CN218166005U - Decoloration system for acetic acid concentration - Google Patents
Decoloration system for acetic acid concentration Download PDFInfo
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- CN218166005U CN218166005U CN202222214048.5U CN202222214048U CN218166005U CN 218166005 U CN218166005 U CN 218166005U CN 202222214048 U CN202222214048 U CN 202222214048U CN 218166005 U CN218166005 U CN 218166005U
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 title claims abstract description 408
- 239000002253 acid Substances 0.000 claims abstract description 155
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 238000010992 reflux Methods 0.000 claims abstract description 33
- 238000007599 discharging Methods 0.000 claims abstract description 17
- 208000021302 gastroesophageal reflux disease Diseases 0.000 claims description 52
- 238000005070 sampling Methods 0.000 claims description 34
- 239000011521 glass Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 22
- 238000000034 method Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 description 14
- 238000012423 maintenance Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010533 azeotropic distillation Methods 0.000 description 2
- 238000004042 decolorization Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model belongs to the technical field of the technique of acetic acid production and specifically relates to a decoloration system is used in acetic acid concentration is related to, it includes the decoloration tower, the condenser, reflux tank and receiving tank, the decoloration tower has the reboiler through circulating pipe connection, the circulating pipe is connected with the residual acid discharging pipe, be provided with acetic acid circulating device on the circulating pipe, be connected with liquid acid admission pipe between condenser and the reflux tank, be connected with finished product acid admission pipe between reflux tank and the receiving tank, the receiving tank is connected with finished product acid discharging pipe, still include the heat exchanger, be connected with the acetic acid discharging pipe between heat exchanger and the decoloration tower, be connected with gaseous state acid admission pipe between heat exchanger and the condenser, be connected with liquid acid inflow pipe between heat exchanger and the reflux tank, the heat exchanger still is connected with dilute acetic acid admission pipe and dilute acetic acid outflow pipe. The heat exchanger is arranged to realize the heat exchange between the concentrated acetic acid steam and the dilute acetic acid, so that the effects of reducing the steam usage amount of the preheater and reducing the energy consumption are achieved.
Description
Technical Field
The application relates to the technical field of acetic acid production, in particular to a decoloring system for acetic acid concentration.
Background
Acetic acid is one of the most important organic acids and one of the important chemical raw materials, is widely applied to industrial production such as organic synthesis, medicines, pesticides, printing and dyeing, foods, adhesives and the like, and has extremely high production value. Therefore, the recovery and concentration increase of dilute acetic acid are important chemical processes.
In the related art, an azeotropic distillation method is often used to recover and concentrate acetic acid, and the obtained concentrated acetic acid is decolorized and subjected to impurity removal to finally obtain the finished product concentrated acetic acid. The technological process includes preheating dilute acetic acid in a preheater with steam, introducing into an azeotropic tower while adding recyclable azeotropic agent, rectifying in the azeotropic tower to obtain concentrated acetic acid, and decolorizing in a decolorizing tower to eliminate impurity.
Aiming at the related technologies, the dilute acetic acid introduced into the azeotropic tower needs steam for preheating, and the preheater consumes a large amount of steam and has high energy consumption.
SUMMERY OF THE UTILITY MODEL
In order to reduce the steam use amount of preheater, this application provides an acetic acid is decoloration system for concentration, adopts following technical scheme:
the utility model provides an acetic acid is decoloration system for concentration, includes decoloration tower, condenser, reflux tank and receiving tank, the decoloration tower has the reboiler through the circulating pipe connection, the circulating pipe connection has the residual acid discharging pipe, be provided with acetic acid circulating device on the circulating pipe, be connected with liquid acid admission pipe between condenser and the reflux tank, be connected with the finished product acid admission pipe between reflux tank and the receiving tank, the receiving tank is connected with the finished product acid discharging pipe, still includes the heat exchanger, be connected with the acetic acid discharging pipe between decoloration tower and the heat exchanger, be connected with gaseous acid admission pipe between heat exchanger and the condenser, be connected with gaseous acid back flow between reflux tank and the gaseous acid admission pipe, be connected with gaseous acid reflux valve on the gaseous acid back flow, be connected with liquid acid inflow pipe between heat exchanger and the reflux tank, the heat exchanger still is connected with dilute acetic acid admission pipe and dilute acetic acid outflow pipe.
