CN211798914U

CN211798914U - Ammonium sulfate crystallizer

Info

Publication number: CN211798914U
Application number: CN202020446668.XU
Authority: CN
Inventors: 卢世健; 余黎明
Original assignee: Jiangsu Lingrui Chemical Technology Co ltd
Current assignee: Jiangsu Lingrui Chemical Technology Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-10-30
Anticipated expiration: 2030-03-31

Abstract

The utility model provides a thiamine crystallizer, which comprises a tank body, the top of the jar body is equipped with the gaseous phase export, the top of the internal portion of jar is equipped with the flight demister in proper order along gaseous phase flow direction, washing unit and defoaming net, the internal portion of jar is equipped with draft tube and separating cylinder, the outside of draft tube is located to the separating cylinder, the lower extreme of draft tube is equipped with gas ammonia nozzle and circulation liquid nozzle, the circulation liquid nozzle links to each other with circulation liquid pipe, circulation liquid pipe links to each other with the circulating pump, the import of circulating pump passes through the pipeline and links to each other with a plurality of circulation liquid mouths, be equipped with a plurality of caprolactam sulfate nozzles on the circulation liquid pipe, and the inside of circulation liquid pipe is located to the one end of caprolactam sulfate nozzle, caprolactam sulfate. The utility model discloses help making the neutralization reaction in the draft tube more abundant, temperature distribution is more even, has also helped reducing the organic liquid drop smugglied secretly among the vapor evaporation process.

Description

Ammonium sulfate crystallizer

Technical Field

The utility model relates to a chemical industry technical field, concretely relates to ammonium sulfate crystallizer.

Background

The caprolactam product is an important organic chemical raw material, is mainly used for producing polyamide chips through polymerization, and can be further processed into nylon fibers, engineering plastics, plastic films and the like, and has wide application markets. The ammonium sulfate solution is concentrated and crystallized through the heat of neutralization reaction, and separated from the coarse caprolactam in a settling separation zone in the crystallizer, and the ammonium sulfate magma at the lower part is pumped out by a pump and then sent to the processes of thickening, centrifuging, drying and the like to form the ammonium sulfate finished product; and after the crude caprolactam on the upper part of the crystallizer is pumped out by a pump, separating ammonium sulfate crystals and ammonium sulfate solution carried by the crude caprolactam by a decanter, and feeding the crude caprolactam to a benzene extraction process. Caprolactam sulfate nozzles and gas ammonia nozzles in the existing ammonium sulfate crystallizer are generally arranged on the inner wall of a guide cylinder of the crystallizer, but have the following problems: 1. the reaction has large heat release, the temperature rise at the caprolactam sulfate nozzle is very large, the high-temperature corrosion of the nozzle is easily caused, and the nozzle needs to be periodically checked and replaced; 2. the nozzle is arranged on the wall of the guide flow cylinder, so that the guide flow cylinder is not uniformly mixed, the problem of local overheating exists, and the quality of caprolactam is easily influenced; 3. because the upper part is not completely separated from gas and liquid, the evaporation condensate carries liquid drops, and the COD value of the condensate is influenced. Therefore, an ammonium sulfate crystallizer capable of solving the existing problems is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an ammonium sulfate crystallizer aiming at the defects of the prior art.

The utility model provides a following technical scheme:

a thiamine crystallizer comprises a tank body, wherein a gas phase outlet is formed in the top of the tank body, a spiral plate demister, a flushing device and a defoaming net are sequentially arranged above the tank body along the gas phase flowing direction, a guide cylinder and a separating cylinder are arranged in the tank body, the separating cylinder is arranged on the outer side of the guide cylinder, a gas ammonia nozzle and a circulating liquid nozzle are arranged at the lower end of the guide cylinder, the circulating liquid nozzle is connected with a circulating liquid pipe, the circulating liquid pipe is connected with a circulating pump, the inlet of the circulating pump is connected with a plurality of circulating liquid ports through a pipeline, the inlet of the circulating liquid port is positioned below the separating cylinder, a plurality of caprolactam sulfate nozzles are arranged on the circulating liquid pipe, the caprolactam sulfate nozzles are connected with a caprolactam sulfate pipe, and one end of the caprolactam sulfate nozzle is arranged in the circulating liquid pipe, the lower part of the caprolactam sulfate nozzle is sealed, a plurality of liquid outlets are arranged on one side of the caprolactam sulfate nozzle, and the liquid outlet direction of the liquid outlets is consistent with the liquid flow direction in the circulating liquid pipe.

