CN217163255U - A rectification equipment that is arranged in N-methylaniline production methyl alcohol to retrieve - Google Patents
A rectification equipment that is arranged in N-methylaniline production methyl alcohol to retrieve Download PDFInfo
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- CN217163255U CN217163255U CN202220776169.6U CN202220776169U CN217163255U CN 217163255 U CN217163255 U CN 217163255U CN 202220776169 U CN202220776169 U CN 202220776169U CN 217163255 U CN217163255 U CN 217163255U
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- methylaniline
- methyl alcohol
- rectification system
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 198
- AFBPFSWMIHJQDM-UHFFFAOYSA-N N-methylaniline Chemical compound CNC1=CC=CC=C1 AFBPFSWMIHJQDM-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 238000011084 recovery Methods 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000004062 sedimentation Methods 0.000 claims abstract description 11
- 238000000605 extraction Methods 0.000 claims description 40
- 239000002699 waste material Substances 0.000 abstract description 11
- 238000004065 wastewater treatment Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 9
- 239000002351 wastewater Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000009834 vaporization Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005804 alkylation reaction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses a rectifying equipment that is arranged in N-methylaniline to produce methyl alcohol recovery, establish ties through elementary rectification system and second grade rectification system, wherein the methyl alcohol content in elementary rectification system aim at control tower cauldron waste liquid is below 0.3%, with the requirement of intaking that satisfies follow-up sedimentation separation workshop section waste water treatment, the methyl alcohol content in second grade rectification system aim at control tower top recovery methyl alcohol liquid is above 99.5%, with satisfy the requirement of batching participation N-methylaniline production reaction together with fresh methyl alcohol, make N-methylaniline serialization production technology can normal operating, the production efficiency of N-methylaniline has been showing to be improved; the utility model discloses a rectification equipment that is arranged in N-methylaniline to produce methyl alcohol to retrieve, structural design is ingenious reasonable, and it is high to use the feasibility of implementing, and economic practicality is strong.
Description
Technical Field
The utility model relates to the technical field of chemical equipment, concretely relates to a rectification equipment that is arranged in methyl alcohol recovery in N-methylaniline production.
Background
Methanol is an important chemical product. In the process of methanol production, the distillation residual liquid containing methanol discharged from the bottom of the rectifying tower is generally called methanol waste water. If the methanol wastewater is directly discharged into a water body, the environment can be seriously polluted and damaged. The common methanol wastewater treatment method is a vaporization method, and the vaporization method uses a common waste heat boiler in production as a heat source according to the physical characteristic of low boiling point of alcohol substances, vaporizes low boiling point organic matters in the wastewater, and then inputs the vaporized low boiling point organic matters into a gas making furnace for making raw material gas, thereby achieving the dual purposes of wastewater treatment and raw material recovery. The vaporization method has the following problems in the methanol wastewater treatment process: (1) the methanol wastewater has obvious corrosion to the pressure vessel made of carbon steel; (2) the circulating water of the gas-making furnace gas washing tower is seriously polluted; (3) the methanol wastewater contains various components, and the vaporization degree and the efficiency are different, so that the quality of gas-making gas is adversely affected; (4) the waste heat boiler water needs to be discharged regularly, so that a small amount of methanol wastewater enters a drainage pipeline, and secondary pollution is caused.
To the drawback of methanol wastewater is handled to the vaporization method, chinese utility model patent No. 201320068206.9 provides a methanol recovery rectifying column, has realized the serialization operation, has improved methanol recovery efficiency, has practiced thrift the material, the cost is reduced. However, in the production process of N-methylaniline, the recovered methanol content obtained at the top of the rectifying tower is more than 99.5 percent and can be mixed with fresh methanol to participate in the reaction, and meanwhile, the methanol content in the waste liquid obtained at the bottom of the rectifying tower is less than 0.3 percent to meet the requirements of the subsequent settling separation section, otherwise, the settling separation section cannot normally operate, the water inlet of a sewage station seriously exceeds the standard, bacteria die, the sewage cannot be discharged, and a settling separation device is paralyzed. The utility model discloses a rectifying column is retrieved to methyl alcohol in the patent can only satisfy the concentration requirement that the top of the tower retrieved methyl alcohol in the production process of N-methylaniline, perhaps satisfies the processing requirement of tower cauldron waste liquid, therefore this rectifying column is retrieved to methyl alcohol has certain use limitation.
