CN217988405U

CN217988405U - Butyl acetate recovery system

Info

Publication number: CN217988405U
Application number: CN202222217043.8U
Authority: CN
Inventors: 章成伟; 钟永标; 施红杰
Original assignee: Ningbo Wanglong Tech Co ltd
Current assignee: Ningbo Wanglong Tech Co ltd
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2022-12-09
Anticipated expiration: 2032-08-22

Abstract

The utility model belongs to the technical field of the technique of acetic acid production and specifically relates to a butyl acetate recovery system is related to, it includes the butyl ester basin, the recovery tower, a condenser, receive jar and delayer, the recovery tower is connected with the reboiler through the circulating pipe, be connected with the azeotrope discharging pipe between recovery tower and the condenser, be connected with first connecting pipe between condenser and the receipt jar, be connected with the second connecting pipe between receipt jar and the delayer, the delayer upper end is connected with the butyl ester discharging pipe, be connected with the butyl ester water discharging pipe between lower extreme and the butyl ester basin, still include the heat exchanger, be connected with the butyl ester water inflow pipe between butyl ester basin and the heat exchanger, the butyl ester water inflow pipe is provided with butyl ester water conveyor, be connected with the butyl ester water admission pipe between heat exchanger and the recovery tower middle part, be connected with waste water outflow pipe between recovery tower bottom and the heat exchanger, the heat exchanger still is connected with waste water discharge pipe, the outflow pipe is provided with waste water conveyor. This application has the effect that reduces reboiler steam use amount, reduction energy consumption.

Description

Butyl acetate recovery system

Technical Field

The application relates to the technical field of acetic acid production, in particular to a butyl acetate recovery system.

Background

Since the boiling points of acetic acid and water are close, the azeotropic distillation method is often used in the concentration process of dilute acetic acid to concentrate the dilute acetic acid, butyl acetate and water can form an azeotrope with the boiling point lower than that of water, so butyl acetate is often used as an azeotropic agent to participate in the azeotropic distillation. The azeotrope after rectification is condensed and layered, so that butyl acetate and water can be primarily separated, the separated butyl acetate is recycled, and the water is discharged. However, the water after the primary separation still contains a certain amount of butyl acetate, so that the COD content does not reach the discharge standard, and therefore, the water needs to be separated again through a recovery system.

In the related art, the workflow of the recycling system includes the steps of: feeding the waste water containing butyl acetate into a recovery tower for heating, vaporizing and discharging butyl acetate and part of water from the top of the tower, and performing subsequent secondary separation; the waste water at the bottom of the recovery tower is discharged, and most butyl acetate is vaporized and discharged from the top of the tower, so that the discharged waste water can reach the discharge standard.

According to the related technology, the temperature of the waste water containing butyl acetate is low, and after the waste water enters the recovery tower, the waste water is circularly heated by the reboiler, so that a large amount of steam is consumed, and the energy consumption is high.

SUMMERY OF THE UTILITY MODEL

In order to reduce the steam usage of reboiler, this application provides a butyl acetate recovery system, adopts following technical scheme:

the utility model provides a butyl acetate recovery system, includes butyl ester basin, recovery tower, condenser, receiving jar and delayer, the recovery tower has the reboiler through the circulating pipe connection, be connected with the azeotrope discharging pipe between recovery tower and the condenser, be connected with first connecting pipe between condenser and the receiving jar, be connected with the second connecting pipe between receiving jar and the delayer, the delayer upper end is connected with the butyl ester discharging pipe between butyl ester discharging pipe, lower extreme and the butyl ester basin, still includes the heat exchanger, be connected with the butyl ester water inflow pipe between butyl ester basin and the heat exchanger, the butyl ester water inflow pipe has set gradually butyl ester water inflow valve, butyl ester water conveyor, first control valve subassembly along direction of delivery, be connected with the butyl ester water admission pipe between heat exchanger and the recovery tower middle part, be connected with the efflux pipe between recovery tower bottom and the heat exchanger, the heat exchanger still is connected with the waste water delivery pipe, the waste water outflow pipe has set gradually waste water conveyor, second control valve subassembly along direction of delivery.

