CN208038350U - A kind of crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System - Google Patents
A kind of crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System Download PDFInfo
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- CN208038350U CN208038350U CN201820264085.8U CN201820264085U CN208038350U CN 208038350 U CN208038350 U CN 208038350U CN 201820264085 U CN201820264085 U CN 201820264085U CN 208038350 U CN208038350 U CN 208038350U
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- propylene
- acrylonitrile
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Abstract
The utility model is related to acrylonitrile preparing technical fields,More particularly to a kind of crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System,The system includes acrylonitrile preparation facilities connected in sequence,Acrylonitrile separator and propylene recovery unit,Propylene recovery unit includes the propylene enrichment plant being sequentially connected,Rich gas compression device and lightness-removing column,The import of propylene enrichment plant is connected with the outlet of acrylonitrile separator,The propylene being discharged in gas from acrylonitrile separator can be enriched with by propylene enrichment plant,And then reduce the outer propylene amount drained into air,Then enriched gas is delivered in rich gas compression device,Rich gas compression device can compress the propylene after enrichment,It is allowed to be conducive to the separation of propylene and low fraction gas in lightness-removing column,The tower bottoms of lightness-removing column is collected,Realize crude propylene and oxygen,Ammonia carries out the recycling of propylene after ammoxidation reaction,And this part propylene can be utilized again,Improve the utilization rate of propylene.
Description
Technical field
The utility model belongs to acrylonitrile preparing technical field, and in particular to a kind of crude propylene preparing acrylonitrile by ammoxidation and third
Alkene recovery system.
Background technology
Ammoxidation of hydrocarbons unsaturated nitrile is a key areas of petroleum industry, wherein is given birth to using propylene ammmoxidation process
Production acrylonitrile has been achieved for important breakthrough.Since propylene ammmoxidation process raw material is cheap and easy to get, technological process is simple and product matter
Amount is preferable, therefore the production method has obtained extensive industrial applications.
The technological process of traditional propylene ammmoxidation process is：(1) propylene liguid and liquid ammonia are entered into propylene, ammonia evaporates
Device, then by after gasification propylene and ammonia mix and reacted into fluidized-bed reactor together with air, catalyst；
(2) product is delivered in chilling tower, in the dilute sulfuric acid sprayed in chilling tower and unreacted ammonia；It (3) again will be from chilling
The gas being discharged in tower is delivered to absorption tower, and the water that declines in absorption tower absorbs soluble product in product, it is other not
Solidifying gas is discharged from tower top, and air is discharged into after burning；(4) absorbing liquid is delivered in treating column and is refined, obtain product
Acrylonitrile.Propylene in traditional ammoxidation of propylene technique specifically refers to crude propylene, content >=93.0v/ of propylene in crude propylene
V%.The catalyst that above-mentioned propylene ammmoxidation process uses is mainly Mo-Bi series catalysts and Sb series catalysts, using above-mentioned catalysis
When agent, the yield of ammoxidation of propylene reaction is relatively low (being only 60% or so).It is in recent years to adopt to improve the yield of product acrylonitrile more
With high-speed catalyst, selectivity (its selectivity 85% or so) of the reaction to acrylonitrile can be improved in high-speed catalyst, into
And improve the yield of acrylonitrile.But when using above-mentioned high-speed catalyst, the conversion ratio of propylene is relatively low in reaction raw materials, by high-altitude
When fast catalyst is applied to above-mentioned conventional propylene ammonia oxidation technique, on the one hand, lower conversion ratio makes third in on-condensible gas
Alkene content is higher, is recycled since prior art directly goes out unreacted propylene from absorbing tower top row and not,
This necessarily lowers the utilization rate of reaction raw materials propylene, improve process costs, while industrial production capacity improves, economic benefit
It is not improved largely；On the other hand, it is discharged into air after being handled from the fixed gas that absorbing tower top row goes out by combustion method,
Since burning has the factors such as incomplete, can also cause environmental pollution.
In consideration of it, how to be improved to the technological process of existing propylene ammmoxidation process, to improve the utilization of propylene
Rate reduces process costs, reduces the pollution to environment, this is a technology urgently to be resolved hurrily to those skilled in the art
Problem.
Utility model content
Therefore, the technical problem to be solved by the utility model is to overcome in the technique of existing propylene ammmoxidation process,
The utilization rate of propylene is low, process costs are high and to the polluted defect of environment, and then provides a kind of crude propylene ammoxidation system third
Alkene nitrile and Propylene Recovery System.
