CN203355328U - Dimethyl acetamide rectification system - Google Patents
Dimethyl acetamide rectification system Download PDFInfo
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- CN203355328U CN203355328U CN 201320331890 CN201320331890U CN203355328U CN 203355328 U CN203355328 U CN 203355328U CN 201320331890 CN201320331890 CN 201320331890 CN 201320331890 U CN201320331890 U CN 201320331890U CN 203355328 U CN203355328 U CN 203355328U
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- dimethylacetylamide
- rectifying column
- dimethyl acetamide
- rectifying
- rectification
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Abstract
The utility model provides a dimethyl acetamide rectification system and solves the problem in the prior art that the product quality is influenced by poor separation effect of a rectifying tower and high contents of acid and water in a dimethyl acetamide product in the dimethyl acetamide rectification and purification production technology. The rectification system comprises a dimethyl acetamide rectification device, a condensing device and an evacuating device, wherein the dimethyl acetamide rectification device is used for rectifying dimethyl acetamide synthetic crude liquid; the condensing device is connected with the dimethyl acetamide rectification device and used for cooling down the dimethyl acetamide gas rectified by the dimethyl acetamide rectification device; the evacuating device is connected with the condensing device and used for vacuumizing the condensing device to enable the condensing device and the dimethyl acetamide rectification device to produce negative pressure. By adopting the technical scheme, the dimethyl acetamide rectification system contributes to lowering the contents of both water and acid in dimethyl acetamide and improving the product purity, thereby improving the product quality.
Description
Technical field
The utility model relates to chemical production field, relates in particular to a kind of dimethylacetylamide distillation system.
Background technology
At present; in the production of dimethylacetylamide; method of acetic acid is a kind of a kind of method of applicable serialization large-scale production, and its technique mainly be take acetic acid and dimethylamine and synthesized as material, and the thick liquid of dimethylacetylamide after synthetic obtains qualified dimethylacetylamide product through rectification and purification.But in existing rectification and purification production technology, often there will be rectifying column inferior separating effect, dimethylacetylamide product acid content and water content high, thereby affect the problem of product quality.
Therefore; in the prior art, in dimethylacetylamide rectification and purification production technology, often there will be rectifying column inferior separating effect, dimethylacetylamide product acid content and water content high, thereby affect the quality of product; for these problems, effective solution is not yet proposed at present.
Summary of the invention
Main purpose of the present utility model is to provide a kind of dimethylacetylamide distillation system, thereby often there will be the high problem that affects product quality of rectifying column inferior separating effect, dimethylacetylamide product acid content and water content to solve in prior art in dimethylacetylamide rectification and purification production technology.
To achieve these goals, the utility model provides a kind of dimethylacetylamide distillation system.
Dimethylacetylamide distillation system of the present utility model comprises: the dimethylacetylamide rectifier unit, carry out distillation operation for the synthetic thick liquid to dimethylacetylamide; Condensing unit, be connected with the dimethylacetylamide rectifier unit, for the dimethylacetylamide gas after the rectifying of cooling dimethylacetylamide rectifier unit; Vacuum extractor, be connected with condensing unit, for by condensing unit is carried out to vacuum pumping, makes condensing unit and dimethylacetylamide rectifier unit produce negative pressure.
Further, the dimethylacetylamide rectifier unit comprises: rectifying column, and the one side arranges upper feeding mouth and lower charging aperture, and opposite side arranges refluxing opening, and top arranges the rectifying gas discharge outlet, and the rectifying gas discharge outlet is connected with condensing unit; The upper feeding pipe, be connected with the upper feeding mouth of rectifying column; Lower feed pipe, be connected with the lower charging aperture of rectifying column.
Further, in rectifying column, arrange: the first branched pipe distributor is connected with the upper feeding mouth of rectifying column; The second branched pipe distributor, be connected with the lower charging aperture of rectifying column; The 3rd branched pipe distributor, be connected with the refluxing opening of rectifying column.
Further, condensing unit comprises: condenser, and its upper end air inlet is connected with the rectifying gas discharge outlet of rectifying column; Backflash, its inlet is connected with the lower end liquid outlet of condenser, for storing condensed dimethylacetylamide liquid; Reflux pump, its inlet is connected with the liquid outlet of backflash, and its liquid outlet is connected with the refluxing opening of rectifying column.
Further, the liquid outlet of reflux pump external dimethylacetylamide finished product storage device also.
Further, vacuum extractor comprises: vavuum pump; The gas-liquid separator tank, its air inlet is connected with condenser, and its gas outlet is connected with vavuum pump; Vacuum drainage facility, be connected with the bottom liquid outlet of gas-liquid separator tank.
According to the technical solution of the utility model, by setting up lower charging aperture, increased the rectifying section height of rectifying column, make dimethylacetylamide product acid content's index more stable; The setting of three cover branched pipe distributors, guaranteed that the interior feeding liquid of rectifying column and phegma are uniformly distributed, and make gas phase in tower can fully contact with liquid phase, thereby have improved tower top dimethylacetylamide product extraction purity; Increase vacuum drainage facility a set of, greatly reduce the water content of dimethylacetylamide product, thereby improved the product quality of dimethylacetylamide.
