CN210620665U - System for removing N-nitroso compound from pendimethalin crude product - Google Patents
System for removing N-nitroso compound from pendimethalin crude product Download PDFInfo
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- CN210620665U CN210620665U CN201921397893.2U CN201921397893U CN210620665U CN 210620665 U CN210620665 U CN 210620665U CN 201921397893 U CN201921397893 U CN 201921397893U CN 210620665 U CN210620665 U CN 210620665U
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Abstract
The utility model discloses a take off system of N-nitroso compound from pendimethalin crude, including reation kettle, hydrochloric acid storage tank, 3-pentanone storage tank, pendimethalin crude storage tank, sulfamic acid storage tank, still include solid liquid mixer, the entry of star type unloading valve is connected through flange joint spare to the discharge gate of sulfamic acid storage tank, and the second feed inlet of pipe connection solid liquid mixer is passed through in the export of star type unloading valve, and the discharge gate of solid liquid mixer even has the thick liquids pump through the pipeline, and the export of thick liquids pump is passed through pipeline and reation kettle intercommunication, is equipped with branch road pipeline intercommunication on the pipeline between thick liquids pump and the reation kettle the feed back of solid liquid mixer. Application the utility model discloses, before getting into reation kettle, mix the back with pendimethalin crude and sulfamic acid, through pipeline input reation kettle, drop hydrochloric acid, 3-pentanone in to reation kettle through the pipeline simultaneously, effectively avoid steam and sulfamic acid direct contact in the reation kettle, the moisture absorption of sulfamic acid is rotten, stop to throw the jam of expecting the pipeline.
Description
Technical Field
The utility model belongs to the technical field of chemical industry equipment, a pendimethalin production facility is related to, concretely relates to take off system of N-nitroso compound from pendimethalin crude.
Background
Pendimethalin (pendimethalin) an aniline herbicide developed by cyanamide usa (now ascribed to basf). The original drug is orange yellow crystal, has low solubility in water with the melting point of 56-58 ℃, is easy to dissolve in chlorinated hydrocarbon and aromatic hydrocarbon solvents, and is stable to acid and alkali.
At present, the pendimethalin production process mainly uses N- (3-amyl) -2, 3-dimethylaniline as a raw material and uses concentrated nitric acid as a nitrating agent. During the nitration process, N-NO product is easily formed by amino N atom (US 4136117), so that there is a process of removing nitroso after nitration during the production process, and the obtained product is concentrated to obtain crude product of pendimethalin after post-treatment. It is noteworthy that N-NO-conversion products are carcinogenic and that these N-nitroso compounds are described in adv. cancer. Res. 1967.10:163 as having carcinogenic effects in many animals. These N-nitroso compounds were subsequently confirmed to have carcinogenic effects on humans in Nature.1970.225: 21. The characteristics that N-nitroso compounds generated in the process are difficult to volatilize, are difficult to degrade in soil, are easy to be retained in the soil and absorbed by plants and the like are recorded in chemical examination Vol.37.No.4, Apr.2001.
The current denitritification process mainly adopts a conversion method, wherein the conversion method mainly decomposes and converts the content of N-nitroso compounds into target products through chemical reaction, and the reaction is usually carried out in the presence of strong acid (HCl or HBr), and the reaction equation is as follows:
because the reaction is a reversible reaction, in order to improve the conversion rate and complete the reaction, sulfamic acid is usually added into a reaction system, at present, hydrochloric acid and 3-pentanone are dropwise added into a pendimethalin crude product in production, and meanwhile, sulfamic acid is continuously added, has stable property at normal temperature and in a dry environment, but is easy to absorb moisture and deteriorate under the condition of heating, and is attached to the inner wall of a pipeline to influence feeding.
SUMMERY OF THE UTILITY MODEL
To prior art not enough, the utility model aims to provide a take off system of N-nitroso compound from pendimethalin crude, the application the utility model discloses, before getting into reation kettle, under the normal atmospheric temperature, mix the back with pendimethalin crude and sulfamic acid, through pipeline input reation kettle, drop hydrochloric acid, 3-pentanone in to reation kettle through the pipeline simultaneously, effectively avoid steam and sulfamic acid direct contact in the reation kettle, stop to throw the jam of material pipeline and the moisture absorption of sulfamic acid and deteriorate.
