CN218944720U - Waste gas treatment system for phenylacetic acid production - Google Patents
Waste gas treatment system for phenylacetic acid production Download PDFInfo
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- CN218944720U CN218944720U CN202223215937.XU CN202223215937U CN218944720U CN 218944720 U CN218944720 U CN 218944720U CN 202223215937 U CN202223215937 U CN 202223215937U CN 218944720 U CN218944720 U CN 218944720U
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Abstract
The application discloses a phenylacetic acid production exhaust treatment system belongs to tail gas treatment device technical field. A phenylacetic acid production waste gas treatment system comprising: the phenylacetic acid drying unit comprises a first drying body and a second drying body; the outlet of the second drying body is connected with the inlet of the first filter; the outlet of the first filter is connected with the inlet of the first air filtering unit; the outlet of the first air filtering unit is connected with the inlet of the dryer; the outlet of the dryer, the first steam heater and the inlet of the first drying body are sequentially communicated; the outlet of the first drying body is connected with the inlet of the second filter; and the inlet of the waste gas washing device is respectively connected with the outlet of the second filter and the emptying tail gas conveying pipeline. The method can effectively treat waste gas generated in the whole production process of phenylacetic acid, reduce environmental pollution and has lower cost.
Description
Technical Field
The application belongs to tail gas treatment device technical field, concretely relates to phenylacetic acid production exhaust treatment system.
Background
Phenylacetic acid is an important intermediate for fine chemicals such as medicines and fragrances, and in recent years, the market demand for phenylacetic acid has been increasing. At present, products prepared by using a phenylacetic acid production process in industry contain moisture, and are required to be dried, so that a large amount of waste gas is generated in the phenylacetic acid drying process; in addition, some system vent off-gas is also generated during the phenylacetic acid production process. Therefore, the waste gas of the phenylacetic acid production system is mainly divided into two parts, one part is the dry waste gas of the phenylacetic acid product, and the other part is the system exhaust gas.
In the related art, waste gas generated by drying phenylacetic acid is mostly treated by adopting an incineration method, and the problems of high operation cost, poor safety and secondary pollution caused by improper operation exist. In addition, the residual waste gas such as the exhaust tail gas generated in the phenylacetic acid production process is generally treated by an active carbon adsorption method, so that the problems of poor adsorption effect, short service cycle and influence on treatment effect or treatment efficiency exist.
Disclosure of Invention
In view of the above-described problems, the present utility model aims to solve, at least to some extent, one of the technical problems in the related art. Therefore, the utility model provides a phenylacetic acid production waste gas treatment system which can effectively treat waste gas generated in the whole production process of phenylacetic acid, reduce or avoid environmental pollution, and the treated waste gas completely accords with the emission standard, has good safety and high treatment efficiency, and can overcome the defects in the prior art.
In order to solve the technical problems, the application is realized as follows:
as one aspect of the present application, there is provided a phenylacetic acid production waste gas treatment system comprising:
the phenylacetic acid drying unit comprises a first drying body and a second drying body;
the outlet of the second drying body is connected with the inlet of the first filter;
the outlet of the first filter is connected with the inlet of the first air filtering unit;
the outlet of the first air filtering unit is connected with the inlet of the dryer;
the outlet of the dryer is connected with the inlet of the first steam heater, and the outlet of the first steam heater is communicated with the inlet of the first drying body;
the outlet of the first drying body is connected with the inlet of the second filter;
and the outlet of the second filter is connected with the inlet of the waste gas washing device, and the inlet of the waste gas washing device is also connected with an emptying tail gas conveying pipeline so as to input the emptying tail gas generated in phenylacetic acid production into the waste gas washing device through the emptying tail gas conveying pipeline.
Further, the phenylacetic acid drying unit comprises a ebullated-bed dryer, a first drying body in the ebullated-bed dryer comprises a first stage ebullated-bed, and a second drying body in the ebullated-bed dryer comprises a second stage ebullated-bed.
Further, the phenylacetic acid production waste gas treatment system also comprises a second air filtration unit and a second steam heater;
the inlet of the second air filtering unit is connected with a fresh air pipeline, the outlet of the second air filtering unit is connected with the inlet of the second steam heater, and the outlet of the second steam heater is connected with the inlet of the second drying body.