By adopting the technical scheme, the butyl ester water enters the heat exchanger through the butyl ester water inflow pipe, the high-temperature wastewater enters the heat exchanger through the wastewater outflow pipe, the high-temperature wastewater and the butyl ester water finish heat exchange in the heat exchanger, the preheated butyl ester water enters the recovery tower through the butyl ester water inflow pipe for rectification, the waste heat of the wastewater can be fully utilized, the steam usage amount of the reboiler is reduced, and the energy consumption is reduced.

Optionally, butyl ester water conveyor connects in parallel and is provided with two at least, butyl ester water conveyor includes and sets gradually first feed valve, butyl ester water charge pump, check valve and the second feed valve on the butyl ester water inflow pipe along direction of delivery, be connected with the evacuation pipe that is located between first feed valve and the butyl ester water charge pump, between check valve and the second feed valve on the butyl ester water inflow pipe, be connected with the blowoff valve on the evacuation pipe.

By adopting the technical scheme, on one hand, the butyl ester water conveying device can be switched to use in the production process, so that the butyl ester water conveying 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 butyl ester water tank needs to be cleaned, residual liquid can be drained out only by closing the second feeding valve and opening the emptying valve.

Optionally, at least two wastewater conveying devices are arranged in parallel.

Through adopting above-mentioned technical scheme, can switch to use waste water conveyor in process of production, be convenient for to waste water conveyor's maintenance and change, improve the fault-tolerant rate, and then guarantee production efficiency.

Optionally, the second connecting pipe is provided with an azeotrope outflow valve and a third control valve assembly in sequence along the conveying direction.

Optionally, an azeotrope return pipe is connected between the second connecting pipe and the recovery tower, and a fourth control valve assembly is arranged on the azeotrope return pipe.

By adopting the technical scheme, when the temperature of the top of the recovery tower is higher, the cooled azeotrope can flow back to the top of the recovery tower through the azeotrope return pipe, so that the temperature of the top of the recovery tower is controlled to be 90-93 ℃, and the recovery concentration of the butyl ester is improved.

Optionally, one end of the butyl ester water discharging pipe close to the delaminating device is connected with a butyl ester water discharging valve, and the butyl ester water discharging pipe is connected with a water level control valve in parallel.

Through adopting above-mentioned technical scheme, when the liquid level was higher in the decker, open the water level control valve, can make the discharge passage of butyl ester water become many, the latus rectum increase, and then reduce the liquid level in the decker, prevent that butyl ester water from flowing out from the butyl ester discharging pipe, improve the recovery concentration of butyl acetate.

Optionally, the condenser is connected with a main emptying pipe, and the main emptying pipe is connected with a main emptying valve.

Through adopting above-mentioned technical scheme, can empty the tail gas in the condenser.

Optionally, a first vent pipe is connected between the main vent pipe and the delayer, a joint of the first vent pipe and the main vent pipe is located between the main vent valve and the condenser, and one end of the first vent pipe, which is close to the delayer, is connected with the first vent valve.

Through adopting above-mentioned technical scheme, can empty the tail gas in the delayer upper end.

Optionally, a second emptying pipe is connected between the receiving tank and the first emptying pipe, one end, close to the receiving tank, of the second emptying pipe is connected with a second emptying valve, a third emptying pipe is connected between the butyl ester water discharging pipe and the first emptying pipe, and a third emptying valve is connected to the third emptying pipe.

Through adopting above-mentioned technical scheme, can empty the tail gas in receiving jar and the delayer lower extreme.

Optionally, a duct mirror is connected to the first connecting pipe.