By adopting the technical scheme, in work, concentrated acetic acid after decolorization is fed into the heat exchanger through the acetic acid discharge pipe in a gaseous state, dilute acetic acid with lower temperature is fed into the heat exchanger through the dilute acetic acid feed pipe, and concentrated acetic acid steam and dilute acetic acid complete heat exchange in the heat exchanger; on the other hand, part of the concentrated acetic acid steam is cooled into a liquid form and enters the reflux tank through the liquid acid inflow pipe, so that the consumption of condensed water of the condenser can be reduced, and the energy consumption is reduced.
Optionally, the parallelly connected at least two that is provided with of acetic acid circulating device, acetic acid circulating device includes and sets gradually first feed valve, circulating pump, check valve and the second feed valve on the circulating pipe along direction of delivery, be connected with the acetic acid evacuation pipe that is located between first feed valve and the circulating pump on the circulating pipe, acetic acid evacuation union coupling has the acetic acid evacuation valve.
By adopting the technical scheme, on one hand, the acetic acid circulating device can be switched and used in the production process, so that the maintenance and replacement of the acetic acid circulating device are facilitated, the fault tolerance rate is improved, and the production efficiency is further guaranteed; on the other hand, when the decoloring tower needs to be cleaned, residual liquid can be drained only by closing the second feeding valve and opening the acetic acid emptying valve.
Optionally, a finished acid return pipe is connected between the finished acid inlet pipe and the top of the decoloring tower, and the finished acid return pipe is sequentially provided with a finished acid return device and a first control valve assembly along the conveying direction.
By adopting the technical scheme, the finished product concentrated acetic acid enters the top of the decoloring tower through the finished product acid backflow pipe, so that impurities in the decoloring tower can be prevented from rushing to the tower, and the product quality is ensured.
Optionally, the finished acid reflux devices are connected in parallel to be provided with at least two finished acid reflux devices, each finished acid reflux device comprises a first reflux valve and a finished acid reflux pump which are sequentially arranged on the finished acid reflux pipe along the conveying direction, a finished acid emptying pipe located between the first reflux valve and the finished acid reflux pump is connected to the finished acid reflux pipe, and the finished acid emptying pipe is connected with a finished acid emptying valve.
By adopting the technical scheme, on one hand, the finished acid reflux device can be switched and used in the production process, so that the finished acid reflux device is convenient to maintain and replace, the fault tolerance rate is improved, and the production efficiency is further ensured; on the other hand, when the finished product acid backflow pipe needs to be repaired, residual liquid in the pipe can be discharged only by opening the finished product acid emptying valve.
Optionally, be connected with first sampling tube on the finished product acid reflux pipe, first sampling tube is located between finished product acid reflux unit and the first control valve subassembly, first sampling tube is connected with first sampling valve.
Through adopting above-mentioned technical scheme, the staff can take a sample the concentrated acetic acid at decoloration top of the tower through first sample valve, judges whether impurity dashes the tower phenomenon, and then whether the decision is opened finished product acid reflux unit, makes finished product concentrated acetic acid flow back to the decoloration tower.
Optionally, a finished acid reflux valve, a second control valve assembly and a finished acid receiving valve are sequentially arranged on the finished acid inlet pipe along a direction from the reflux tank to the receiving tank, and a joint of the finished acid reflux pipe and the finished acid inlet pipe is located between the finished acid reflux valve and the second control valve assembly.
Through adopting above-mentioned technical scheme, when the sample result of first sample valve was impurity when high on the side in the concentrated acetic acid, closed second control valve subassembly, can make the concentrated acetic acid of finished product in the reflux tank flow into finished product acid reflux pipe, and then flow into the decoloration tower top of the tower, avoid impurity towards the tower.
