally, the desorbent feeding system includes a desorbent pump and a desorbent heater located downstream of the desorbent pump, and the desorbent heater includes an outlet pipeline connected to the adsorption column. The desorbent pump may provide a feed power to feed the desorbent, and the desorbent heater may heat the desorbent to an appropriate temperature, so as to improve the desorbent activity. Specific pumping pressure and heating temperature are determined according to characteristics of a material separation system.

[0040] As an improvement of this embodiment, optionally, the extract system includes an extract pump connected to an extract pipeline of the adsorption bed. The extract pump may provide an extraction power for the extract.

[0041] As an improvement of this embodiment, optionally, the raffinate system includes a raffinate pump or a back pressure valve connected to a raffinate pipeline of the adsorption bed. The raffinate pump may provide an extraction power for the raffinate.

[0042] As an improvement of this embodiment, optionally, the circulating pump of the circulating system includes a feed port connected to the extract pipeline of the adsorption bed, so as to circulate the extract.

[0043] As an improvement of this embodiment, optionally, each of the valves in the program-controlled valve group is independently selected as one of a ball valve, a needle valve, a stop valve, and a butterfly valve. That is, the 56 valves in this embodiment are independently one of a ball valve, a needle valve, a stop valve, and a butterfly valve, without interfering each other. The valve includes a pneumatic actuator or an electric actuator.

[0044] As an improvement of this embodiment, optionally, a relative position of the circulating pump in an area remains unchanged, and therefore a flow rate of the circulating pump remains unchanged. Each of the connecting pipelines between the adsorption columns has a same volume, and each of the pipelines of the adsorption columns connected to the circulating pump has a same volume. Therefore, a flow rate of the circulating pump of this embodiment is unchanged, the pressure fluctuation is small, and the control is simple.

[0045] There is provided an efficient simulated moving bed process using the efficient simulated moving bed device with 8 adsorption columns described in the above embodiment, in which valves are controlled to switch, so as to change each feeding position and each discharging position, so that a simulated movement of an adsorption zone, a purification zone, a desorption zone, and buffer zone is realized. The efficient simulated moving bed process includes the following steps.

[0046] In 0-t stage, the check valve A1 and the desorbent feeding valve A2 of the adsorption column 1, the desorbent feeding valve B2 and the extract discharge valve B6 of the adsorption column 2, the circulation fluid feeding valve C4 of the adsorption column 3, the check valve D1 of the adsorption column 4, the check valve E1 and the raw material feeding valve E3 of the adsorption column 5, the check valve F1 and the raffinate discharge valve F5 of the adsorption column 6, the check valve G1 of the adsorption column 7, and the check valve H1 of the adsorption column 8 are opened, and the other valves are closed.

[0047] At this time, the adsorption zone includes the adsorption column 5 and the adsorption column 6, the raw material enters the adsorption column 5 and the adsorption column 6, a target product component is absorbed, and a non-target component flows out from the outlet.

[0048] The purification zone includes the adsorption column 3 and the adsorption column 4, and the circulating pump drives a circulation liquid into the adsorption column 3 and the adsorption column 4 to purify the target product component adsorbed in a previous period.

[0049] The desorption zone includes the adsorption column 1 and the adsorption column 2, the desorbent pump drives a desorbent and a part of a desorbent from the buffer to enter the adsorption column 1 and the adsorption column 2, and the target product component purified in a previous period is eluted and extracted from the system, thereby achieving the adsorption and separation.

[0050] The buffer zone includes the adsorption column 7 and the adsorption column 8, most of the target product component in the raw material is adsorbed in the adsorption zone, and a remaining mixture containing a large amount of non-target component and a small amount of target component enters the buffer zone and waits for a next period.

[0051] The valves are controlled to switch to change positions of feeding and discharging materials in t-2t, 2t-3t and 3t-4t stages, thereby realizing the simulated movement of the adsorption zone, the purification zone, the desorption zone and the buffer zone.

[0052] Valve controls in 0-1t, t-2t, 2t-3t, 3t-4t stages are shown in Table 1 to Table 4.

TABLE-US-00001 TABLE 1 Valve control in 0-1t stage 0-t Column 1 A1 A2 A3 A4 A5 A6 State ✓ ✓ x x x x Column 2 B1 B2 B3 B4 B5 B6 State x ✓ x x x ✓ Column 3 C1 C2 C3 C4 C5 C6 State x x x ✓ x x Column 4 D1 D2 D3 D4 D5 D6 State ✓ x x x x x Column 5 E1 E2 E3 E4 E5 E6 State ✓ x ✓ x x x Column 6 F1 F2 F3 F4 F5 F6 State ✓ x x x ✓ x Column 7 G1 G2 G3 G4 G5 G6 State ✓ x x x x x Column 8 H1 H2 H3 H4 H5 H6 State ✓ x x x x x Valve opened ✓ Valve closedx

TABLE-US-00002 TABLE 2 Valve control in t-2t stage t-2t Column 1 A1 A2 A3 A4 A5 A6 State ✓ x x x x x Column 2 B1 B2 B3 B4 B5 B6 State ✓ ✓ x x x x Column 3 C1 C2 C3 C4 C5 C6 State x x x x x ✓ Column 4 D1 D2 D3 D4 D5 D6 State x x x ✓ x x Column 5 E1 E2 E3 E4 E5 E6 State ✓ x x x x x Column 6 F1 F2 F3 F4 F5 F6 State ✓ x ✓ x x x Column 7 G1 G2 G3 G4 G5 G6 State ✓ x x x ✓ x Column 8 H1 H2 H3 H4 H5 H6 State ✓ x x x x x valve opened ✓ valve closedx

TABLE-US-00003 TABLE 3 Valve control in 2t-3t stage 2t-3t Column 1 A1 A2 A3 A4 A5 A6 State ✓ x x x x x Column 2 B1 B2 B3 B4 B5 B6 State ✓ x x x x x Column 3 C1 C2 C3 C4 C5 C6 State ✓ ✓ x x x x Column 4 D1 D2 D3 D4 D5 D6 State ✓ x x x x ✓ Column 5 E1 E2 E3 E4 E5 E6 State x x x ✓ x x Column 6 F1 F2 F3 F4 F5 F6 State ✓ x x x x x Column 7 G1 G2 G3 G4 G5 G6 State ✓ x ✓ x x x Column 8 H1 H2 H3 H4 H5 H6 State ✓ x x x ✓ x valve opened ✓ valve closedx

TABLE-US-00004 TABLE 4 Valve control in 3t-4t stage 3t-4t Column 1 A1 A2 A3 A4 A5 A6 State ✓ x x x ✓ x Column 2 B1 B2 B3 B4 B5 B6 State ✓ x x x x x Column 3 C1 C2 C3 C4 C5 C6 State ✓ x x x x x Column 4 D1 D2 D3 D4 D5 D6 State ✓ ✓ x x x x Column 5 E1 E2 E3 E4 E5 E6 State ✓ x x x x ✓ Column 6 F1 F2 F3 F4 F5 F6 State x x x ✓ x x Column 7 G1 G2 G3 G4 G5 G6 State ✓ x x x x x Column 8 H1 H2 H3 H4 H5 H6 State ✓ x ✓ x x x valve opened ✓ valve closedx