The utility model discloses a realize through following technical scheme:
the system for removing the N-nitroso compound from the pendimethalin crude product comprises a reaction kettle, a hydrochloric acid storage tank, a 3-pentanone storage tank, a pendimethalin crude product storage tank, an sulfamic acid storage tank and a solid-liquid mixer, wherein the hydrochloric acid storage tank and the 3-pentanone storage tank are positioned above the reaction kettle and communicated with the reaction kettle through pipelines, the pendimethalin crude product storage tank is communicated with a first feed inlet of the solid-liquid mixer through a pipeline, the sulfamic acid storage tank is positioned right above the solid-liquid mixer, a discharge port of the sulfamic acid storage tank is connected with an inlet of a star-shaped discharging valve through a flange connecting piece, an outlet of the star-shaped discharging valve is connected with a second feed inlet of the solid-liquid mixer through a pipeline, a discharge port of the solid-liquid mixer is connected with a slurry pump through a pipeline, an outlet of the slurry pump is communicated with, and a branch pipeline is arranged on a pipeline between the slurry pump and the reaction kettle and is communicated with a feed back port of the solid-liquid mixer, and a flow control valve is arranged on the branch pipeline.
The utility model discloses a further improvement scheme does:
flow control valves are arranged on a pipeline between the hydrochloric acid storage tank and the reaction kettle, a pipeline between the 3-pentanone storage tank and the reaction kettle, a pipeline between the pendimethalin crude product storage tank and the solid-liquid mixer and a pipeline between the slurry pump and the reaction kettle.
Furthermore, sight glasses are arranged on a pipeline between the hydrochloric acid storage tank and the reaction kettle, a pipeline between the 3-pentanone storage tank and the reaction kettle, a pipeline between the pendimethalin crude product storage tank and the solid-liquid mixer, and a pipeline between the slurry pump and the reaction kettle.
Furthermore, a butterfly valve is arranged on a pipeline between the sulfamic acid storage tank and the solid-liquid mixer.
Furthermore, the lower part of the sulfamic acid storage tank is a cone.
Furthermore, the lower part of the solid-liquid mixer is a cone.
Further, the system also comprises a heat exchanger, and an inlet and an outlet of the heat exchanger are communicated with the reaction kettle through a pipeline.
Further, the reaction kettle is provided with a jacket and a stirring device.
Further, reation kettle's bottom is equipped with the discharge gate, the discharge gate is equipped with overflow pipe, overflow pipe's drain hole highly be located reation kettle cover below, the 2/3 top of locating of the cauldron body.
Furthermore, the overflow pipeline is provided with a ball valve and a sight glass.
The utility model has the advantages that:
the utility model discloses a reaction system, before getting into reation kettle, at normal atmospheric temperature, mix the back with pendimethalin crude and sulfamic acid, through pipeline input reation kettle, drop hydrochloric acid, 3-pentanone in to reation kettle through the pipeline simultaneously, effectively avoid steam and sulfamic acid direct contact in the reation kettle, stop to throw the jam of material pipeline and the moisture absorption of sulfamic acid is rotten.
The utility model discloses in, solid-liquid mixer's discharge gate even has the thick liquids pump through the pipeline, the export of thick liquids pump pass through the pipeline with reation kettle intercommunication, the thick liquids pump with be equipped with branch road pipeline intercommunication on the pipeline between the reation kettle the feed back mouth of solid-liquid mixer utilizes the thick liquids pump to form vacuum negative pressure in solid-liquid mixer, and rethread branch road pipeline forms the circulation, mixes sulfamic acid solid and pendimethalin crude liquid intensive mixing in the solid-liquid mixer.
The utility model discloses in, the charge-in pipeline who links to each other with reation kettle all is equipped with flow control valve, is convenient for throw the material according to reaction ratio ration, throws promptly and reacts promptly, improves production efficiency.
The utility model discloses in, reation kettle's bottom is equipped with the discharge gate, the discharge gate is equipped with overflow pipeline, overflow pipeline's drain hole highly is located 2/3 tops of the reation kettle cover below, the cauldron body, when the reaction goes on, incessantly divide the product from finished product overflow pipeline, realize serialization production, further improve production efficiency.
