CN213537769U - Sewage system of acrolein continuous production 1, 3-propylene glycol technology - Google Patents
Sewage system of acrolein continuous production 1, 3-propylene glycol technology Download PDFInfo
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- CN213537769U CN213537769U CN202022618137.7U CN202022618137U CN213537769U CN 213537769 U CN213537769 U CN 213537769U CN 202022618137 U CN202022618137 U CN 202022618137U CN 213537769 U CN213537769 U CN 213537769U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
A blowdown system of a process for continuously producing 1, 3-propylene glycol by acrolein relates to the technical field of chemical equipment and comprises a hydration reactor, wherein the acrolein and water are connected with the hydration reactor through a pipeline, the hydration reactor is sequentially connected with an aldehyde recovery tower, a hydrogenation reaction device, a high-low component tank, a dealcoholization tower, a water recovery device, a heavy component dealcoholization tower, a product tower and a dealdehydization tower through pipelines, the aldehyde recovery tower is connected with a waste gas recovery tower, the hydrogenation reaction device is connected with a catalyst solid recovery tank, the high-low component tank and the dealcoholization tower are respectively connected with the waste gas recovery tower, the dealcoholization tower is connected with an alcohol-containing waste liquid treatment tank, the heavy component dealcoholization tower is respectively connected with the waste gas recovery tower and a heavy component treatment tank, the product tower is respectively connected with the waste gas recovery tower and an oligomer recovery tank, and the dealdehydization tower is connected with a PDO-. The sewage discharge system of the process for continuously producing the 1, 3-propylene glycol by the acrolein is provided with a sewage discharge point, so that the purity of the 1, 3-propylene glycol product is improved.
Description
The technical field is as follows:
the utility model relates to a chemical industry equipment technical field, concretely relates to sewage system of acrolein continuous production 1, 3-propylene glycol technology.
Background art:
at present, in the process of producing 1, 3-propenol by acrolein, the exhaust spots are few, so that a lot of waste gas and waste gas are not discharged and are mixed in the device all the time, so that each device has incomplete reaction and incomplete separation, impurities are mixed in the 1, 3-propenol product, and the purity of the 1, 3-propenol product is reduced.
The utility model has the following contents:
the utility model aims at overcoming the shortcomings of the prior art, providing a sewage system for continuously producing 1, 3-propylene glycol by acrolein, which has a plurality of sewage discharge points, ensures complete separation of reaction in each device and improves the purity of 1, 3-propylene alcohol products.
In order to solve the problem existing in the background art, the utility model adopts the following technical scheme: the device comprises a hydration reactor, an aldehyde recovery tower and a hydrogenation reaction device, acrolein and water are connected with the hydration reactor through a pipeline, the hydration reactor is sequentially connected with the aldehyde recovery tower through a pipeline, the hydrogenation reaction device, a high-low component tank, a dealcoholization tower, a water recovery device, a heavy component dealcoholization tower, a product tower and a dealcoholization decomposition tower, the aldehyde recovery tower is connected with a waste gas recovery tower through a pipeline, the hydrogenation reaction device is connected with a catalyst solid recovery tank through a pipeline, the high-low component tank and the dealcoholization tower are respectively connected with the waste gas recovery tower through pipelines, the dealcoholization tower is also connected with an alcohol-containing waste liquid treatment tank through a pipeline, the heavy component dealcoholization tower is respectively connected with the waste gas recovery tower and a heavy component treatment tank through pipelines, the product tower is respectively connected with the waste gas recovery tower and the low polymer recovery tank through pipelines, and the dealcoholization decomposition tower is connected with the PDO-.
And a torch pipe network is arranged in the waste gas recovery tower.
Ultraviolet disinfection equipment is arranged in the alcohol-containing waste liquid treatment tank.
The aldehyde recovery tower is connected with the hydration reactor through an aldehyde recovery pipeline.
The hydrogenation reaction device is connected with hydrogen through a pipeline.
The high-low branch tank is connected with the aldehyde recovery tower through a hydrogen circulating pipeline.
The water recovery device is connected with the hydration reactor through a water circulation pipeline.
The product tower is connected with the product PDO through a pipeline.
