Distillation device for recovering sulfuric acid in synthesis process of 3, 4, 5-trifluorobromophenyl

Abstract

The utility model relates to a distillation device for recovering sulfuric acid in the synthesis process of 3, 4, 5-trifluorobromophenyl, which comprises a distillation tower, an output interface and a waste discharge interface are respectively formed at the upper end and the lower end of the distillation tower, the output interface is fixedly connected with a T-shaped tee joint, and the tee joint comprises a vertical connecting pipe at the lower part and a horizontal connecting pipe at the upper part. Flanges are respectively formed at the lower end of the vertical connecting pipe and two ends of the horizontal connecting pipe; a transverse guide groove is formed in the outer wall of the horizontal connecting pipe on the tee joint, and the guide groove is located over the vertical connecting pipe; a cover plate with an arc-shaped longitudinal section and covering a guide groove in the tee joint abuts against the outer wall of the tee joint, a cylindrical ceramic piston is inserted into a horizontal connecting pipe of the tee joint, piston rings are fixedly connected to the outer walls of the two ends of the ceramic piston in an inserted and sleeved mode, and the piston rings abut against the inner wall of the horizontal connecting pipe on the tee joint in a pressed mode. The tee joint is mounted at the top of the distillation device to realize two-interface output, and meanwhile, a valve group structure is arranged on the tee joint to control single-interface output; therefore, the distillation device is shared.

Description

Technical field:

[0001] The utility model relates to the technical field of distillation towers, and more specifically to a distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl. Background technology:

[0002] 3,4,5-Trifluorobromobenzene is an important chemical intermediate, widely used in the fields of pesticides and medicine. The carbon-bromine bond it contains can be functionalized in various ways by preparing grout reagents, and further used to synthesize various polyfluorinated active compounds. At present, waste liquid is produced in the preparation process of 3,4,5-trifluorobromobenzene. The waste liquid is not only difficult to handle, but also has a high cost. After repeated research and experiments, the waste liquid can be recycled and reused in sulfuric acid. Therefore, a process for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl was proposed, which turned waste into treasure, that is, it can reduce the cost of subsequent waste liquid treatment and effectively implement energy conservation and emission reduction. At the same time, the recovered sulfuric acid can be used for self-use or sold, and it also generates income.

[0003] At present, the recovery of sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl involves a distillation process, and the distillation is carried out in a distillation tower. In order to realize the process of recovering sulfuric acid, it is necessary to purchase a distillation tower, which is costly. However, the factory already has a distillation tower used to prepare other chemical intermediates, and someone proposed to make the existing distillation tower a common one, so there is no need to purchase a new distillation tower. However, the top of the shared distillation tower has only one outlet, which needs to be modified and a branch interface is set, and the branch interface is required to be opened and closed separately. Therefore, a structure that can realize the selective opening and closing of the branch interface is needed. Utility model content:

[0004] The utility model aims to overcome the shortcomings of the prior art and provides a distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl. A tee is installed on the top of the distillation device to realize two-port output. At the same time, a valve group structure is provided on the tee to control the single-port output.

[0005] A distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl comprises a distillation tower, wherein the upper and lower ends of the distillation tower are respectively formed with an output interface and a waste discharge interface, an input interface is formed on the tower wall in the middle of the distillation tower, and the output interface is fixedly connected with a T-shaped tee, the tee comprises a lower vertical direct pipe and an upper horizontal pipe, and flanges are respectively formed at the lower end of the vertical direct pipe and the two ends of the horizontal pipe:

[0006] A transverse guide groove is formed on the outer wall of the horizontal pipe on the tee, and the guide groove is located directly above the vertical pipe; a cover plate with a circular arc-shaped longitudinal section covering the guide groove on the tee is abutted against the outer wall of the tee, a cylindrical ceramic piston is inserted in the horizontal pipe of the tee, and piston rings are fixedly connected to the outer walls of the two ends of the ceramic piston, and the piston rings are pressed against the inner wall of the horizontal pipe on the tee; bolts are inserted on the cover plate, and the bolts pass through the guide grooves of the tee and are screwed to the middle part of the ceramic piston; an ear seat is formed on the outer wall of the cover plate, and a transverse screw is inserted on the ear seat, and the two ends of the screw are respectively inserted into the flanges at the two ends of the horizontal pipe; positioning nuts are screwed on the screws close to the flanges at the two ends of the horizontal pipe, and the positioning nuts are respectively pressed against the flanges at the two ends of the horizontal pipe; screws are screwed on the ear seat, and the ends of the screws are pressed against the screws.

[0007] Preferably, the two ends of the guide groove on the tee are distributed at the two ends of the vertical pipe, and the screws on both sides of the ear seat are respectively threaded with left and right opposite limiting nuts.