Optionally, the residual acid discharge pipe is sequentially provided with a residual acid conveying device, a third control valve assembly and a residual acid discharge valve along the conveying direction, and the residual acid conveying device is provided with at least two residual acid conveying devices in parallel.
By adopting the technical scheme, the residual acid conveying device can be switched and used in the production process, the residual acid conveying device is convenient to maintain and replace, the fault tolerance rate is improved, and the production efficiency is further ensured.
Optionally, the liquid acid inlet pipe and the liquid acid inlet pipe are both provided with a pipeline sight glass.
Through adopting above-mentioned technical scheme, can be convenient for the staff observe the liquid acid admission pipe, the pipeline condition of liquid acid inflow pipe and the cooling condition of concentrated acetic acid.
Optionally, the circulating pipe is connected with a second sampling pipe, the second sampling pipe is located between the decoloring tower and the residual acid discharge pipe, and the second sampling pipe is connected with a second sampling valve.
Through adopting above-mentioned technical scheme, through the concentration of sample survey concentrated acetic acid, and then judge whether need open residual acid conveyor and carry out the row sediment.
Optionally, the finished acid discharge pipe is sequentially provided with a finished acid discharge valve, a hose connection and a finished acid conveying device along the conveying direction, and the finished acid conveying device is provided with at least two finished acid conveying devices in parallel.
Through adopting above-mentioned technical scheme, can switch to use finished product acid conveyor in process of production, be convenient for to the maintenance and the change of finished product acid conveyor, improve the fault-tolerant rate, and then guarantee production efficiency.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the heat exchanger is arranged to exchange heat between the concentrated acetic acid steam and the dilute acetic acid, so that the steam usage amount of the preheater can be reduced, and the energy consumption is reduced;
2. at least two acetic acid circulating devices, a finished acid reflux device, a residual acid conveying device and a finished acid conveying device are arranged in parallel, so that the acetic acid circulating devices can be switched and used in production, and the production efficiency is guaranteed;
3. through the arrangement of the finished product acid reflux pipe, the finished product concentrated acetic acid is refluxed to the top of the decoloring tower, and impurities are prevented from rushing the tower.
Drawings
FIG. 1 is a schematic diagram showing the structure of a decoloring system for acetic acid concentration according to an embodiment of the present application.
Fig. 2 is a schematic diagram of the structure at the reboiler in the embodiment of the present application.
Fig. 3 is a schematic structural diagram of a finished acid return pipe according to an embodiment of the present application.
FIG. 4 is a schematic view of the structure of the product acid outlet pipe according to the exemplary embodiment of the present disclosure.
FIG. 5 is a schematic view of the structure of the residual acid discharging pipe according to the embodiment of the present application.
Description of the reference numerals: 1. a bleaching tower; 2. a condenser; 3. a reflux tank; 4. a receiving groove; 5. a circulation pipe; 6. a reboiler; 7. a residual acid discharge pipe; 8. an acetic acid circulation device; 81. a first feed valve; 82. a circulation pump; 83. a check valve; 84. a second feed valve; 85. an acetic acid emptying pipe; 851. an acetic acid purge valve; 9. a liquid acid inlet pipe; 10. finished acid enters the pipe; 11. a finished acid discharge pipe; 12. a heat exchanger; 13. an acetic acid discharging pipe; 14. a gaseous acid inlet pipe; 15. a gaseous acid reflux pipe; 151. a gaseous acid reflux valve; 16. a liquid acid inflow pipe; 17. dilute acetic acid enters the tube; 18. a dilute acetic acid outflow pipe; 19. a finished acid reflux pipe; 20. a finished acid reflux device; 201. a first return valve; 202. a finished acid reflux pump; 203. emptying the finished acid pipe; 2031. a finished acid emptying valve; 21. a first control valve assembly; 22. a first sampling tube; 221. a first sampling valve; 23. a finished acid reflux valve; 24. a second control valve assembly; 25. a finished acid receiving valve; 26. a residual acid delivery device; 27. a third control valve assembly; 28. a residual acid discharge valve; 29. a pipeline sight glass; 30. a second sampling tube; 301. a second sampling valve; 31. a finished acid discharge valve; 32. finished acid conveying device.