A device for distributing feed to a PTA oxidation reactor

Abstract

The present invention discloses a device for distributing feeds in a PTA oxidation reactor, comprising a PTA oxidation reactor tank body, wherein the top of the PTA oxidation reactor tank body is fixedly connected with a first feed pipe and a second feed pipe which are symmetrically arranged, and the first feed pipe and the second feed pipe both penetrate the PTA oxidation reactor tank body. The present invention utilizes the influence of the chemical reaction ratio on the chemical reaction balance, and by adding a raw material distributor, the raw material mixture can be distributed to the vicinity of each air nozzle, so that after the air enters the PTA oxidation reactor tank body, there is enough raw material mixture to react with it, and the ratio of air to the raw material mixture at the air nozzle is adjusted, the occurrence of excessive chemical reaction is reduced, and the amount of combustion and intermediate products is reduced, thereby reducing material consumption and improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of feed distribution equipment, and in particular to a feed distribution equipment for a PTA oxidation reactor. Background Art

[0002] At present, most PTA oxidation reactors at home and abroad adopt the method of allowing the raw material mixture and air to enter the lower part of the reactor through a pipeline, and fully stirring the raw material mixture and air through the agitator inside the reactor. During the stirring process, the reaction continues. Since the stirring effect directly affects the reaction efficiency and the generation of by-products, the agitator blades need to be specially designed and need to reach a certain speed, which causes the agitator to consume a lot of power and the mixing effect can only reach a certain level, and the raw material mixture and air cannot be thoroughly stirred evenly. In addition, too high a speed will cause the agitator to wear and malfunction, increase the instability of production, and increase the maintenance cost. Even if the speed is increased to the maximum extent possible, the air will over-react with the acetic acid and para-xylene in the raw materials at the air feed inlet before being mixed by the agitator, generating by-products such as carbon dioxide, water and methyl acetate, so that a certain amount of acetic acid and para-xylene are consumed in the entire oxidation reaction process, and the production cost is relatively high. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a device for feed distribution in a PTA oxidation reactor.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a device for feed distribution of a PTA oxidation reactor, comprising a PTA oxidation reactor tank body, the top of the PTA oxidation reactor tank body is fixedly connected with a first feed pipe and a second feed pipe which are symmetrically arranged, the first feed pipe and the second feed pipe both penetrate the PTA oxidation reactor tank body, the tops of the first feed pipe and the second feed pipe are fixedly connected with a total feed pipe, the bottom ends of the first feed pipe and the second feed pipe are fixedly connected with a distributor, a hollow groove is arranged at the center of the distributor, a distribution channel is opened inside the distributor, six discharge assemblies arranged in a circular array are fixedly connected to the bottom end of the distributor, the inner top wall of the PTA oxidation reactor tank body is fixedly connected with a stirring device, and the bottom end of the PTA oxidation reactor tank body is fixedly connected with a mixing discharge pipe.

[0005] As a further description of the above technical solution:

[0006] The discharge assembly comprises a discharge pipe, the discharge pipe is communicated with the bottom end of the distributor, and the bottom end of the discharge pipe is fixedly connected with an inclined material nozzle.

[0007] As a further description of the above technical solution:

[0008] Six air nozzles are fixedly connected to the inner wall of the PTA oxidation reactor tank, the six air nozzles correspond to the discharge components one by one, and the inclination angle of the air nozzles is the same as that of the material nozzles.

[0009] As a further description of the above technical solution:

[0010] The stirring device includes a driving motor, which is fixedly connected to the inner top wall of the PTA oxidation reactor tank. The output end of the driving motor is fixedly connected to a stirring roller through a coupling. The outer surface of the stirring roller is fixedly connected to a stirring blade. The outer surface of the stirring roller is sleeved with a stirring wheel near the bottom end.

[0011] As a further description of the above technical solution:

[0012] One end of the stirring blade away from the stirring roller is fixedly connected with a semicircular scraper with a hollow groove.

[0013] As a further description of the above technical solution:

[0014] The stirring wheel is provided with blades spirally upward.

[0015] The present invention has the following beneficial effects:

[0016] Compared with the prior art, the invention utilizes the influence of the chemical reaction ratio on the chemical reaction balance. The original feeding method only feeds the raw material mixture into the PTA oxidation reactor tank body, and the air enters the reactor through multiple nozzles. At the air nozzle, since the raw material mixture does not have enough raw materials to contact the air in the first time, the air ratio at the air nozzle is too large, excessive chemical reaction occurs, combustion occurs, and a large amount of intermediate products are generated; by adding a raw material distributor, the raw material mixture can be distributed to the vicinity of each air nozzle, so that after the air enters the PTA oxidation reactor tank body, there is enough raw material mixture to react with it, and the ratio of air to the raw material mixture at the air nozzle is adjusted, the occurrence of excessive chemical reaction is reduced, and the amount of combustion and intermediate products is reduced, thereby reducing material consumption and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of a device for distributing feed to a PTA oxidation reactor proposed by the present invention;

[0018] Figure 2 A bottom view of a distributor of a device for distributing feed to a PTA oxidation reactor proposed by the present invention;

[0019] Figure 3 A cross-sectional view of a distributor of an apparatus for distributing feed to a PTA oxidation reactor proposed by the present invention.

