CN110420476B - System and method for treating tail gas of reaction for preparing benzyl alcohol by toluene liquid-phase air oxidation method - Google Patents
System and method for treating tail gas of reaction for preparing benzyl alcohol by toluene liquid-phase air oxidation method Download PDFInfo
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 title claims abstract description 135
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000007791 liquid phase Substances 0.000 title claims abstract description 31
- 235000019445 benzyl alcohol Nutrition 0.000 title claims abstract description 27
- 230000003647 oxidation Effects 0.000 title claims abstract description 27
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000010521 absorption reaction Methods 0.000 claims abstract description 62
- 239000012071 phase Substances 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000001179 sorption measurement Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims description 41
- 230000008929 regeneration Effects 0.000 claims description 39
- 238000011069 regeneration method Methods 0.000 claims description 39
- 238000011084 recovery Methods 0.000 claims description 30
- 239000012492 regenerant Substances 0.000 claims description 25
- 239000002250 absorbent Substances 0.000 claims description 19
- 230000002745 absorbent Effects 0.000 claims description 19
- 238000004064 recycling Methods 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000003463 adsorbent Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 105
- 230000001105 regulatory effect Effects 0.000 description 14
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 238000000354 decomposition reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005191 phase separation Methods 0.000 description 4
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
A toluene liquid phase air oxidation method benzyl alcohol reaction tail gas treatment system and method, the system includes an initial setting system including at least one condenser and a tail gas condensate collector connected with the condenser; the water washing subsystem comprises at least one water washing tower and a circulating subsystem for continuously supplying washing water to the water washing tower, the circulating subsystem comprises a washing liquid split-phase tank connected with the lower end of the water washing tower, a water phase outlet of the washing liquid split-phase tank is connected with a washing condenser through a circulating pump of the water washing tower, and the washing condenser is connected with the upper end of the water washing tower; the absorption subsystem includes at least one absorption column; the condenser is connected with the lower part of the water washing tower, and the gas phase outlet at the upper part of the water washing tower is connected with the gas phase inlet at the lower part of the absorption tower; the method comprises the steps of cooling, water washing, absorption and adsorption. The invention has the advantages of clean tail gas treatment, reuse and energy consumption reduction.
Description
Technical Field
The invention relates to a treatment system and a treatment method of tail gas, in particular to a treatment system and a treatment method of tail gas from benzyl alcohol preparation by a toluene liquid-phase air oxidation method.
Background
The tail gas of the benzyl alcohol prepared by the toluene liquid phase air oxidation method is high-temperature and high-pressure gas, the conventional treatment mode is to reduce pressure and cool and then to carry out adsorption treatment, the defect is that the treatment time is too long, the high-temperature and high-pressure gas can be treated after being cooled and depressurized for many times, the energy is wasted greatly, and a plurality of links need to maintain higher temperature and gas pressure in the process of preparing the benzyl alcohol by the toluene liquid phase air oxidation method. Through optimizing the treatment system and the treatment steps, the treatment process is quickened, and meanwhile, the tail gas with high temperature and high pressure can be utilized for heating and stabilizing the pressure in each production link of the benzyl alcohol preparation method by the toluene liquid phase air oxidation method.
Disclosure of Invention
The invention provides a reaction tail gas treatment system and a treatment method for preparing benzyl alcohol by a toluene liquid-phase air oxidation method, which can treat the tail gas rapidly, and can realize the recycling of the tail gas and reduce the energy loss to the greatest extent.
The technical scheme for realizing the aim of the invention is that the reaction tail gas treatment system for preparing benzyl alcohol by using toluene liquid phase air oxidation method comprises an initial condensation subsystem, a water washing subsystem and an absorption subsystem:
The initial setting system comprises at least one condenser and a tail gas condensate collector connected with the condenser;
The washing subsystem comprises at least one washing tower and a circulating subsystem for continuously supplying washing water to the washing tower, wherein the circulating subsystem comprises a washing liquid split-phase tank connected with the lower end of the washing tower, a water phase outlet of the washing liquid split-phase tank is connected with a washing condenser through a washing tower circulating pump, and the washing condenser is connected with the upper end of the washing tower;
the absorption subsystem comprises at least one absorption tower;
the condenser is connected with the lower part of the water washing tower, and the gas phase outlet at the upper part of the water washing tower is connected with the gas phase inlet at the lower part of the absorption tower.
Preferably, the absorption subsystem further comprises an absorbent regeneration subsystem, the absorbent regeneration subsystem comprises a regeneration tower, and the lower end of the absorption tower is connected with the regeneration tower through an absorption liquid split-phase tank;
The light phase outlet of the absorption liquid phase-splitting tank is connected with the upper end of the regeneration tower, and the heavy phase outlet is connected with the lower end of the regeneration tower.