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a decoloration system for acetic acid concentration. Referring to fig. 1, a decoloring system for acetic acid concentration includes a decoloring tower 1, a heat exchanger 12, a condenser 2, a reflux tank 3 and a receiving tank 4, the bottom side of the decoloring tower 1 is connected with a reboiler 6 through a circulation pipe 5, one end of the circulation pipe 5 near the bottom of the decoloring tower 1 is connected with a residual acid discharge pipe 7, an acetic acid circulation device 8 is arranged on the circulation pipe 5, an acetic acid discharge pipe 13 is connected between the heat exchanger 12 and the top of the decoloring tower 1, a gaseous acid inlet pipe 14 is connected between the heat exchanger 12 and the condenser 2, a liquid acid inlet pipe 16 is connected between the heat exchanger 12 and the reflux tank 3, the heat exchanger 12 is further connected with a dilute acetic acid inlet pipe 17 and a dilute acetic acid outlet pipe 18, a liquid acid inlet pipe 9 is connected between the condenser 2 and the reflux tank 3, a finished acid inlet pipe 10 is connected between the reflux tank 3 and the receiving tank 4, and the receiving tank 4 is connected with a finished acid discharge pipe 11.
Concentrated acetic acid obtained in the previous procedure enters a decoloring tower 1, the concentrated acetic acid is heated by a reboiler 6 and then returns to the decoloring tower 1 for decoloring, the concentrated acetic acid after decoloring enters a heat exchanger 12 in a gas state, dilute acetic acid with a lower temperature enters the heat exchanger 12 through a dilute acetic acid inlet pipe 17, concentrated acetic acid steam and the dilute acetic acid complete heat exchange in the heat exchanger 12, preheated dilute acetic acid flows to an azeotropic tower through a dilute acetic acid outlet pipe 18 for azeotropic rectification, part of the concentrated acetic acid steam is cooled into a liquid state and enters a reflux tank 3, the rest part of the concentrated acetic acid steam keeps the gas state and enters a condenser 2, the concentrated acetic acid steam and the dilute acetic acid steam are cooled into the liquid state and then enter the reflux tank 3 through a liquid acid inlet pipe 9, then enter a receiving tank 4 through a finished acid inlet pipe 10, and finally flow to the next procedure through a finished acid discharging pipe 11.
Referring to fig. 1, a gaseous acid reflux pipe 15 is connected between the gaseous acid inlet pipe 14 and the reflux tank 3, a gaseous acid reflux valve 151 is connected to the gaseous acid reflux pipe 15, in actual production, part of the concentrated acetic acid vapor cannot be completely cooled and enters the reflux tank 3 in a gaseous form, and the gaseous acid reflux valve 151 is opened, so that the concentrated acetic acid vapor in the reflux tank 3 can enter the condenser 2 along the gaseous acid reflux pipe 15 for continuous cooling.
Referring to fig. 1, the liquid acid inlet pipe 9 and the liquid acid inlet pipe 16 are both provided with a pipeline sight glass 29, and during operation, an operator can observe the pipeline conditions of the liquid acid inlet pipe 9 and the liquid acid inlet pipe 16 through the pipeline sight glass 29 to judge the cooling effect of the concentrated acetic acid.
Referring to fig. 2, two acetic acid circulation devices 8 are arranged in parallel, and can be switched to be used during production so as to facilitate maintenance and replacement of one set of acetic acid circulation devices 8. The acetic acid circulation device 8 comprises a first feeding valve 81, a circulation pump 82, a check valve 83 and a second feeding valve 84 which are sequentially arranged on the circulation pipe 5 along the conveying direction, when the acetic acid circulation device 8 in use needs to be maintained or replaced, only the first feeding valve 81 and the second feeding valve 84 of another set of device need to be opened, and then the acetic acid circulation device 8 in use needs to be closed. The circulating pipe 5 is connected with an acetic acid emptying pipe 85 which is arranged between the first feeding valve 81 and the circulating pump 82, the acetic acid emptying pipe 85 is connected with an acetic acid emptying valve 851, and when the decoloring tower 1 needs to be cleaned, the residual liquid in the decoloring tower 1 can be discharged only by opening the acetic acid emptying valve 851 and closing the second feeding valve 84.