Further, the phenylacetic acid production waste gas treatment system also comprises a first fan and a second fan;
the first fan is arranged on a connecting pipeline between the outlet of the second steam heater and the inlet of the second drying body;
the second fan is arranged on a connecting pipeline between the outlet of the first steam heater and the inlet of the first drying body.
Further, the first filter is a bag filter;
and/or, the second filter is a bag filter.
Further, the dryer is a molecular sieve dryer.
Further, the waste gas washing device comprises a plurality of alkaline washing towers which are connected in series, and each alkaline washing tower is connected with an alkaline liquid pipeline.
Further, the phenylacetic acid production waste gas treatment system also comprises an adsorption device, and the outlet of the waste gas washing device is connected with the inlet of the adsorption device;
the adsorption device comprises at least one adsorption tower, and resin and/or activated carbon are filled in the adsorption tower.
Further, the phenylacetic acid production waste gas treatment system further comprises a tail gas cooling device, wherein the tail gas cooling device is connected with the emptying tail gas conveying pipeline and the waste gas washing device, and the emptying tail gas generated in the phenylacetic acid production is cooled by the tail gas cooling device and then enters the waste gas washing device.
Further, a safety discharge tank is further arranged on the emptying tail gas conveying pipeline, and an outlet of the safety discharge tank is connected with an inlet of the tail gas cooling device;
and/or the vent tail gas conveying pipeline is also provided with a check valve, and vent tail gas generated in phenylacetic acid production enters the tail gas cooling device after passing through the check valve.
The implementation of the technical scheme of the utility model has at least the following beneficial effects:
in this application embodiment, the phenylacetic acid production exhaust treatment system that provides includes phenylacetic acid drying unit, first filter, first air filter unit, the desicator, first steam heater, second filter and exhaust gas washing device etc. adopts phenylacetic acid drying unit to dry the phenylacetic acid product, and phenylacetic acid drying unit includes first dry body and second dry body, and through the connection cooperation setting of devices such as first filter, first air filter unit, the desicator, first steam heater, the second filter, exhaust gas washing device, tail gas that can effectually handle the dry phenylacetic acid in-process produced, reduce or avoid environmental pollution, and the security is good, and simple structure, convenient operation is favorable to reduce cost, avoids the high cost that current burning treatment mode exists, the poor scheduling problem of security. Meanwhile, through the arrangement of the waste gas washing device, the device can be used for treating various exhaust tail gases generated in the phenylacetic acid production process, and the tail gases washed by the waste gas washing device can reach the emission standard, so that the environment pollution can be avoided, the treatment operation process is simplified, the operation is simple, the cost is low, and the efficiency is high.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
FIG. 1 is a schematic diagram of a phenylacetic acid production waste gas treatment system according to some embodiments of the present utility model;
fig. 2 is a schematic diagram of another configuration of a phenylacetic acid production waste gas treatment system in accordance with some embodiments of the present utility model.
Reference numerals illustrate:
a 1-phenylacetic acid drying unit; 110-a first dry body; 120-a second dry body;
2-a first filter; 3-a first air filtration unit; 4-a dryer; 5-a first steam heater;
6-a second filter; 7-an exhaust gas scrubbing device; 8-an adsorption device;
9-a second air filtration unit; 10-a second steam heater;
11-a first fan; 12-a second fan;
210-emptying a tail gas conveying pipeline; 220-a delivery branch; 230-an exhaust cooling device; 240-safety vent.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second, and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," "communicating," etc. are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The embodiments of the present application will be described in detail below with reference to the accompanying drawings by means of specific embodiments and application scenarios thereof.