[0008] Preferably, the diameter of the inner wall of the cover plate is equal to the diameter of the outer wall of the horizontal pipe on the tee.

[0009] Preferably, the length of the cover plate is greater than twice the length of the guide groove on the tee, and a rectangular ring-shaped sealing ring is embedded and fixed on the inner wall around the cover plate, and the sealing ring is pressed against the outer wall of the horizontal pipe on the tee.

[0010] Preferably, the lateral distance between the end of the horizontal connecting pipe on the tee and the vertical connecting pipe is respectively greater than the length of the guide groove on the tee.

[0011] Preferably, a sealing gasket is inserted into the bolt, the sealing gasket is clamped between the head of the bolt and the cover plate, and the diameter of the screw part of the bolt is equal to the groove width of the guide groove on the tee.

[0012] Preferably, the ceramic piston is located on the left side of the vertical pipe on the tee, and the limiting nut on the left side of the ear seat abuts against the side wall of the ear seat.

[0013] The beneficial effects of the utility model are:

[0014] A tee is installed on the top of the distillation device to realize two-port output, and a valve group structure is provided on the tee to control the single-port output, thereby realizing the sharing of the distillation device. Description of the drawings:

[0015] Figure 1 It is a partial cross-sectional structural schematic diagram of the utility model;

[0016] Figure 2 for Figure 1 A partial schematic diagram of point A in the middle.

[0017] In the figure: 1. distillation tower; 11. output interface; 12. waste discharge interface; 13. input interface; 2. tee; 3. ceramic piston; 4. piston ring; 5. cover plate; 6. screw; 7. screw; 8. limit nut; 9. positioning nut; 10. bolt; 20. sealing ring. Specific implementation method:

[0018] Example: See Figure 1 , 2 As shown, a distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl includes a distillation tower 1, an output interface 11 and a waste discharge interface 12 are formed at the upper and lower ends of the distillation tower 1, an input interface 13 is formed on the tower wall in the middle of the distillation tower 1, and the output interface 11 is fixedly connected with a T-shaped tee 2, the tee 2 includes a lower vertical direct pipe and an upper horizontal pipe, and flanges are formed at the lower end of the vertical direct pipe and the two ends of the horizontal pipe respectively:

[0019] A transverse guide groove is formed on the outer wall of the horizontal pipe on the tee 2, and the guide groove is located just above the vertical pipe; a cover plate 5 with a circular arc-shaped longitudinal section covering the guide groove on the tee 2 is abutted against the outer wall of the tee 2, a cylindrical ceramic piston 3 is inserted in the horizontal pipe of the tee 2, and piston rings 4 are fixedly connected to the outer walls of the two ends of the ceramic piston 3, and the piston ring 4 is pressed against the inner wall of the horizontal pipe on the tee 2; a bolt 10 is inserted into the cover plate 5, and the bolt 10 passes through the guide groove of the tee 2 and is screwed to the middle part of the ceramic piston 3, an ear seat 51 is formed on the outer wall of the cover plate 5, and a transverse screw rod 6 is inserted into the ear seat 51, and the two ends of the screw rod 6 are respectively inserted into the flanges at the two ends of the horizontal pipe; a positioning nut 9 is screwed on the screw rod 6 close to the flanges at the two ends of the horizontal pipe, and the positioning nut 9 is respectively pressed against the flanges at the two ends of the horizontal pipe; a screw 7 is screwed on the ear seat 51, and the end of the screw 7 is pressed against the screw 6.

[0020] The two ends of the guide groove on the tee 2 are distributed at the two ends of the vertical pipe. The screws 6 on both sides of the ear seat 51 are respectively screwed with left and right opposite limit nuts 8, and the limit nuts 8 are located at two limit points during the movement of the ear seat 51.

[0021] The diameter of the inner wall of the cover plate 5 is equal to the diameter of the outer wall of the horizontal pipe on the tee 2 , and the cover plate 5 is attached to the outer wall of the tee 2 .

[0022] The length of the cover plate 5 is greater than twice the length of the guide groove on the tee 2. A rectangular ring-shaped sealing ring 20 is embedded and fixed on the inner wall around the cover plate 5. The sealing ring 20 is pressed against the outer wall of the horizontal pipe on the tee 2.

[0023] The lateral distance between the end of the horizontal pipe on the tee 2 and the vertical pipe is respectively greater than the length of the guide groove on the tee 2; the above structure ensures that the cover plate 5 always covers the guide groove during the movement of the ceramic piston 3.

[0024] A sealing gasket is inserted into the bolt 10, which is clamped between the head of the bolt 10 and the cover plate 5. The diameter of the screw portion of the bolt 10 is equal to the groove width of the guide groove on the tee 2; therefore, the bolt 10 and the cover plate 5 are made of corrosion-resistant ceramic material, and the sealing gasket, sealing ring 20 and piston ring 4 are all made of polytetrafluoroethylene.