Preferably, the top and the bottom of the guide shell are both open, and a stirring device is arranged at the bottom of the tank body below the guide shell.

Preferably, the flushing device comprises a cleaning pipe, and a plurality of cleaning nozzles are arranged at the bottom of the cleaning pipe.

Preferably, the bottom of the tank body is also provided with a plurality of crystal slurry outlet pipes.

Preferably, the circulation liquid nozzle is disposed below the gas ammonia nozzle.

Preferably, the caprolactam sulfate nozzle is connected with the caprolactam sulfate pipe through a flange.

Preferably, the number of the caprolactam sulfate nozzles is 1-5, and the number of the liquid outlets at one side of each caprolactam sulfate nozzle is 10-100.

The utility model has the advantages that:

the caprolactam sulfate nozzle is moved to the circulating liquid pipe, the caprolactam sulfate liquid is firstly mixed with the circulating liquid and then reacts, and then enters the guide cylinder, and the caprolactam sulfate nozzle is connected with the caprolactam sulfate pipe through the flange, so that the caprolactam sulfate nozzle is more convenient to overhaul and replace, the neutralization reaction in the guide cylinder is more sufficient, and the temperature distribution is more uniform; the utility model discloses set up the spiral plate demister at the crystallizer top and remove the foam net, helped reducing the organic liquid drop that smugglies secretly among the vapor evaporation process to help reducing evaporation condensate COD value, reduced the sewage treatment expense, prolonged the operation cycle of crystallizer simultaneously.

Drawings

The accompanying drawings are included to provide a further understanding and description of the invention.

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of the spiral plate demister of the present invention;

FIG. 3 is a schematic view of the caprolactam sulfate nozzle of the present invention installed;

fig. 4 is a flushing device of the present invention.

Labeled as: 1. a tank body; 2. a draft tube; 3. a separation cylinder; 4. a gas ammonia nozzle; 5. a circulating liquid nozzle; 6. a circulating liquid pipe; 7. a circulation pump; 8. a circulating liquid port; 9. a caprolactam sulfate nozzle; 10. a caprolactam sulfate pipe; 11. a liquid outlet; 12. a stirring device; 13. a gas phase outlet; 14. a spiral plate demister; 15. a flushing device; 16. a defoaming net; 17. cleaning the tube; 18. cleaning the nozzle; 19. and a crystal slurry outlet pipe.

Detailed Description

As shown in fig. 1 to 4, an ammonium sulfate crystallizer includes a tank 1, a gas phase outlet 13 is provided at the top of the tank 1, a spiral plate demister 14, a flushing device 15 and a defoaming net 16 are sequentially provided above the inside of the tank 1 along the gas phase flow direction, the flushing device 15 includes a cleaning pipe 17, a plurality of cleaning nozzles 18 are provided at the bottom of the cleaning pipe 17, and a plurality of crystal slurry outlet pipes 19 are further provided at the bottom of the tank 1.

The inside draft tube 2 and the partition cylinder 3 that is equipped with of jar body 1 separate a section of thick bamboo 3 and locate the outside of draft tube 2, and the top and the bottom of draft tube 2 are all opened, and jar body 1 bottom below the draft tube 2 is equipped with agitating unit 12. The lower extreme of draft tube 2 is equipped with gas ammonia nozzle 4 and circulation liquid nozzle 5, the below of gas ammonia nozzle 4 is located to circulation liquid nozzle 5, circulation liquid nozzle 5 links to each other with circulation liquid pipe 6, circulation liquid pipe 6 links to each other with circulation pump 7, circulation pump 7's import passes through the pipeline and links to each other with a plurality of circulation liquid mouth 8, and the import department of circulation liquid mouth 8 is located the below of separating section of thick bamboo 3, be equipped with a plurality of caprolactam sulfate nozzle 9 on the circulation liquid pipe 6, caprolactam sulfate nozzle 9 passes through the flange and links to each other with caprolactam sulfate pipe 10, and the inside of circulation liquid pipe 6 is located to caprolactam sulfate nozzle 9's one end, caprolactam sulfate nozzle 9 lower part is sealed, a plurality of liquid outlets 11 in caprolactam sulfate nozzle 9 one side, the play liquid direction of liquid outlet 11 is unanimo. The number of caprolactam sulfate nozzles 9 is 1-5, and the number of liquid outlets 11 on one side of each caprolactam sulfate nozzle 9 is 10-100.