The beneficial effects of the utility model are that simple structure, convenient to use all is equipped with a row's stain on each reaction unit, discharges waste gas waste liquid, guarantees purities such as raw materials catalyst in each reaction unit, simultaneously with rational handling such as waste gas waste liquid, neither influences the environment, has guaranteed again that reaction separation is complete, has finally improved the purity of 1, 3-allyl alcohol product.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
The specific implementation mode is as follows:
referring to fig. 1, the present invention specifically adopts the following embodiments: the device comprises a hydration reactor, an aldehyde recovery tower and a hydrogenation reaction device, acrolein and water are connected with the hydration reactor through a pipeline, the hydration reactor is sequentially connected with the aldehyde recovery tower through a pipeline, the hydrogenation reaction device, a high-low component tank, a dealcoholization tower, a water recovery device, a heavy component dealcoholization tower, a product tower and a dealcoholization decomposition tower, the aldehyde recovery tower is connected with a waste gas recovery tower through a pipeline, the hydrogenation reaction device is connected with a catalyst solid recovery tank through a pipeline, the high-low component tank and the dealcoholization tower are respectively connected with the waste gas recovery tower through pipelines, the dealcoholization tower is also connected with an alcohol-containing waste liquid treatment tank through a pipeline, the heavy component dealcoholization tower is respectively connected with the waste gas recovery tower and a heavy component treatment tank through pipelines, the product tower is respectively connected with the waste gas recovery tower and the low polymer recovery tank through pipelines, and the dealcoholization decomposition tower is connected with the PDO-. And a torch pipe network is arranged in the waste gas recovery tower. Ultraviolet disinfection equipment is arranged in the alcohol-containing waste liquid treatment tank. The aldehyde recovery tower is connected with the hydration reactor through an aldehyde recovery pipeline. The hydrogenation reaction device is connected with hydrogen through a pipeline. The high-low branch tank is connected with the aldehyde recovery tower through a hydrogen circulating pipeline. The water recovery device is connected with the hydration reactor through a water circulation pipeline. The product tower is connected with the product PDO through a pipeline.
When the sewage system of the process for continuously producing the 1, 3-propylene glycol by the acrolein works, the acrolein and the water are mixed to form an acrolein water solution, the acrolein water solution enters a hydration reactor to carry out hydration reaction, and the acrolein is partially converted into the 3-hydroxypropionaldehyde under the conditions of 38 ℃ and normal pressure under the action of the catalyst. The reaction product enters an aldehyde recovery tower of the acrolein to recover unreacted acrolein, the reacted acrolein returns to a hydration reactor through an aldehyde circulating pipeline to be recycled, the hydration reaction liquid after the aldehyde removal enters a hydrogenation reaction device to carry out hydrogenation reaction with excessive hydrogen under the action of a catalyst, the hydrogenation reaction liquid enters a high-molecular tank in a high-low molecular tank, the hydrogen is separated from the reaction liquid under the pressure of 2.0MPaG and returns to the aldehyde recovery tower through a hydrogen circulating pipeline, a circulating hydrogen compression system is compressed and then is continuously used, the liquid-phase crude 1, 3-propylene glycol product enters a low-molecular tank in the high-low molecular tank which is operated at normal pressure and is subjected to gas-liquid separation, the residual small amount of hydrogen enters a torch, the reaction liquid enters a separation section, the hydrogenated crude 1, 3-propylene glycol mixed liquid is subjected to dealcoholization by a dealcoholization tower, dehydration of a water recovery device and heavy component removal tower to remove weight, entering a product tower, and finally conveying the generated 1, 3-propylene glycol product to a product tank for storage.
In order to ensure that high-quality polymer grade 1, 3-propylene glycol is obtained, an aldehyde-removing decomposition tower is particularly set up to remove aldehyde-containing substances, then the material flow after aldehyde removal is refined again, and the removed aldehyde is recovered.
And the water removed by the water recovery device flows back to the hydration reactor through the water circulation pipeline for recycling.
In the reaction process, the aldehyde recovery tower, the hydrogenation reaction device, the high-low component tank, the dealcoholization tower, the water recovery device, the heavy component dealcoholization tower, the product tower and the dealdehydization decomposition tower are all provided with stain discharging points, wherein the wastes of the aldehyde recovery tower, the high-low component tank, the dealcoholization tower, the heavy component dealcoholization tower and the product tower are waste gases, the main component of the waste gases is hydrogen, the hydrogen belongs to flammable and explosive gases and cannot be directly discharged into the atmosphere, the waste gases cannot be stored in the device all the time, the purity of fresh hydrogen input is influenced, the waste gases in the device are all conveyed into the waste gas recovery tower through a pipeline, a torch pipe network is arranged in the waste gas recovery tower, the atmosphere is discharged after full combustion, the main components of the waste gases are hydrocarbons such as nitrogen, fusel aldehyde and the like, and the atmosphere cannot be polluted.