The utility model provides a drawback to above-mentioned methyl alcohol recovery rectifying column exists provides a rectifying equipment that is arranged in N-methylaniline production methyl alcohol to retrieve to solve above-mentioned technical problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art, the rectification equipment for recovering methanol in the production of N-methylaniline is provided, the rectification equipment is connected with a secondary rectification system in series through a primary rectification system, wherein the primary rectification system aims at controlling the methanol content in the tower kettle waste liquid to be below 0.3 percent so as to meet the water inlet requirement of the subsequent sedimentation separation section waste water treatment, the secondary rectification system aims at controlling the methanol content in the recovered methanol liquid at the top of the tower to be above 99.5 percent so as to meet the requirement of burdening and participating in the production reaction of the N-methylaniline together with fresh methanol, so that the continuous production process of the N-methylaniline can normally run, and the production efficiency of the N-methylaniline is obviously improved; the utility model discloses a rectification equipment that is arranged in N-methylaniline to produce methyl alcohol to retrieve, structural design is ingenious reasonable, and the application is implemented the feasibility height, and economic practicality is strong.
In order to achieve the purpose, the technical scheme of the utility model is to design a rectification equipment for methanol recovery in N-methylaniline production, which is formed by connecting a primary rectification system and a secondary rectification system in series, wherein a tower kettle extraction port of the primary rectification system is connected with a sedimentation separation working section, and a tower top extraction port of the secondary rectification system is connected with an N-methylaniline reaction working section.
The utility model discloses a rectifying equipment that is arranged in methyl alcohol recovery in N-methylaniline production, establish ties through elementary rectification system and second grade rectification system, wherein the methyl alcohol content in elementary rectification system aim at control tower cauldron waste liquid is below 0.3%, with the requirement of intaking that satisfies follow-up sedimentation separation workshop section waste water treatment, the methyl alcohol content in second grade rectification system aim at control tower top recovery methyl alcohol liquid is above 99.5%, with the requirement of carrying out batching together with fresh methyl alcohol and participating in N-methylaniline production reaction, make N-methylaniline serialization production technology can normal operating, the production efficiency of N-methylaniline has been showing to be improved; the utility model discloses a rectification equipment that is arranged in N-methylaniline to produce methyl alcohol to retrieve, structural design is ingenious reasonable, and the application is implemented the feasibility height, and economic practicality is strong.
The preferable technical scheme is that the primary rectification system comprises a first rectification tower, a first condenser and a first reboiler, the secondary rectification system comprises a second rectification tower, a second condenser and a second reboiler, a tower top extraction outlet of the first rectification tower is connected with the first condenser through a pipeline, a liquid outlet at the bottom of the first condenser is connected with a feed inlet of the second rectification tower through a first tower top extraction pipe, the first tower top extraction pipe is connected back to the first rectification tower through a first return pipe, a tower bottom extraction outlet of the first rectification tower is connected with a sedimentation separation section through a first tower bottom extraction pipe, a tower top extraction outlet of the second rectification tower is connected with the second condenser through a pipeline, a liquid outlet at the bottom of the second condenser is connected with an N-methylaniline reaction section through a second tower top extraction pipe, and the second tower top extraction pipe is connected back to the second rectification tower return pipe through a second tower top extraction pipe, and a tower kettle extraction outlet of the second rectifying tower is connected with a feed inlet of the first rectifying tower through a second tower kettle extraction pipe. The utility model discloses a rectification equipment that is arranged in N-methylaniline to produce methyl alcohol and retrieves, each subassembly assembly is simple reasonable to the pipeline is arranged clearly rationally, has ensured the reliability and the stability of equipment, has improved the recovery and recycle efficiency of methyl alcohol, has practiced thrift the material, the cost is reduced.
In a further preferable technical scheme, the first tower kettle extraction pipe is connected with a first reboiler in parallel and is connected back to the first rectifying tower, and the second tower kettle extraction pipe is connected with a second reboiler in parallel and is connected back to the second rectifying tower.
The utility model has the advantages and the beneficial effects that:
1. the utility model discloses a rectifying equipment that is arranged in methyl alcohol recovery in N-methylaniline production, establish ties through elementary rectification system and second grade rectification system, wherein the methyl alcohol content in elementary rectification system aim at control tower cauldron waste liquid is below 0.3%, with the requirement of intaking that satisfies follow-up sedimentation separation workshop section waste water treatment, the methyl alcohol content in second grade rectification system aim at control tower top recovery methyl alcohol liquid is above 99.5%, with the requirement of carrying out batching together with fresh methyl alcohol and participating in N-methylaniline production reaction, make N-methylaniline serialization production technology can normal operating, the production efficiency of N-methylaniline has been showing to be improved; the utility model discloses a rectification equipment that is arranged in N-methylaniline to produce methyl alcohol to retrieve, structural design is ingenious reasonable, and the application is implemented the feasibility height, and economic practicality is strong.