Through adopting above-mentioned technical scheme, the pipeline condition of first connecting pipe can be observed to the staff, and then judges the cooling effect of azeotrope.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the arrangement of the heat exchanger, the waste water with higher temperature and the butyl ester water with lower temperature can exchange heat in the heat exchanger, thereby reducing the use amount of steam and reducing the energy consumption;

2. by arranging the azeotrope return pipe, the azeotrope returns to the recovery tower for recovery again, so that the recovery concentration of the butyl ester can be improved;

3. by arranging the water level control valve, the liquid level in the delayer can be reduced, and the waste water is prevented from being discharged from the butyl ester discharge pipe;

4. through parallelly connected two at least butyl ester water conveyor and the waste water conveyor that sets up, can switch the use in production to one of them maintains and changes, improves the fault-tolerant rate, ensures production efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a butyl acetate recovery system according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a heat exchanger according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of the butyl ester water tank, the butyl ester water delivery device and the first control valve assembly according to the embodiment of the present application.

Fig. 4 is a schematic structural view of the bottom of a recovery tower, a waste water delivery device and a waste water outflow pipe of a second control valve assembly according to an embodiment of the present application.

Fig. 5 is a schematic structural view at the top of the recovery tower, the condenser, the receiving tank and the delayer in the embodiment of the present application.

Fig. 6 is a schematic diagram of a structure at a delayer according to an embodiment of the present application.

Description of reference numerals: 1. a butyl ester water tank; 2. a recovery tower; 3. a condenser; 4. a receiving tank; 5. a delayer; 6. a circulation pipe; 7. a reboiler; 8. an azeotrope discharge pipe; 9. a first connecting pipe; 10. a second connecting pipe; 11. a butyl ester discharge pipe; 12. a butyl ester water discharging pipe; 13. a heat exchanger; 14. a butyl ester water inflow pipe; 15. a butyl ester water inflow valve; 16. a butyl ester water conveying device; 161. a first feed valve; 162. a butyl ester water feed pump; 163. a check valve; 164. a second feed valve; 165. emptying the pipe; 1651. an evacuation valve; 17. a first control valve assembly; 18. butyl ester water inlet pipe; 19. a waste water outflow pipe; 20. a waste water discharge pipe; 21. a wastewater delivery device; 22. a second control valve assembly; 23. an azeotrope outflow valve; 24. a third control valve assembly; 25. an azeotrope reflux pipe; 26. a fourth control valve assembly; 27. a butyl ester water discharge valve; 28. a water level control valve; 29. a main blow-down pipe; 30. a total emptying valve; 31. a first blow-down pipe; 32. a first vent valve; 33. a second blow-down pipe; 34. a second vent valve; 35. a third blow-down pipe; 36. a third vent valve; 37. a pipe sight glass.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The term "butyl ester water" as used in the examples of the present application means waste water containing butyl acetate.

The embodiment of the application discloses butyl acetate recovery system. Referring to fig. 1 and 2, a butyl acetate recovery system, including a butyl ester water tank 1, a heat exchanger 13, a recovery tower 2, a condenser 3, a receiving tank 4 and a delayer 5, a butyl ester water inflow pipe 14 is connected between the butyl ester water tank 1 and the heat exchanger 13, a butyl ester water inflow pipe 18 is connected between the heat exchanger 13 and the middle part of the recovery tower 2, a waste water outflow pipe 19 is connected between the bottom of the recovery tower 2 and the heat exchanger 13, the heat exchanger 13 is further connected with a waste water discharge pipe 20, the recovery tower 2 is connected with a reboiler 7 through a circulating pipe 6, an azeotrope discharging pipe 8 is connected between the recovery tower 2 and the condenser 3, a first connecting pipe 9 is connected between the condenser 3 and the receiving tank 4, a second connecting pipe 10 is connected between the receiving tank 4 and the delayer 5, a butyl ester discharging pipe 11 is connected to the upper end of the delayer 5, and a butyl ester water discharging pipe 12 is connected between the lower end and the butyl ester water tank 1.

