Synthesis gas separation and purification device for dimethyl ether processing

Abstract

The utility model belongs to the technical field of dimethyl ether extraction, and particularly discloses a synthesis gas separation and purification device for dimethyl ether processing, which is used for solving the technical problems that foams generated in a rectification process have a non-directional gathering effect, and normal separation of gas and liquid phases can be influenced if a large amount of foams are gathered and adhered to the inner wall. Comprising a tower body, a bottom cover and a top cover are mounted at the bottom and the top of the tower body respectively, a plurality of baffles with through holes in the middles are mounted in the tower body at intervals, and a sieve plate is arranged between the through holes of the adjacent baffles; therefore, the defoaming assembly and the driving assembly are combined, most of foams generated by gas-liquid two phases in the dimethyl ether preparation process are eliminated, a large amount of wall-mounted foams are comprehensively eliminated, the feeding direction of synthesis gas can be changed, the reaction efficiency is improved, the foams can be eliminated from beginning to end by utilizing the double-arranged silk screen frames, and the production efficiency is improved. Foams generated in the rectification process are comprehensively eliminated, and the dimethyl ether preparation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dimethyl ether extraction, in particular to a synthetic gas separation and purification device for dimethyl ether processing. Background Art

[0002] Synthesis gas produces ethanol through the dimethyl ether method: the synthesis gas first undergoes gas separation, and the CO and hydrogen in the synthesis gas are separated and purified to obtain CO with a purity of more than 98.825% and hydrogen with a purity of more than 99.9%; methanol is dehydrated and separated to obtain dimethyl ether, which is then gasified and mixed with CO to enter the carbonylation reactor, and then undergoes a carbonylation reaction to generate methyl acetate. After separation, methyl acetate reacts with hydrogen in a hydrogenation reactor to obtain ethanol and methanol. After separation, ethanol is sold as a product, and methanol is returned to the dimethyl ether synthesis unit for use as a raw material; the traditional methanol gas phase dehydration process for producing dimethyl ether adopts a new reaction-separation integrated process, which does not require the reaction gas to be completely condensed before being sent to a distillation tower for separation. Instead, the reaction gas is directly sent to a distillation tower for separation after heat recovery through heat exchange;

[0003] In the distillation tower, foam is generated during the separation process. Foam is formed by the accumulation of bubbles on the interface between gas and liquid in the distillation tower. It is a product of excessive gas velocity or excessive liquid level. It will destroy the equilibrium state of gas-liquid separation in the tower and affect the distillation efficiency. Referring to a foam removal distillation tower disclosed in patent number CN204973117U, foam removal is achieved by setting a double-layer wire mesh baffle in the distillation tower. The foam generated in the actual distillation process has the effect of non-directional aggregation. If a large amount of foam is accumulated and adheres to the inner wall, it will also affect the normal separation of gas and liquid phases.

[0004] In view of the above technical defects, a solution is now proposed. Utility Model Content

[0005] The utility model aims to provide a synthesis gas separation and purification device for dimethyl ether processing, so as to solve the problem that the foam generated in the distillation process has the effect of non-directional aggregation. If the foam accumulates in large quantities and adheres to the inner wall, it will also affect the normal separation of gas and liquid phases.

[0006] The purpose of the utility model can be achieved through the following technical scheme: a synthesis gas separation and purification device for dimethyl ether processing, comprising a tower body, wherein the bottom and top of the tower body are respectively installed with a bottom cover and a top cover, a plurality of baffles with through holes in the middle are installed at intervals inside the tower body, sieve plates are arranged between the through holes of adjacent baffles, a rotating rod is commonly installed between the plurality of sieve plates, a driving assembly for rotating the rotating rod and reciprocating up and down is installed on the upper end of the top cover; the rotating rod extends to the outside of the bottom of the tower body and is sleeved with a defoaming assembly, the defoaming assembly comprises a distribution plate connected to the bottom of the rotating rod, the outer ring side of the distribution plate is in the shape of an inclined platform and is provided with a guide groove 1 and a guide groove 2 from bottom to top, and an arc gap is provided on the baffle corresponding to the initial position of the guide groove 2.

[0007] Preferably, the driving assembly includes a motor and a cylinder, the motor is sleeved with a sleeve frame on the outside, the cylinder is symmetrically arranged on both sides of the middle of the top cover, and the output end of the cylinder is installed with a lifting frame.

[0008] Preferably, the lifting frame is in an "L" shape and the bottom is connected to the sleeve frame, and the output end of the motor is connected to one end of the rotating rod extending above the top cover.

