An apparatus for continuous distillation of disperse dye mother liquor to recover methanol and DMAC

Abstract

This utility model relates to the field of extraction equipment technology, and in particular to a device for continuous distillation of disperse dye mother liquor to recover methanol and DMAC. The device includes a methanol extraction unit, a DMAC extraction unit, a condenser, and a methanol storage tank. The methanol extraction unit has an inlet pipe, an outlet pipe, and a vaporized methanol flow pipe. The output end of the vaporized methanol flow pipe is connected to the shell-side inlet end of the condenser. A liquefied methanol flow pipe is installed on the shell-side outlet end of the condenser, and its output end is connected to the methanol storage tank. A first reflux pipe is installed in the middle section of the liquefied methanol flow pipe and is connected to the inlet pipe. The methanol storage tank has a second reflux pipe, the output end of which is connected to the first reflux pipe. The output end of the outlet pipe is connected to the DMAC extraction unit. Through the cyclic extraction and purification loop of the methanol extraction unit, condenser, and methanol storage tank, the methanol recovery rate and purity are improved.

Description

Technical Field

[0001] This utility model relates to the field of extraction equipment technology, and in particular to a device for continuous distillation of disperse dye mother liquor to recover methanol and DMAC. Background Technology

[0002] The mother liquor for disperse dye production contains methanol, DMAC, and high-viscosity dye residue. Methanol and DMAC have large differences in boiling points, and traditional single-tower separation requires multiple cycles, resulting in high energy consumption and low separation and extraction efficiency. Dye residue in the mother liquor cokes on the heating wall, leading to a decrease in heat transfer efficiency and requiring frequent shutdowns for cleaning. Fluctuations in the reflux ratio during intermittent operation cause unstable solvent purity, making it impossible to reuse directly. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the problems of high energy consumption and low separation and extraction efficiency in the single-tower separation of the prior art; and the problem that the dye residue in the mother liquor cokes on the heating wall, resulting in a decrease in heat transfer efficiency and the need for frequent shutdown and cleaning, a device for continuous distillation and recovery of methanol and DMAC from disperse dye mother liquor is provided.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a device for continuous distillation and recovery of methanol and DMAC from disperse dye mother liquor, comprising a methanol extraction device, a DMAC extraction device, a condenser, and a methanol storage tank. The methanol extraction device is used to extract methanol, the DMAC extraction device is used to extract DMAC, the condenser is used to condense the methanol vaporized by the methanol extraction device, and the methanol storage tank is used to store liquefied methanol. The methanol extraction device has an inlet pipe, an outlet pipe, and a vaporized methanol flow pipe, the output end of which is connected to the shell-side inlet end of the condenser. A liquefied methanol flow pipe is installed on the shell-side output end of the condenser. The output end of the liquefied methanol flow pipe is connected to the methanol storage tank. A first reflux pipe is installed in the middle section of the liquefied methanol flow pipe. The first reflux pipe is connected to the feed pipe. The methanol storage tank has a second reflux pipe. The output end of the second reflux pipe is connected to the first reflux pipe. The output end of the discharge pipe is connected to the DMAC extraction device. Through the cyclic extraction and purification loop of the methanol extraction device, condenser and methanol storage tank components, the problem of low separation efficiency caused by the mixing of vaporized components and liquid is solved, and the methanol recovery rate and recovery purity are improved.

[0005] The methanol extraction device further includes a shell, an insulation sleeve, a motor, a rotating rod, a dispersing disc, and a scraper. The insulation sleeve is fitted over the outside of the shell, and the insulation sleeve and the shell together form a heating chamber for the flow of the heating medium. The motor is fixedly connected to the shell, and the output end of the motor is drivenly connected to the rotating rod. The bottom end of the rotating rod extends into the shell. The dispersing disc and the scraper are located inside the shell. Both the dispersing disc and the scraper are fixedly installed on the rotating rod, and the dispersing disc is located above the scraper. The inlet port of the liquefied methanol flow pipe and the inlet port of the feed pipe are located above the dispersing disc.