Preferably, the absorbent regeneration subsystem further comprises a toluene recovery subsystem, the toluene recovery subsystem comprises a regenerant condenser connected with the upper end of the regeneration tower and a regenerant recovery liquid phase-splitting tank connected with the regenerant condenser, a light phase outlet of the regenerant recovery liquid phase-splitting tank is communicated with the toluene recovery component, and a heavy phase outlet of the regenerant recovery liquid phase-splitting tank is connected with the upper end of the regeneration tower.
Preferably, the absorbent regeneration subsystem further comprises an absorption liquid split-phase tank;
the liquid inlet of the absorption liquid phase-splitting tank is communicated with the heavy phase outlet of the regenerant recovery liquid phase-splitting tank, and the light phase outlet of the absorption liquid phase-splitting tank is connected with the lower end of the regenerant tower.
Preferably, the treatment system further comprises an exhaust gas recirculation subsystem;
the tail gas reflux subsystem comprises at least one flow pressure regulating valve, the flow pressure regulating valve is arranged on a conveying pipe, the conveying pipe conveys tail gas to different production equipment for the benzyl alcohol reaction by a toluene liquid phase air oxidation method with required pressure, and tail gas exhausted by the production equipment is connected with the lower end of the absorption tower.
Preferably, a flow pressure regulating valve is correspondingly arranged for different production equipment.
The method for treating the tail gas of benzyl alcohol by using the toluene liquid-phase air oxidation method comprises the steps of cooling, washing, absorbing and adsorbing;
the cooling, the cooling of the high-temperature tail gas at 170-190 ℃ is carried out by at least one condenser for 50-75 ℃ and the liquid in the tail gas is removed;
The water washing is carried out, and the cooled tail gas is input into a water washing tower for water washing and cooling to 5-15 ℃;
The absorption is carried out, toluene in the tail gas is reacted by using an absorbent, and the pressure is reduced to 250-290Kpa;
the adsorption utilizes an adsorbent to absorb harmful substances in the tail gas;
through the steps, the standard emission of tail gas is realized.
Preferably, the method for treating the tail gas of the benzyl alcohol prepared by the toluene liquid-phase air oxidation method further comprises a tail gas recycling step;
The tail gas is recycled, the high-temperature and high-pressure tail gas enters a cooling step and a water washing step for cooling and is used for maintaining the medium-high pressure production environment of the production link, and when the tail gas is depressurized to 250-290Kpa, the tail gas enters an absorption step and an adsorption step for treatment in sequence.
Preferably, in the tail gas recycling step, after the tail gas is depressurized to 250-290Kpa, the tail gas enters an absorption step and an adsorption step for treatment in sequence.
Preferably, the tail gas recycling process further comprises a partial pressure step, the high-pressure tail gas is conveyed to be regulated by the pressure regulating valve with different amounts to form tail gas with different pressures, and then the tail gas with different pressures is conveyed to production equipment with different pressures.
The invention has the advantages that 1, the treatment of the tail gas is quickened, the tail gas is cooled by cooling and washing for the second time, and is discharged after being treated by absorption and adsorption, compared with the process of re-absorption and adsorption after washing only, the pressure of the tail gas entering the absorption and adsorption links is reduced, and the absorption and adsorption effects are improved, so that the working effect of the whole system is greatly improved.
2. The method solves the problem of tail gas recycling, reduces the temperature and pressure after the tail gas recycling, needs to adopt a single set of treatment system, increases the cost of the whole treatment system, well solves the problem, well embeds the recycled tail gas into the treatment system, and greatly reduces the production cost.
Drawings
FIG. 1 is a schematic diagram of a system for treating tail gas from the liquid-phase air oxidation process for preparing benzyl alcohol from toluene.
FIG. 2 is a schematic diagram of a preferred system for treating tail gas from the liquid-phase air oxidation process for preparing benzyl alcohol from toluene.
FIG. 3 is a block diagram of a method for treating tail gas from the liquid-phase air oxidation process for preparing benzyl alcohol from toluene.
FIG. 4 is a preferred block diagram of a process for treating the tail gas from the liquid phase air oxidation process for preparing benzyl alcohol from toluene.
FIG. 5 is a diagram of an example of recycling tail gas from the process of preparing benzyl alcohol by toluene liquid phase air oxidation.