Referring to fig. 3, a finished acid return pipe 19 is connected between the finished acid inlet pipe 10 and the decoloring tower 1, and a finished acid return device 20 and a first control valve assembly 21 are sequentially disposed on the finished acid return pipe 19 along the conveying direction. Two finished acid reflux devices 20 are arranged in parallel, and can be switched to be used during production so as to facilitate the maintenance and replacement of one set of finished acid reflux devices 20. The finished acid reflux device 20 comprises a first reflux valve 201 and a finished acid reflux pump 202 which are sequentially arranged on a finished acid reflux pipe 19 along the conveying direction, a finished acid emptying pipe 203 which is arranged between the first reflux valve 201 and the finished acid reflux pump 202 is connected to the finished acid reflux pipe 19, and the finished acid emptying pipe 203 is connected with a finished acid emptying valve 2031. When the finished acid return pipe 19 needs to be repaired, the residual liquid in the pipe can be discharged only by opening the finished acid emptying valve 2031 and closing the first control valve assembly 21.
Referring to fig. 3, the finished acid return pipe 19 is connected to a first sampling pipe 22 located between the finished acid return device 20 and the first control valve assembly 21, the first sampling pipe 22 is connected to a first sampling valve 221, and the first sampling valve 221 is two needle valves, so that a worker can sample the concentrated acetic acid in the finished acid return pipe 19 conveniently. The finished acid return valve 23, the second control valve assembly 24 and the finished acid receiving valve 25 are sequentially arranged on the finished acid inlet pipe 10 along the direction from the return tank 3 to the receiving tank 4, and the connection position of the finished acid return pipe 19 and the finished acid inlet pipe 10 is positioned between the finished acid return valve 23 and the second control valve assembly 24. When the device works, the first control valve assembly 21 and the first sampling valve 221 are opened to sample the concentrated acetic acid flowing into the finished product acid reflux pipe 19 from the decoloring tower 1 and measure the concentration, when the impurities are excessive, the finished product acid reflux device 20 is opened and the second control valve assembly 24 is closed, the finished product concentrated acetic acid in the reflux tank 3 enters the top of the decoloring tower 1 through the finished product acid reflux pipe 19, and the impurities in the tower are prevented from rushing the tower; when the concentration is normal, the first control valve assembly 21 is closed, and concentrated acetic acid is discharged from an acetic acid discharge pipe 13 at the top of the tower.
Referring to fig. 4, the finished acid discharging pipe 11 is sequentially provided with a finished acid discharging valve 31 and a finished acid conveying device 32 along the conveying direction, the number of the finished acid conveying devices 32 is three, and the finished acid conveying devices 32 can be switched for use during production so as to facilitate maintenance and replacement of one set of finished acid conveying device 32, and meanwhile, the finished concentrated acetic acid can be conveyed to different production areas to meet production requirements. The top of the receiving tank 4 is also connected with a breather valve, an exhaust system and a pressure alarm indicator, so that the air pressure in the tank and the outside can be balanced, and the production safety is improved.
Referring to fig. 5, the residual acid discharge pipe 7 is provided with a residual acid delivery device 26, a third control valve assembly 27 and a residual acid discharge valve 28 in sequence along the delivery direction, and two residual acid delivery devices 26 are connected in parallel, so that the residual acid delivery devices can be switched to be used during production to facilitate maintenance and replacement of one set of residual acid delivery device 26. The circulating pipe 5 is connected with a second sampling pipe 30, the second sampling pipe 30 is positioned between the decoloring tower 1 and the residual acid discharging pipe 7, the second sampling pipe 30 is connected with a second sampling valve 301, and the second sampling valve 301 is two needle valves. A plurality of temperature displays are arranged at intervals on the decoloring tower 1, when the temperature of the bottom of the tower reaches about 130 ℃, a worker samples the concentrated acetic acid through the second sampling valve 301 and measures the concentration, and when the impurity content in the concentrated acetic acid sample reaches the standard of slag discharge, the residual acid conveying device 26 and the residual acid discharge valve 28 are opened to discharge the slag.