The accompanying drawing explanation
Figure of description is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model, for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation block diagram according to the dimethylacetylamide distillation system of the utility model embodiment.And
Fig. 2 is the entity connection layout of Fig. 1.
The specific embodiment
It should be noted that, in the situation that do not conflict, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
Fig. 1 is the structural representation block diagram according to the dimethylacetylamide distillation system 100 of the utility model embodiment.
As shown in Figure 1, dimethylacetylamide distillation system 100 of the present utility model comprises:
Fig. 2 is the entity connection layout of Fig. 1.
As shown in Figure 2, in this entity connection layout, dimethylacetylamide rectifier unit 110 mainly comprises:
Rectifying column 115, the one side arranges upper feeding mouth A and lower charging aperture B, and opposite side arranges refluxing opening C, and top arranges rectifying gas discharge outlet D; Upper feeding pipe 111 is connected with upper feeding mouth A, and lower feed pipe 113 is connected with lower charging aperture B, and rectifying gas discharge outlet D is connected with condensing unit 130.
In the production process of dimethylacetylamide product, qualified dimethylamine and acetic acid pressurize and join reactor by feed pump from its storage tank by analysis, mixed material maintains under uniform temperature, pressure after heating by the reactor preheater, carry out the synthetic reaction of dimethylacetylamide, unreacted dimethylamine out returns to participation reaction again in tower from tower top after condenser condenses at the bottom of tower, and the reactor out pressured difference of adjusting of mixture process discharge control valve enters a tower.In a tower, the light components such as dimethylamine and water are separated from tower top, and the tower top material, through condenser condenses, enters the distillate stock chest, and the storage tank material enters in tower as refluxing, with the upper middle part temperature of adjusting tower through reflux pump pressurization rear section; The synthetic pressured difference of thick liquid such as the dimethylacetylamide at the bottom of one tower, n-formyl sarcolysine base formamide, acetic acid, water enters rectifying column 115 by upper feeding pipe 111 and lower feed pipe 113.
Traditional rectifying column only has a charging aperture, makes rectifying column rectifying section height less than normal, causes the rectifying column separating effect poor, and overhead extraction dimethylacetylamide product acid content is high, in the 100ppm left and right.In dimethylacetylamide distillation system 100 of the present utility model, set up a lower charging aperture B, thereby increased the rectifying section height of rectifying column 115, dimethylacetylamide product acid content's index is more stable, can be controlled at below 30ppm, thereby improved the product quality of dimethylacetylamide, met customer requirement.
In rectifying column 115, also arrange: the first branched pipe distributor 1151, the second branched pipe distributor 1152 and the 3rd branched pipe distributor 1153.Wherein, the first branched pipe distributor 1151 is connected with the upper feeding mouth A of rectifying column 115; The second branched pipe distributor 1152 is connected with the lower charging aperture B of rectifying column 115; The 3rd branched pipe distributor 1153 is connected with the refluxing opening C of rectifying column 115.
In the present embodiment, the setting of three cover branched pipe distributors, guaranteed that the interior feeding liquid of rectifying column 115 and phegma are uniformly distributed, gas phase in tower can fully be contacted with liquid phase, thereby improve tower top dimethylacetylamide product extraction purity, before not increasing by three cover branched pipe distributors, the product purity of dimethylacetylamide is low, only has 99.95%; After having increased by three cover branched pipe distributors, the product purity of dimethylacetylamide can be controlled at 99.98%, thereby has improved the product quality of dimethylacetylamide.
As shown in Figure 2, in this entity connection layout, condensing unit 130 mainly comprises:
Backflash 133, its inlet is connected with the lower end liquid outlet of condenser 131, for storing condensed dimethylacetylamide liquid.
In rectifying column 115, according to the difference of boiling point, light component dimethylformamide, water, acetic acid are discharged to condenser 131 through tower top rectifying gas discharge outlet D; Condensed product mixture enters backflash 133, and the gas in condenser 131 is discharged by its shell side outlet emptying; Partial material in backflash 133 is sent into rectifying column 115 as refluxing after pressurizeing by reflux pump 135, and dimethylacetylamide finished product storage device 200 is arrived in the material extraction that another part is qualified.
As shown in Figure 2, in this entity connection layout, vacuum extractor 150 mainly comprises:
Gas-liquid separator tank 153, its air inlet is connected with condenser 131, and its gas outlet is connected with vavuum pump 151.
In the present embodiment, gas-liquid separator tank 153 is also vacuum buffer tank, mainly prevents from material is evacuated to vavuum pump 151.
Traditional vacuum extractor does not arrange drainage equipment, vacuumizes gas after the gas-liquid separator tank, and condensed fluid is got back to backflash, and after condensation, liquid water content, in the 7000ppm left and right, causes dimethylacetylamide product water content higher by analysis.