2. The utility model discloses a rectification equipment that is arranged in N-methylaniline to produce methyl alcohol and retrieves, each subassembly assembly is simple reasonable to the pipeline is arranged clearly rationally, has ensured the reliability and the stability of equipment, has improved the recovery and recycle efficiency of methyl alcohol, has practiced thrift the material, the cost is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a rectification apparatus for recovering methanol in the production of N-methylaniline.
In the figure: 1. a first rectification column; 2. a first condenser; 3. a first reboiler; 4. a second rectification column; 5. a second condenser; 6. a second reboiler; 11. a first tower kettle extraction pipe; 21. a first return pipe; 22. a first overhead withdrawal pipe; 41. a second tower kettle extraction pipe; 51. a second return pipe; 52. and a second tower top output pipe.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Examples
As shown in figure 1, the utility model relates to a rectification equipment for methyl alcohol recovery in N-methylaniline production, which is formed by connecting a primary rectification system and a secondary rectification system in series, wherein a tower kettle extraction port of the primary rectification system is connected with a sedimentation separation working section, and a tower top extraction port of the secondary rectification system is connected with an N-methylaniline reaction working section.
Preferably, the primary rectification system comprises a first rectification tower 1, a first condenser 2 and a first reboiler 3, the secondary rectification system comprises a second rectification tower 4, a second condenser 5 and a second reboiler 6, the tower top extraction outlet of the first rectification tower 1 is connected with the first condenser 2 through a pipeline, the liquid outlet at the bottom of the first condenser 2 is connected with the feed inlet of the second rectification tower 4 through a first tower top extraction pipe 22, the first tower top extraction pipe 22 is further connected back to the first rectification tower 1 through a first return pipe 21, the tower kettle extraction outlet of the first rectification tower 1 is connected into the sedimentation separation section through a first tower kettle extraction pipe 11, the tower top extraction outlet of the second rectification tower 4 is connected with the second condenser 5 through a pipeline, the liquid outlet at the bottom of the second condenser 5 is connected with the N-methylaniline reaction section through a second tower top extraction pipe 52, the second tower top output pipe 52 is also connected back to the second rectifying tower 4 through a second return pipe 51, and the tower kettle output port of the second rectifying tower 4 is connected with the feed inlet of the first rectifying tower 1 through a second tower kettle output pipe 41.
Further preferably, the first tower bottom extraction pipe 11 is connected with the first reboiler 3 and is connected back to the first rectifying tower 1, and the second tower bottom extraction pipe 41 is connected with the second reboiler 6 and is connected back to the second rectifying tower 4.
The utility model relates to a theory of operation that is arranged in rectification equipment of methyl alcohol recovery among N-methylaniline production:
when the device works, materials are fed into a first rectifying tower 1 from a feeding hole through a pump, the materials are gasified after being heated, the gasified methanol materials are subjected to material transfer and finally enter a first condenser 2 through a pipeline at the top of the first rectifying tower 1, one part of condensed liquid enters the first rectifying tower 1 again through a first return pipe 21 to be refluxed, the other part of the condensed liquid enters a second rectifying tower 4 after being extracted from the top of the tower, waste liquid discharged from the tower kettle of the first rectifying tower 1 is heated through a first reboiler 3, volatile organic components contained in the waste liquid are gasified and then returned to the tower, heat is circularly exchanged and the materials are transferred, and the waste liquid discharged from the tower kettle of the first rectifying tower 1 is connected to a settling separation section to be subjected to wastewater treatment and then is discharged; the liquid that gets into in second rectifying column 4, through the gasification after the heating, the methanol after the gasification gets into second condenser 5 through the pipeline at second rectifying column 4 top, liquid after the condensation partly gets into second rectifying column 4 again through second back flow pipe 51 and flows back, another part directly gets into N-methylaniline reaction workshop section after the top of the tower is extracted and carries out the batching, the waste liquid that second rectifying column 4 cauldron was discharged passes through second reboiler 6 heating, make in the tower is returned again after the gasification of the volatile organic component that contains wherein, the circulation absorbs the heat transfer and carries out the material transfer, the waste liquid that second rectifying column 4 cauldron was discharged inserts in first rectifying column 1, the circulation is carried out recycle.