The waste liquid and the waste water enter an alcohol-containing waste liquid treatment tank, and the sewage is treated by adopting a pretreatment + A2/O + ultraviolet disinfection process and then reaches the first-class B standard in the discharge Standard of pollutants for municipal wastewater treatment plants (GB18918-2002) and is discharged.
The catalyst is intensively recovered in a catalyst solid recovery tank and is collected and treated uniformly.
A small amount of heavy raffinate and oligomer raffinate can be concentrated and respectively recycled to a heavy component treatment pool and an oligomer recycling tank, and are collected and treated in a unified way.
In conclusion, the sewage system of the process for continuously producing the 1, 3-propylene glycol by the acrolein obtains the 1, 3-propylene glycol product with higher purity by a series of treatments of hydration reaction, hydrogenation reaction, dealcoholization, seed removal and the like of the acrolein water solution, and has the advantages of low production cost, low energy consumption and higher industrial yield, thereby being suitable for large-scale popularization and use.
Claims (8)
1. A blowdown system of acrolein continuous production 1, 3-propylene glycol technology, its characterized in that: the device comprises a hydration reactor, an aldehyde recovery tower and a hydrogenation reaction device, acrolein and water are connected with the hydration reactor through a pipeline, the hydration reactor is sequentially connected with the aldehyde recovery tower through a pipeline, the hydrogenation reaction device, a high-low component tank, a dealcoholization tower, a water recovery device, a heavy component dealcoholization tower, a product tower and a dealcoholization decomposition tower, the aldehyde recovery tower is connected with a waste gas recovery tower through a pipeline, the hydrogenation reaction device is connected with a catalyst solid recovery tank through a pipeline, the high-low component tank and the dealcoholization tower are respectively connected with the waste gas recovery tower through pipelines, the dealcoholization tower is also connected with an alcohol-containing waste liquid treatment tank through a pipeline, the heavy component dealcoholization tower is respectively connected with the waste gas recovery tower and a heavy component treatment tank through pipelines, the product tower is respectively connected with the waste gas recovery tower and the low polymer recovery tank through pipelines, and the dealcoholization decomposition tower is connected with the PDO-.
2. The blowdown system of a process for continuously producing 1, 3-propanediol acrolein according to claim 1, wherein: and a torch pipe network is arranged in the waste gas recovery tower.
3. The blowdown system of a process for continuously producing 1, 3-propanediol acrolein according to claim 1, wherein: ultraviolet disinfection equipment is arranged in the alcohol-containing waste liquid treatment tank.
4. The blowdown system of a process for continuously producing 1, 3-propanediol acrolein according to claim 1, wherein: the aldehyde recovery tower is connected with the hydration reactor through an aldehyde recovery pipeline.
5. The blowdown system of a process for continuously producing 1, 3-propanediol acrolein according to claim 1, wherein: the hydrogenation reaction device is connected with hydrogen through a pipeline.
6. The blowdown system of a process for continuously producing 1, 3-propanediol acrolein according to claim 1, wherein: the high-low branch tank is connected with the aldehyde recovery tower through a hydrogen circulating pipeline.
7. The blowdown system of a process for continuously producing 1, 3-propanediol acrolein according to claim 1, wherein: the water recovery device is connected with the hydration reactor through a water circulation pipeline.
8. The blowdown system of a process for continuously producing 1, 3-propanediol acrolein according to claim 1, wherein: the product tower is connected with the product PDO through a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022618137.7U CN213537769U (en) | 2020-11-12 | 2020-11-12 | Sewage system of acrolein continuous production 1, 3-propylene glycol technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022618137.7U CN213537769U (en) | 2020-11-12 | 2020-11-12 | Sewage system of acrolein continuous production 1, 3-propylene glycol technology |
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| CN213537769U true CN213537769U (en) | 2021-06-25 |
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| CN202022618137.7U Active CN213537769U (en) | 2020-11-12 | 2020-11-12 | Sewage system of acrolein continuous production 1, 3-propylene glycol technology |
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