Referring to fig. 1-2, in some embodiments of the present application, there is provided a phenylacetic acid production waste gas treatment system comprising:
a phenylacetic acid drying unit 1, the phenylacetic acid drying unit 1 including a first drying body 110 and a second drying body 120;
the outlet of the first filter 2 and the second drying body 120 is connected with the inlet of the first filter 2;
a first air filtering unit 3, the outlet of the first filter 2 is connected with the inlet of the first air filtering unit 3;
a dryer 4, the outlet of the first air filtering unit 3 is connected with the inlet of the dryer 4;
the outlet of the dryer 4 is connected with the inlet of the first steam heater 5, and the outlet of the first steam heater 5 is communicated with the inlet of the first drying body 110;
the outlet of the first drying body 110 is connected with the inlet of the second filter 6;
the outlet of the exhaust gas washing device 7 and the outlet of the second filter 6 are connected with the inlet of the exhaust gas washing device 7, and the inlet of the exhaust gas washing device 7 is also connected with an emptying tail gas conveying pipeline 210 so as to input the emptying tail gas generated in the phenylacetic acid production into the exhaust gas washing device 7 through the emptying tail gas conveying pipeline 210.
The phenylacetic acid production waste gas treatment system provided by the embodiment can be applied to the field of phenylacetic acid production, can effectively treat a large amount of tail gas generated in the process of drying phenylacetic acid, and can avoid the problems of high operation cost, inconvenient operation and easy secondary pollution existing in the existing treatment mode; meanwhile, a large amount of tail gas generated in the production process of acetic acid can be effectively treated, so that the content of harmful substances in the treated gas is reduced, the treated gas index completely accords with the emission standard, and the environment is prevented from being polluted; simplifying the processing operation process, and having simple operation and high efficiency.
Specifically, the phenylacetic acid production waste gas treatment system comprises a phenylacetic acid drying unit 1, a first filter 2, a first air filtering unit 3, a dryer 4, a first steam heater 5, a second filter 6 and a waste gas washing device 7, wherein the phenylacetic acid drying unit 1 comprises a first drying body 110 and a second drying body 120, the phenylacetic acid drying unit 1 can adopt a two-stage circulation drying mode, namely, circulation drying can be adopted according to the drying characteristics of the phenylacetic acid product, and thus, at least half of waste gas emission can be reduced. The outlet of the second drying body 120 in the phenylacetic acid drying unit 1 is connected to the inlet of the first filter 2, so that the dried waste gas generated by drying the phenylacetic acid product by the second drying body 120 can enter the first filter 2 for filtration, and thus, at least the phenylacetic acid powder entrained in the tail gas can be intercepted. The outlet of the first filter 2 is connected with the inlet of the first air filtering unit 3, the outlet of the first air filtering unit 3 is connected with the inlet of the dryer 4, the outlet of the dryer 4 is connected with the inlet of the first steam heater 5, and the outlet of the first steam heater 5 is connected with the inlet of the first drying body 110, so that the filtered dry waste gas is subjected to further filtering and drying treatment through the first air filtering unit 3 and the dryer 4, and the treated gas is heated to a certain temperature through the first steam heater 5 and then is sent into the first drying body 110 for drying the phenylacetic acid product. The outlet of the first drying body 110 is connected with the inlet of the second filter 6, and the outlet of the second filter 6 is connected with the inlet of the tail gas washing device, so that the dried waste gas generated by drying the phenylacetic acid product through the first drying body 110 enters the second filter 6 for filtration, at least phenylacetic acid powder carried in the tail gas can be intercepted, the filtered gas is sent into the tail gas washing device for washing treatment, and the washed tail gas can reach the standard and be discharged into the atmosphere.
It will be appreciated that the exhaust gas washing device may be provided with a plurality of inlets, one of which may be adapted to be connected to the outlet of the second filter 6, and another of which may be adapted to be connected to the blowdown exhaust gas delivery pipe 210. By connecting the inlet of the exhaust gas washing device 7 with the exhaust gas delivery pipe 210, the exhaust gas generated in the production of phenylacetic acid can be fed into the exhaust gas washing device 7 through the exhaust gas delivery pipe, and the exhaust gas washing device is used for washing the exhaust gas.
The tail gas washing device not only can be used for washing waste gas generated by drying phenylacetic acid products, but also can be used for washing various discharged tail gases generated in the phenylacetic acid production process.
The source of the above-mentioned tail gas may be a system vent tail gas, a tail gas of a synthesis system and a rectification system, a tail gas or vent air generated from a toluene tower (tank), an acidification buffer tank, an MVR device, etc., and the source of the tail gas is not limited in this embodiment.
