CN210612931U - Toluene liquid-phase air oxidation method benzyl alcohol preparation reaction tail gas treatment system - Google Patents
Toluene liquid-phase air oxidation method benzyl alcohol preparation reaction tail gas treatment system Download PDFInfo
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- CN210612931U CN210612931U CN201921280410.0U CN201921280410U CN210612931U CN 210612931 U CN210612931 U CN 210612931U CN 201921280410 U CN201921280410 U CN 201921280410U CN 210612931 U CN210612931 U CN 210612931U
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 title claims abstract description 126
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 239000007791 liquid phase Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 34
- 235000019445 benzyl alcohol Nutrition 0.000 title claims abstract description 26
- 230000003647 oxidation Effects 0.000 title claims abstract description 26
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 79
- 238000010521 absorption reaction Methods 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 43
- 239000012071 phase Substances 0.000 claims abstract description 37
- 238000009833 condensation Methods 0.000 claims abstract description 9
- 230000005494 condensation Effects 0.000 claims abstract description 9
- 230000008929 regeneration Effects 0.000 claims description 40
- 238000011069 regeneration method Methods 0.000 claims description 40
- 238000004519 manufacturing process Methods 0.000 claims description 33
- 238000011084 recovery Methods 0.000 claims description 26
- 239000012492 regenerant Substances 0.000 claims description 23
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 239000002250 absorbent Substances 0.000 claims description 18
- 230000002745 absorbent Effects 0.000 claims description 18
- 238000005191 phase separation Methods 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
A toluene liquid phase air oxidation method benzyl alcohol preparation reaction tail gas processing system, the initial condensation subsystem includes at least one condenser and tail gas condensate collector connected with said 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 phase-splitting tank connected with the lower end of the water washing tower, a water phase outlet of the washing liquid phase-splitting tank is connected with a water washing condenser through a circulating pump of the water washing tower, and the water washing condenser is connected with the upper end of the water 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 a gas phase outlet at the upper part of the water washing tower is connected with a gas phase inlet at the lower part of the absorption tower. The utility model has the advantages that, the reuse of tail gas can be realized, and the loss of the energy source is reduced to the utmost extent.
Description
Technical Field
The patent of the utility model relates to a processing system and processing method of tail gas, concretely relates to processing system and processing method of toluene liquid phase air oxidation system benzyl alcohol tail gas.
Background
The tail gas from the preparation of the benzyl alcohol by the toluene liquid-phase air oxidation method is high-temperature and high-pressure gas, the conventional treatment method is generally to carry out adsorption treatment after depressurization and cooling, and the defects are that the treatment time is too long, in addition, the high-temperature and high-pressure gas can be treated after repeated cooling and depressurization, the energy is greatly wasted, and meanwhile, many links in the preparation of the benzyl alcohol by the toluene liquid-phase air oxidation method need to maintain higher temperature and gas pressure. By optimizing the treatment system and the treatment steps, the treatment process is accelerated, and meanwhile, the effects of heating and stabilizing the pressure of each production link of preparing the benzyl alcohol by the toluene liquid-phase air oxidation method can be realized by utilizing the high-temperature and high-pressure tail gas.
SUMMERY OF THE UTILITY MODEL
The utility model provides a can handle toluene liquid phase air oxidation method system benzyl alcohol reaction tail gas processing system and processing method sooner, can realize the retrieval and utilization of tail gas, the loss of furthest's reduction energy simultaneously.
Realize the utility model discloses technical scheme on purpose is, a toluene liquid phase air oxidation method system benzyl alcohol reaction tail gas processing system includes initial condensation subsystem, washing subsystem, absorption subsystem:
the initial 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, the circulating subsystem comprises a washing liquid phase-separating tank connected with the lower end of the washing tower, a water phase outlet of the washing liquid phase-separating 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 a gas phase outlet at the upper part of the water washing tower is connected with a 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 phase separation 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-separating tank connected with the regenerant condenser, a light phase outlet of the regenerant recovery liquid phase-separating tank is communicated with the toluene recovery part, and a heavy phase outlet of the regenerant recovery liquid phase-separating tank is connected with the upper end of the regeneration tower.
Preferably, the absorbent regeneration subsystem further comprises an absorption liquid phase separation 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 regeneration tower.
