CN215693813U - Toluene oxidation technology tail oxygen content controlling means - Google Patents
Toluene oxidation technology tail oxygen content controlling means Download PDFInfo
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- CN215693813U CN215693813U CN202122329762.4U CN202122329762U CN215693813U CN 215693813 U CN215693813 U CN 215693813U CN 202122329762 U CN202122329762 U CN 202122329762U CN 215693813 U CN215693813 U CN 215693813U
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Abstract
The utility model discloses a toluene oxidation process tail oxygen content control device, which comprises a toluene feed pump, an air compressor, a nitrogen compressor and a reaction kettle. Through the design of structures such as a lean oxygen mixer, a nitrogen distribution table and the like, one path of air divided into two paths enters the lean oxygen mixer to prepare lean oxygen air, the other path of reaction kettle is quantitatively branched and enters the bottom of an oxidation reaction kettle to carry out normal oxidation reaction, and when the tail oxygen content reaches an interlocking value, an air valve is closed emergently to cut off air feeding, so that the oxygen content is controlled; divide into the nitrogen gas of three routes wherein one of them and merge into oxidation tail gas house steward, thereby when oxidation tail gas house steward's tail oxygen content reached the interlock value, promptly open the nitrogen gas valve and cut in nitrogen gas and control nitrogen gas content, the utility model provides a tail oxygen content control mode in toluene air oxidation technology has improved oxidation reaction target product yield to guarantee that reation kettle tail oxygen content does not exceed standard, controlled the risk of blasting of device.
Description
Technical Field
The utility model belongs to the technical field of organic chemical production, concretely relates to tail oxygen content control device of oxidation technology, especially tail oxygen content control in the toluene liquid phase air oxidation reaction preparation benzyl peroxide technology.
Background
In the chemical industry production, liquid phase toluene and air are oxidized to generate benzyl peroxide, and chlorine-free products such as benzyl alcohol, benzaldehyde, benzoic acid and the like can be prepared. In the process of carrying out oxidation reaction on toluene and air, if the content of tail oxygen is low, deep oxidation is easy to occur, and the yield of the target product increased by-products is low; if the tail oxygen content is high, the reaction rate is reduced, and the energy consumption of the device is increased due to the reduction of the overall yield. Meanwhile, in a gas phase space of a reaction kettle for generating benzyl peroxide through a toluene air oxidation reaction, a toluene-oxygen-nitrogen multi-element system exists, and if the oxygen content exceeds the standard, a burning explosion safety risk is caused to a reaction device, so that a toluene oxidation process tail oxygen content control device needs to be provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a toluene oxidation process tail oxygen content control device, which is used for improving the yield of a target product of an oxidation reaction, ensuring that the tail oxygen content of a reaction kettle does not exceed the standard, and controlling the burning and explosion risks of the device so as to solve the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme:
a toluene oxidation technology tail oxygen content controlling means includes:
a toluene feed pump, an air compressor, a nitrogen compressor and a reaction kettle;
the toluene feeding pump is communicated with the inlet of the reaction kettle;
the air compressor is communicated to an air distribution platform through an air heater, the air distribution platform outputs the heated air into two paths, one path of air is directly communicated with an inlet of the reaction kettle, and the other path of air is communicated with an inlet pipe of the lean oxygen mixer;
the nitrogen compressor is communicated with a nitrogen distribution table and divides output nitrogen into three paths, wherein one path of nitrogen is communicated with an inlet pipe of the oxygen-poor mixer, the other path of nitrogen is communicated with an outlet pipe of the oxygen-poor mixer, the third path of nitrogen is directly merged into an outlet tail gas header pipe of the reaction kettle, and an outlet pipe of the oxygen-poor mixer is communicated with an inlet of the reaction kettle;
the bottom and the upper portion intercommunication of reation kettle have a circulating line, and be provided with toluene circulating pump and reaction heat taker on this circulating line, the export tail gas house steward of reation kettle disposes two sets of tail oxygen analysis appearance, and the tail gas through tail oxygen analysis appearance lets in the oxidation tail gas export.