Therefore, based on the above settings, the phenylacetic acid production waste gas treatment system of the embodiment can effectively treat the tail gas generated in the process of drying phenylacetic acid, reduce or avoid environmental pollution, has good safety, simple structure and convenient operation, is favorable for reducing cost, and avoids the problems of high cost, poor safety and the like of the existing incineration treatment mode. In addition, the device can be used for treating various exhaust gases generated in the phenylacetic acid production process, and the exhaust gases washed by the exhaust gas washing device 7 can reach the emission standard, so that the device can avoid environmental pollution, simplifies the treatment operation process, and has simple operation, low cost and high efficiency.
In some embodiments, the phenylacetic acid drying unit 1 comprises a ebullated bed dryer, the first drying body 110 in the ebullated bed dryer comprising a first stage ebullated bed, and the second drying body 120 in the ebullated bed dryer comprising a second stage ebullated bed. The ebullated bed dryer may be provided with a two-stage ebullated bed comprising a first stage ebullated bed and a second stage ebullated bed.
In this embodiment, the phenylacetic acid product is dried by a two-stage ebullated-bed dryer, that is, by two-stage circulation drying of heated air under micro-positive pressure, which is mainly based on the circulation drying adopted by the drying characteristics of the phenylacetic acid product, so that at least half of exhaust emission can be reduced, and the exhaust emission can be reduced.
In some embodiments, the first filter 2 is a bag filter; and/or the second filter 6 is a bag filter.
The bag filter is adopted to filter the dried tail gas, so that phenylacetic acid powder carried in the tail gas is intercepted by the bag filter, the cost is reduced, and the tail gas purifying treatment efficiency is improved.
In some embodiments, dryer 4 is a molecular sieve dryer. The molecular sieve dryer can be used for effectively drying the filtered tail gas, and has the advantages of simple structure and convenient use.
In some embodiments, the phenylacetic acid production waste gas treatment system further comprises a second air filtration unit 9 and a second steam heater 10; the inlet of the second air filtering unit 9 is connected with a fresh air pipeline, the outlet of the second air filtering unit 9 is connected with the inlet of the second steam heater 10, and the outlet of the second steam heater 10 is connected with the inlet of the second drying body 120.
In some embodiments, the phenylacetic acid production waste gas treatment system further comprises a first fan 11 and a second fan 12; a first fan 11 is provided on a connection pipe between the outlet of the second steam heater 10 and the inlet of the second drying body 120; a second fan 12 is provided on a connection line of the outlet of the first steam heater 5 and the inlet of the first drying body 110.
Alternatively, both the first air filter unit 3 and the second air filter unit 9 may be air filters.
According to the present embodiment, the phenylacetic acid production waste gas treatment system may include a phenylacetic acid drying unit 1, a first filter 2, a first air filtering unit 3, a second air filtering unit 9, a dryer 4, a first steam heater 5, a second steam heater 10, a second filter 6, a waste gas washing apparatus 7, a first fan 11, and a second fan 12, wherein the phenylacetic acid drying unit 1 includes a first drying body 110 and a second drying body 120. The inlet of the second air filter unit 9 may be connected to a fresh air line to input fresh air into the second air filter unit 9 through the fresh air line; the outlet of the second air filtering unit 9 is connected with the inlet of the second steam heater 10, and the outlet of the second steam heater 10 is connected with the inlet of the second drying body 120, so that fresh air is filtered by the second air filtering unit 9, enters the second steam heater 10 to be heated to a certain temperature, and is input into the second drying body 120 in the phenylacetic acid drying unit 1 through the first fan 11, such as a second section boiling bed, for drying treatment of the phenylacetic acid product.
