CN212174838U - Styrene synthesizer with on-line sampling - Google Patents
Styrene synthesizer with on-line sampling Download PDFInfo
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- CN212174838U CN212174838U CN202020478410.8U CN202020478410U CN212174838U CN 212174838 U CN212174838 U CN 212174838U CN 202020478410 U CN202020478410 U CN 202020478410U CN 212174838 U CN212174838 U CN 212174838U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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Abstract
The utility model relates to a take styrene synthesizer of online sample, including alkylation feed heater, blender, alkylation reactor and benzene recovery tower, ethylene and benzene after the heating of alkylation feed heater mix the back and get into in the alkylation reactor catalytic reaction in the blender, unnecessary benzene gets into pump recovery tower, and alkylation feed heater heat transfer medium is high-pressure steam, it has the sample pipeline to connect in parallel between alkylation feed heater and the alkylation reactor, cooler and sampling device have concatenated in proper order on the sample pipeline, and the valve is installed at the both ends of sample pipeline. The device can solve the defect that the styrene device in the prior art can not effectively monitor the free water.
Description
Technical Field
The utility model relates to a chemical production field, concretely relates to styrene synthesizer of online sample in area.
Background
The ethylbenzene unit of the styrene device is a technology for preparing ethylbenzene by EBMax liquid phase alkylation of Exxon Mobil. The fed ethylene and the excessive liquid phase benzene are reacted at the temperature of 190 ℃ and the pressure of 2.8MpaG and then are almost completely converted into ethylbenzene, and the recovered polyethylbenzene (mainly diethylbenzene) obtained in an ethylbenzene rectification system is selectively reacted with the excessive benzene at the temperature of 190 ℃ and the pressure of 2.8MpaG through an EBMax transalkylation catalyst and is converted into ethylbenzene again. Free water has influence on the activity of the alkylation catalyst, which can lead the catalyst to be reversibly inactivated, so that the water content in the raw material benzene feed of the protective bed of the alkylation reactor has strict requirements, and the index is less than or equal to 75 ppm. Raw material benzene enters a reactor after being heated by an alkylation feeding heater, heating steam is high-pressure steam, the pressure is 4.0MpaG & gt the benzene feeding pressure, and the risk that the steam enters a raw material benzene system due to the leakage of a tube array or a tube plate of the alkylation feeding heater exists, so that the alkylation catalyst is inactivated. The benzene pipeline from the tube pass of the alkylation feed heater to the inlet and the outlet of the alkylation reactor protective bed has no sampler, and no monitoring data is available for the moisture in the feed.
Disclosure of Invention
For solving the defect that the styrene device can not effectively monitor the free water in the prior art, the utility model aims to provide a styrene synthesizer with online sampling.
In order to achieve the above purpose, the utility model adopts the technical proposal that:
take styrene synthesizer of online sample, including alkylation feed heater, blender, alkylation reactor and benzene recovery tower, ethylene and benzene after the heating of alkylation feed heater mix the back and get into the catalytic reaction in the alkylation reactor in the blender, unnecessary benzene gets into pump recovery tower, and alkylation feed heater heat-transfer medium is high-pressure steam, it has the sample pipeline to connect in parallel between alkylation feed heater and the alkylation reactor, cooler and sampling device have concatenated in proper order on the sample pipeline, and the valve is installed at the both ends of sample pipeline.
Further, sampling device is including sample jar, sampling bottle, three-way valve connection sample pipeline and sampling bottle are passed through to the bottom of sample jar, three-way valve UNICOM sample pipeline and nitrogen gas purge mouth are passed through to the top of sample jar, benzene in the sample pipeline flows into sample jar and flows back to the sample pipeline from sample jar top three-way valve from sample jar bottom three-way valve.
Further, an emptying pipeline is inserted on the sampling bottle.
Further, a straight branch is arranged between the mixer and the benzene recovery tower, and a valve is arranged on the straight branch.
And a pressure gauge and an overflow valve are connected between the nitrogen purging port and the sampling tank.
After taking above technical scheme, the beneficial effects of the utility model are that: through the sampling pipeline of a pair of three-way valve control, can be at any time online closed sample in process of production, do not have the influence to process of production, utilize the cooperation of sample jar and sampling bottle, accomplish quantitative sample, unnecessary sample piece can continue to get into the reactor and continue to react. The technical scheme can fully, accurately and timely monitor the moisture in the feed, ensure the activity of the catalyst of the alkylation reactor and improve the production efficiency.
Drawings
FIG. 1 is a reaction scheme of the present invention;
fig. 2 is a schematic structural diagram of a sampling pipeline.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings:
as shown in fig. 1, the styrene synthesis apparatus with on-line sampling comprises an alkylation feed heater 1, a mixer 2, an alkylation reactor 3 and a benzene recovery tower 10, wherein ethylene and benzene heated by the alkylation feed heater 1 are mixed in the mixer 2 and then enter the alkylation reactor 3, the ethylene and the excessive liquid phase benzene are almost completely converted into ethylbenzene after reacting at the temperature of 190 ℃ and under the pressure of 2.8MpaG, and a product diethylbenzene after the ethylbenzene distillation is converted into ethylbenzene again through the reaction of an EBMax transalkylation catalyst and the excessive benzene. Finally, the excess benzene enters the pump recovery column 10. A straight branch is arranged between the mixer 2 and the benzene recovery tower 10, and a valve is arranged on the straight branch. The heat exchange medium of the alkylation feed heater 1 is high-pressure steam, when the tubes or tube plates of the alkylation feed heater 1 leak, the steam enters the alkylation reactor 3 along with benzene, and the activity of the alkylation catalyst is seriously influenced by the steam.
In order to monitor the steam leakage in time, a sampling pipeline 4 is connected in parallel between the alkylation feed heater 1 and the alkylation reactor 3, a cooler 5 and a sampling device are sequentially connected in series at the outlet of the alkylation feed heater on the sampling pipeline 4, and valves are installed at two ends of the sampling pipeline 4. When the sampling is needed, the valves at the two ends of the sampling pipeline are opened, the benzene raw material enters the sampling pipeline 4, then the valves at the two ends are closed, and the sample in the sampling pipeline 4 is sampled and analyzed, so that the online closed sampling is realized.
The sampling device consists of a sampling tank 6 and a sampling bottle 7. The three-way valve is installed respectively to the top and the bottom of sample jar 6, and the cooler 5 and sample bottle 7 are connected respectively to the three-way valve of sample jar bottom, and the output and the nitrogen gas of sample pipeline 4 sweep mouthful 8 are connected respectively to the three-way valve at sample jar 6 top. The sampling bottle 7 is a closed bottle, and the emptying pipeline 9 is inserted in the sampling bottle, so that the air pressure in the sampling bottle 7 is balanced when a sample in the sampling tank flows into the sampling bottle.
The working principle of the sampling pipeline is that when online sampling is needed, valves at two ends of the sampling pipeline 4 are opened, three-way valves at the upper end and the lower end of a sampling tank 6 are respectively connected with a cooler 5 and the sampling pipeline 4, heated benzene enters the sampling pipeline 4, is cooled by the cooler 5 and then enters the sampling tank 6, and after the sampling tank 6 is filled with cooled benzene, the valves at two ends of the sampling pipeline 4 are closed; sampling tank bottom three-way valve connection sampling bottle 7, 6 top three-way valve connection nitrogen gas of sampling tank sweep mouthful 8, and benzene in the sampling tank 6 gets into in the sampling bottle 7. And the three-way valves at the top and the bottom of the sampling tank 6 are closed to finish sampling. The sampling bottle 7 can be taken down for water detection. The whole sampling process is a closed process, has no influence on the production section, and can sample at any time.
Claims (5)
1. Take styrene synthesizer of online sample, including alkylation feed heater, blender, alkylation reactor and benzene recovery tower, ethylene and benzene after the heating of alkylation feed heater mix the back and enter alkylation reactor in catalytic reaction, unnecessary benzene gets into pump recovery tower, and alkylation feed heater heat transfer medium is high-pressure steam, its characterized in that, parallel connection has the sample pipeline between alkylation feed heater and the alkylation reactor, cooler and sampling device have concatenated in proper order on the sample pipeline, and the valve is installed at the both ends of sample pipeline.
2. The styrene synthesis device with on-line sampling function of claim 1, wherein the sampling device comprises a sampling tank and a sampling bottle, the bottom of the sampling tank is connected with a sampling pipeline and the sampling bottle through a three-way valve, the top of the sampling tank is communicated with the sampling pipeline and a nitrogen purging port through a three-way valve, and the benzene in the sampling pipeline flows into the sampling tank from the three-way valve at the bottom of the sampling tank and flows back to the sampling pipeline from the three-way valve at the top of the sampling tank.
3. The apparatus for synthesizing styrene with on-line sampling according to claim 2, wherein a vent pipe is inserted on the sampling bottle.
4. The apparatus for synthesizing styrene with on-line sampling according to claim 1, wherein a straight-through branch is provided between the mixer and the benzene recovery column, and a valve is installed on the straight-through branch.
5. The on-line sampling styrene synthesizer according to claim 2, wherein a pressure gauge and an overflow valve are connected between the nitrogen purge port and the sampling tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020478410.8U CN212174838U (en) | 2020-04-03 | 2020-04-03 | Styrene synthesizer with on-line sampling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020478410.8U CN212174838U (en) | 2020-04-03 | 2020-04-03 | Styrene synthesizer with on-line sampling |
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| Publication Number | Publication Date |
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| CN212174838U true CN212174838U (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020478410.8U Active CN212174838U (en) | 2020-04-03 | 2020-04-03 | Styrene synthesizer with on-line sampling |
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| CN (1) | CN212174838U (en) |
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2020
- 2020-04-03 CN CN202020478410.8U patent/CN212174838U/en active Active
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