[0009] Preferably, an upper wire mesh frame is inserted into the inner ring side of the tower body close to the top cover, and a lower wire mesh frame is inserted into the inner ring side of the tower body close to the bottom cover, and the upper wire mesh frame and the lower wire mesh frame are both formed by staggered overlapping steel wires.

[0010] Preferably, a raw material tube penetrates the side of the tower body close to the bottom cover, a catalyst tube 2 penetrates the side of the tower body away from the raw material tube, a gas outlet pipe penetrates the side of the tower body close to the top cover, and a catalyst tube 1 penetrates the side of the tower body away from the gas outlet pipe.

[0011] Preferably, a liquid outlet pipe facing downward is installed in the middle of the bottom cover, and one end of the liquid outlet pipe extending to the inside of the bottom cover does not contact the distribution plate.

[0012] Beneficial effects of the utility model:

[0013] (1) The utility model combines a defoaming component with a driving component to eliminate most of the foam generated by the gas-liquid two-phase in the dimethyl ether preparation process, so that a large amount of wall foam can be completely eliminated and the feed direction of the synthesis gas can be changed to improve the reaction efficiency. The double-set wire mesh frame can also be used to eliminate the foam from beginning to end, so as to achieve the complete elimination of the foam generated in the distillation process, which is beneficial to improving the dimethyl ether preparation efficiency;

[0014] (2) The defoaming process is as follows: first, the feed is guided by the guide groove 1 on the distribution plate, and the mixed gas collides with the guide groove 1 to form a vertical guide, and combines with the catalyst fed through the catalyst tube 1 and the catalyst tube 2 to form a gas-liquid two-phase distillation process, and the synthesis gas formed by the guide groove 1 forms a vertical guide along the inner wall of the tower body and passes through the arc gap upward. At this time, the foam generated on the inner wall of the tower body is accurately flushed; the guided synthesis gas can also vertically collide with the lower wire mesh frame, and the foam generated in this process is partially eliminated under the initial defoaming of the lower wire mesh frame. Finally, when the liquid surface gathers at the upper wire mesh frame, the third defoaming is completed. Combined with the distillation process after entering the tower body, the second defoaming is completed to obtain a triple defoaming application, which effectively reduces the probability of poor separation of the gas-liquid two-phase due to foam accumulation and adhesion to the inner wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings;

[0016] Figure 1 It is a structural stereogram of the entire utility model;

[0017] Figure 2 It is a rear view structural schematic diagram of the utility model;

[0018] Figure 3 It is a partial structural cutaway schematic diagram of the utility model;

[0019] Figure 4 It is a cross-sectional schematic diagram of the utility model;

[0020] Figure 5 It is a schematic diagram of the installation structure of the defoaming component of the utility model.

[0021] Legend: 1. Tower body; 2. Gas outlet pipe; 3. Raw material pipe; 4. Liquid outlet pipe; 5. Bottom cover; 6. Top cover; 7. Motor; 8. Sleeve frame; 9. Cylinder; 10. Lifting frame; 11. Catalyst tube one; 12. Catalyst tube two; 13. Baffle; 14. Rotating rod; 15. Sieve plate; 16. Upper wire mesh frame; 17. Lower wire mesh frame; 18. Distribution plate; 19. Guide groove one; 20. Guide groove two; 21. Arc gap. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Embodiment 1: This embodiment is used to solve the problem that the foam generated during the distillation process has the effect of non-directional aggregation. If the foam aggregates in large quantities and adheres to the inner wall, it will also affect the normal separation of the gas-liquid two phases.

[0024] See also Figure 1 - Figure 5 As shown, this embodiment is a synthesis gas separation and purification device for dimethyl ether processing, comprising a tower body 1, a bottom cover 5 and a top cover 6 are respectively installed at the bottom and top of the tower body 1, a plurality of baffles 13 with through holes in the middle are installed at intervals inside the tower body 1, a sieve plate 15 is arranged between the through holes of adjacent baffles 13, a rotating rod 14 is commonly installed between the plurality of sieve plates 15, a driving assembly for rotating the rotating rod 14 and reciprocating up and down is installed at the upper end of the top cover 6; the rotating rod 14 extends to the outside of the bottom of the tower body 1 and is sleeved with a defoaming assembly, the defoaming assembly comprises a distribution plate 18 connected to the bottom of the rotating rod 14, the outer ring side of the distribution plate 18 is in the shape of an inclined platform and is provided with a guide groove 19 and a guide groove 20 from bottom to top, and the baffle 13 is provided with an arc gap 21 at the initial position corresponding to the guide groove 20;

[0025] A raw material pipe 3 is passed through the side of the tower body 1 close to the bottom cover 5, a catalyst pipe 2 12 is passed through the side of the tower body 1 away from the raw material pipe 3, a gas outlet pipe 2 is passed through the side of the tower body 1 close to the top cover 6, and a catalyst pipe 1 11 is passed through the side of the tower body 1 away from the gas outlet pipe 2. A liquid outlet pipe 4 is installed in the middle of the bottom cover 5 and faces downward. One end of the liquid outlet pipe 4 extends to the inside of the bottom cover 5 and does not contact the distribution plate 18.