In the present embodiment, increase vacuum drainage facility 155 a set of, liquid in gas-liquid separator tank 153 does not return backflash 153, sell in bucket or reclaim but regularly be discharged into, dimethylacetylamide distillation system 100 of the present utility model by analysis, after condensation, liquid water content can be controlled at below 100ppm, thereby has also improved the product quality of dimethylacetylamide.
In sum, dimethylacetylamide distillation system 100 of the present utility model, by setting up lower charging aperture B, thereby increased the rectifying section height of rectifying column 115, makes dimethylacetylamide product acid content's index more stable; The setting of three cover branched pipe distributors, guaranteed that the interior feeding liquid of rectifying column 115 and phegma are uniformly distributed, and gas phase in tower can fully be contacted with liquid phase, thereby improve tower top dimethylacetylamide product extraction purity; Increase vacuum drainage facility 155 a set of, greatly reduce the water content of dimethylacetylamide product, thereby improved the product quality of dimethylacetylamide.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (6)
1. a dimethylacetylamide distillation system, is characterized in that, comprising:
The dimethylacetylamide rectifier unit, carry out distillation operation for the synthetic thick liquid to dimethylacetylamide;
Condensing unit, be connected with described dimethylacetylamide rectifier unit, for the dimethylacetylamide gas after the rectifying of cooling described dimethylacetylamide rectifier unit;
Vacuum extractor, be connected with described condensing unit, for by described condensing unit is carried out to vacuum pumping, makes described condensing unit and described dimethylacetylamide rectifier unit produce negative pressure.
2. distillation system according to claim 1, is characterized in that, described dimethylacetylamide rectifier unit comprises:
Rectifying column, the one side arranges upper feeding mouth and lower charging aperture, and opposite side arranges refluxing opening, and top arranges the rectifying gas discharge outlet, and described rectifying gas discharge outlet is connected with described condensing unit;
The upper feeding pipe, be connected with the upper feeding mouth of described rectifying column;
Lower feed pipe, be connected with the lower charging aperture of described rectifying column.
3. distillation system according to claim 2, is characterized in that, in described rectifying column, arranges:
The first branched pipe distributor, be connected with the upper feeding mouth of described rectifying column;
The second branched pipe distributor, be connected with the lower charging aperture of described rectifying column;
The 3rd branched pipe distributor, be connected with the refluxing opening of described rectifying column.
4. distillation system according to claim 2, is characterized in that, described condensing unit comprises:
Condenser, its upper end air inlet is connected with the rectifying gas discharge outlet of described rectifying column;
Backflash, its inlet is connected with the lower end liquid outlet of described condenser, for storing condensed dimethylacetylamide liquid;
Reflux pump, its inlet is connected with the liquid outlet of described backflash, and its liquid outlet is connected with the refluxing opening of described rectifying column.
5. distillation system according to claim 4, is characterized in that, the liquid outlet of described reflux pump is external dimethylacetylamide finished product storage device also.
6. distillation system according to claim 4, is characterized in that, described vacuum extractor comprises:
Vavuum pump;
The gas-liquid separator tank, its air inlet is connected with described condenser, and its gas outlet is connected with described vavuum pump;
Vacuum drainage facility, be connected with the bottom liquid outlet of described gas-liquid separator tank.
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|---|---|---|---|
| CN 201320331890 CN203355328U (en) | 2013-06-07 | 2013-06-07 | Dimethyl acetamide rectification system |
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| CN 201320331890 CN203355328U (en) | 2013-06-07 | 2013-06-07 | Dimethyl acetamide rectification system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109111005A (en) * | 2018-09-19 | 2019-01-01 | 四川久润环保科技有限公司 | A kind of method and system of the high purity DMAC from industrial wastewater |
| CN110017490A (en) * | 2019-02-28 | 2019-07-16 | 苏州巨联环保有限公司 | A kind of dimethylamine incinerator and dimethylamine incinerating method |
| CN110483325A (en) * | 2019-09-26 | 2019-11-22 | 新乡双鹭药业有限公司 | A kind of method of purification of NN dimethyl acetamide |
| CN110759832A (en) * | 2019-11-16 | 2020-02-07 | 安徽金禾实业股份有限公司 | DMAC (dimethylacetamide) residual liquid recycling device and method |
-
2013
- 2013-06-07 CN CN 201320331890 patent/CN203355328U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109111005A (en) * | 2018-09-19 | 2019-01-01 | 四川久润环保科技有限公司 | A kind of method and system of the high purity DMAC from industrial wastewater |
| CN110017490A (en) * | 2019-02-28 | 2019-07-16 | 苏州巨联环保有限公司 | A kind of dimethylamine incinerator and dimethylamine incinerating method |
| CN110483325A (en) * | 2019-09-26 | 2019-11-22 | 新乡双鹭药业有限公司 | A kind of method of purification of NN dimethyl acetamide |
| CN110759832A (en) * | 2019-11-16 | 2020-02-07 | 安徽金禾实业股份有限公司 | DMAC (dimethylacetamide) residual liquid recycling device and method |
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