CN211627369U - Device for automatically monitoring acetic anhydride content - Google Patents
Device for automatically monitoring acetic anhydride content Download PDFInfo
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- CN211627369U CN211627369U CN202020238247.8U CN202020238247U CN211627369U CN 211627369 U CN211627369 U CN 211627369U CN 202020238247 U CN202020238247 U CN 202020238247U CN 211627369 U CN211627369 U CN 211627369U
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- acetic anhydride
- controller
- content
- valve
- online refractometer
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- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 238000012544 monitoring process Methods 0.000 title description 4
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 239000006052 feed supplement Substances 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 22
- 238000007599 discharging Methods 0.000 description 11
- 229960000583 acetic acid Drugs 0.000 description 10
- 239000012362 glacial acetic acid Substances 0.000 description 8
- 238000005070 sampling Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004587 chromatography analysis Methods 0.000 description 2
- CCGKOQOJPYTBIH-UHFFFAOYSA-N ethenone Chemical compound C=C=O CCGKOQOJPYTBIH-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012417 linear regression Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model belongs to crude acetic anhydride production field, concretely relates to automatic device of control acetic anhydride content. The online refractometer is arranged on a bypass branched by a mixture circulating pipeline, the controller is electrically connected with the feed supplement regulating valve, the discharge valve and the online refractometer respectively, and the controller controls the feed supplement regulating valve and the discharge valve respectively according to output information of the online refractometer. Further, the controller is a PLC controller. The device has the advantages that the technical effects of immediate detection and automatic control of acetic anhydride in the production process are realized, the working efficiency of the device is high, the existing equipment can be realized without great transformation, and the economic benefit is obvious.
Description
Technical Field
The utility model belongs to crude acetic anhydride production field, concretely relates to automatic device of control acetic anhydride content.
Background
In the existing acetic anhydride production process, referring to fig. 2, ketene gas enters from the bottom of an absorption tower 1, glacial acetic acid enters from the top of the tower through a feed adjusting valve 5 and reacts with the ketene to obtain acetic anhydride, a circulating pump 2 pumps a mixture of the acetic anhydride and the acetic acid obtained by reaction in the absorption tower 1 into a circulating pipeline, the circulating pipeline is provided with a sampling port and a discharge port which are respectively controlled by valves, the acetic anhydride content can be discharged outwards when the acetic anhydride content is about 85%, otherwise, the discharged mixture stops flowing back into the absorption tower, the existing method is to measure the acetic anhydride content of the mixture obtained by the sampling port by using a chromatograph, the obtained result is fed back to production operators, the operators adjust the glacial acetic acid supply according to the result, and when the acetic anhydride content is too high, the glacial acetic acid supply is increased, otherwise, the glacial acetic acid supply is reduced, so as. The method has the advantages that the content of the mixture of acetic anhydride and acetic acid needs to be continuously monitored in the production process of the acetic anhydride, the process is continuously operated, although the accuracy of measuring the content of the acetic anhydride by adopting a chromatographic method is high, the measuring speed is low, the content change of the mixture of the acetic anhydride in a circulating pipeline cannot be immediately tracked, the manufacturing cost of the chromatographic measuring instrument is high, the glacial acetic acid supply is manually adjusted, and the working efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an automatic device of control acetic anhydride content to overcome the technical problem that current production technology cost is too high work efficiency is low.
The technical scheme for realizing the destination of the utility model is as follows,
the utility model provides an automatic device of control acetic anhydride content, includes feed supplement governing valve and bleeder valve, still includes online refractometer and controller, online refractometer sets up on the bypass by mixture circulating line branch, the controller is connected with feed supplement governing valve, bleeder valve, online refractometer electricity respectively, and the controller is controlled feed supplement governing valve and bleeder valve respectively according to the output information of online refractometer.
Further, the controller is a PLC controller.
When the device for automatically monitoring the content of the acetic anhydride is used, the on-line refractometer measures the refractive index of a mixture in a circulating pipeline, the content (concentration) of the acetic anhydride in the mixture is obtained according to the principle that a certain refractive index corresponds to a certain content (concentration) of the acetic anhydride, the controller judges whether the content of the acetic anhydride meets the standard of discharging, if the content of the acetic anhydride meets the standard, the controller sends an instruction to open the discharging valve for discharging, if the content of the acetic anhydride exceeds the range of the discharging standard, the controller sends an instruction to close the discharging valve and adjust the size of the feed supplement regulating valve until the content of the acetic anhydride meets the discharging standard, thereby realizing the technical effects of instant detection and automatic control of the acetic anhydride in the production process, the device has high working efficiency, the existing equipment can be realized without large transformation, and the economic benefit is obvious.
Drawings
FIG. 1 is a schematic structural diagram of an acetic anhydride manufacturing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a prior art acetic anhydride manufacturing apparatus;
FIG. 3 is a graph showing the relationship between the content of acetic anhydride and the refractive index of the mixture.
In the figure, 1. an absorption tower; 2. a circulation pump; 3. an online refractometer; 4. a discharge valve; 5. a material supplementing regulating valve; 6, a PLC controller; 7. and a sampling valve.
Detailed Description
The present invention will be described in detail with reference to examples.
The results of the mixture refractive index test and the chromatographic test results were compared in the laboratory, and the following relationship chart of acetic anhydride content and mixture refractive index was obtained using linear regression statistics, see fig. 3.
In fig. 3, the precision of the refractometer used in the chart test data experiment is 0.0001, and the precision of the actually installed online refractometer can reach 0.00001 even 0.0000001.
Fig. 3 shows that when the content of acetic anhydride is increased, the refractive index is also increased, in this embodiment, the standard content of acetic anhydride is 85%, the refractive index of the corresponding mixture is 1.3847, when the content of acetic anhydride is 80% -90%, the discharge standard is met, the refractive index of the mixture corresponding to 80% of acetic anhydride is 1.3835, and the refractive index of the mixture corresponding to 90% of acetic anhydride is 1.3859.
Referring to fig. 1, it is shown that the utility model discloses an automatic device of control acetic anhydride content is at the schematic diagram of actual production, an automatic device of control acetic anhydride content, including feed supplement governing valve 5 and bleeder valve 4, still include online refractometer 3 and PLC controller 6, online refractometer 3 sets up on by the branched side of mixture circulating line, PLC controller 6 respectively with feed supplement governing valve 5, bleeder valve 4, online refractometer 3 electricity is connected, the PLC controller is controlled feed supplement governing valve and bleeder valve respectively according to the output information of online refractometer 3.
When the device for automatically monitoring the content of the acetic anhydride is used, the online refractometer 3 measures the refractive index of a mixture in a circulating pipeline to obtain the refractive index n of the mixture, the PLC 6 judges whether n is between 1.3835 and 1.3859, if not, the content of the acetic anhydride in the mixture in the circulating pipeline does not accord with a discharging standard at the moment, the PLC 6 sends an instruction to close the discharging valve 4 and instructs to adjust the size of the material supplementing adjusting valve 5, the content of the acetic anhydride can be correspondingly changed until the content of the acetic anhydride accords with the discharging standard when the input of the glacial acetic acid is changed, if so, the content of the acetic anhydride in the mixture in the circulating pipeline accords with the discharging standard, the PLC 6 sends an instruction to open the discharging valve 4 to output the mixture, when the refractive index n is less than 1.3847, the PLC 6 sends an instruction to reduce the size of the material supplementing adjusting valve 5 and reduce the input of the glacial acetic acid to further improve, when n is greater than 1.3847, the PLC 6 sends an instruction to increase the size of the feeding regulating valve 5, increase the glacial acetic acid feeding amount and further reduce the acetic anhydride content until the acetic anhydride content is equal to the standard acetic anhydride content, so that the discharge port obtains a mixture meeting the standard acetic anhydride content, and the automatic control effect is achieved.
The device realizes the technical effects of instant detection and automatic control of acetic anhydride in the production process, has high working efficiency, can be realized without great transformation of the existing equipment, and has obvious economic benefit.
Compared with the existing acetic anhydride manufacturing equipment in the figure 2, the analysis sampling port and the sampling valve 7 thereof are reserved in the embodiment, and the arrangement is convenient for analyzing, comparing and correcting the online refractometer by using a chromatographic method. The device can automatically monitor the content of acetic anhydride by improving the circulating pipeline of the existing equipment to a certain extent, and has low modification cost and obvious obtained effect.
Claims (2)
1. The utility model provides an automatic device of control acetic anhydride content, includes feed supplement governing valve and bleeder valve, characterized in that, still includes online refractometer and controller, online refractometer sets up on the bypass by mixture circulating line branch, the controller is connected with feed supplement governing valve, bleeder valve, online refractometer electricity respectively, and the controller is controlled feed supplement governing valve and bleeder valve respectively according to the output information of online refractometer.
2. The apparatus according to claim 1, wherein the controller is a PLC controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020238247.8U CN211627369U (en) | 2020-03-02 | 2020-03-02 | Device for automatically monitoring acetic anhydride content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020238247.8U CN211627369U (en) | 2020-03-02 | 2020-03-02 | Device for automatically monitoring acetic anhydride content |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211627369U true CN211627369U (en) | 2020-10-02 |
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ID=72620141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020238247.8U Active CN211627369U (en) | 2020-03-02 | 2020-03-02 | Device for automatically monitoring acetic anhydride content |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211627369U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115318140A (en) * | 2022-08-08 | 2022-11-11 | 宁夏东和化工科技有限公司 | Method and device for automatically monitoring content of acetic anhydride |
-
2020
- 2020-03-02 CN CN202020238247.8U patent/CN211627369U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115318140A (en) * | 2022-08-08 | 2022-11-11 | 宁夏东和化工科技有限公司 | Method and device for automatically monitoring content of acetic anhydride |
| CN115318140B (en) * | 2022-08-08 | 2024-02-27 | 宁夏东和化工科技有限公司 | Method and device for automatically monitoring acetic anhydride content |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: GUANGXI JINMAO BIOCHEMICAL CO.,LTD. Assignor: GUANGXI JINYUAN BIOCHEMICAL INDUSTRIAL Co.,Ltd. Contract record no.: X2023980051718 Denomination of utility model: A device for automatic monitoring of acetic anhydride content Granted publication date: 20201002 License type: Common License Record date: 20231211 |