Butyl ester water tank 1 receives waste water containing butyl acetate, butyl ester water conveying device 16 is opened, butyl ester water enters heat exchanger 13 through butyl ester water inflow pipe 14, high-temperature waste water enters heat exchanger 13 through waste water outflow pipe 19, heat exchange between the high-temperature waste water and the butyl ester water is completed in heat exchanger 13, cooled waste water is discharged through waste water discharge pipe 20, preheated butyl ester water enters recovery tower 2 through butyl ester water inflow pipe 18, the waste water is heated by reboiler 7 and then returns to the middle of recovery tower 2 through circulation pipe 6 for rectification recovery, azeotrope of butyl acetate and water obtained through rectification enters condenser 3 through azeotrope discharge pipe 8 for cooling, cooled azeotrope enters receiving tank 4 through first connection pipe 9 and then enters water tank 5 for stratification through second connection pipe 10, butyl acetate with low density is located at the upper layer and is recovered through butyl ester discharge pipe 11, water is located at the lower layer of stratifier 5 and still contains a small amount of butyl acetate, and then flows back to butyl ester 1 through butyl ester water 12 for recovery again.

Referring to fig. 1, the top end of the butyl ester water tank 1 is connected with a tail gas vent pipe, so that tail gas can be exhausted. The recovery tower 2 is provided with a plurality of temperature displays at intervals from top to bottom, so that the temperature of the top of the recovery tower 2 is controlled to be 90-93 ℃, the temperature of the middle section of the tower is greater than 100 ℃, and the temperature of the bottom of the tower is 101 ℃ by workers, further, azeotrope steam is ensured to leave from the top of the tower, and high-temperature wastewater leaves from the bottom of the tower.

Referring to fig. 3, the butyl ester water inflow pipe 14 is sequentially provided with a butyl ester water inflow valve 15, a butyl ester water conveying device 16 and a first control valve assembly 17 along the conveying direction, and at least two butyl ester water conveying devices 16 are arranged in parallel and can be switched to be used in the production process, so that the butyl ester water conveying devices 16 can be maintained and replaced, and the production efficiency is guaranteed. Butyl ester water conveyor 16 includes setting gradually first inlet valve 161, butyl ester water charge pump 162, check valve 163 and second inlet valve 164 on butyl ester water inflow pipe 14 along direction of delivery, is connected with two and is located respectively between first inlet valve 161 and butyl ester water charge pump 162 on the butyl ester water inflow pipe 14, evacuation pipe 165 between check valve 163 and the second inlet valve 164, is connected with exhaust valve 1651 on evacuation pipe 165, when needing to wash butyl ester basin 1 or carry out the pipeline maintenance to the butyl ester inflow pipe, only need close second inlet valve 164 and open exhaust valve 1651, can exhaust the residual liquid.

Referring to fig. 3 and 4, the waste water outflow pipe 19 is sequentially provided with a waste water conveying device 21 and a second control valve assembly 22 along the conveying direction, and at least two waste water conveying devices 21 are arranged in parallel and can be switched to be used in the production process, so that the waste water conveying device 21 can be maintained and replaced, and the production efficiency is guaranteed. The structure of the waste water delivery device 21 is identical to that of the butyl ester water delivery device 16, and therefore, the detailed description thereof is omitted.

Referring to fig. 5, the first connecting pipe 9 is connected with a pipeline viewing mirror 37, and during production, a worker can observe the pipeline condition in the first connecting pipe 9 through the pipeline viewing mirror 37 to judge the cooling effect of the azeotrope. Second connecting pipe 10 has set gradually azeotrope outflow valve 23 and third control valve subassembly 24 along direction of delivery, be connected with azeotrope return pipe 25 between second connecting pipe 10 and the recovery tower 2, be provided with fourth control valve subassembly 26 on azeotrope return pipe 25, when recovery tower 2 top of the tower temperature surpassed 93 ℃, the staff can open fourth control valve subassembly 26, make azeotrope backward flow after the cooling to the recovery tower 2 top of the tower, and then make the top of the tower temperature get back to normal range, reduce the water content in the azeotrope, improve butyl acetate's recovery concentration.

Referring to fig. 1 and 5, the first control valve assembly 17 includes three first control valves connected in series, and a second control valve connected in parallel with the first control valves. Wherein three first control valve is normally opened, when first control valve need maintain with change, opens the second control valve and closes first control valve, and then guarantees production efficiency. The second, third and fourth

control valve assemblies

22, 24 and 26 are all identical in construction to the first control valve assembly 17.