Preferably, the treatment system further comprises a tail gas reflux 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 preparing benzyl alcohol by a toluene liquid-phase air oxidation method with required pressure, and the tail gas discharged by the production equipment is connected with the lower end of the absorption tower.
Preferably, a flow pressure regulating valve is correspondingly arranged on different production equipment.
The utility model has the advantages that, 1, accelerated the processing of tail gas, through cooling, washing secondary cooling, discharge again after absorbing and adsorbing and handling again, its process relative ratio is reabsorbed, absorption after pure washing, has reduced the atmospheric pressure that gets into absorption, absorption link, has improved absorption, absorbent effect to make entire system's working effect improve by a wide margin.
2. The difficult problem of tail gas retrieval and utilization has been solved, and preceding tail gas retrieval and utilization back temperature reduces, pressure reduction need adopt one set of solitary processing system, has increased whole processing system's cost the utility model discloses in, this problem of fine solution, in the fine embedding processing system of tail gas treatment with the retrieval and utilization, reduced manufacturing cost by a wide margin.
Drawings
FIG. 1 is a schematic view of a treatment system for preparing benzyl alcohol tail gas by a toluene liquid-phase air oxidation method.
FIG. 2 is a schematic view of a preferred processing system for preparing benzyl alcohol tail gas by a toluene liquid-phase air oxidation method.
FIG. 3 is a block diagram of a treatment method of tail gas from the preparation of benzyl alcohol by a toluene liquid-phase air oxidation method.
FIG. 4 is a preferred block diagram of a treatment method of tail gas from the preparation of benzyl alcohol by a toluene liquid-phase air oxidation method.
As shown in the figure, the system comprises an initial condensation subsystem 1, a water washing subsystem 2, an absorption subsystem 3, a flow pressure regulating valve 4, a condenser 11, an exhaust condensate collector 12, a water washing tower 21, a water washing liquid phase separation tank 23, a water washing tower circulating pump 24, a water washing condenser 25, an absorption tower 31, a regeneration tower 32, an absorption liquid phase separation tank 33, a regenerant condenser 34, a regenerant recovery liquid phase separation tank 35 and a toluene recovery part 36.
Detailed Description
As shown in fig. 1, a processing system for preparing benzyl alcohol tail gas by a toluene liquid-phase air oxidation method comprises a primary condensation subsystem 1, a water washing subsystem 2 and an absorption subsystem 3:
the primary condensation subsystem 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 circulating component for continuously supplying washing water to the water washing tower 21, the circulating component comprises a washing liquid phase-separating tank 23 connected with the lower end of the water washing tower 21, the water phase outlet of the washing liquid phase-separating tank 23 is connected with a washing condenser 25 through a washing tower circulating pump 24, the washing condenser 25 is connected with the upper end of the water washing tower 21, when the water washing subsystem works, the water of the washing gas of the water washing tower 21 absorbs harmful substances (mainly toluene and benzene) of harmful gas and then enters the water washing liquid phase-separating tank 23, the water discharged from the washing liquid phase-separating tank 23 is pumped into the washing condenser 25 through the washing tower circulating pump 24 for condensation and then is sprayed from the upper end of the water washing tower 21, and the toluene and benzene-containing liquid discharged from the water phase-separating tank 23 is collected in a centralized manner;
the light phase outlet of the absorption liquid phase-separating 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, when the absorption tower 31 absorbs harmful gas passing through the water washing tower 21 during operation, the absorbent absorbs harmful substances (mainly toluene and benzene) in the harmful gas, after the absorbent enters the absorption liquid phase-separating tank 33, the absorbent (containing less harmful substances) of the light phase enters the regeneration tower 32 from the upper end through the light phase port, and the absorbent (containing more harmful substances) of the heavy phase enters the regeneration tower 32 from the lower end through the heavy phase port.
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-separating tank 35 connected with the regenerant condenser 34, a light phase outlet of the regenerant recovery liquid phase-separating tank 35 is communicated with a toluene recovery part 36, a heavy phase outlet of the regenerant recovery liquid phase-separating tank 36 is connected with the upper end of the regeneration tower 32, when the system works, gas discharged from the upper end of the regeneration tower 32 is condensed by the regenerant condenser 34 and then enters the regenerant recovery liquid phase-separating tank 35, harmful gas discharged from the light phase outlet enters the toluene recovery part 36, and liquid discharged from the heavy phase outlet returns to the regeneration tower 32 again.