Preferably, the toluene feed pump, the air compressor and the nitrogen compressor are respectively provided with a toluene inlet, an air inlet and a nitrogen inlet.
Preferably, an air feeding cut-off valve and a toluene feeding cut-off valve are arranged at the inlet of the reaction kettle; the outlet pipe of nitrogen gas, air and poor oxygen blender all the way communicates in reation kettle's entry through air feeding trip valve, toluene charge pump communicates in reation kettle's entry through toluene feeding trip valve.
Preferably, when the tail oxygen content reaches an interlocking value, the air feeding cut-off valve is closed emergently to cut off the air feeding; the air temperature control range of the air feeding cut-off valve is 190 ℃ and 210 ℃, and the pressure control range is 1.0-1.2 MPa.
Preferably, the temperature control range of the reaction kettle is 185-205 ℃, the pressure control range is 0.9-1.1Mpa, the normal reaction tail oxygen content control range is 0.5-2%, and the tail oxygen content interlocking value is 5%.
Preferably, the pressure control range of the nitrogen distribution table for the third path of nitrogen directly merged into the oxidation tail gas main pipe is 0.9-1.1 Mpa.
Preferably, the two groups of tail oxygen analyzers comprise a first tail oxygen analyzer and a second tail oxygen analyzer, and the first tail oxygen analyzer and the second tail oxygen analyzer are arranged in front of the joint of the third path of nitrogen and the reaction kettle outlet tail gas main pipe.
Compared with the prior art, the utility model has the beneficial effects that:
through the design of structures such as a toluene feeding pump, an air nitrogen compressor, a lean oxygen mixer, a nitrogen distribution table and the like, one path of air divided into two paths enters the lean oxygen mixer to prepare lean oxygen air, the other path of reaction kettle is quantitatively branched to enter the bottom of an oxidation reaction kettle for normal oxidation reaction, and when the tail oxygen content reaches an interlocking value, an air valve is closed emergently to cut off air feeding, so that the oxygen content is controlled; the utility model provides a tail oxygen content control mode in a toluene air oxidation process, which improves the yield of target products of oxidation reaction, ensures that the tail oxygen content of a reaction kettle does not exceed the standard and controls the burning and explosion risks of a device.
Drawings
FIG. 1 is a schematic diagram of a logic structure of a device for controlling the tail oxygen content in the toluene oxidation process.
In the figure: 1. a toluene inlet; 2. an air inlet; 3. a nitrogen inlet; 4. a toluene feed pump; 5. an air compressor; 6. a nitrogen compressor; 7. an air distribution table; 8. a lean oxygen mixer; 9. a nitrogen gas distribution table; 10. a reaction kettle; 11. a toluene circulating pump; 12. a reaction heat extractor; 13. a first tail oxygen analyzer; 14. a second tail oxygen analyzer; 15. an oxidized tail gas outlet; 16. an air heater; 17. an air feed shut-off valve; 18. toluene feed shut-off valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a device for controlling the tail oxygen content in a toluene oxidation process, the device comprising:
a toluene feeding pump 4, an air compressor 5, a nitrogen compressor 6 and a reaction kettle 10;
the toluene feeding pump 4, the air compressor 5 and the nitrogen compressor 6 are respectively provided with a toluene inlet 1, an air inlet 2 and a nitrogen inlet 3;
the toluene feeding pump 4 is communicated with an inlet of the reaction kettle 10;
the air compressor 5 is communicated to an air distribution platform 7 through an air heater 16, the air distribution platform 7 outputs the heated air into two paths, one path of air is directly communicated with an inlet of the reaction kettle 10, and the other path of air is communicated with an inlet pipe of the oxygen-poor mixer 8;
the nitrogen compressor 6 is communicated with a nitrogen distribution table 9 and divides the output nitrogen into three paths, wherein one path of nitrogen is communicated with an inlet pipe of the lean oxygen mixer 8, the other path of nitrogen is communicated with an outlet pipe of the lean oxygen mixer 8, the third path of nitrogen is directly merged into an outlet tail gas header pipe of the reaction kettle 10, and the outlet pipe of the lean oxygen mixer 8 is communicated with an inlet of the reaction kettle 10;
the bottom and the upper portion of reation kettle 10 communicate there is the circulating line, and is provided with toluene circulating pump 11 and reaction heat taker 12 on this circulating line, the export tail gas house steward of reation kettle 10 disposes two sets of tail oxygen analysis appearance, and the tail gas through tail oxygen analysis appearance lets in oxidation tail gas export 15.