Referring to fig. 3 and 5, the first control valve assembly 21 includes three first control valves connected in series and one second control valve connected in parallel with the three first control valves. Wherein first control valve is normally opened, when first control valve breaks down, switches the second control valve and opens, guarantees production efficiency. The second control valve assembly 24 and the third control valve assembly 27 are identical in construction to the first control valve assembly 21.
The implementation principle of a decoloration system for acetic acid concentration in the embodiment of the application is as follows: concentrated acetic acid after azeotropic distillation enters a decoloring tower 1, forced circulation is carried out between the decoloring tower 1 and a reboiler 6 under the action of a circulating pump 82, meanwhile, the reboiler 6 heats the passing concentrated acetic acid, and the concentrated acetic acid heated to a certain temperature returns to the decoloring tower 1 for decoloring;
opening a first control valve assembly 21 and a first sampling valve 221, sampling and measuring the concentration of the concentrated acetic acid flowing into a finished product acid return pipe 19 from the decoloring tower 1, and when the impurities are excessive, opening a finished product acid return device 20 and temporarily closing a second control valve assembly 24 to enable the finished product concentrated acetic acid in the return tank 3 to enter the top of the decoloring tower 1 along the finished product acid return pipe 19 so as to prevent the impurities in the decoloring tower 1 from rushing to the tower;
concentrated acetic acid after decolorization enters a heat exchanger 12 through an acetic acid discharge pipe 13 in a gaseous state, dilute acetic acid with lower temperature enters the heat exchanger 12 through a dilute acetic acid inlet pipe 17, concentrated acetic acid steam and dilute acetic acid complete heat exchange in the heat exchanger 12, part of the concentrated acetic acid is cooled into a liquid state and enters a reflux tank 3 through a liquid acid inlet pipe 16, the rest concentrated acetic acid still keeps in a gaseous state and enters a condenser 2 through a gaseous acid inlet pipe 14 for cooling, the heated dilute acetic acid enters an azeotropic tower through a dilute acetic acid outlet pipe 18 to participate in azeotropic rectification, and the steam usage amount of a preheater can be reduced;
after being cooled by the condenser 2, the gaseous concentrated acetic acid enters the reflux tank 3 through the liquid acid inlet pipe 9 in a liquid state, enters the receiving tank 4 through the finished product acid inlet pipe 10 together with the liquid acid flowing into the reflux tank 3 by the heat exchanger 12, and finally enters the next procedure through the finished product acid discharge pipe 11;
when the temperature at the bottom of the tower is about 130 ℃, the concentration of the concentrated acetic acid is measured through the second sampling valve 301, and after the impurity content is confirmed to be high, the residual acid conveying device 26 is opened, so that the residual acid with high impurity content enters the next process through the residual acid discharging pipe 7.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides an acetic acid is decoloration system for concentration, includes decoloration tower (1), condenser (2), backward flow jar (3) and receiving groove (4), decoloration tower (1) is connected with reboiler (6) through circulating pipe (5), circulating pipe (5) are connected with residual acid discharging pipe (7), be provided with acetic acid circulating device (8) on circulating pipe (5), be connected with liquid sour admission pipe (9) between condenser (2) and backward flow jar (3), be connected with finished product acid admission pipe (10) between backward flow jar (3) and receiving groove (4), receiving groove (4) are connected with finished product acid discharging pipe (11), its characterized in that: still include heat exchanger (12), be connected with acetic acid discharging pipe (13) between decoloration tower (1) and heat exchanger (12), be connected with gaseous state acid admission pipe (14) between heat exchanger (12) and condenser (2), be connected with gaseous state acid back flow (15) between reflux drum (3) and gaseous state acid admission pipe (14), be connected with gaseous state acid reflux valve (151) on gaseous state acid back flow (15), be connected with liquid acid inflow pipe (16) between heat exchanger (12) and reflux drum (3), heat exchanger (12) still are connected with dilute acetic acid admission pipe (17) and dilute acetic acid outlet pipe (18).