[0026] See also Figure 1 - Figure 5 As shown, the synthesis gas enters the tower body 1 through the raw material pipe 3, and the feed guidance is first completed by the guide groove 19 on the distribution plate 18. The mixed gas hits the guide groove 19 to form a vertical guide, and combines with the catalyst fed through the catalyst tube 11 and the catalyst tube 2 12 to form a gas-liquid two-phase distillation process, and the synthesis gas formed by the vertical guide of the guide groove 19 passes upward along the inner wall of the tower body 1 through the arc gap 21. At this time, the foam generated on the inner wall of the tower body 1 is accurately flushed, effectively reducing the probability of poor separation of the gas-liquid two-phase caused by foam aggregation and adhesion to the inner wall;

[0027] The driving assembly includes a motor 7 and a cylinder 9. The motor 7 is sleeved with a sleeve frame 8. The cylinder 9 is symmetrically arranged on both sides of the middle of the top cover 6. The output end of the cylinder 9 is installed with a lifting frame 10. The lifting frame 10 is "L" shaped and the bottom is connected to the sleeve frame 8. The output end of the motor 7 is connected to one end of the rotating rod 14 extending to the top of the top cover 6.

[0028] It should also be noted that during the distillation process, the sieve plate 15 exhibits a reciprocating motion process. Specifically, the cylinder 9 first drives the motor 7 to form a vertical reciprocating motion. The synchronous motor 7 starts and drives the sieve plate 15 to rotate between two adjacent baffles 13 through the rotating rod 14. The sieve plate 15 is further driven by the cylinder 9 to reciprocate up and down between the through holes of the baffle 13, so that the synthesis gas continuously contacts and impacts the guide groove 19 and the guide groove 20 on the distribution plate 18, respectively, to obtain the vertical guidance purpose at different positions.

[0029] Embodiment 2: This embodiment combines the technical content of embodiment 1 to solve the problem of foam accumulation caused by the immediate impact of the synthesis gas after entering the tower body 1 and the problem that foam is also formed on the liquid surface and cannot be quickly defoamed.

[0030] See also Figure 3 - Figure 5 As shown, a synthesis gas separation and purification device for dimethyl ether processing in this embodiment includes an upper wire mesh frame 16 inserted into the inner ring side of the tower body 1 close to the top cover 6, and a lower wire mesh frame 17 inserted into the inner ring side of the tower body 1 close to the bottom cover 5, and the upper wire mesh frame 16 and the lower wire mesh frame 17 are both formed by staggered overlap of steel wires;

[0031] See also Figure 3 - Figure 5 As shown, when the synthesis gas raw material of the first embodiment enters the tower body, it first forms an impact contact with the guide groove 19 on the distribution plate 18, and the guided synthesis gas raw material vertically hits the lower wire mesh frame 17. The foam generated in this process is partially eliminated under the preliminary defoaming of the lower wire mesh frame 17. After entering the tower body 1, the distillation process is carried out to complete the second defoaming. Finally, when the liquid surface gathers at the upper wire mesh frame 16, the third defoaming is completed, and finally the synthesis gas completes the entire distillation process and obtains dimethyl ether;

[0032] The dimethyl ether is discharged after separation through the gas outlet pipe 2, and the waste liquid after reaction is discharged through the liquid outlet pipe 4 at the bottom.