Drawings
FIG. 1 is a schematic view of the present invention;
the device comprises a reaction kettle 1, a jacket 101, a stirring device 102, a discharge hole 103-A, a kettle cover 104, a kettle body 105, a hydrochloric acid 2-storage tank, a pentanone 3-3-storage tank, a pendimethalin crude product storage tank, a sulfamic acid 5-storage tank, a solid-liquid mixer 6, a first feed inlet 61-a second feed inlet 62-a discharge hole 63-B, a feed back 64-a feed back hole, a star-shaped blanking valve 7-a slurry pump 8-a branch pipeline 9-a flow control valve A, a flow control valve B11-a flow control valve B, a sight glass A12-a butterfly valve 13-a heat exchanger 14-a overflow pipeline 15-a ball valve 17-a sight glass B.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in figure 1, the utility model relates to a system for removing N-nitroso compound from pendimethalin crude product, which comprises a reaction kettle 1, a hydrochloric acid storage tank 2, a 3-pentanone storage tank 3, a pendimethalin crude product storage tank 4, an aminosulfonic acid storage tank 5, and a solid-liquid mixer 6, wherein the hydrochloric acid storage tank 2 and the 3-pentanone storage tank 3 are positioned above the reaction kettle 1 and communicated with the reaction kettle 1 through a pipeline, the pendimethalin crude product storage tank 4 is communicated with a first feed inlet 61 of the solid-liquid mixer 6 through a pipeline, the aminosulfonic acid storage tank 5 is positioned right above the solid-liquid mixer 6, a discharge port of the aminosulfonic acid storage tank 5 is connected with an inlet of a star-shaped baiting valve 7 through a flange connector, an outlet of the star-shaped baiting valve 7 is connected with a second feed inlet 62 of the solid-liquid mixer 6 through a pipeline, a discharge port 63 of the solid-liquid mixer 6 is connected with a slurry pump, a branch pipeline 9 is arranged on a pipeline between the slurry pump 8 and the reaction kettle 1 and is communicated with a feed back port 64 of the solid-liquid mixer 6, and a flow control valve A is arranged on the branch pipeline 9.
Flow control valves B and sight glasses A are arranged on a pipeline between the hydrochloric acid storage tank 2 and the reaction kettle 1, a pipeline between the 3-pentanone storage tank 3 and the reaction kettle 1, a pipeline between the pendimethalin crude product storage tank 4 and the solid-liquid mixer 6, and a pipeline between the slurry pump 8 and the reaction kettle 1. A butterfly valve 13 is arranged on a pipeline between the sulfamic acid storage tank 5 and the solid-liquid mixer 6. The lower parts of the sulfamic acid storage tank 5 and the solid-liquid mixer 6 are conical bodies. The system in the embodiment further comprises a heat exchanger 14, and an inlet and an outlet of the heat exchanger 14 are communicated with the reaction kettle 1 through a pipeline. The reaction kettle 1 is provided with a jacket 101, and the reaction kettle 1 is provided with a stirring device 102. The bottom of the reaction kettle 1 is provided with a B discharge hole 103, the B discharge hole 103 is provided with an overflow pipeline 15, and the height of a discharge hole of the overflow pipeline 15 is positioned between the lower part of the kettle cover 104 of the reaction kettle 1 and the upper part of the 2/3 position of the kettle body 105. The overflow pipe 15 is provided with a ball valve 16 and a sight glass B.
The working principle is as follows: setting flow control valves according to the process requirements, controlling the feeding ratio, starting a stirring device 102 of the reaction kettle 1, exchanging heat by a jacket 101, mixing sulfamic acid and the pendimethalin crude product through a solid-liquid mixer 6, inputting the mixture into the reaction kettle through a slurry pump 8, and simultaneously dropwise adding hydrochloric acid and 3-pentanone, namely feeding and reacting. After the reaction is carried out for a period of time, the materials after the reaction pass through the overflow pipeline 15, the standing and layering are completed in the overflow pipeline, and the oil layer and the finished pendimethalin are collected through the outlet of the overflow pipeline 15, so that the continuous production is realized, and the production efficiency is further improved.