Referring to fig. 6, one end of the butyl ester water discharging pipe 12 close to the delaminating device 5 is connected with a butyl ester water discharging valve 27, and the butyl ester water discharging pipe 12 is connected with a water level control valve 28 in parallel. The butyl ester water with higher density is positioned at the lower layer of the delayer 5, and when the liquid level in the delayer 5 is higher, the water level control valve 28 is opened, so that the liquid level in the delayer 5 can be reduced, and the butyl ester water is prevented from flowing out of the butyl ester discharge pipe 11.

Referring to fig. 5 and 6, the condenser 3 is connected with a total emptying pipe 29, the total emptying pipe 29 is connected with a total emptying valve 30, a first emptying pipe 31 is connected between the total emptying pipe 29 and the delayer 5, the joint of the first emptying pipe 31 and the total emptying pipe 29 is located between the total emptying valve 30 and the condenser 3, one end of the first emptying pipe 31 close to the delayer 5 is connected with a first emptying valve 32, a second emptying pipe 33 is connected between the receiving tank 4 and the first emptying pipe 31, one end of the second emptying pipe 33 close to the receiving tank 4 is connected with a second emptying valve 34, a third emptying pipe 35 is connected between the butyl ester water discharging pipe 12 and the first emptying pipe 31, and a third emptying valve 36 is connected to the third emptying pipe 35. During production, the main emptying valve 30, the first emptying valve 32, the second emptying valve 34 and the third emptying valve 36 are opened to ensure that the tail gas in the condenser 3, the receiving tank 4 and the delayer 5 is emptied.

The implementation principle of the butyl acetate recovery system in the embodiment of the application is as follows: conveying waste water containing butyl acetate into a butyl ester water tank 1, opening a butyl ester water inflow valve 15, a butyl ester water conveying device 16 and a first control valve assembly 17, allowing the butyl ester water to enter a heat exchanger 13 through a butyl ester water inflow pipe 14 to exchange heat with high-temperature waste water flowing through the heat exchanger 13, and allowing the preheated butyl ester water to enter a recovery tower 2 through a butyl ester water inflow pipe 18;

butyl ester water enters a reboiler 7 for heating through a circulating pipe 6, and then returns to the recovery tower 2 through the circulating pipe 6 for rectification recovery, azeotrope of butyl acetate and water obtained by rectification enters a condenser 3 through an azeotrope discharging pipe 8, a wastewater conveying device 21 and a second control valve assembly 22 are opened, high-temperature wastewater obtained by rectification enters a heat exchanger 13 through a wastewater outflow pipe 19 for heat exchange, and cooled wastewater is discharged through a wastewater discharge pipe 20;

the azeotrope cooled in the condenser 3 enters the receiving tank 4 through the first connecting pipe 9, the azeotrope discharge valve and the third control valve assembly 24 are opened, the azeotrope enters the delayer 5 through the second connecting pipe 10 for layering, the butyl acetate with lower density is positioned on the upper layer, flows to the azeotropic tower through the butyl ester discharge pipe 11 to participate in azeotropic distillation, the butyl ester with higher density is positioned on the lower layer, and flows back to the butyl ester water tank 1 through the butyl ester water discharge pipe 12 for recycling again, and the recycled wastewater can reach the discharge standard and is directly discharged;

the recovery tower 2 is provided with a plurality of temperature displays at intervals from top to bottom, when the temperature of the tower top is higher than 93 ℃, the fourth control valve assembly 26 is opened, the cooled azeotrope flows to the tower top of the recovery tower 2 through the azeotrope return pipe 25, so that the temperature of the tower top returns to 90-93 ℃, high-temperature wastewater is prevented from flowing out of the azeotrope discharge pipe 8 at the tower top, and the recovery concentration of butyl acetate is further improved;

the main emptying valve 30, the first emptying valve 32, the second emptying valve 34 and the third emptying valve 36 are normally opened, so that tail gas in the condenser 3, the receiving tank 4 and the delayer 5 can be emptied in time.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, 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