[0033] The use principle and process of the present invention:

[0034] Step 1: Synthesis gas enters the tower body 1 through the raw material pipe 3. First, the feed guide is completed by the guide groove 19 on the distribution plate 18. The mixed gas hits the guide groove 19 to form a vertical guide, and combines with the catalyst fed through the catalyst tube 11 and the catalyst tube 2 12 to form a gas-liquid two-phase distillation process. The synthesis gas formed by the vertical guide of the guide groove 19 passes upward along the inner wall of the tower body 1 through the arc gap 21, and the foam generated on the inner wall of the tower body 1 is accurately flushed, effectively reducing the probability of poor separation of the gas-liquid two-phase caused by foam aggregation and adhesion to the inner wall;

[0035] Step 2: Reciprocating movement process: The cylinder 9 drives the motor 7 to form a vertical reciprocating movement, and the synchronous motor 7 starts to drive the sieve plate 15 to rotate between two adjacent baffles 13 through the rotating rod 14, and then the sieve plate 15 is further driven by the cylinder 9 to reciprocate up and down between the through holes of the baffle 13, so that the synthetic gas continuously contacts and impacts the guide groove 19 and the guide groove 20 on the distribution plate 18, respectively, to obtain the vertical guide purpose at different positions;

[0036] Step 3: When the synthesis gas raw material enters the tower body, it first forms an impact contact with the guide groove 19 on the distribution plate 18, and the guided synthesis gas raw material vertically hits the lower wire mesh frame 17. The foam generated in this process is partially eliminated under the preliminary defoaming of the lower wire mesh frame 17. After entering the tower body 1, the distillation process is carried out to complete the second defoaming. Finally, when the liquid surface gathers at the upper wire mesh frame 16, the third defoaming is completed. Finally, the synthesis gas completes the entire distillation process and obtains dimethyl ether;

[0037] Combining Example 1 and Example 2, the defoaming component and the driving component can be combined to eliminate most of the foam generated by the gas-liquid two phases in the dimethyl ether preparation process, so that a large amount of wall foam can be completely eliminated and the feed direction of the synthesis gas can be changed to improve the reaction efficiency. The double-set wire mesh rack can also be used to eliminate the foam from beginning to end, so as to achieve complete elimination of the foam generated in the distillation process, which is beneficial to improving the dimethyl ether preparation efficiency.

[0038] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A synthesis gas separation and purification device for dimethyl ether processing, comprising a tower body (1), characterized in that: The bottom and top of the tower body (1) are respectively provided with a bottom cover (5) and a top cover (6); a plurality of baffles (13) having through holes in the middle are installed at intervals inside the tower body (1); a sieve plate (15) is arranged between the through holes of adjacent baffles (13); a rotating rod (14) is installed between the plurality of sieve plates (15); a driving assembly for rotating the rotating rod (14) and reciprocating up and down is installed at the upper end of the top cover (6); the rotating rod (14) extending to the outside of the bottom of the tower body (1) is sleeved with a defoaming assembly, the defoaming assembly comprising a distribution plate (18) connected to the bottom of the rotating rod (14); the outer ring side of the distribution plate (18) is in the shape of an inclined platform and is provided with a first guide groove (19) and a second guide groove (20) from bottom to top; the baffle (13) is provided with an arc gap (21) at the initial position corresponding to the second guide groove (20).

2. The synthesis gas separation and purification device for dimethyl ether processing according to claim 1, characterized in that: The driving assembly comprises a motor (7) and a cylinder (9); the motor (7) is sleeved with a sleeve frame (8) on its exterior; the cylinder (9) is symmetrically arranged on both sides of the middle of the top cover (6); and a lifting frame (10) is installed at the output end of the cylinder (9).

3. The synthesis gas separation and purification device for dimethyl ether processing according to claim 2, characterized in that: The lifting frame (10) is in an "L" shape and the bottom is connected to the sleeve frame (8), and the output end of the motor (7) is connected to an end of the rotating rod (14) extending to the top of the top cover (6).

4. The synthesis gas separation and purification device for dimethyl ether processing according to claim 1, characterized in that: An upper wire mesh frame (16) is inserted into the inner ring side of the tower body (1) close to the top cover (6), and a lower wire mesh frame (17) is inserted into the inner ring side of the tower body (1) close to the bottom cover (5). Both the upper wire mesh frame (16) and the lower wire mesh frame (17) are formed by staggered overlapping of steel wires.

5. The synthesis gas separation and purification device for dimethyl ether processing according to claim 1, characterized in that: A raw material pipe (3) penetrates the side of the tower body (1) close to the bottom cover (5), a catalyst pipe 2 (12) penetrates the side of the tower body (1) away from the raw material pipe (3), a gas outlet pipe (2) penetrates the side of the tower body (1) close to the top cover (6), and a catalyst pipe 1 (11) penetrates the side of the tower body (1) away from the gas outlet pipe (2).

6. The synthesis gas separation and purification device for dimethyl ether processing according to claim 1, characterized in that: A liquid outlet pipe (4) facing downward is installed in the middle of the bottom cover (5), and one end of the liquid outlet pipe (4) extending to the inside of the bottom cover (5) does not contact the distribution plate (18).

Images