[0006] To address the issue of easy breakage at the connection between the scraper and the rotating rod, a further improvement is made, which involves fixing the scraper to the rotating rod via a connecting rod.

[0007] To address the problem of uneven raw material distribution leading to low extraction rates, the methanol extraction device further includes a primary flow guiding mechanism and a secondary flow guiding mechanism arranged sequentially from top to bottom. The primary and secondary flow guiding mechanisms are mounted on a connecting rod, and the scraper has primary flow guiding holes connected to the primary flow guiding mechanism and secondary flow guiding holes connected to the secondary flow guiding mechanism.

[0008] To address the issue of low flow guiding efficiency, a primary flow guiding mechanism is further included, comprising a primary flow guiding shroud and a primary fixing rod. The top surface of the primary flow guiding shroud has a primary through hole, and the primary flow guiding shroud expands outward from top to bottom. The primary flow guiding shroud is fixedly connected by a primary fixing rod and a connecting rod.

[0009] To address the issue of low flow guiding efficiency, a secondary flow guiding mechanism is further included, comprising a secondary flow guiding shroud and a secondary fixing rod. The top surface of the secondary flow guiding shroud has a secondary through hole, and the secondary flow guiding shroud expands outward from top to bottom. The secondary flow guiding shroud is fixedly connected by a secondary fixing rod and a connecting rod.

[0010] To address the problems caused by the single-layer flow guiding mechanism, a further improvement is made, where the diameter of the secondary through-hole is smaller than that of the primary through-hole.

[0011] The beneficial effects of this utility model are as follows: This utility model provides a device for continuous distillation and recovery of methanol and DMAC from disperse dye mother liquor. Through the cyclic extraction and purification loop of methanol extraction device, condenser and methanol storage tank components, it solves the problem of low separation efficiency caused by mixing of vaporized components with liquid, and improves methanol recovery rate and recovery purity. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a cross-sectional structural schematic diagram of the methanol extraction device of this utility model.

[0015] In the diagram: 1. Methanol extraction device; 11. Shell; 12. Insulation sleeve; 121. Heating chamber; 13. Motor; 14. Rotating rod; 15. Dispersion disc; 16. Scraper; 161. Primary guide hole; 162. Secondary guide hole; 17. Connecting rod; 18. Primary guide mechanism; 181. Primary guide hood; 1811. Primary through hole; 182. Primary fixing rod; 19. Secondary guide mechanism; 191. Secondary guide hood; 1911. Secondary through hole; 192. Secondary fixing rod; 2. DMAC extraction device; 3. Condenser; 4. Methanol storage tank; 5. Feed pipe; 6. Discharge pipe; 7. Vaporized methanol flow pipe; 8. Liquefied methanol flow pipe; 9. First reflux pipe; 10. Second reflux pipe. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0017] like Figure 1 This is a schematic diagram of the structure of this utility model. It describes an apparatus for the continuous distillation and recovery of methanol and DMAC from disperse dye mother liquor. The apparatus includes a methanol extraction device 1, a DMAC extraction device 2, a condenser 3, and a methanol storage tank 4. The methanol extraction device 1 is used to extract methanol, the DMAC extraction device 2 is used to extract DMAC, the condenser 3 is used to condense the methanol vaporized by the methanol extraction device 1, and the methanol storage tank 4 is used to store liquefied methanol. The methanol extraction device 1 has an inlet pipe 5, an outlet pipe 6, and a vaporized methanol flow pipe 7. The output end of the vaporized methanol flow pipe 7 is connected to the shell-side inlet end of the condenser 3. A liquefied methanol flow pipe 8 is installed on the shell-side outlet end of the condenser 3, and its output end is connected to the methanol storage tank 4. A first reflux pipe 9 is installed in the middle section of the liquefied methanol flow pipe 8, and it is connected to the inlet pipe 5. The methanol storage tank 4 has a second reflux pipe 10, the output end of which is connected to the first reflux pipe 9. The output end of the outlet pipe 6 is connected to the DMAC extraction device 2.

