CN205556519U - System that utilizes of system's acid waste water is refine to acetonitrile - Google Patents
System that utilizes of system's acid waste water is refine to acetonitrile Download PDFInfo
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- CN205556519U CN205556519U CN201520681823.5U CN201520681823U CN205556519U CN 205556519 U CN205556519 U CN 205556519U CN 201520681823 U CN201520681823 U CN 201520681823U CN 205556519 U CN205556519 U CN 205556519U
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Abstract
The utility model relates to a system that utilizes of system's acid waste water is refine to acetonitrile, this system includes: decyanation tower, this decyanation tower are arranged in obtaining from the thick acetonitrile desorption light component of raw materials and produce the acid waste water as the tower bottoms, heat exchanger, and the quench tower, gaseous phase commodity circulation that this quench tower is used for rapid cooling propylene ammonia oxidation reactor to distil off wherein, lies in among the heat exchanger that the acid waste water is incorporated into among the quenching liquid that will add the quench tower by the cooling back to with the quenching liquid no. 1 quench gas looks commodity circulation in the quench tower that coexists, utilize simultaneously acid in the acid waste water come in with the gaseous phase commodity circulation in partial ammonia. According to the utility model discloses, in adding the acid waste water after the heat transfer quench tower of propylene ammonia oxidation system acrylonitrile system, reduce the sour quantity of quench tower N -process, reduced the waste water volume of burning of burning burning furnace, reduced the energy consumption.
Description
Technical field
What the utility model related to the acid waste water in a kind of acetonitrile refining system utilizes system..
Background technology
In the production process of ammoxidation of propylene acrylonitrile production, coproduct hydrogen cyanic acid and acetonitrile simultaneously, wherein the impurity such as aldehyde, ketone, azoles, propionitrile and a small amount of hydrogen cyanide are extracted to acetonitrile solution in acrylonitrile extraction desorption process, in acetonitrile desorption or stripping to crude acetonitrile.Generally we use by decyanation tower, chemical treatment, reduce pressure, the group technology of the azeotropic distillation that pressurizes, acetonitrile is reclaimed continuously.The technique that such as document EP055920 reports a kind of continuous recovery acetonitrile, this technique uses light component, the chemical treatments such as rectifying removing hydrogen cyanide to remove hydrogen cyanide, rectification under vacuum and the method for compression rectification combined dehydration further, improve the refined recovery rate of acetonitrile, the acetonitrile product of available higher degree.Document CN1328994A also discloses that a kind of high-purity acetonitrile refining method, high-purity acetonitrile is reclaimed continuously from containing acetonitrile, water, HCN, azoles and the organic crude acetonitrile of weight, the technique of the method recovery continuous to tradition acetonitrile is improved, by increasing a liquid phase outlet port on the rectifying section top of decyanation tower, the azoles of accumulation is made to be discharged system smoothly.
Above-mentioned technique all have employed the technique of acetonitrile extracting the impurity such as aqueous in decyanation tower light component such as removing hydrogen cyanide etc., stripping section side line gas phase out, and this extraction acetonitrile material is chemically treated, obtain acetonitrile finished product after decompression and pressurizing and dehydrating.Due to the hydrogen cyanide impurity contained in the charging of decyanation tower, easily causing the blocking of knockout tower interior polymeric in subtractive process, the long period affecting device runs the most continuously.Use the technique adding the acid mediums such as acetic acid in decyanation column overhead, can effectively reduce the generation of tower interpolymer, the cycle of operation of effective extension fixture.The acid waste water that decyanation tower tower reactor produces is delivered to incinerator and is burnt but.Specifically, as it is shown in figure 1, the raw material crude acetonitrile 2 material inlet in the middle part of decyanation tower 1 enters.Raw material can comprise the acetonitrile of Partial purification, can come from any applicable source, such as, desorbing tower top from acrylonitrile installation acetonitrile.Acetic acid 3 adds from top gaseous phase logistics, and the gas phase acetonitrile 4 after purification is discharged as tower bottoms 5 from lateral line withdrawal function, part water and heavy component, sends to system incinerator and burns but.
But, in the above-mentioned methods, for as tower bottoms 5 acid waste water, directly send to system incinerator and burn the waste the most not only causing water, and air may be caused pollution further.Accordingly, it is desirable to be able to tower bottoms exploitation is more effectively utilized system and method.
Utility model content
In order to solve the problems referred to above, the utility model aims to provide the Application way of a kind of acid waste water.The method effectively utilizes the acid feature of this strand of waste water, is joined by acid waste water in the chilling tower of ammoxidation of propylene acrylonitrile production system after heat exchange, decreases the sour consumption of chilling tower N-process, decreases the waste water incineration amount of incinerator, reduces energy consumption.