The condenser 11 is connected with the lower part of the water washing tower 21, and the gas phase outlet at the upper part of the water washing tower 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 phase separation tank;
absorption liquid phase-splitting tank 33 inlet with regenerant recovery liquid phase-splitting tank 35 heavy phase export intercommunication, regenerant recovery liquid phase-splitting tank 35 heavy phase export exhaust liquid can get into absorption liquid phase-splitting tank 33, can effectively accelerate the speed of refluxing of absorption liquid, absorption liquid phase-splitting tank 33 light phase export is connected with regeneration tower 32 lower extreme, absorption liquid phase-splitting tank 33 exhaust harmful substance gets into regeneration tower 32 and regenerates.
As shown in fig. 2, preferably, an exhaust gas recirculation subsystem is added to the above structure,
the treatment system for preparing the benzyl alcohol tail gas 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 equipment (such as a first production equipment, a second production equipment and a third production equipment in figure 2, the three production equipment are respectively and correspondingly provided with three flow pressure regulating valves 4, each flow pressure regulating valve 4 enables the gas pressure to be regulated to the pressure value required by the different production equipment), the tail gas discharged by the production equipment is connected with the lower end of the absorption tower, the flow pressure regulating valves 4 regulate the gas pressure and the flow, the pressure of the gas can meet the pressure requirements of the different production equipment, in the recycling process, the main path is that the tail gas firstly enters the production equipment with high pressure requirement and then enters the production equipment with medium pressure requirement, the exhaust tail gas enters the production equipment which needs to be pressed down, 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 directly supplemented through the flow pressure regulating valves 4 corresponding to the production equipment, and when the pressure of the path is too large, the exhaust tail gas of the production equipment is directly discharged.
As shown in fig. 3, a method for treating tail gas from a reaction of preparing benzyl alcohol by a toluene liquid-phase air oxidation method comprises cooling, washing, absorbing, and adsorbing;
the cooling is carried out, wherein 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 is hot water of 50 ℃, the tail gas of 170-190 ℃ is cooled by the hot water and then cooled to about 70 ℃, the hot water is heated to 60-70 ℃, and meanwhile, the toluene can be mostly condensed at 70 ℃ under the pressure of 1.0 MPA;
the washing step, the cooled tail gas is input into a washing tower to be washed and cooled to 5-15 ℃ and the pressure is 1-1.1 Mpa;
the absorption comprises the steps of reacting toluene in tail gas by using an absorbent, and reducing the pressure to 250-290Kpa;
the adsorption is to utilize an adsorbent to absorb harmful substances in the tail gas;
through the steps, the tail gas is discharged after reaching the standard.
As shown in fig. 4, the method for treating tail gas from the preparation of benzyl alcohol by the toluene liquid-phase air oxidation method further comprises a tail gas recycling step;
after the high-temperature and high-pressure tail gas enters the cooling step and the washing step to be cooled, preferably, the tail gas recycling process further comprises a partial pressure step, wherein the partial pressure step is to convey the high-pressure tail gas to be regulated by different pressure regulating valves to form tail gas with different pressures, then the tail gas with different pressures is conveyed to production equipment needing different pressures to be used for maintaining the medium-high pressure production environment in the production link, and when the pressure of the tail gas is reduced to 250-290Kpa, the tail gas enters the absorption step and the absorption step to be sequentially treated.
Meanwhile, the production equipment with high pressure demand is connected with the production equipment with low pressure demand in sequence, tail gas flows to the production equipment with low pressure demand from the production equipment with high pressure demand and is discharged finally, when the gas pressure is overlarge, the tail gas of the side production equipment is directly discharged, and the tail gas is sequentially discharged from the production equipment with high pressure demand to the equipment with low pressure demand.