[0018] like Figure 2As shown, the methanol extraction device 1 includes a housing 11, an insulation sleeve 12, a motor 13, a rotating rod 14, a dispersing disc 15, and a scraper 16. The insulation sleeve 12 is fitted over the outside of the housing 11, and the insulation sleeve 12 and the housing 11 enclose a heating chamber 121 for the flow of the heating medium. The motor 13 is fixedly connected to the housing 11, and the output end of the motor 13 is connected to the rotating rod 14. The bottom end of the rotating rod 14 extends into the housing 11. The dispersing disc 15 and the scraper 16 are located inside the housing 11. Both the dispersing disc 15 and the scraper 16 are fixedly installed on the rotating rod 14, and the dispersing disc 15 is located above the scraper 16. The input port of the liquefied methanol flow pipe 8 and the input port of the feed pipe 5 are located above the dispersing disc 15.

[0019] like Figure 2 As shown, the scraper 16 is fixedly connected to the connecting rod 17 and the rotating rod 14. The connecting rod 17 buffers the torque and improves the equipment life. The methanol extraction device 1 includes a primary flow guiding mechanism 18 and a secondary flow guiding mechanism 19 arranged sequentially from top to bottom. The primary flow guiding mechanism 18 and the secondary flow guiding mechanism 19 are installed on the connecting rod 17. The scraper 16 is provided with a primary flow guiding hole 161 connected to the primary flow guiding mechanism 18 and a secondary flow guiding hole 162 connected to the secondary flow guiding mechanism 19. The primary flow guiding hole 161 and the secondary flow guiding hole 162 will spray the splashed liquid into different layers between the inner sides of the scraper 16 and the center of the housing 11.

[0020] like Figure 2 As shown, the primary flow guiding mechanism 18 includes a primary flow guiding cover 181 and a primary fixing rod 182. The top surface of the primary flow guiding cover 181 has a primary through hole 1811. The primary flow guiding cover 181 expands outward from top to bottom. The primary flow guiding cover 181 is fixedly connected to the primary fixing rod 182 and the connecting rod 17.

[0021] like Figure 2 As shown, the secondary flow guiding mechanism 19 includes a secondary flow guiding shroud 191 and a secondary fixing rod 192. The top surface of the secondary flow guiding shroud 191 has a secondary through hole 1911. The secondary flow guiding shroud 191 expands outward from top to bottom. The secondary flow guiding shroud 191 is fixedly connected to the secondary fixing rod 192 and the connecting rod 17.

[0022] like Figure 2 As shown, the diameter of the secondary through hole 1911 is smaller than that of the primary through hole 1811, so that the primary guide shroud 181 and the secondary guide shroud 191 can collect the sputtered liquid at different levels in the center of the spaced shell 11 in a layered manner, avoiding the accumulation of a large amount of collected liquid that would reduce the evaporation efficiency.

[0023] Heating medium is introduced into heating chamber 121, and the temperature of shell 11 rises to the methanol vaporization temperature. Mother liquor enters methanol extraction device 1 through feed pipe 5 and is sprayed onto rotating dispersion disk 15. Dispersion disk 15 centrifuges and atomizes mother liquor, increasing vaporization surface area. Primary flow guide 181 and secondary flow guide 191 collect the splashed liquid and redirect it to between scraper 16 and shell 11. Unvaporized droplets are scraped by scraper 16 to renew the liquid film, and residue accumulates at the bottom of the tower.

[0024] The vaporized methanol is liquefied in the shell side of condenser 3. Part of it is returned to feed pipe 5 through first reflux pipe 9 to adjust the concentration. The remaining methanol is stored in storage tank 4. Excess methanol in the tank is refluxed back through second reflux pipe 10.

[0025] The methanol bottom liquid enters the DMAC extraction unit 2, where it is vaporized by DMAC and collected and condensed through the secondary guide hole 162 via the secondary guide shroud 191.