One side of the present utility model provides a kind of spent acidic water utilization system, and this system includes:
Decyanation tower, this decyanation tower is for removing light component and producing the acid waste water as tower bottoms from raw material crude acetonitrile；
Heat exchanger, this heat exchanger is connected to described decyanation tower, and described acid waste water is sent to this heat exchanger, to carry out heat exchange with cooling water；And
Chilling tower, the gaseous stream that this chilling tower distillates for chilling ammoxidation of propylene reactor, it is characterised in that
Described heat exchanger is connected to the pipeline for adding chilling liquid to described chilling tower, after described heat exchanger is cooled, described acid waste water is incorporated in the described chilling liquid adding described chilling tower, with the together gaseous stream described in chilling in described chilling tower with described chilling liquid, utilize the acid in described acid waste water to the part ammonia neutralizing in described gaseous stream simultaneously.
In above-mentioned spent acidic water utilization system, it is preferable that the temperature of the described acid waste water at described heat exchanger outlet is less than 65 DEG C.
In above-mentioned spent acidic water utilization system, it is preferable that in described heat exchanger, the raw material crude acetonitrile adding described decyanation tower is maybe carried out heat exchange with cooling water by described acid waste water.
Utility model effect
According to the utility model, acid waste water is joined after heat exchange in the chilling tower of ammoxidation of propylene acrylonitrile production system, decrease the sour consumption of chilling tower N-process, decrease the waste water incineration amount of incinerator, reduce energy consumption.
Accompanying drawing explanation
Fig. 1 is the decyanation tower schematic diagram of prior art.
Fig. 2 is the schematic diagram of spent acidic water utilization system of the present utility model
Fig. 3 is the schematic diagram of spent acidic water utilization system of the present utility model.
Detailed description of the invention
Hereinafter, the detailed description of the invention of spent acidic water utilization system of the present utility model will be described with reference to the drawings.
[the first embodiment]
As in figure 2 it is shown, in the first embodiment of the present utility model, the operation of decyanation tower section is identical with the prior art shown in Fig. 1, i.e. the raw material crude acetonitrile 2 material inlet in the middle part of decyanation tower 1 enters.Raw material can comprise the acetonitrile of Partial purification, can come from any applicable source, such as, desorbing tower top from acrylonitrile installation acetonitrile.The acid 3 of such as acetic acid being added from top gaseous phase logistics, the gas phase acetonitrile 4 after purification is discharged as tower bottoms 5 from lateral line withdrawal function, part water and heavy component.
Difference with the prior art is, in spent acidic water utilization system of the present utility model, the acid waste water as tower bottoms is not sent to system incinerator burning but, but is used further.Specifically, as in figure 2 it is shown, will send to after heat exchanger 11 carries out heat exchange with cooling water 12 as the acid waste water of tower bottoms 5, then merge with the chilling liquid 7 that will flow into chilling tower 6, the most together enter chilling tower 6.At chilling tower section, ammoxidation of propylene reactor outlet gas 8 is admitted to chilling tower 6 after being cooled to about 200 DEG C, chilling liquid 7 enters chilling tower 6 after merging with the acid waste water 5 after above-mentioned cooling, reacting gas 8 is carried out chilling, acidic materials in chilling liquid are neutralized reaction with the unreacted ammonia in reacting gas simultaneously, after chilling, reacting gas 9 goes to subsequent absorption workshop section, chilling tower bottoms 10 to send to subsequent wastewater treatment from chilling column overhead.
In above-mentioned spent acidic water utilization system, the acid to joining decyanation column overhead gaseous stream is not specifically limited, and can be sulfuric acid, phosphoric acid or acetic acid etc..But preferably acetic acid.And the concentration of acetic acid is preferably 50wt%.
In view of the acid waste water after cooling is incorporated in chilling liquid, it is therefore preferred that the temperature of the acid waste water in the exit of heat exchanger 11 is less than 65 DEG C, more preferably less than 60 DEG C.
[the second embodiment]
Second embodiment of the present utility model is as shown in Figure 3.Difference with the first embodiment is, in a heat exchanger 11, it is not necessary to individually cooling water supply, but the raw material crude acetonitrile 2 of tower bottoms 5 with decyanation tower 1 to be entered is carried out heat exchange, thus reaches the purpose being cooled to.According to the second embodiment of the present utility model, reduce further the consumption of cooling water, thus realize more preferable energy-saving effect.
Embodiment
Below by embodiment, the utility model is further elaborated.