For example, the pressure of a predecomposition tower is 400Kpa, the pressure of a decomposition tower is 360Kpa and the pressure of a water washing tower is 300Kpa, the pressure of tail gas is 1-1.1Mpa, the pressure of the tail gas is regulated to 400Kpa, 360Kpa and 300Kpa through three different flow rate pressure regulating valves 4, the predecomposition tower, the decomposition tower and the water washing tower are sequentially connected, the tail gas is discharged (mainly used route) after passing through the predecomposition tower, the decomposition tower and the water washing tower, when the pressure of the sequentially flowing tail gas cannot meet the requirement, the tail gas is directly supplemented through the corresponding flow rate pressure regulating valves 4, and when the pressure of the sequentially flowing tail gas is overlarge, the tail gas is directly discharged laterally.
To illustrate which different pressures or temperatures are required in the different production steps in order to elaborate on this core innovation
The utility model has two cores, firstly, a reasonable treatment system for preparing the benzyl alcohol tail gas by the toluene liquid-phase air oxidation method is found through the optimal sequencing of the steps, the requirement on parameters is not high, and the continuous standard discharge 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 energy consumption is greatly reduced.
Claims (6)
1. The utility model provides a toluene liquid phase air oxidation method benzyl alcohol system reaction tail gas processing system which characterized in that: the treatment system comprises an initial condensation subsystem, a water washing subsystem and an absorption subsystem:
the initial 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, the circulating subsystem comprises a washing liquid phase-separating tank connected with the lower end of the washing tower, a water phase outlet of the washing liquid phase-separating 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 a gas phase outlet at the upper part of the water washing tower is connected with a gas phase inlet at the lower part of the absorption tower.
2. The system for treating the reaction tail gas generated in the preparation of the benzyl alcohol by the toluene liquid-phase air oxidation method according to claim 1, which is characterized in that: the absorption subsystem also 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 phase separation 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.
3. The system for treating the reaction tail gas generated in the preparation of the benzyl alcohol by the toluene liquid-phase air oxidation method according to claim 2, which is characterized in that: the absorbent regeneration subsystem also 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, the light phase outlet of the regenerant recovery liquid phase-splitting tank is communicated with the toluene recovery part, and the heavy phase outlet of the regenerant recovery liquid phase-splitting tank is connected with the upper end of the regeneration tower.
4. The system for treating the reaction tail gas generated in the preparation of the benzyl alcohol by the toluene liquid-phase air oxidation method according to claim 2, which is characterized in that: the absorbent regeneration subsystem also comprises an absorption liquid phase separation 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 regeneration tower.
5. The system for treating the reaction tail gas generated in the preparation of benzyl alcohol by the toluene liquid-phase air oxidation method according to claim 1, which is characterized in that: the treatment system also comprises a tail gas reflux 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 preparing benzyl alcohol by a toluene liquid-phase air oxidation method with required pressure, and the tail gas discharged by the production equipment is connected with the lower end of the absorption tower.
6. The system for treating the reaction tail gas generated in the preparation of the benzyl alcohol by the toluene liquid-phase air oxidation method according to claim 5, which is characterized in that: and a flow pressure regulating valve is correspondingly arranged on different production equipment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921280410.0U CN210612931U (en) | 2019-08-08 | 2019-08-08 | Toluene liquid-phase air oxidation method benzyl alcohol preparation reaction tail gas treatment system |
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| CN201921280410.0U CN210612931U (en) | 2019-08-08 | 2019-08-08 | Toluene liquid-phase air oxidation method benzyl alcohol preparation reaction tail gas treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110420476A (en) * | 2019-08-08 | 2019-11-08 | 湖北科林博伦新材料有限公司 | A kind of toluene liquid-phase air oxidation legal system benzyl alcohol reaction end gas processing system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110420476A (en) * | 2019-08-08 | 2019-11-08 | 湖北科林博伦新材料有限公司 | A kind of toluene liquid-phase air oxidation legal system benzyl alcohol reaction end gas processing system and method |
| CN110420476B (en) * | 2019-08-08 | 2024-06-25 | 湖北科林博伦新材料有限公司 | System and method for treating tail gas of reaction for preparing benzyl alcohol by toluene liquid-phase air oxidation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A tail gas treatment system for toluene liquid-phase air oxidation of benzyl alcohol reaction Effective date of registration: 20231227 Granted publication date: 20200526 Pledgee: Agricultural Bank of China Limited Zhijiang sub branch Pledgor: HUBEI KELIN BOLUN NEW MATERIAL CO.,LTD. Registration number: Y2023980074318 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |