CN216498451U - Cauldron liquid recovery unit in formamide preparation process - Google Patents
Cauldron liquid recovery unit in formamide preparation process Download PDFInfo
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- CN216498451U CN216498451U CN202123130564.1U CN202123130564U CN216498451U CN 216498451 U CN216498451 U CN 216498451U CN 202123130564 U CN202123130564 U CN 202123130564U CN 216498451 U CN216498451 U CN 216498451U
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Abstract
The utility model provides a kettle liquid recovery device in a formamide preparation process, which comprises a kettle liquid recovery reactor, wherein a kettle liquid inlet is arranged at the upper part of the kettle liquid recovery reactor, a Venturi jet pump is arranged in the kettle liquid recovery reactor below the kettle liquid inlet, a gas ammonia distributor is arranged in the kettle liquid recovery reactor below a jet orifice of the Venturi jet pump, the gas ammonia distributor is connected with a gas ammonia pipeline, the gas ammonia pipeline extends to the outside of the kettle liquid recovery reactor and is provided with a pipeline interface, the Venturi jet pump comprises an inlet section connected with the kettle liquid inlet, the bottom of the inlet section is provided with a contraction section, the bottom of the contraction section is a diffusion section, the outlet of the diffusion section is a kettle liquid jet orifice, and an ammonia suction inlet is arranged between the inlet section and the contraction section. The utility model can help to obtain qualified formamide products, reduce hazardous waste discharge and obtain greater economic benefit.
Description
Technical Field
The utility model relates to a kettle liquid recovery device in a formamide preparation process, and belongs to the technical field of chemical machinery.
Background
Formamide is a compound, is colorless transparent liquid, has slight ammonia smell, is a raw material for synthesizing medicines, spices, dyes and the like, can also be used as a solvent for spinning of synthetic fibers, plastic processing, production of lignocelluloses ink and the like, and is produced into a product with the purity of more than 99.5 percent by taking ammonia and methyl formate as raw materials through the processes of synthesis, rough distillation, dehydration, rectification and the like.
The detailed reaction formula is as follows: NH (NH)3 + CH3 COOH = HCONH2+CH3OH+Q。
The formamide prepared by the reaction is a crude formamide which needs to be refined in the actual production process, so that a product with higher purity can be obtained. The refining process needs a certain temperature, the formamide can generate polymerization reaction at about 100 ℃, the polymerization is more serious at higher temperature, and decomposition and carbonization can occur at more than 130 ℃;
the reaction formula of the polymerization reaction is as follows: HCONH2+HCONH2 =HCONH2·HCONH2(i.e., DiFA).
The polymer produced during the refining operation has a serious influence on the product quality and yield, and only the frequency of discharging the kettle liquid can be increased to ensure the product purity. Therefore, a reactor for treating formamide kettle liquid can be found in the production process, so that a qualified formamide product is obtained, hazardous waste discharge can be reduced, and great economic benefit can be obtained.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model discloses a device for recovering kettle liquid in a formamide preparation process, which aims to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
the utility model provides a formamide preparation in-process cauldron liquid recovery unit, includes cauldron liquid recovery reactor, the upper portion of cauldron liquid recovery reactor is provided with cauldron liquid entry, cauldron liquid recovery reactor the inside is located cauldron liquid entry below is provided with the venturi jet pump, cauldron liquid recovery reactor the inside is located the jet orifice below of venturi jet pump is provided with gas ammonia distributor, gas ammonia distributor connects the gas ammonia pipeline, the gas ammonia pipeline extends to cauldron liquid recovery reactor's outside is provided with the pipeline interface, the venturi jet pump include with cauldron liquid entry linkage's entry section, entry section bottom has the contraction section, the contraction section bottom is the diffuser section, the exit of diffuser section is the cauldron liquid jet orifice, be provided with the ammonia sunction inlet between entry section and the contraction section.
Furthermore, the gas ammonia distributor is in a mushroom head shape, and small holes with the diameter of 1mm are uniformly distributed on the upper part of the gas ammonia distributor.
Further, the diffusion section of the Venturi jet pump is 0.8-1.0 meter long.
Further, a kettle liquid inlet and an outlet of the kettle liquid recovery reactor are connected with a circulating pipeline, and the circulating pipeline is connected with a circulating pump.
The utility model has the beneficial effects that:
1. the method comprises the steps of pumping the kettle liquid in a liquid tank of a rectification kettle to a filter for filtration, then feeding the kettle liquid into a Venturi jet pump from the upper part of a kettle liquid recovery reactor, and uniformly jetting the kettle liquid to the lower part of the reactor for absorbing incompletely-reacted gas ammonia; and introducing a certain amount of gas ammonia into the lower part of the kettle liquid recovery reactor through a gas ammonia distributor for treatment, promoting the polymer to be decomposed into formamide, and sending the formamide to a post-procedure for rectification recovery operation after the reaction is finished. The device has the advantages of reasonable overall structure design, simple flow, low cost, convenient operation and good recovery effect, and the recovery rate of the gas ammonia in the kettle liquid is improved from the original 60 percent to 95 percent, thereby obtaining good economic effect.
2. The gas ammonia distributor is in a mushroom head shape, small holes with the aperture of 1mm are uniformly distributed on the upper part of the gas ammonia distributor, ammonia is introduced for reaction for 2-3 hours at the temperature of 40-50 ℃, and the reaction is continuously circulated for 4 hours, so that the unreacted ammonia is fully utilized, and the polymer is sampled and analyzed until the polymer is reduced to below 1500 PPm.