[embodiment 1]
Containing acetonitrile 50%, HCN2.5%, acrylonitrile 0.12%, remaining be water crude acetonitrile raw material from the middle part of decyanation tower 1 add, feeding temperature is 40 DEG C, and tower top pressure is 0.12MPA, and tower top drop temperature is 53 DEG C, and bottom temperature is 115 DEG C.Acetic acid 3 is added, so that decyanation tower tower reactor PH controls about 4 in the porch of decyanation column overhead gaseous phase materials to overhead condenser.At the acetonitrile 4 that decyanation tower 1 stripping section lateral line withdrawal function concentration is 78 weight %, extracting temperature out is 96 DEG C.Decyanation top of tower gas phase enters condenser, and condenser lime set is back to decyanation tower, and fixed gas sends to burning.Decyanation tower tower reactor waste water 5 is sent to heat exchanger 11 and is entered chilling tower 6 after mixing with the chilling liquid 7 of acrylonitrile master device chilling tower 6 after cooling water 12 heat exchange, and chilling tower waste water 10 delivers to follow-up waste water.
[embodiment 2] containing acetonitrile 50%, HCN2.5%, acrylonitrile 0.12%, remaining be water crude acetonitrile raw material from the middle part of decyanation tower 1 addition, feeding temperature is 40 DEG C, and tower top pressure is 0.12MPA, and tower top drop temperature is 53 DEG C, and bottom temperature is 115 DEG C.Acetic acid 3 is added, so that decyanation tower tower reactor PH controls about 4 in the porch of decyanation column overhead gaseous phase materials to overhead condenser.At the acetonitrile 4 that decyanation tower 1 stripping section lateral line withdrawal function concentration is 78 weight %, extracting temperature out is 96 DEG C.Decyanation top of tower gas phase enters condenser, and condenser lime set is back to decyanation tower, and fixed gas sends to burning.Decyanation tower tower reactor waste water 5 is sent to heat exchanger 11 and is fed with decyanation tower after 2 heat exchange after the chilling liquid 7 with acrylonitrile master device chilling tower 6 mixes and enter chilling tower 6, and chilling tower waste water 10 delivers to follow-up waste water.
[comparative example 1] containing acetonitrile 50%, HCN2.5%, acrylonitrile 0.12%, remaining be water crude acetonitrile raw material from the middle part of decyanation tower 1 addition, feeding temperature is 40 DEG C, and tower top pressure is 0.12MPA, and tower top drop temperature is 53 DEG C, and bottom temperature is 115 DEG C.Acetic acid 3 is added, so that decyanation tower tower reactor PH controls about 4 in the porch of decyanation column overhead gaseous phase materials to overhead condenser.At the acetonitrile 4 that decyanation tower 1 stripping section lateral line withdrawal function concentration is 78 weight %, extracting temperature out is 96 DEG C.Decyanation top of tower gas phase enters condenser, and condenser lime set is back to decyanation tower, and fixed gas sends to burning.Decyanation tower tower reactor waste water 5 sends to incinerator.
As mentioned above, according to spent acidic water utilization system of the present utility model and Application way, acid waste water is joined after heat exchange in the chilling tower of ammoxidation of propylene acrylonitrile production system, decrease the sour consumption of chilling tower N-process, decrease the waste water incineration amount of incinerator, reduce energy consumption.
Claims (3)
1. a spent acidic water utilization system, this system includes:
Decyanation tower, this decyanation tower is for removing light component and producing the acid waste water as tower bottoms from raw material crude acetonitrile；
Heat exchanger, this heat exchanger is connected to described decyanation tower, and described acid waste water is sent to this heat exchanger, to carry out heat exchange with cooling water；And
Chilling tower, the gaseous stream that this chilling tower distillates for chilling ammoxidation of propylene reactor,
It is characterized in that, described heat exchanger is connected to the pipeline for adding chilling liquid to described chilling tower, after described heat exchanger is cooled, described acid waste water is incorporated in the described chilling liquid adding described chilling tower, with the together gaseous stream described in chilling in described chilling tower with described chilling liquid, utilize the acid in described acid waste water to the part ammonia neutralizing in described gaseous stream simultaneously.
Spent acidic water utilization system the most according to claim 1, it is characterised in that the temperature of the described acid waste water at described heat exchanger outlet is less than 65 DEG C.
Spent acidic water utilization system the most according to claim 1 and 2, it is characterised in that in described heat exchanger, maybe carries out heat exchange by the raw material crude acetonitrile adding described decyanation tower by described acid waste water with cooling water.
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| CN201520681823.5U CN205556519U (en) | 2015-09-06 | 2015-09-06 | System that utilizes of system's acid waste water is refine to acetonitrile |
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| CN201520681823.5U CN205556519U (en) | 2015-09-06 | 2015-09-06 | System that utilizes of system's acid waste water is refine to acetonitrile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109663379A (en) * | 2017-10-13 | 2019-04-23 | 抚顺伊科思新材料有限公司 | A kind of energy conservation acetonitrile method cracking c_5 separation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109663379A (en) * | 2017-10-13 | 2019-04-23 | 抚顺伊科思新材料有限公司 | A kind of energy conservation acetonitrile method cracking c_5 separation method |
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