Wherein an air feeding cut-off valve 17 and a toluene feeding cut-off valve 18 are arranged at the inlet of the reaction kettle 10; the outlet pipe of the nitrogen mixer, the air mixer and the oxygen-poor mixer 8 is communicated with the inlet of the reaction kettle 10 through an air feeding cut-off valve 17, and the toluene feeding pump 4 is communicated with the inlet of the reaction kettle 10 through a toluene feeding cut-off valve 18; when the tail oxygen content reaches an interlocking value, the air feeding cut-off valve 17 is closed to cut off air feeding;
two sets of tail oxygen analysis appearance include first tail oxygen analysis appearance 13 and second tail oxygen analysis appearance 14, first tail oxygen analysis appearance 13 sets up in the front of the junction of third route nitrogen gas and reation kettle 10 export tail gas house steward with second tail oxygen analysis appearance 14.
Specifically, as shown in fig. 1, the control process of the tail oxygen content control device for the toluene oxidation process includes three aspects: air control, reaction kettle control and nitrogen protection control;
(1) air control
Air is compressed by an air compressor, enters an air heater 16, is heated and then is sent to an air distribution table 7, one path of air enters an oxygen-poor mixer 8 to prepare oxygen-poor air, and is used for smoothly initiating oxidation reaction in the air flow transition stage during the start, the other path of air enters the bottom of an oxidation reaction kettle according to the number of branches of the reaction kettle 10 to carry out normal oxidation reaction, and when the tail oxygen content reaches the interlocking value, an air valve is closed emergently to cut off air feeding.
Wherein the temperature of the feeding air is controlled to be 190 ℃ and 210 ℃, and the pressure is controlled to be 1.0-1.2 MPa.
(2) Reactor control
Toluene and air carry out oxidation reaction in parallelly connected oxidation reaction cauldron, the tower bottom liquid carries out forced circulation through the reaction circulating pump, a single reation kettle keeps certain toluene circulation volume, take away partly oxidation reaction thermal control circulation toluene temperature through reaction heat taker 12, get back to in the oxidation reactor again, along with the continuous oxidation reactor that enters into of toluene, the organic phase overflows to the reaction solution intermediate tank from the oxidation reaction cauldron, gaseous phase toluene, tail oxygen, inert gas are discharged from the top of the tower, dispose 2 tail oxygen analyzers on every reation kettle tail oxygen pipeline simultaneously.
Wherein the temperature of the reaction kettle 10 is controlled to 185-205 ℃, the pressure is controlled to be 0.9-1.1Mpa, the tail oxygen content of the normal reaction is controlled to be 0.5-2 percent, and the interlocking value of the tail oxygen content is 5 percent.
(3) Nitrogen protection control
And the nitrogen from the nitrogen compressor 6 enters a nitrogen distribution table 9, the nitrogen from the nitrogen distribution table is divided into three paths, one path of nitrogen enters a lean oxygen mixer 8 to prepare lean oxygen air, the other path of nitrogen is merged into an air inlet pipeline of the oxidation reaction kettle, the third path of nitrogen is directly merged into an oxidation tail gas main pipe, and when the tail oxygen content reaches an interlocking value, a nitrogen valve is opened emergently to cut in the nitrogen.
Wherein the nitrogen pressure is controlled to be 0.9-1.1 MPa.