The utility model relates to a rectifying equipment that is arranged in methyl alcohol of N-methylaniline production to retrieve has following advantage:
(1) the traditional one-tower rectification structure is changed into a two-tower rectification structure, the methanol content in a tower kettle is controlled to be below 0.3 percent in a first rectification tower, and the stability of a subsequent sedimentation separation working section is ensured, so that the wastewater entering a sewage device is ensured to reach the water inlet standard of treatment;
(2) the second rectifying tower is used for rectifying the high-content methanol aqueous solution extracted from the top of the first rectifying tower again, so that the extracted methanol meets the raw material standard, the influence of the water content in the methanol on the conversion rate and yield of the alkylation reaction and the catalyst is reduced as much as possible, and the production efficiency of the N-methylaniline is greatly improved;
(3) through the improvement of the rectifying equipment, the continuous production process of the N-methylaniline can normally run, and the reliability and the stability of the rectifying equipment for recovering the methanol in the production of the N-methylaniline are improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and embellishments can be made without departing from the technical principle of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention.
Claims (2)
1. A rectification device for recovering methanol in N-methylaniline production is characterized by being formed by connecting a primary rectification system and a secondary rectification system in series, wherein a tower kettle extraction port of the primary rectification system is connected to a sedimentation separation working section, and a tower top extraction port of the secondary rectification system is connected to an N-methylaniline reaction working section;
the primary rectification system comprises a first rectification tower (1), a first condenser (2) and a first reboiler (3), the secondary rectification system comprises a second rectification tower (4), a second condenser (5) and a second reboiler (6), the tower top extraction outlet of the first rectification tower (1) is connected with the first condenser (2) through a pipeline, the liquid outlet at the bottom of the first condenser (2) is connected with the feed inlet of the second rectification tower (4) through a first tower top extraction pipe (22), the first tower top extraction pipe (22) is connected back to the first rectification tower (1) through a first return pipe (21), the tower bottom extraction outlet of the first rectification tower (1) is connected to a sedimentation separation section through a first tower bottom extraction pipe (11), the tower top extraction outlet of the second rectification tower (4) is connected with the second condenser (5) through a pipeline, a liquid outlet at the bottom of the second condenser (5) is connected with the N-methylaniline reaction section through a second tower top extraction pipe (52), the second tower top extraction pipe (52) is also connected back to the second rectifying tower (4) through a second return pipe (51), and a tower kettle extraction outlet of the second rectifying tower (4) is connected with a feed inlet of the first rectifying tower (1) through a second tower kettle extraction pipe (41).
2. The rectification apparatus for methanol recovery in the production of N-methylaniline according to claim 1, wherein the first bottom withdrawal pipe (11) is connected with the first reboiler (3) and connected back to the first rectification column (1), and the second bottom withdrawal pipe (41) is connected with the second reboiler (6) and connected back to the second rectification column (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220776169.6U CN217163255U (en) | 2022-04-06 | 2022-04-06 | A rectification equipment that is arranged in N-methylaniline production methyl alcohol to retrieve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220776169.6U CN217163255U (en) | 2022-04-06 | 2022-04-06 | A rectification equipment that is arranged in N-methylaniline production methyl alcohol to retrieve |
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| Publication Number | Publication Date |
|---|---|
| CN217163255U true CN217163255U (en) | 2022-08-12 |
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| CN202220776169.6U Active CN217163255U (en) | 2022-04-06 | 2022-04-06 | A rectification equipment that is arranged in N-methylaniline production methyl alcohol to retrieve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116966621A (en) * | 2023-09-12 | 2023-10-31 | 山西振钢生物科技股份有限公司 | Continuous rectifying device of sebacic acid |
-
2022
- 2022-04-06 CN CN202220776169.6U patent/CN217163255U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116966621A (en) * | 2023-09-12 | 2023-10-31 | 山西振钢生物科技股份有限公司 | Continuous rectifying device of sebacic acid |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230820 Address after: No. 1 Weihua Road, Xinbei District, Changzhou City, Jiangsu Province, 213127 Patentee after: Jiangsu Jingying Chemical New Materials Co.,Ltd. Address before: 213001 No. 1, Weihua Road, chemical industry park, Xinbei District, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU BAOLONG CHEMICALS Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 1 Weihua Road, Xinbei District, Changzhou City, Jiangsu Province, 213127 Patentee after: Jiangsu Jingying New Materials Co.,Ltd. Address before: No. 1 Weihua Road, Xinbei District, Changzhou City, Jiangsu Province, 213127 Patentee before: Jiangsu Jingying Chemical New Materials Co.,Ltd. |