For this purpose, the technical solution that the application takes is,
A kind of crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System, including acrylonitrile preparation facilities connected in sequence
(1) and acrylonitrile separator further include, the propylene recovery unit being connected with the acrylonitrile separator, the propylene returns
Receiving apparatus includes the propylene enrichment plant (2) being sequentially connected, rich gas compression device (3) and lightness-removing column (4), and the propylene enrichment is set
The import of standby (2) is connected with the outlet of the acrylonitrile separator.
The tower bottoms outlet of the lightness-removing column (4) connects the import of the acrylonitrile preparation facilities (1).
The system also includes burning facility (5), import respectively with the outlet of the propylene enrichment plant (2) and described
The top gaseous phase outlet connection of lightness-removing column (4).
The acrylonitrile preparation facilities (1) is fixed bed reactors or fluidized-bed reactor.
The acrylonitrile separator includes the chilling tower (6) being sequentially connected, absorption tower (7) and rectifying column (8), the urgency
The import of cold tower (6) connects the outlet of the acrylonitrile preparation facilities (1), the overhead gas outlet connection of the absorption tower (7)
The tower reactor liquid outlet of the import of the propylene enrichment plant (2), the absorption tower (7) connects the rectifying column (8).
The propylene enrichment plant (2) is PSA devices.
The rich gas compression device (3) is rich gas compressor.
Technical solutions of the utility model have the following advantages that：
1. crude propylene preparing acrylonitrile by ammoxidation provided by the utility model and Propylene Recovery System, including connected in sequence third
Alkene nitrile preparation facilities and acrylonitrile separator further include the propylene recovery unit being connected with acrylonitrile separator, this third
Alkene retracting device includes the propylene enrichment plant being sequentially connected, rich gas compression device and lightness-removing column, the import of propylene enrichment plant
It is connected with the outlet of acrylonitrile separator, in the system, gas can will be discharged from acrylonitrile separator in propylene enrichment plant
Propylene in body is enriched with, and then reduces the outer propylene amount drained into air, and enriched gas is then delivered to rich gas compression
In equipment, rich gas compression device can compress the propylene after enrichment, improve its pressure, be allowed to be conducive to propylene in lightness-removing column
With the separation of low fraction gas, the tower bottoms of lightness-removing column is collected, crude propylene is realized and carries out ammoxidation with oxygen, ammonia
The recycling of propylene after reaction, and this part propylene can be utilized again, so as to reduce process costs, improve the utilization of propylene
Rate is increased economic efficiency while industrial production capacity improves.
2. crude propylene preparing acrylonitrile by ammoxidation provided by the utility model and Propylene Recovery System, further include burning facility,
Its import exports with the top gaseous phase of the outlet of propylene enrichment plant and lightness-removing column connect respectively, since propylene obtains in the system
Thus a large amount of recycling can reduce pollution of the burning of lightness-removing column top gaseous phase and propylene enrichment plant discharge gas to environment.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific implementation mode or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, other drawings may also be obtained based on these drawings.
Fig. 1 is the crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System that the utility model embodiment 1 provides；
Wherein, reference numeral is as follows：
1- acrylonitrile preparation facilities；2- propylene enrichment plants；3- rich gas compression devices；4- lightness-removing columns；5- burning facilities；6-
Chilling tower；The absorption towers 7-；8- rectifying columns.
Specific implementation mode
The technical solution of the utility model will be clearly and completely described below, it is clear that described embodiment is
The utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work belongs to the utility model protection
Range.In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Not constituting conflict can be combined with each other.
Embodiment 1
Crude propylene preparing acrylonitrile by ammoxidation provided in this embodiment and Propylene Recovery System, including, propylene connected in sequence
Nitrile preparation facilities 1, acrylonitrile separator and propylene recovery unit, in the present embodiment, acrylonitrile preparation facilities 1 are fixed bed
Reactor, in other embodiments, acrylonitrile preparation facilities 1 or fluidized-bed reactor, crude propylene and oxygen, ammonia can be
Ammoxidation reaction is carried out in acrylonitrile preparation facilities 1 provided in this embodiment.
Acrylonitrile separator in the present embodiment includes the chilling tower 6 being sequentially connected, absorption tower 7 and rectifying column 8, propylene
Nitrile separator is the device for handling the product of ammoxidation reaction, import and the acrylonitrile preparation facilities 1 of chilling tower 6
Outlet be connected, first, by by acrylonitrile preparation facilities 1 reaction after product be delivered in chilling tower 6, chilling tower 6
In dilute sulfuric acid can to acrylonitrile preparation facilities 1 react after product be washed to remove unreacted ammonia, then will
6 kettle liquid of chilling tower, which is delivered in absorption tower 7, is washed, and absorption tower 7 obtains gas phase and liquid phase after washing, and the present embodiment will be washed
Liquid phase afterwards is delivered to by the tower reactor liquid on absorption tower 7 in rectifying column 8, and carries out in rectifying column 8 being refining to obtain product third
Gas phase after washing is delivered to the recycling richness that propylene is carried out in propylene recovery unit by alkene nitrile by the overhead gas on absorption tower 7
Collection.