[0025] The ceramic piston 3 is located on the left side of the vertical pipe on the tee 2, and the limit nut 8 on the left side of the ear seat 51 abuts against the side wall of the ear seat 51. Figure 2 As shown; the left end port of the tee 2 is closed based on the ceramic piston 3; the right end port of the tee 2 is opened.

[0026] Working principle: The utility model is a distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl. This structure is an interface structure added to the top of the tower in order to realize the sharing of the distillation tower 1. It is proposed to connect the tee 2, that is, to add an output port;

[0027] The sharing of the distillation tower 1 means that it can be used in both the sulfuric acid recovery line and the manufacturing lines of other chemical intermediates, but when the distillation tower 1 is working, only one line can be operated, and both lines cannot be operated; therefore, only one output port at the top of the distillation tower 1 can be opened, and when one is opened, the other needs to be closed; therefore, a ceramic piston 3 structure is provided in the tee 2, and based on the movement of the ceramic piston 3, one output port can be opened and the other output port can be closed at the same time.

[0028] The embodiments are used to illustrate the present invention, but not to limit the present invention. Any person skilled in the art may modify the embodiments without violating the spirit and scope of the present invention, and therefore the scope of protection of the present invention shall be as set forth in the claims of the present invention.

Claims

1. A distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl, comprising a distillation tower (1), wherein the upper and lower ends of the distillation tower (1) are respectively formed with an output interface (11) and a waste discharge interface (12), and an input interface (13) is formed on the tower wall in the middle of the distillation tower (1), characterized in that: The output interface (11) is fixedly connected with a T-shaped tee (2), which includes a vertical direct pipe at the bottom and a horizontal pipe at the top. Flanges are formed at the bottom end of the vertical direct pipe and at both ends of the horizontal pipe respectively: A transverse guide groove is formed on the outer wall of the horizontal pipe on the tee (2), and the guide groove is located directly above the vertical pipe; a cover plate (5) with a longitudinal arc-shaped cross section and covering the guide groove on the tee (2) is pressed against the outer wall of the tee (2); a cylindrical ceramic piston (3) is inserted into the horizontal pipe of the tee (2), and piston rings (4) are fixedly connected to the outer walls of the two ends of the ceramic piston (3), and the piston rings (4) are pressed against the inner wall of the horizontal pipe on the tee (2); a bolt (10) is inserted into the cover plate (5), and the bolt (10) ) passes through the guide groove of the tee (2) and is screwed to the middle part of the ceramic piston (3); an ear seat (51) is formed on the outer wall of the cover plate (5), and a horizontal screw rod (6) is inserted on the ear seat (51), and the two ends of the screw rod (6) are respectively inserted on the flanges at the two ends of the horizontal pipe; the screw rod (6) close to the flanges at the two ends of the horizontal pipe is screwed with a positioning nut (9), and the positioning nut (9) is respectively pressed against the flanges at the two ends of the horizontal pipe; the ear seat (51) is screwed with a screw (7), and the end of the screw (7) is pressed against the screw rod (6).

2. A distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl according to claim 1, characterized in that: The two ends of the guide groove on the tee (2) are distributed at the two ends of the vertical pipe, and the screw rods (6) on both sides of the ear seat (51) are respectively screwed with left and right opposite limiting nuts (8).

3. A distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl according to claim 1, characterized in that: The diameter of the inner wall of the cover plate (5) is equal to the diameter of the outer wall of the horizontal pipe on the tee (2).

4. A distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl according to claim 3, characterized in that: The length of the cover plate (5) is greater than twice the length of the guide groove on the tee (2). A rectangular ring-shaped sealing ring (20) is embedded and fixed on the inner wall around the cover plate (5), and the sealing ring (20) is pressed against the outer wall of the horizontal pipe on the tee (2).

5. A distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl according to claim 4, characterized in that: The transverse distance between the end of the horizontal connecting pipe on the tee (2) and the vertical connecting pipe is respectively greater than the length of the guide groove on the tee (2).

6. A distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl according to claim 1, characterized in that: The bolt (10) is sleeved with a sealing gasket, which is clamped between the head of the bolt (10) and the cover plate (5). The diameter of the screw part of the bolt (10) is equal to the groove width of the guide groove on the tee (2).

7. A distillation device for recovering sulfuric acid in the synthesis process of 3,4,5-trifluorobromophenyl according to claim 2, characterized in that: The ceramic piston (3) is located on the left side of the vertical pipe on the tee (2), and the limiting nut (8) on the left side of the ear seat (51) abuts against the side wall of the ear seat (51).

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