[0020] Legend:

[0021] 1. PTA oxidation reactor tank; 2. First feed pipe; 3. Second feed pipe; 4. Main feed pipe; 5. Distributor; 6. Discharge pipe; 7. Material nozzle; 8. Drive motor; 9. Coupling; 10. Stirring roller; 11. Stirring blade; 12. Stirring wheel; 13. Mixing discharge pipe; 14. Material distribution channel; 15. Hollow groove; 16. Air nozzle. DETAILED DESCRIPTION

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

[0023] Reference Figure 1-3 The present invention provides a device for distributing feed in a PTA oxidation reactor, comprising a PTA oxidation reactor tank body 1, the top of the PTA oxidation reactor tank body 1 is fixedly connected with a first feed pipe 2 and a second feed pipe 3 which are symmetrically arranged, the first feed pipe 2 and the second feed pipe 3 both penetrate the PTA oxidation reactor tank body 1, the tops of the first feed pipe 2 and the second feed pipe 3 are fixedly connected with a total feed pipe 4, the bottoms of the first feed pipe 2 and the second feed pipe 3 are fixedly connected with a distributor 5, a hollow groove 15 is arranged at the center of the distributor 5, a material distribution channel 14 is provided inside the distributor 5, six discharge assemblies arranged in a circular array are fixedly connected to the bottom end of the distributor 5, a stirring device is fixedly connected to the inner top wall of the PTA oxidation reactor tank body 1, a mixing discharge pipe 13 is fixedly connected to the bottom end of the PTA oxidation reactor tank body 1, the material is discharged from the six discharge pipes 6 through the arranged distributor 5, and then the mixing condition of the mixed material and air is improved through the air nozzle 16.

[0024] The discharge assembly includes a discharge pipe 6, which is connected to the bottom end of the distributor 5. The bottom end of the discharge pipe 6 is fixedly connected to an inclined material nozzle 7. The inclined material nozzle 7 can prolong the mixing time of the material and the air, so that the mixed material is better.

[0025] Six air nozzles 16 are fixedly connected to the inner wall of the PTA oxidation reactor tank 1. The six air nozzles 16 correspond to the discharge components one by one, and the inclination angle of the air nozzle 16 is the same as that of the material nozzle 7. The air sprayed from the air nozzle 16 can be mixed with the material sprayed from the material nozzle 7 at the first time.

[0026] The stirring device includes a driving motor 8, which is fixedly connected to the inner top wall of the PTA oxidation reactor tank body 1. The output end of the driving motor 8 is fixedly connected to a stirring roller 10 through a coupling 9. The outer surface of the stirring roller 10 is fixedly connected to a stirring blade 11. The outer surface of the stirring roller 10 is sleeved with a stirring wheel 12 near the bottom end. The stirring device can accelerate the reaction and make the reaction more thorough.

[0027] A semicircular scraper with a hollow groove is fixedly connected to one end of the stirring blade 11 away from the stirring roller 10, so as to stir the mixed material close to the tank more vigorously.

[0028] The stirring wheel 12 is provided with upward spiral blades, which can make the materials at the bottom turn upwards, so that the stirring and mixing are more uniform.

[0029] Working principle: When in use, the mixed material enters the distributor 5 from the first feed pipe 2 and the second feed pipe 3, and then enters the PTA oxidation reactor tank 1 from the discharge pipe 6 and the material nozzle 7. At this time, the air nozzle 16 starts to deliver air, so that the air contacts and mixes with the mixed material for the first time, and then the drive motor 8 is started. The drive motor 8 drives the stirring blade 11 to rotate to stir the mixed material and speed up the reaction.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for distributing feed to a PTA oxidation reactor, comprising a PTA oxidation reactor tank (1), characterized in that: The top of the PTA oxidation reactor tank body (1) is fixedly connected to a symmetrically arranged first feed pipe (2) and a second feed pipe (3), both of which penetrate the PTA oxidation reactor tank body (1), the tops of the first feed pipe (2) and the second feed pipe (3) are fixedly connected to a total feed pipe (4), the bottoms of the first feed pipe (2) and the second feed pipe (3) are fixedly connected to a distributor (5), a hollow groove (15) is arranged at the center of the distributor (5), a material distribution channel (14) is provided inside the distributor (5), six material discharging components arranged in a circular array are fixedly connected to the bottom end of the distributor (5), a stirring device is fixedly connected to the inner top wall of the PTA oxidation reactor tank body (1), and a mixing material discharging pipe (13) is fixedly connected to the bottom end of the PTA oxidation reactor tank body (1); The discharge assembly comprises a discharge pipe (6), the discharge pipe (6) is connected to the bottom end of the distributor (5), and the bottom end of the discharge pipe (6) is fixedly connected to a material nozzle (7) arranged obliquely; Six air nozzles (16) are fixedly connected to the inner wall of the PTA oxidation reactor tank (1), the six air nozzles (16) correspond to the discharge components one by one, and the inclination angle of the air nozzles (16) is the same as that of the material nozzles (7); The stirring device comprises a driving motor (8), the driving motor (8) is fixedly connected to the inner top wall of the PTA oxidation reactor tank (1), the output end of the driving motor (8) is fixedly connected to a stirring roller (10) via a coupling (9), the outer surface of the stirring roller (10) is fixedly connected to a stirring blade (11), and the outer surface of the stirring roller (10) is sleeved with a stirring wheel (12) near the bottom end.

2. The device for distributing feed to a PTA oxidation reactor according to claim 1, characterized in that: A semicircular scraper with a hollow groove is fixedly connected to one end of the stirring blade (11) away from the stirring roller (10).

3. The device for distributing feed to a PTA oxidation reactor according to claim 1, characterized in that: The stirring wheel (12) is provided with blades which spiral upward.

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