Propylene recovery unit in the present embodiment includes the propylene enrichment plant 2 being sequentially connected, rich gas compression device 3 and takes off
Light tower 4, and the import of propylene enrichment plant 2 is connected with the outlet of acrylonitrile separator, the tower bottoms outlet of lightness-removing column 4 connects
The material inlet of acrylonitrile preparation facilities 1 is connect, the propylene enrichment plant 2 in the present embodiment is specially PSA devices, and rich gas compression is set
Standby 3 be specially rich gas compressor, and the gas phase that the present embodiment obtains after washing absorption tower 7 initially enters in propylene enrichment plant 2,
To be enriched with to the propylene in gas phase, Rich propylene body and poor propylene gas are obtained, which is delivered to rich gas
It is pressurized in compression device 3, then Rich propylene body after supercharged is delivered in lightness-removing column 4 and carries out rectifying, passes through rectifying
The separation for realizing propylene and low fraction gas, the tower bottoms of lightness-removing column is collected, realize crude propylene and oxygen, ammonia into
After row ammoxidation reaction in product propylene recycling, and the propylene being recovered to can be back to the object of acrylonitrile preparation facilities 1
Expect that import carries out ammoxidation reaction as the raw material of ammoxidation reaction with oxygen, ammonia, it is thus achieved that propylene further returns
It receives and utilizes, to improve the utilization rate of propylene, reduce process costs.
Crude propylene preparing acrylonitrile by ammoxidation system in the present embodiment further includes burning facility 5, import respectively with propylene
The outlet of enrichment plant 2 and the top gaseous phase outlet connection of lightness-removing column, since propylene has obtained a large amount of recycling in above system, by
This can reduce pollution of the burning of lightness-removing column top gaseous phase and propylene enrichment plant discharge gas to environment.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
Among the protection domain that variation is created still in the utility model.
Claims (7)
1. a kind of crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System, including acrylonitrile preparation facilities connected in sequence (1)
With acrylonitrile separator, which is characterized in that further include the propylene recovery unit being connected with the acrylonitrile separator, institute
It includes the propylene enrichment plant (2) being sequentially connected, rich gas compression device (3) and lightness-removing column (4) to state propylene recovery unit, and described third
The import of alkene enrichment plant (2) is connected with the outlet of the acrylonitrile separator.
2. crude propylene preparing acrylonitrile by ammoxidation according to claim 1 and Propylene Recovery System, which is characterized in that described de-
The tower bottoms outlet of light tower (4) connects the import of the acrylonitrile preparation facilities (1).
3. crude propylene preparing acrylonitrile by ammoxidation according to claim 2 and Propylene Recovery System, which is characterized in that the system
System further includes burning facility (5), the import tower with the outlet and the lightness-removing column (4) of the propylene enrichment plant (2) respectively
Push up gaseous phase outlet connection.
4. crude propylene preparing acrylonitrile by ammoxidation according to claim 3 and Propylene Recovery System, which is characterized in that described third
Alkene nitrile preparation facilities (1) is fixed bed reactors or fluidized-bed reactor.
5. being existed according to claim 1-4 any one of them crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System, feature
In the acrylonitrile separator includes the chilling tower (6) being sequentially connected, absorption tower (7) and rectifying column (8), the chilling tower
(6) import connects the outlet of the acrylonitrile preparation facilities (1), and the overhead gas of the absorption tower (7) exports described in connection
The tower reactor liquid outlet of the import of propylene enrichment plant (2), the absorption tower (7) connects the rectifying column (8).
6. crude propylene preparing acrylonitrile by ammoxidation according to claim 5 and Propylene Recovery System, which is characterized in that described third
Alkene enrichment plant (2) is PSA devices.
7. crude propylene preparing acrylonitrile by ammoxidation according to claim 6 and Propylene Recovery System, which is characterized in that the richness
Gas compression device (3) is rich gas compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820264085.8U CN208038350U (en) | 2018-02-23 | 2018-02-23 | A kind of crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820264085.8U CN208038350U (en) | 2018-02-23 | 2018-02-23 | A kind of crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System |
Publications (1)
| Publication Number | Publication Date |
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| CN208038350U true CN208038350U (en) | 2018-11-02 |
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| CN201820264085.8U Active CN208038350U (en) | 2018-02-23 | 2018-02-23 | A kind of crude propylene preparing acrylonitrile by ammoxidation and Propylene Recovery System |
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| Country | Link |
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2018
- 2018-02-23 CN CN201820264085.8U patent/CN208038350U/en active Active
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