Claims (10)
1. The system for removing the N-nitroso compound from the pendimethalin crude product comprises a reaction kettle (1), a hydrochloric acid storage tank (2), a 3-pentanone storage tank (3), a pendimethalin crude product storage tank (4) and an sulfamic acid storage tank (5), and is characterized by further comprising a solid-liquid mixer (6), wherein the hydrochloric acid storage tank (2) and the 3-pentanone storage tank (3) are positioned above the reaction kettle (1) and communicated with the reaction kettle (1) through pipelines, the pendimethalin crude product storage tank (4) is communicated with a first feeding hole (61) of the solid-liquid mixer (6) through a pipeline, the sulfamic acid storage tank (5) is positioned right above the solid-liquid mixer (6), a discharging hole of the sulfamic acid storage tank (5) is connected with an inlet of a star-shaped blanking valve (7) through a flange connector, an outlet of the star-shaped blanking valve (7) is connected with a second feeding hole (62) of the solid-liquid mixer (6) through a pipeline, discharge gate (63) of solid-liquid mixer (6) even have thick liquids pump (8) through the pipeline, the export of thick liquids pump (8) pass through the pipeline with reation kettle (1) intercommunication, thick liquids pump (8) with be equipped with branch road pipeline (9) intercommunication on the pipeline between reation kettle (1) the A feed back (64) of solid-liquid mixer (6), be equipped with flow control valve A (10) on branch road pipeline (9).
2. The system for removing N-nitroso compounds from crude pendimethalin as claimed in claim 1, wherein: flow control valves B (11) are arranged on a pipeline between the hydrochloric acid storage tank (2) and the reaction kettle (1), a pipeline between the 3-pentanone storage tank (3) and the reaction kettle (1), a pipeline between the pendimethalin crude product storage tank (4) and the solid-liquid mixer (6), and a pipeline between the slurry pump (8) and the reaction kettle (1).
3. The system for removing N-nitroso compounds from crude pendimethalin as claimed in claim 1, wherein: and sight glasses A (12) are arranged on a pipeline between the hydrochloric acid storage tank (2) and the reaction kettle (1), a pipeline between the 3-pentanone storage tank (3) and the reaction kettle (1), a pipeline between the pendimethalin crude product storage tank (4) and the solid-liquid mixer (6) and a pipeline between the slurry pump (8) and the reaction kettle (1).
4. The system for removing N-nitroso compounds from crude pendimethalin as claimed in claim 1, wherein: a butterfly valve (13) is arranged on a pipeline between the sulfamic acid storage tank (5) and the solid-liquid mixer (6).
5. The system for removing N-nitroso compounds from crude pendimethalin as claimed in claim 1, wherein: the lower part of the sulfamic acid storage tank (5) is a cone.
6. The system for removing N-nitroso compounds from crude pendimethalin as claimed in claim 1, wherein: the lower part of the solid-liquid mixer (6) is a cone.
7. The system for removing N-nitroso compounds from a crude product of pendimethalin as claimed in claim 1, wherein: the system also comprises a heat exchanger (14), and an inlet and an outlet of the heat exchanger (14) are communicated with the reaction kettle (1) through pipelines.
8. The system for removing N-nitroso compounds from a crude product of pendimethalin as claimed in claim 1, wherein: the reaction kettle (1) is provided with a jacket (101), and the reaction kettle (1) is provided with a stirring device (102).
9. The system for removing N-nitroso compounds from a crude product of pendimethalin according to any one of claims 1 or 8, wherein: the bottom of reation kettle (1) is equipped with B discharge gate (103), B discharge gate (103) are equipped with overflow pipe (15), the height of the drain hole of overflow pipe (15) is located reation kettle (1) kettle cover (104) below, 2/3 top of the cauldron body (105).
10. The system for removing N-nitroso compounds from a crude product of pendimethalin as claimed in claim 9, wherein: the overflow pipeline (15) is provided with a ball valve (16) and a sight glass B (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921397893.2U CN210620665U (en) | 2019-08-27 | 2019-08-27 | System for removing N-nitroso compound from pendimethalin crude product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921397893.2U CN210620665U (en) | 2019-08-27 | 2019-08-27 | System for removing N-nitroso compound from pendimethalin crude product |
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| Publication Number | Publication Date |
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| CN210620665U true CN210620665U (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921397893.2U Active CN210620665U (en) | 2019-08-27 | 2019-08-27 | System for removing N-nitroso compound from pendimethalin crude product |
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| CN (1) | CN210620665U (en) |
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