The outlet of the second drying body 120 in the phenylacetic acid drying unit 1 is connected to the inlet of the first filter 2, so that the dried waste gas generated by drying the phenylacetic acid product by the second drying body 120 can be filtered by entering the first filter 2. The outlet of the first filter 2 is connected with the inlet of the first air filtering unit 3, the outlet of the first air filtering unit 3 is connected with the inlet of a dryer 4 such as a molecular sieve dryer, the outlet of the molecular sieve dryer is connected with the inlet of the first steam heater 5, the outlet of the first steam heater 5 is connected with the inlet of the first drying body 110, the filtered dry waste gas can be subjected to further filtering and drying treatment through the first air filtering unit 3 and the molecular sieve dryer, and the treated gas is heated to a certain temperature through the first steam heater 5 and then is sent into the first drying body 110 through the second fan 12 to dry phenylacetic acid products. The outlet of the first drying body 110 is connected with the inlet of the second filter 6, the outlet of the second filter 6 is connected with the inlet of the tail gas washing device, so that the dried waste gas generated by drying the phenylacetic acid product through the first drying body 110 enters the second filter 6 for filtration, the filtered gas is sent into the tail gas washing device for washing treatment, and the washed tail gas can reach the standard and be discharged into the atmosphere.
In some embodiments, the off-gas scrubber 7 comprises a multi-stage caustic tower comprising a plurality of caustic towers connected in series, each caustic tower having a caustic line connected thereto.
Optionally, the multi-stage caustic wash tower can be a two-stage caustic wash tower, a three-stage caustic wash tower, a four-stage caustic wash tower or more than one-stage caustic wash tower, and the number of the caustic wash towers can be flexibly adjusted according to actual conditions. Preferably, the multi-stage caustic wash tower can be a two-stage caustic wash tower or a three-stage caustic wash tower. The adoption of proper alkaline tower stages or quantity is beneficial to reducing the cost and improving the efficiency on the basis of ensuring the absorption effect, so that the purified tail gas has no pungent smell, and all indexes can meet the environmental-protection emission requirement of the tail gas.
Each alkali washing tower is filled with dilute alkali liquor, namely alkali liquor with lower concentration. The specific type of the alkali liquor can be selected and set according to practical conditions, for example, alkali liquor such as sodium hydroxide solution or potassium hydroxide solution with the concentration of 5-30% by mass percent can be adopted. This embodiment is not limited thereto.
In order to ensure the purification effect of the tail gas and reduce the cost, a two-stage alkaline washing tower is preferably adopted. Specifically, in some embodiments, the multi-stage caustic tower is a two-stage caustic tower comprising a first caustic tower and a second caustic tower; the first alkali wash tower and the second alkali wash tower are respectively connected with a first alkali liquor pipeline and a second alkali liquor pipeline. It is worth noting that the dilute lye in the alkaline tower needs to be replaced and detected periodically to ensure the timeliness of the lye. Wherein, each alkali liquor pipeline can be provided with a delivery pump.
In some embodiments, the phenylacetic acid production waste gas treatment system further comprises an adsorption device 8, and the outlet of the waste gas washing device 7 is connected with the inlet of the adsorption device 8; the adsorption device 8 comprises at least one adsorption tower, and the adsorption tower is filled with resin and/or activated carbon.
Alternatively, the adsorption device 8 may include two adsorption towers, i.e., a first adsorption tower and a second adsorption tower, which may be connected in parallel or in series.
Optionally, the first adsorption tower and the second adsorption tower are filled with adsorbents, and the adsorbents can include one or more of macroporous adsorption resin, ion exchange resin or activated carbon. Illustratively, the adsorbent adopts macroporous adsorption resin, namely the first adsorption tower and the second adsorption tower are filled with macroporous adsorption resin. Alternatively, the adsorbent may be a combination of macroporous adsorbent resin and activated carbon. The macroporous adsorption resin or the ion exchange resin is adopted as the adsorbent, so that the regeneration effect is good, the service cycle is long, and the regenerated waste is easy to treat or can be recycled.
It should be noted that, the outlet of the tail gas washing device is connected with the inlet of the adsorption device 8, and in some cases, the tail gas treated by the tail gas washing device can be directly discharged if it is qualified, that is, the tail gas does not need to be treated by the adsorption device 8. In other cases, if the tail gas treated by the tail gas washing device is not qualified, the adsorption device 8 may be used to perform further adsorption treatment until the tail gas can reach the emission standard.
In some embodiments, the system for treating the waste gas from the phenylacetic acid production further comprises a tail gas cooling device 230, wherein the tail gas cooling device 230 is connected with the blowdown tail gas conveying pipeline 210 and the waste gas washing device 7, and the blowdown tail gas generated in the phenylacetic acid production is cooled by the tail gas cooling device 230 and then enters the waste gas washing device 7.