As shown in the figure, the primary condensing subsystem 1, the water washing subsystem 2, the absorption subsystem 3, the flow pressure regulating valve 4, the condenser 11, the tail gas condensate collector 12, the water washing column 21, the water washing liquid phase separation tank 23, the water washing column circulating pump 24, the water washing condenser 25, the absorption column 31, the regeneration column 32, the absorption liquid phase separation tank 33, the regenerant condenser 34, the regenerant recovery liquid phase separation tank 35, and the toluene recovery unit 36.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
As shown in fig. 1, a treatment system for preparing benzyl alcohol tail gas by toluene liquid phase air oxidation method comprises an initial condensation subsystem 1, a water washing subsystem 2 and an absorption subsystem 3:
The initial setting system 1 comprises two condensers 11 and a tail gas condensate collector 12 connected with the condensers 11;
The water washing subsystem 2 comprises a water washing tower 21 (a plurality of water washing towers 21 can be arranged in parallel or in series) and a circulation part for continuously supplying washing water to the water washing tower 21, wherein the circulation part comprises a washing liquid split-phase tank 23 connected with the lower end of the water washing tower 21, a water phase outlet of the washing liquid split-phase tank 23 is connected with a washing condenser 25 through a water washing tower circulating pump 24, the washing condenser 25 is connected with the upper end of the water washing tower 21, and when the water washing subsystem works, water washed by the water washing tower 21 absorbs harmful gas and harmful substances (mainly toluene and benzene) and then enters the washing liquid split-phase tank 23, water discharged by the washing liquid split-phase tank 23 is pumped into the washing condenser 25 through the water washing tower circulating pump 24 for condensation, and then water containing toluene and benzene is discharged from the washing liquid split-phase tank 23 and collected in a concentrated manner;
The absorption subsystem 3 comprises an absorption tower 31, and preferably, the absorption subsystem 3 further comprises an absorbent regeneration subsystem, wherein the absorbent regeneration subsystem comprises a regeneration tower 32, and the lower end of the absorption tower 31 is connected with the regeneration tower 32 through an absorption liquid phase separation tank 33;
The light phase outlet of the absorption liquid phase-splitting tank 33 is connected with the upper end of the regeneration tower 32, the heavy phase outlet is connected with the lower end of the regeneration tower 32, and when the absorption liquid phase-splitting tank is in operation, the absorption tower 31 absorbs harmful gases passing through the water washing tower 21, the absorbent absorbs harmful substances (mainly toluene and benzene) in the harmful gases, after the absorbent enters the absorption liquid phase-splitting tank 33, the absorbent of the light phase (containing less harmful substances) enters the regeneration tower 32 from the light phase port from the upper end, and the absorbent of the heavy phase (containing more harmful substances) enters the regeneration tower 32 from the heavy phase port from the lower end.
Preferably, the absorbent regeneration subsystem further comprises a toluene recovery subsystem, the toluene recovery subsystem comprises a regenerant condenser 34 connected with the upper end of the regeneration tower 32 and a regenerant recovery liquid phase-splitting tank 35 connected with the regenerant condenser 34, a light phase outlet of the regenerant recovery liquid phase-splitting tank 35 is communicated with the toluene recovery component 36, a heavy phase outlet of the regenerant recovery liquid phase-splitting tank 36 is connected with the upper end of the regeneration tower 32, during operation, gas discharged from the upper end of the regeneration tower 32 enters the regenerant recovery liquid phase-splitting tank 35 after being condensed by the regenerant condenser 34, harmful gas discharged from the light phase outlet enters the toluene recovery component 36, and liquid discharged from the heavy phase outlet is returned to the regeneration tower 32 again.
The condenser 11 is connected with the lower part of the water scrubber 21, and the gas phase outlet at the upper part of the water scrubber 21 is connected with the gas phase inlet at the lower part of the absorption tower 31.
Preferably, the absorbent regeneration subsystem further comprises an absorption liquid split-phase tank;
The liquid inlet of the absorption liquid phase-splitting tank 33 is communicated with the heavy phase outlet of the regenerant recovery liquid phase-splitting tank 35, the liquid discharged from the heavy phase outlet of the regenerant recovery liquid phase-splitting tank 35 can enter the absorption liquid phase-splitting tank 33, the reflux speed of the absorption liquid can be effectively accelerated, the light phase outlet of the absorption liquid phase-splitting tank 33 is connected with the lower end of the regeneration tower 32, and the harmful substances discharged from the absorption liquid phase-splitting tank 33 enter the regeneration tower 32 for regeneration.
