Novel 2-hydroxy-benzonitrile sodium salt production device

Abstract

The utility model discloses a novel 2-hydroxy-benzonitril sodium salt production device which comprises a 2-hydroxy-benzonitril filter and further comprises a salt forming kettle, materials of the 2-hydroxy-benzonitril filter enter the salt forming kettle, a heating jacket is arranged outside the salt forming kettle, a stirring structure is arranged in the salt forming kettle, a sodium hydroxide solution adding pipeline is arranged on the salt forming kettle, and the sodium hydroxide solution adding pipeline is communicated with the heating jacket. The sodium hydroxide solution adding pipeline is connected with a sodium hydroxide storage tank, the salifying kettle is provided with a material discharging pipeline, the material discharging pipeline is connected with a preparation tank, the bottom of the preparation tank is provided with a discharging pipeline, and the discharging pipeline is provided with a valve. After filtration, a finished product of 2-hydroxy-benzonitrile directly enters a salt forming kettle, a sodium hydroxide solution is added into the salt forming kettle, exposure of 2-hydroxy-benzonitrile in front of production personnel is reduced, the sodium hydroxide solution of 2-hydroxy-benzonitrile sodium is directly prepared in the step, feeding is facilitated for downstream customers, and physical and psychological health of personnel can be greatly protected. And material drying is not needed, and energy consumption of drying is reduced.

Description

Technical Field

[0001] The utility model relates to a new type of sodium salicylonitrile production device, belonging to the field of chemical production. Background Art

[0002] Salicylonitrile, also known as o-hydroxybenzonitrile, is a chemical substance with the chemical formula C7H5NO. It is one of the important intermediates for synthesizing the fungicide azoxystrobin. Its synthesis mainly has the following two methods:

[0003] 1. Salicylaldehyde reacts with hydroxylamine hydrochloride to form salicylaldoxime, and then salicylonitrile is obtained by dehydration with acetic anhydride or thionyl chloride.

[0004] 2. Salicylamide is dehydrated in the presence of phosgene, thionyl chloride or phosphorus trioxide to prepare salicylonitrile.

[0005] Salicylonitrile has a very pungent odor. Even a small amount can affect people's breathing, and the odor is bitter. The produced salicylonitrile finished product will not only cause great physical harm to production personnel. There are also great problems during transportation. When downstream manufacturers continue to produce using salicylonitrile, there is also an odor problem during feeding, which causes great harm to the body. Therefore, we hope to directly make salicylonitrile into an aqueous solution of sodium salicylonitrile. On the one hand, it is convenient for downstream manufacturers to feed materials (when using salicylonitrile to produce downstream products, usually an aqueous sodium hydroxide solution needs to be added), and the materials can be directly sucked. On the other hand, it reduces the exposure of personnel to salicylonitrile and reduces personnel injuries. Summary of the Utility Model

[0006] Aiming at the above technical problems, the purpose of the utility model is to provide another new type of sodium salicylonitrile production device. It directly produces a solution of sodium salicylonitrile, avoids the exposure of salicylonitrile, reduces personnel injuries, and facilitates the direct feeding of downstream products.

[0007] In order to achieve the above purpose, the technical solution of the utility model is: a new type of sodium salicylonitrile production device, including a salicylonitrile filter, characterized in that: it further includes a salification kettle. The materials of the salicylonitrile filter enter the salification kettle. A heating jacket is arranged outside the salification kettle, a stirring structure is arranged inside the salification kettle, a sodium hydroxide solution adding pipeline is arranged on the salification kettle, the sodium hydroxide solution adding pipeline is connected to a sodium hydroxide storage tank, a material discharging pipeline is arranged on the salification kettle, the material discharging pipeline is connected to a modulation tank, a discharging pipeline is arranged at the bottom of the modulation tank, and a valve is arranged on the discharging pipeline.

[0008] In the above solution: a metering pump is arranged on the sodium hydroxide solution adding pipeline. It realizes quantitative and automatic addition.

[0009] In the above solution: the filter is a centrifuge. It can remove the solvent toluene as much as possible.

[0010] In the above solution: a nitrogen gas pressure feeding pipeline is provided on the salt-forming kettle, and the material discharging pipeline is located at the upper part of the salt-forming kettle. The material is pressed out by nitrogen gas.

[0011] In the above solution: the material discharging pipeline is located at the bottom of the salt-forming kettle. Discharging is carried out through the bottom.

[0012] Beneficial effects: After filtration in the present utility model, the finished product of salicylonitrile directly enters the salt-forming kettle, and sodium hydroxide solution is added into the salt-forming kettle, reducing the exposure of salicylonitrile in front of production personnel. The sodium hydroxide solution of sodium salicylate is directly prepared in this step, without odor, facilitating the feeding of downstream customers, and can greatly protect the physical and mental health of personnel. Moreover, there is no need for material drying, reducing the energy consumption of drying. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the present utility model. Detailed Embodiments

[0014] The present utility model will be further described below through embodiments in conjunction with the drawings:

[0015] Embodiment 1, as Figure 1 shown, a novel production device for sodium salicylonitrile salt includes a dehydration kettle 1. A stirring device is arranged in the dehydration kettle 1. A salicylamide adding port and a toluene adding pipeline are arranged at its top end. The toluene adding pipeline is connected to a toluene storage tank 7. A pump 8, a flowmeter 9 and an automatic control valve 10 are arranged on the toluene adding pipeline. Toluene is pumped into the dehydration kettle 1 by the pump, reducing personnel contact. A steam outlet is arranged at the upper end of the dehydration kettle 1 and is connected to a condenser 11. Toluene and salicylamide are refluxed and dehydrated in the dehydration kettle, and water becomes steam and is condensed and separated out through the condenser 11.