In some embodiments, the vent exhaust gas conveying pipeline 210 is further provided with a safety vent tank 240, and an outlet of the safety vent tank 240 is connected with an inlet of the exhaust gas cooling device 230; and/or, a check valve is further disposed on the exhaust gas delivery pipeline 210, and exhaust gas generated in phenylacetic acid production enters the exhaust gas cooling device 230 after passing through the check valve.
Optionally, the vent gas delivery pipeline 210 is connected to a plurality of delivery branches 220, for example, the plurality of delivery branches 220 may be used for vent gas of a delivery system, vent gas of a synthesis system and a rectification system, respectively, a toluene raw material intermediate tank, a toluene intermediate tank, a mixing tank, a toluene tower tank, a benzyl alcohol product tank, nitrogen-sealed waste gas of a benzyl chloride storage tank, a toluene layering tank, a process water intermediate tank, a catalyst metering tank, a flash tower, a split-phase tank, a toluene tower, a benzyl alcohol extraction tank, and a product centrifuge mother liquor tank; vacuum venting of batch rectification columns, MVR systems, acidification of acid gases from buffer tanks, and the like.
According to the phenylacetic acid production waste gas treatment system provided by the embodiment, waste gas of the phenylacetic acid production system can be mainly divided into two parts, wherein one part is phenylacetic acid product drying waste gas, the other part is system emptying tail gas, and standard emission is achieved after each waste gas is treated. Wherein, the phenylacetic acid product drying waste gas mainly contains phenylacetic acid product dust and trace acid gas, and can adopt heating air to carry out 2-stage circulation drying under slight positive pressure (mainly adopts circulation drying according to the drying characteristic of the phenylacetic acid product, and can reduce half of waste gas emission). When the phenylacetic acid product drying waste gas is treated, fresh air is filtered by the second air filtering unit 9 at the speed of 6-8m < 3 >/s, then is heated to 70 ℃ by the second steam heater 10, is sent into the second drying body 120 in the product phenylacetic acid drying unit 1 by the first fan 11, such as a second section boiling bed (most of the water in the phenylacetic acid product is removed), the dried tail gas enters the first filter 2, such as a bag filter, and is filtered, then is sent into the first air filtering unit 3 and the dryer 4, such as a molecular sieve dryer, is heated to 80 ℃ by the first steam heater 5 again, is sent into the first drying body 110, such as the first section boiling bed (the water in the phenylacetic acid product is higher), the dried tail gas enters the second filter 6, such as the bag filter, and the filtered tail gas enters the tail gas washing device. The tail gas washing device can adopt 2-section circulation washing (the washing liquid can adopt about 5% of dilute alkali liquor, so that the acid gas and the product dust can be completely trapped), the tail gas after washing is discharged to the atmosphere after reaching standards, and the washing liquid is recycled to other systems for recycling.
The system exhaust gas mainly contains toluene, acid gas, nitrogen, trace carbon monoxide and non-condensable gas, and can be divided into two parts to enter a tail gas treatment system. Wherein, the tail gas of the synthesis system and the rectification system firstly enters a safety discharge tank 240 for decompression and separation, and the gas phase enters a tail gas cooling device 230 again; the nitrogen-sealed waste gas of the toluene raw material intermediate tank, the toluene intermediate tank, the mixing kettle, the toluene tower kettle liquid tank, the benzyl alcohol product tank and the benzyl chloride storage tank passes through a breather valve and then enters the tail gas cooling device 230 through a check valve; the vent air of the toluene layering tank, the process water intermediate tank, the catalyst metering tank, the flash tower, the phase separation tank, the toluene tower, the benzyl alcohol extraction tank and the product centrifuge mother liquor tank enters the tail gas cooling device 230 through a check valve after passing through a normally open manual valve; vacuum venting of the batch rectifying tower and the MVR system is carried out through a normally open manual valve and then enters the tail gas cooling device 230 through a check valve; the acidic gas in the acidification buffer tank has higher temperature and directly enters the tail gas washing device after being cooled. Various tail gases, waste gases and discharged air enter a tail gas cooling device 230 to be subjected to circulating water cooling separation, most of toluene is separated and recovered at the tail gas cooling device, and then the tail gas is continuously sent into a tail gas washing device (a washing liquid is treated by using about 5% of dilute alkali liquor to ensure that acid gases and toluene are cooled and absorbed again) through a fan, and the tail gas at the moment can be continuously treated through an adsorption device 8 if trace toluene is still contained, for example, the tail gas is adsorbed by resin and adsorbed by activated carbon until reaching the emission standards.