[0026] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A device for continuous rectification recovery of methanol and DMAC from a disperse dye mother liquor, characterized in that, The system includes a methanol extraction device (1), a DMAC extraction device (2), a condenser (3), and a methanol storage tank (4). The methanol extraction device (1) is used to extract methanol, the DMAC extraction device (2) is used to extract DMAC, the condenser (3) is used to condense the methanol vaporized by the methanol extraction device (1), and the methanol storage tank (4) is used to store liquefied methanol. The methanol extraction device (1) has an inlet pipe (5), an outlet pipe (6), and a vaporized methanol flow pipe (7). The outlet end of the vaporized methanol flow pipe (7) and the condenser (3) are connected to the condenser (4). The condenser (3) has a shell-side input end connected to the condenser (3), and a liquefied methanol flow pipe (8) is installed on the shell-side output end of the condenser (3). The output end of the liquefied methanol flow pipe (8) is connected to the methanol storage tank (4). A first reflux pipe (9) is installed on the middle section of the liquefied methanol flow pipe (8). The first reflux pipe (9) is connected to the feed pipe (5). The methanol storage tank (4) has a second reflux pipe (10). The output end of the second reflux pipe (10) is connected to the first reflux pipe (9). The output end of the discharge pipe (6) is connected to the DMAC extraction device (2).

2. The apparatus for continuous rectification of methanol and DMAC from a dispersion dye liquor according to claim 1, characterized in that: The methanol extraction device (1) includes a shell (11), a heat insulation sleeve (12), a motor (13), a rotating rod (14), a dispersing disc (15), and a scraper (16). The heat insulation sleeve (12) is fitted on the outside of the shell (11). The heat insulation sleeve (12) and the shell (11) enclose a heating chamber (121) for the flow of heating medium. The motor (13) is fixedly connected to the shell (11). The output end of the motor (13) is connected to the rotating rod (14). The bottom end of the rotating rod (14) extends into the shell (11). The dispersing disc (15) and the scraper (16) are located inside the shell (11). The dispersing disc (15) and the scraper (16) are both fixedly installed on the rotating rod (14), and the dispersing disc (15) is located above the scraper (16). The input port of the liquefied methanol flow pipe (8) and the input port of the feed pipe (5) are located above the dispersing disc (15).

3. The apparatus for continuous rectification of methanol and DMAC from a dispersion dye liquor according to claim 2, characterized in that: The scraper (16) is fixedly connected by a connecting rod (17) and a rotating rod (14).

4. The apparatus for continuous rectification of methanol and DMAC from a dispersion dye liquor according to claim 3, characterized in that: The methanol extraction device (1) includes a primary flow guiding mechanism (18) and a secondary flow guiding mechanism (19) arranged sequentially from top to bottom. The primary flow guiding mechanism (18) and the secondary flow guiding mechanism (19) are mounted on a connecting rod (17). The scraper (16) has a primary flow guiding hole (161) connected to the primary flow guiding mechanism (18) and a secondary flow guiding hole (162) connected to the secondary flow guiding mechanism (19).

5. The apparatus for continuous rectification of methanol and DMAC from a dispersion dye liquor according to claim 4, characterized in that: The primary flow guiding mechanism (18) includes a primary flow guiding cover (181) and a primary fixing rod (182). The top surface of the primary flow guiding cover (181) has a primary through hole (1811). The primary flow guiding cover (181) expands outward from top to bottom. The primary flow guiding cover (181) is fixedly connected by the primary fixing rod (182) and the connecting rod (17).

6. The apparatus for continuous distillation of disperse dye mother liquor to recover methanol and DMAC as described in claim 5, characterized in that: The secondary flow guiding mechanism (19) includes a secondary flow guiding shroud (191) and a secondary fixing rod (192). The top surface of the secondary flow guiding shroud (191) has a secondary through hole (1911). The secondary flow guiding shroud (191) expands outward from top to bottom. The secondary flow guiding shroud (191) is fixedly connected by the secondary fixing rod (192) and the connecting rod (17).

7. A device for continuous rectification of methanol and DMAC from a dispersion dye liquor according to claim 6, characterized in that: The diameter of the secondary through hole (1911) is smaller than that of the primary through hole (1811).

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