The working principle of the embodiment is as follows: adding caprolactam sulfate into a circulating pipe through a caprolactam sulfate nozzle, mixing the caprolactam sulfate with circulating liquid, then adding ammonia into a guide cylinder 2 of a crystallizer for neutralization reaction, under the action of stirring, enabling ammonium sulfate mother liquor and crude caprolactam to move from bottom to top in the guide cylinder 2, enabling water vapor to carry a small amount of amide oil to become a gas phase after the gas phase reaches the upper part of the guide cylinder 2, separating most of the liquid phase after the gas phase passes through a spiral plate demister 14 and a defoaming net 16, and enabling the water vapor to leave the crystallizer for condensation to enable the concentration of ammonium sulfate mother liquor to rise; the ammonium sulfate mother liquor and the crude caprolactam flow downwards outside the guide cylinder 2 to enter a crystallization area and a phase separation area, ammonium sulfate crystal slurry is pumped out from the bottom, and the crude caprolactam after phase separation is pumped out and then is sent to an amide oil and ammonium sulfate solution separation device.

In the embodiment, the caprolactam sulfate nozzle 9 is moved to the circulating liquid pipe 6, the caprolactam sulfate liquid is firstly mixed with the circulating liquid and then reacts, and then enters the guide cylinder 2, and the caprolactam sulfate nozzle 9 is connected with the caprolactam sulfate pipe 10 through a flange, so that the caprolactam sulfate nozzle 9 is more convenient to overhaul and replace, the neutralization reaction in the guide cylinder 2 is more sufficient, and the temperature distribution is more uniform; the spiral plate demister 14 and the defoaming net 16 are arranged at the top of the crystallizer, so that organic liquid drops entrained in the water vapor evaporation process are reduced, the COD value of evaporation condensate is reduced, the cost of sewage treatment is reduced, and the operation period of the crystallizer is prolonged.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalent changes may be made to some of the technical features of the embodiments. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A thiamine crystallizer comprises a tank body and is characterized in that a gas phase outlet is formed in the top of the tank body, a spiral plate demister, a flushing device and a defoaming net are sequentially arranged above the tank body along the gas phase flowing direction, a guide cylinder and a separating cylinder are arranged inside the tank body, the separating cylinder is arranged on the outer side of the guide cylinder, a gas ammonia nozzle and a circulating liquid nozzle are arranged at the lower end of the guide cylinder, the circulating liquid nozzle is connected with a circulating liquid pipe, the circulating liquid pipe is connected with a circulating pump, the inlet of the circulating pump is connected with a plurality of circulating liquid ports through a pipeline, the inlet of the circulating liquid port is located below the separating cylinder, a plurality of caprolactam sulfate nozzles are arranged on the circulating liquid pipe, the caprolactam sulfate nozzles are connected with a caprolactam sulfate pipe, and one end of the caprolactam sulfate nozzle is arranged inside the circulating liquid pipe, the lower part of the caprolactam sulfate nozzle is sealed, a plurality of liquid outlets are arranged on one side of the caprolactam sulfate nozzle, and the liquid outlet direction of the liquid outlets is consistent with the liquid flow direction in the circulating liquid pipe.

2. The ammonium sulfate crystallizer of claim 1, wherein the top and the bottom of the guide cylinder are open, and a stirring device is arranged at the bottom of the tank body below the guide cylinder.

3. The ammonium sulfate crystallizer of claim 1, wherein the flushing device comprises a cleaning pipe, and a plurality of cleaning nozzles are arranged at the bottom of the cleaning pipe.

4. The ammonium sulfate crystallizer of claim 1, wherein the bottom of the tank is further provided with a plurality of crystal slurry outlet pipes.

5. The ammonium sulfate crystallizer of claim 1, wherein the recycle liquid nozzle is disposed below the gas ammonia nozzle.

6. The ammonium sulfate crystallizer of claim 1, wherein the caprolactam sulfate nozzles are connected to a caprolactam sulfate pipe by a flange.

7. The ammonium sulfate crystallizer of claim 1, wherein the number of caprolactam sulfate nozzles is 1-5, and the number of liquid outlets on one side of each caprolactam sulfate nozzle is 10-100.