The portions of this application not described in detail are known to those skilled in the art.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
Claims (10)
1. A phenylacetic acid production waste gas treatment system, comprising:
the phenylacetic acid drying unit comprises a first drying body and a second drying body;
the outlet of the second drying body is connected with the inlet of the first filter;
the outlet of the first filter is connected with the inlet of the first air filtering unit;
the outlet of the first air filtering unit is connected with the inlet of the dryer;
the outlet of the dryer is connected with the inlet of the first steam heater, and the outlet of the first steam heater is communicated with the inlet of the first drying body;
the outlet of the first drying body is connected with the inlet of the second filter;
and the outlet of the second filter is connected with the inlet of the waste gas washing device, and the inlet of the waste gas washing device is also connected with an emptying tail gas conveying pipeline so as to input the emptying tail gas generated in phenylacetic acid production into the waste gas washing device through the emptying tail gas conveying pipeline.
2. The phenylacetic acid production waste gas treatment system of claim 1, wherein said phenylacetic acid drying unit comprises a ebullated bed dryer, a first drying body in said ebullated bed dryer comprising a first stage ebullated bed, and a second drying body in said ebullated bed dryer comprising a second stage ebullated bed.
3. The phenylacetic acid production waste gas treatment system according to claim 1, wherein said phenylacetic acid production waste gas treatment system further comprises a second air filtration unit and a second steam heater;
the inlet of the second air filtering unit is connected with a fresh air pipeline, the outlet of the second air filtering unit is connected with the inlet of the second steam heater, and the outlet of the second steam heater is connected with the inlet of the second drying body.
4. The phenylacetic acid production waste gas treatment system of claim 3, further comprising a first fan and a second fan;
the first fan is arranged on a connecting pipeline between the outlet of the second steam heater and the inlet of the second drying body;
the second fan is arranged on a connecting pipeline between the outlet of the first steam heater and the inlet of the first drying body.
5. The phenylacetic acid production waste gas treatment system according to claim 1, wherein said first filter is a bag filter;
and/or, the second filter is a bag filter.
6. The phenylacetic acid production waste gas treatment system according to claim 1, wherein said dryer is a molecular sieve dryer.
7. The system for treating waste gas from phenylacetic acid production according to any one of claims 1 to 6, wherein said waste gas washing apparatus comprises a multistage caustic tower comprising a plurality of caustic towers connected in series, and each of said caustic towers is connected with a caustic line.
8. The phenylacetic acid production waste gas treatment system according to any one of claims 1 to 6, further comprising an adsorption device, an outlet of said waste gas washing device being connected to an inlet of said adsorption device;
the adsorption device comprises at least one adsorption tower, and resin and/or activated carbon are filled in the adsorption tower.
9. The phenylacetic acid production waste gas treatment system according to any one of claims 1 to 6, further comprising a waste gas cooling device, wherein said waste gas cooling device is connected to said blowdown waste gas delivery pipe and said waste gas washing device, and blowdown waste gas generated in phenylacetic acid production is cooled by said waste gas cooling device and then enters said waste gas washing device.
10. The phenylacetic acid production waste gas treatment system according to claim 9, wherein a safety bleed tank is further provided on said blowdown tail gas delivery pipe, an outlet of said safety bleed tank being connected to an inlet of said tail gas cooling device;
and/or the vent tail gas conveying pipeline is also provided with a check valve, and vent tail gas generated in phenylacetic acid production enters the tail gas cooling device after passing through the check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223215937.XU CN218944720U (en) | 2022-12-01 | 2022-12-01 | Waste gas treatment system for phenylacetic acid production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223215937.XU CN218944720U (en) | 2022-12-01 | 2022-12-01 | Waste gas treatment system for phenylacetic acid production |
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