As shown in fig. 2, it is preferable to add an exhaust gas recirculation subsystem to the above structure,
The system for treating the tail gas of the benzyl alcohol prepared by the toluene liquid-phase air oxidation method also comprises a tail gas reflux subsystem;
The tail gas reflux subsystem comprises a plurality of flow pressure regulating valves 4, the flow pressure regulating valves 4 are arranged on a conveying pipe, the conveying pipe conveys tail gas to different production devices (such as first production device, second production device and third production device in fig. 2) for preparing benzyl alcohol by a toluene liquid phase air oxidation method with required pressure, the three production devices are respectively and correspondingly provided with the three flow pressure regulating valves 4, each flow pressure regulating valve 4 regulates the gas pressure to a value required by the different production devices, the tail gas exhausted by the production devices is connected with the lower end of the absorption tower, the flow pressure regulating valves 4 regulate the gas pressure and the flow, so that the pressure of the gas can meet the pressure requirement of the different production devices, in the recycling process, the main path is that the tail gas firstly enters the production device with required pressure, then the exhausted tail gas enters the production device with required pressure, and the exhausted tail gas then enters the production device with required pressure, so that the pressure of the tail gas can be utilized to the maximum extent, when the pressure of the path is insufficient, the tail gas is exhausted through the corresponding pressure regulating valves 4 of the respective production devices, and the tail gas is directly exhausted when the pressure of the path is excessively large.
As shown in figure 3, the method for treating the tail gas of the benzyl alcohol preparation reaction by the toluene liquid phase air oxidation method comprises the steps of cooling, water washing, absorption and adsorption;
the cooling is carried out, the temperature of the high-temperature tail gas is 170-190 ℃, the pressure is 1-1.1Mpa, the temperature is reduced by 50-75 ℃ through two condensers, and the liquid in the tail gas is removed. The cooling medium uses 50-degree hot water, the tail gas of 170-190 degree is cooled to about 70 degree after being cooled by hot water, the hot water is heated to 60-70 degree, and meanwhile toluene can be mostly condensed under the pressure of 70 degree and 1.0 MPA;
The water washing is carried out, the cooled tail gas is input into a water washing tower for water washing and cooling to 5-15 ℃ and the pressure is 1-1.1Mpa;
The absorption is carried out, toluene in the tail gas is reacted by using an absorbent, and the pressure is reduced to 250-290Kpa;
the adsorption utilizes an adsorbent to absorb harmful substances in the tail gas;
through the steps, the standard emission of tail gas is realized.
As shown in fig. 4, the method for treating the tail gas of benzyl alcohol by using the toluene liquid phase air oxidation method further comprises a tail gas recycling step;
The method is characterized in that the tail gas is recycled, high-temperature and high-pressure tail gas enters a cooling step and a washing step to be cooled, and preferably, the tail gas recycling process further comprises a partial pressure step, the partial pressure step conveys the high-pressure tail gas to form tail gas with different pressures after being regulated by different quantity pressure regulating valves, then the tail gas with different pressures is conveyed to production equipment with different pressures to be used for maintaining a medium-high pressure production environment of a to-be-produced link, and when the tail gas is depressurized to 250-290Kpa, the tail gas enters an absorption step and is sequentially treated by an adsorption step.
Meanwhile, the production equipment needing to be pressurized is sequentially connected with the production equipment needing to be pressurized, the tail gas flows to the production equipment needing to be pressurized after entering the production equipment needing to be pressurized and is finally discharged, and when the gas pressure is too high, the tail gas of the side production equipment is directly discharged, and the tail gas is sequentially discharged from the production equipment needing to be pressurized to the equipment needing to be pressurized.
In fig. 5, for example, the pre-decomposition tower needs 400Kpa, the decomposition tower 360Kpa and the water washing tower 300Kpa, the tail gas pressure is 1-1.1Mpa, and is adjusted to 400Kpa, 360Kpa and 300Kpa by three different flow pressure adjusting valves 4, the pre-decomposition tower, the decomposition tower and the water washing tower are sequentially connected, the tail gas is discharged after passing through the pre-decomposition tower, the decomposition tower and the water washing tower (mainly using paths), when the tail gas pressure flowing in sequence cannot meet the requirement, the tail gas is directly fed in through the corresponding flow pressure adjusting valve 4, and when the tail gas pressure flowing according to the production is overlarge, the side is directly discharged.
To illustrate the different pressures or temperatures required in the different production steps to facilitate a detailed description of this core innovation
The method has two cores, namely, a reasonable treatment system for preparing benzyl alcohol tail gas by a toluene liquid phase air oxidation method is found through the optimized sequencing of the steps, the parameter requirements are not high, and continuous standard emission can be realized; and secondly, the tail gas is recycled, the pressure and the temperature of the production gas are provided for the production link, and the consumption of energy sources is greatly reduced.