3. The utility model absorbs unreacted ammonia by the negative pressure generated by the venturi tube, thereby improving the utilization rate of ammonia. The 6 spray heads are used for uniformly distributing the gas ammonia, so that the distribution efficiency is high, the reaction efficiency is improved, the recovery rate of the formamide is improved, and the material loss caused by side reaction in the formamide production is reduced; the utility model has the advantages of convenient maintenance and replacement, lower cost, simple operation and easy control.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of the structure of the still recovery reactor of the present invention;
in the figure: 1. a reactor for recovering the kettle liquid; 2. a kettle liquid inlet; 3. a venturi jet pump; 4. a gas ammonia distributor; 5. a gas ammonia pipeline; 6. a pipe interface; 7. An ammonia gas suction inlet; 3-1, an inlet section; 3-2, a contraction section; 3-3, a diffusion section; 8. a circulation pipe; 9. and a circulating pump.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
As shown in figure 1, the device for recovering the kettle liquid in the preparation process of formamide comprises a kettle liquid recovery reactor 1, the upper part of the kettle liquid recovery reactor is provided with a kettle liquid inlet 2, a Venturi jet pump 3 is arranged in the kettle liquid recovery reactor below the kettle liquid inlet, a gas ammonia distributor 4 is arranged in the kettle liquid recovery reactor and below the jet orifice of the Venturi jet pump, the gas ammonia distributor is connected with a gas ammonia pipeline 5, the gas ammonia pipeline extends to the outside of the kettle liquid recovery reactor and is provided with a pipeline interface 6, the Venturi jet pump comprises an inlet section 3-1 connected with the kettle liquid inlet, the bottom of the inlet section is provided with a contraction section 3-2, the bottom of the contraction section is a diffusion section 3-3, the outlet of the diffusion section is a kettle liquid jet orifice, and an ammonia gas suction inlet 7 is arranged between the inlet section and the contraction section.
In the embodiment, the gas ammonia distributor is in a mushroom head shape, and small holes with the aperture of 1mm are uniformly distributed in the upper part of the gas ammonia distributor. Introducing ammonia for reaction for 2-3 h at 40-50 ℃, and continuously circulating for 4h to ensure that unreacted ammonia is fully utilized, and sampling and analyzing until the polymer is reduced to below 1500 PPm.
The venturi jet pump described in this example has a diffuser section of 0.8-1.0 meters in length, this height having the best combination of fluid flow rate and distribution range. In this embodiment, the venturi injection pump is made of polytetrafluoroethylene, which is resistant to acid and alkali corrosion, especially NH3，CH3 In the COOH acid-base environment, iron ions can not be generated, and the method is very favorable for improving the purity of formamide products. The best mixing conditions are achieved by the ejector pump with a liquid outlet 0.2-0.5 m below the normally controlled liquid level, a fluid flow rate of 0.8-2m/s at this height and a distribution range of 90% of the cross-section of the kettle recovery reactor. The venturi jet pump mainly functions to recover the incompletely reacted gas ammonia.
In this embodiment, the kettle liquid inlet and outlet of the kettle liquid recovery reactor are connected with a circulating pipeline 8, and the circulating pipeline is connected with a circulating pump 9.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and all equivalent changes made on the basis of the above-mentioned embodiments are within the scope of the present invention.
Claims (4)
1. The device for recycling the kettle liquid in the formamide preparation process is characterized by comprising a kettle liquid recycling reactor (1), wherein a kettle liquid inlet (2) is arranged on the upper part of the kettle liquid recycling reactor (1), a Venturi jet pump (3) is arranged below the kettle liquid inlet (2) in the kettle liquid recycling reactor (1), a gas ammonia distributor (4) is arranged below a jet orifice of the Venturi jet pump (3) in the kettle liquid recycling reactor (1), the gas ammonia distributor (4) is connected with a gas ammonia pipeline (5), the gas ammonia pipeline (5) extends to the outside of the kettle liquid recycling reactor (1) and is provided with a pipeline interface (6), the Venturi jet pump (3) comprises an inlet section (3-1) connected with the kettle liquid inlet (2), and a contraction section (3-2) is arranged at the bottom of the inlet section (3-1), the bottom of the contraction section (3-2) is provided with a diffusion section (3-3), the outlet of the diffusion section (3-3) is provided with a kettle liquid jet orifice, and an ammonia gas suction inlet (7) is arranged between the inlet section (3-1) and the contraction section (3-2).
2. The device for recovering the kettle liquid in the preparation process of the formamide as claimed in claim 1, wherein the gas ammonia distributor (4) is in a mushroom head shape, and small holes with the diameter of 1mm are uniformly distributed on the upper part of the gas ammonia distributor.
3. The kettle liquid recovery device in the formamide preparation process according to claim 1, wherein the diffusion section of the Venturi jet pump (3) is 0.8-1.0 meter long.
4. The device for recycling the kettle liquid in the formamide preparation process according to claim 1, wherein a kettle liquid inlet (2) and an outlet of the kettle liquid recycling reactor (1) are connected with a circulating pipeline (8), and a circulating pump (9) is connected on the circulating pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123130564.1U CN216498451U (en) | 2021-12-14 | 2021-12-14 | Cauldron liquid recovery unit in formamide preparation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123130564.1U CN216498451U (en) | 2021-12-14 | 2021-12-14 | Cauldron liquid recovery unit in formamide preparation process |
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| Publication Number | Publication Date |
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| CN216498451U true CN216498451U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123130564.1U Active CN216498451U (en) | 2021-12-14 | 2021-12-14 | Cauldron liquid recovery unit in formamide preparation process |
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| CN (1) | CN216498451U (en) |
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2021
- 2021-12-14 CN CN202123130564.1U patent/CN216498451U/en active Active
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