In conclusion, through the design of the structures of the toluene feeding pump 4, the air nitrogen compressor, the oxygen-poor mixer 8, the nitrogen distribution table 9 and the like, one path of air divided into two paths enters the oxygen-poor mixer to prepare oxygen-poor air, the other path of reaction kettle branches in number enters the bottom of the oxidation reaction kettle to carry out normal oxidation reaction, and when the tail oxygen content reaches an interlocking value, the air valve is closed emergently to cut off air feeding, so that the oxygen content is controlled; divide into the nitrogen gas of three routes and be used for preparing lean oxygen air respectively, merge into oxidation reaction cauldron air inlet line, merge into oxidation tail gas house steward, thereby when oxidation tail gas house steward's tail oxygen content reached the interlock value, promptly open the nitrogen gas valve and cut into nitrogen gas and control nitrogen gas content, the utility model provides a tail oxygen content control mode in toluene air oxidation technology has improved oxidation reaction target product yield to guarantee that reation kettle tail oxygen content does not exceed standard, controlled the risk of blasting of device.
The control mode of the present application document is automatically controlled by a controller, the control mode of the controller can be realized by simple programming of a person skilled in the art, and belongs to the common knowledge in the field.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A toluene oxidation technology tail oxygen content controlling means which characterized in that includes:
a toluene feeding pump (4), an air compressor (5), a nitrogen compressor (6) and a reaction kettle (10);
the toluene feeding pump (4) is communicated with an inlet of the reaction kettle (10);
the air compressor (5) is communicated to the air distribution platform (7) through an air heater (16), the air distribution platform (7) outputs the heated air into two paths, one path of air is directly communicated with an inlet of the reaction kettle (10), and the other path of air is communicated with an inlet pipe of the oxygen-poor mixer (8);
the nitrogen compressor (6) is communicated with a nitrogen distribution table (9) and divides output nitrogen into three paths, wherein one path of nitrogen is communicated with an inlet pipe of the oxygen-poor mixer (8), the other path of nitrogen is communicated with an outlet pipe of the oxygen-poor mixer (8), the third path of nitrogen is directly merged into an outlet tail gas header pipe of the reaction kettle (10), and the outlet pipe of the oxygen-poor mixer (8) is communicated with an inlet of the reaction kettle (10);
the bottom and the upper portion intercommunication of reation kettle (10) have the circulating line, and be provided with toluene circulating pump (11) and reaction heat collector (12) on this circulating line, dispose two sets of tail oxygen analysis appearance on the export tail gas house steward of reation kettle (10), the tail gas through tail oxygen analysis appearance lets in oxidation tail gas export (15).
2. The toluene oxidation process tail oxygen content control device of claim 1, wherein: and a toluene inlet (1), an air inlet (2) and a nitrogen inlet (3) are respectively arranged on the toluene feeding pump (4), the air compressor (5) and the nitrogen compressor (6).
3. The toluene oxidation process tail oxygen content control device of claim 1, wherein: an air feeding cut-off valve (17) and a toluene feeding cut-off valve (18) are arranged at the inlet of the reaction kettle (10); the outlet pipe of nitrogen gas, air and poor oxygen blender (8) all the way communicates in the entry of reation kettle (10) through air feed trip valve (17), toluene charge pump (4) communicate in the entry of reation kettle (10) through toluene feed trip valve (18).
4. The toluene oxidation process tail oxygen content control device of claim 1, wherein: the two groups of tail oxygen analyzers comprise a first tail oxygen analyzer (13) and a second tail oxygen analyzer (14), wherein the first tail oxygen analyzer (13) and the second tail oxygen analyzer (14) are arranged in front of the joint of the third path of nitrogen and the outlet tail gas main pipe of the reaction kettle (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122329762.4U CN215693813U (en) | 2021-09-24 | 2021-09-24 | Toluene oxidation technology tail oxygen content controlling means |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122329762.4U CN215693813U (en) | 2021-09-24 | 2021-09-24 | Toluene oxidation technology tail oxygen content controlling means |
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| CN215693813U true CN215693813U (en) | 2022-02-01 |
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| CN202122329762.4U Active CN215693813U (en) | 2021-09-24 | 2021-09-24 | Toluene oxidation technology tail oxygen content controlling means |
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