[0016] The bottom discharge port of the dehydration kettle 1 is connected to the material inlet of the photochemical reaction kettle 2 through a pipeline. A valve is arranged on this pipeline. A phosgene adding pipeline and a tail gas pipeline are arranged at the top end of the photochemical reaction kettle 2. The phosgene adding pipeline extends to the inner bottom of the photochemical reaction kettle 2. The phosgene adding pipeline is connected to a phosgene buffer tank 18. A flowmeter and an automatic control valve are arranged on the phosgene adding pipeline. The tail gas pipeline is connected to a tail gas buffer tank 12. A tail gas recovery pipeline is arranged on the tail gas buffer tank 12 and is connected to the inside of the photochemical reaction kettle 2. A tail gas pipeline is also arranged on the tail gas buffer tank 12 and is connected to a tail gas destruction system. The tail gas destruction system includes a hydrogen chloride absorption device 13, a water destruction tower 14 and an alkali destruction tower 15 connected in sequence. The alkali destruction tower 15 is connected to an exhaust system. A spray ammonia nozzle is arranged in the exhaust system to spray ammonia on the passing tail gas for treatment. Automatic control valves are arranged on both the tail gas recovery pipeline and the tail gas pipeline.

[0017] The bottom discharge port of the photochemical reactor 2 is connected to the feed port of the washing reactor 3 through a feed pipe, and a pH meter and a temperature sensor are arranged in the washing reactor 3. The top of the washing reactor 3 is provided with a first washing liquid adding pipeline and a second washing liquid adding pipeline, which are respectively connected to the first washing liquid storage tank 16 and the second washing liquid storage tank 17, and the first washing liquid adding pipeline and the second washing liquid adding pipeline are respectively provided with a pump, a flow meter and an automatic control valve, the bottom drain pipe of the washing reactor 3 is connected to the wastewater storage tank 20, the bottom organic phase pipeline of the washing reactor 3 is connected to the liquid inlet of the crystallization reactor 4, and the tops of the dehydration reactor 1, the photochemical reactor 2, the washing reactor 3, and the crystallization reactor 4 are provided with a nitrogen gas pipeline for pressing.

[0018] Crystallization kettle 4 is provided with a stirring device, and the material outlet of crystallization kettle 4 is connected with salicylonitrile filter 5, and preferably salicylonitrile filter 5 is a centrifuge. The bottom wastewater outlet of salicylonitrile filter 5 is connected with toluene storage tank 19 for recovery, and the crude product obtained by filtering salicylonitrile filter 5 enters salting kettle 6, and a heating jacket (this is a conventional design, and jacket is not drawn in the figure) is provided outside salting kettle 6, and a stirring structure (this is a conventional design, and stirring structure is not drawn in the figure) is provided in salting kettle 6, and a sodium hydroxide solution adding pipeline is provided on salting kettle, and the sodium hydroxide solution adding pipeline is connected with sodium hydroxide storage tank 21, and a metering pump 23 is provided on the sodium hydroxide solution adding pipeline. A material discharging pipeline is provided on salting kettle 6, and the material discharging pipeline is connected with modulation tank 22, and a discharging pipeline is provided at the bottom of modulation tank 22, and a valve is provided on the discharging pipeline. A nitrogen pressure feed pipeline can be provided on salting kettle 6, and the material discharging pipeline is located at the upper part of salting kettle. Discharging by nitrogen pressure. Alternatively, the material discharge pipeline may be located at the bottom of the salt forming kettle.

[0019] The present invention is not limited to the above-mentioned embodiments. The above-mentioned equipment for preparing salicylic nitrile may be other equipment as long as it can produce salicylic nitrile. Those skilled in the art can understand that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principle and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A new type of sodium salicylonitrile production device, including a salicylonitrile filter, characterized in that: It further includes a salifying kettle. The material from the salicylo-nitrile filter enters the salifying kettle. A heating jacket is arranged outside the salifying kettle, and a stirring structure is arranged inside the salifying kettle. A sodium hydroxide solution adding pipeline is arranged on the salifying kettle, and the sodium hydroxide solution adding pipeline is connected to a sodium hydroxide storage tank. A material discharging pipeline is arranged on the salifying kettle, and the material discharging pipeline is connected to a modulation tank. A discharging pipeline is arranged at the bottom of the modulation tank, and a valve is arranged on the discharging pipeline.

2. The novel sodium salicylonitrile production device according to claim 1, wherein: A metering pump is arranged on the sodium hydroxide solution adding pipeline.

3. The novel sodium salicylonitrile production device according to claim 1, characterized in that: The filter is a centrifuge.

4. The novel sodium salicylonitrile production device according to claim 1 or 2 or 3, characterized in that: A nitrogen pressure feeding pipeline is arranged on the salifying kettle, and the material discharging pipeline is located at the upper part of the salifying kettle.

5. The novel sodium salicylonitrile production device according to claim 1 or 2 or 3, characterized in that: The material discharging pipeline is located at the bottom of the salifying kettle.

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