2. The decoloring system for acetic acid concentration according to claim 1, wherein: the acetic acid circulating device (8) is provided with at least two in parallel, the acetic acid circulating device (8) includes and sets gradually first feed valve (81), circulating pump (82), check valve (83) and second feed valve (84) on circulating pipe (5) along direction of delivery, be connected with acetic acid evacuation pipe (85) that are located between first feed valve (81) and circulating pump (82) on circulating pipe (5), acetic acid evacuation pipe (85) are connected with acetic acid evacuation valve (851).
3. The decoloring system for acetic acid concentration according to claim 1, wherein: a finished acid return pipe (19) is connected between the finished acid inlet pipe (10) and the top of the decoloring tower (1), and a finished acid return device (20) and a first control valve assembly (21) are sequentially arranged on the finished acid return pipe (19) along the conveying direction.
4. The decoloring system for acetic acid concentration according to claim 3, wherein: finished product acid reflux unit (20) are parallelly connected to be provided with two at least, finished product acid reflux unit (20) include along direction of delivery set gradually first return valve (201) and finished product acid reflux pump (202) on finished product acid reflux pipe (19), be connected with finished product acid evacuation pipe (203) that are located between first return valve (201) and finished product acid reflux pump (202) on finished product acid reflux pipe (19), finished product acid evacuation pipe (203) are connected with finished product acid evacuation valve (2031).
5. The decoloring system for acetic acid concentration according to claim 3, wherein: the finished acid reflux pipe (19) is connected with a first sampling pipe (22), the first sampling pipe (22) is positioned between the finished acid reflux device (20) and the first control valve component (21), and the first sampling pipe (22) is connected with a first sampling valve (221).
6. The decoloring system for acetic acid concentration according to claim 3, wherein: the finished acid inlet pipe (10) is sequentially provided with a finished acid reflux valve (23), a second control valve component (24) and a finished acid receiving valve (25) along the direction from the reflux tank (3) to the receiving tank (4), and the joint of the finished acid reflux pipe (19) and the finished acid inlet pipe (10) is positioned between the finished acid reflux valve (23) and the second control valve component (24).
7. The decoloring system for acetic acid concentration according to claim 1, wherein: the residual acid discharge pipe (7) is sequentially provided with a residual acid conveying device (26), a third control valve component (27) and a residual acid discharge valve (28) along the conveying direction, and the residual acid conveying device (26) is provided with at least two in parallel.
8. The decoloring system for acetic acid concentration according to claim 1, wherein: and pipeline sight glasses (29) are arranged on the liquid acid inlet pipe (9) and the liquid acid inflow pipe (16).
9. The decoloring system for acetic acid concentration according to claim 1, wherein: the circulating pipe (5) is connected with a second sampling pipe (30), the second sampling pipe (30) is located between the decoloring tower (1) and the residual acid discharging pipe (7), and the second sampling pipe (30) is connected with a second sampling valve (301).
10. The decoloring system for acetic acid concentration according to claim 1, wherein: the finished acid discharge pipe (11) is sequentially provided with a finished acid discharge valve (31) and a finished acid conveying device (32) along the conveying direction, and the finished acid conveying device (32) is provided with at least two in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222214048.5U CN218166005U (en) | 2022-08-22 | 2022-08-22 | Decoloration system for acetic acid concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222214048.5U CN218166005U (en) | 2022-08-22 | 2022-08-22 | Decoloration system for acetic acid concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218166005U true CN218166005U (en) | 2022-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222214048.5U Active CN218166005U (en) | 2022-08-22 | 2022-08-22 | Decoloration system for acetic acid concentration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218166005U (en) |
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2022
- 2022-08-22 CN CN202222214048.5U patent/CN218166005U/en active Active
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