1. The utility model provides a butyl acetate recovery system, includes butyl ester basin (1), recovery tower (2), condenser (3), receives jar (4) and delayer (5), recovery tower (2) are connected with reboiler (7) through circulating pipe (6), be connected with azeotrope discharging pipe (8) between recovery tower (2) and condenser (3), be connected with first connecting pipe (9) between condenser (3) and the receiving tank (4), be connected with second connecting pipe (10) between receiving tank (4) and delayer (5), delayer (5) upper end is connected with butyl ester discharging pipe (11), is connected with butyl ester water discharging pipe (12) between lower extreme and butyl ester basin (1), its characterized in that: still include heat exchanger (13), be connected with butyl ester water inflow pipe (14) between butyl ester basin (1) and heat exchanger (13), butyl ester water inflow pipe (14) have set gradually butyl ester water inflow valve (15), butyl ester water conveyor (16), first control valve subassembly (17) along direction of delivery, be connected with butyl ester water admission pipe (18) between heat exchanger (13) and recovery tower (2) middle part, be connected with waste water outlet pipe (19) between recovery tower (2) bottom and heat exchanger (13), heat exchanger (13) still are connected with waste water discharge pipe (20), waste water outlet pipe (19) have set gradually waste water conveyor (21), second control valve subassembly (22) along direction of delivery.

2. The butyl acetate recovery system of claim 1, wherein: the butyl ester water conveying device (16) is provided with at least two butyl ester water conveying devices in parallel, each butyl ester water conveying device (16) comprises a first feeding valve (161), a butyl ester water feeding pump (162), a check valve (163) and a second feeding valve (164) which are sequentially arranged on a butyl ester water inflow pipe (14) along the conveying direction, an emptying pipe (165) which is located between the first feeding valve (161) and the butyl ester water feeding pump (162) and between the check valve (163) and the second feeding valve (164) is connected onto each butyl ester water inflow pipe (14), and an emptying valve (1651) is connected onto each emptying pipe (165).

3. The butyl acetate recovery system of claim 1, wherein: the waste water conveying devices (21) are connected in parallel and are provided with at least two waste water conveying devices.

4. The butyl acetate recovery system of claim 1, wherein: the second connecting pipe (10) is sequentially provided with an azeotrope outflow valve (23) and a third control valve component (24) along the conveying direction.

5. The butyl acetate recovery system of claim 1, wherein: an azeotrope return pipe (25) is connected between the second connecting pipe (10) and the recovery tower (2), and a fourth control valve assembly (26) is arranged on the azeotrope return pipe (25).

6. The butyl acetate recovery system of claim 1, wherein: one end of the butyl ester water discharging pipe (12) close to the delaminating device (5) is connected with a butyl ester water discharging valve (27), and the butyl ester water discharging pipe (12) is connected with a water level control valve (28) in parallel.

7. The butyl acetate recovery system of claim 1, wherein: the condenser (3) is connected with a main emptying pipe (29), and the main emptying pipe (29) is connected with a main emptying valve (30).

8. The butyl acetate recovery system of claim 7, wherein: be connected with first blow-down pipe (31) between total blow-down pipe (29) and delayer (5), the junction of first blow-down pipe (31) and total blow-down pipe (29) is located between total atmospheric valve (30) and condenser (3), the one end that first blow-down pipe (31) is close to delayer (5) is connected with first atmospheric valve (32).

9. The butyl acetate recovery system of claim 8, wherein: receive and be connected with second blow-down pipe (33) between jar (4) and first blow-down pipe (31), the one end that second blow-down pipe (33) are close to receiving jar (4) is connected with second blow-down valve (34), be connected with third blow-down pipe (35) between butyl ester water discharging pipe (12) and first blow-down pipe (31), be connected with third blow-down valve (36) on third blow-down pipe (35).

10. The butyl acetate recovery system of claim 1, wherein: the first connecting pipe (9) is connected with a pipeline sight glass (37).