Claims (4)
1. A reaction tail gas treatment system for preparing benzyl alcohol by toluene liquid phase air oxidation method is characterized in that: the treatment system comprises an initial condensation subsystem, a water washing subsystem and an absorption subsystem:
the primary condensation subsystem comprises at least one condenser and a tail gas condensate collector connected with the condenser;
The washing subsystem comprises at least one washing tower and a circulating subsystem for continuously supplying washing water to the washing tower, wherein the circulating subsystem comprises a washing liquid split-phase tank connected with the lower end of the washing tower, a water phase outlet of the washing liquid split-phase tank is connected with a washing condenser through a washing tower circulating pump, and the washing condenser is connected with the upper end of the washing tower;
the absorption subsystem comprises at least one absorption tower;
the condenser is connected with the lower part of the water washing tower, and the gas phase outlet at the upper part of the water washing tower is connected with the gas phase inlet at the lower part of the absorption tower;
the absorption subsystem further comprises an absorbent regeneration subsystem, the absorbent regeneration subsystem comprises a regeneration tower, and the lower end of the regeneration tower is connected with the regeneration tower through an absorption liquid split-phase tank;
The light phase outlet of the absorption liquid phase-splitting tank is connected with the upper end of the regeneration tower, and the heavy phase outlet is connected with the lower end of the regeneration tower;
the treatment system also comprises a tail gas reflux subsystem;
The tail gas reflux subsystem comprises a pressure stabilizing box and a recovery box, the conveying pipe conveys gas in the pressure stabilizing box to each production part requiring pressure, the recovery box recovers the depressurization gas of each production part through the recovery pipe, and the recovery box is connected with the lower end of the absorption tower;
The absorbent regeneration subsystem also comprises a toluene recovery subsystem, wherein the toluene recovery subsystem comprises a regenerant condenser connected with the upper end of the regeneration tower and a regenerant recovery liquid split-phase tank connected with the regenerant condenser, a light phase outlet of the regenerant recovery liquid split-phase tank is communicated with a toluene recovery component, and a heavy phase outlet of the regenerant recovery liquid split-phase tank is connected with the upper end of the regeneration tower.
2. The reaction tail gas treatment system for preparing benzyl alcohol by using toluene liquid phase air oxidation method as set forth in claim 1, wherein: the absorbent regeneration subsystem also comprises an absorption liquid split-phase tank;
the liquid inlet of the absorption liquid phase-splitting tank is communicated with the heavy phase outlet of the regenerant recovery liquid phase-splitting tank, and the light phase outlet of the absorption liquid phase-splitting tank is connected with the lower end of the regenerant tower.
3. The method for treating the tail gas treatment system for the benzyl alcohol preparation reaction by the toluene liquid phase air oxidation method according to any one of claims 1 to 2, which is characterized in that: the method comprises the steps of cooling, water washing, absorption and adsorption;
the cooling, the cooling of the high-temperature tail gas at 170-190 ℃ is carried out by at least one condenser for 50-75 ℃ and the liquid in the tail gas is removed;
The water washing is carried out, and the cooled tail gas is input into a water washing tower for water washing and cooling to 5-15 ℃;
the absorption is carried out, and the toluene in the tail gas is absorbed by an absorbent and is depressurized to 250-290Kpa;
the adsorption utilizes an adsorbent to absorb harmful substances in the tail gas;
Through the steps, the standard emission of tail gas is realized;
the method also comprises a tail gas recycling step;
the tail gas is recycled, the high-temperature and high-pressure tail gas enters a cooling step and is directly returned to the production process of benzyl alcohol by a toluene liquid-phase air oxidation method, the tail gas is used for maintaining the medium-high pressure production environment of a production link, and when the tail gas is depressurized to 250-290Kpa, the tail gas enters an absorption step and an adsorption step for treatment in sequence.
4. A process according to claim 3, characterized in that: in the tail gas recycling step, after the tail gas is depressurized to 250-290Kpa, the tail gas is pre-cooled, and then enters an absorption step and an adsorption step for treatment in sequence.
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| CN106606917A (en) * | 2015-10-22 | 2017-05-03 | 中国石油化工股份有限公司 | Method and apparatus for f toluene oxidation tail gas treatment |
| CN109806713A (en) * | 2019-01-22 | 2019-05-28 | 河北泰帆环保工程有限公司 | A kind of toluene waste gas processing method |
| CN210612931U (en) * | 2019-08-08 | 2020-05-26 | 湖北科林博伦新材料有限公司 | Toluene liquid-phase air oxidation method benzyl alcohol preparation reaction tail gas treatment system |
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