A dimethylacetamide solvent recovery tower recrystallization device

Abstract

The utility model discloses a dimethylacetamide solvent recovery tower recrystallization device, comprising a first recrystallization kettle, a first centrifuge, a first recrystallization condenser, a first dryer and a first centrifugal mother liquor tank, wherein the first outlet end of the first recrystallization kettle is connected to the first inlet end of the first centrifuge, the first outlet end of the first centrifuge is connected to the first inlet end of the first centrifuge mother liquor tank, the second outlet end of the first centrifuge is connected to the first inlet end of the first dryer, and the second outlet end of the first recrystallization kettle is connected to the first inlet end of the first recrystallization condenser. The dimethylacetamide solvent recovery tower recrystallization device provided by the utility model has a simple structure, is stable and reliable, can quickly extract, collect and process dimethylacetamide in the kettle liquid, and can avoid its discharge from polluting water resources, destroying ecology and endangering human health.

Description

Technical Field

[0001] The utility model belongs to the technical field of recrystallization recovery, and specifically relates to a dimethylacetamide solvent recovery tower recrystallization device. Background Art

[0002] Dimethylacetamide (DMAc) is a colorless, transparent liquid that is flammable and can be mixed with organic solvents such as water, alcohol, ether, ester, benzene, chloroform and aromatic compounds. Dimethylacetamide is a highly polar non-protonated solvent and is widely used in industries such as textiles, cosmetics, and membrane material preparation. According to statistics, the annual consumption of dimethylacetamide in my country reaches tens of thousands of tons, but there is still no suitable treatment method for production wastewater containing dimethylacetamide. If a conventional biological treatment process is used, due to the toxic effect of dimethylacetamide, it will inhibit microbial activity in the treatment process, causing the disintegration and loss of activated sludge, which seriously affects the treatment effect. After the wastewater that does not meet the standards enters the water environment, it will damage the ecology and endanger human health. Therefore, in the production process involving dimethylacetamide solvent, it is necessary to recrystallize the kettle liquid and collect and treat dimethylacetamide, so as to ensure that it can avoid damaging the ecology and endangering human health. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the utility model provides a dimethylacetamide solvent recovery tower recrystallization device.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A dimethylacetamide solvent recovery tower recrystallization device comprises a first recrystallization kettle, a first centrifuge, a first recrystallization condenser, a first dryer and a first centrifugal mother liquor tank, wherein the first outlet end of the first recrystallization kettle is connected to the first inlet end of the first centrifuge, the first outlet end of the first centrifuge is connected to the first inlet end of the first centrifugal mother liquor tank, the second outlet end of the first centrifuge is connected to the first inlet end of the first dryer, the second outlet end of the first recrystallization kettle is connected to the first inlet end of the first recrystallization condenser, the circulating water inlet of the first recrystallization kettle and the first recrystallization condenser is connected to the workshop circulating water supply main pipe, and the circulating water outlet of the first recrystallization kettle and the first recrystallization condenser is connected to the workshop circulating water return main pipe.

[0006] Furthermore, the dimethylacetamide solvent recovery tower recrystallization device includes a second recrystallization kettle, a first outlet end of the second recrystallization kettle is connected to the first inlet end of the first centrifuge, a second outlet end of the second recrystallization kettle is connected to the first inlet end of the first recrystallization condenser, a circulating water inlet of the second recrystallization kettle is connected to the workshop circulating water supply main pipe, and a circulating water outlet of the second recrystallization kettle is connected to the workshop circulating water return main pipe.

[0007] Furthermore, the dimethylacetamide solvent recovery tower recrystallization device includes a first vacuum condenser and a second centrifugal mother liquor tank, the circulating water inlet of the first vacuum condenser is connected to the workshop circulating water supply main, the circulating water outlet of the first vacuum condenser is connected to the workshop circulating water return main, the first outlet end of the first dryer is connected to the first inlet end of the first vacuum condenser, the first outlet end of the first vacuum condenser is connected to the first inlet end of the second centrifugal mother liquor tank, and the first outlet end of the second centrifugal mother liquor tank is connected to the first inlet end of the first centrifugal mother liquor tank.

[0008] Furthermore, the dimethylacetamide solvent recovery tower recrystallization device includes a first centrifugal mother liquor delivery pump and a second centrifugal mother liquor delivery pump, and the first inlet ends of the first centrifugal mother liquor delivery pump and the second centrifugal mother liquor delivery pump are connected to the first outlet end of the first centrifugal mother liquor tank.

[0009] Furthermore, a first sampling tube is provided at the first outlet end of the first centrifugal mother liquor delivery pump, and a first sampling valve is provided on the first sampling tube; a second sampling tube is provided at the first outlet end of the second centrifugal mother liquor delivery pump, and a second sampling valve is provided on the second sampling tube.

[0010] The utility model discloses a dimethylacetamide solvent recovery tower recrystallization device. Compared with the prior art, the utility model has the beneficial effects of simple structure, stability and reliability, and can quickly extract, collect and process dimethylacetamide in kettle liquid, thereby preventing the dimethylacetamide from being discharged to pollute water resources, damage ecology and endanger human health. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a preferred embodiment provided by the utility model.

[0012] Figure 2 It is a structural schematic diagram of the second centrifugal mother liquid tank of the preferred embodiment provided by the utility model.

[0013] Figure 3 It is a structural schematic diagram of the first centrifugal mother liquid tank of the preferred embodiment provided by the utility model.

[0014] The accompanying drawings include: 1. first recrystallization kettle; 2. second recrystallization kettle; 3. first recrystallization condenser; 4. first centrifuge; 5. first dryer; 6. first centrifugal mother liquor tank; 7. first vacuum condenser; 8. second centrifugal mother liquor tank; 9. first centrifugal mother liquor delivery pump; 10. second centrifugal mother liquor delivery pump; 11. first sampling valve; 12. second sampling valve. DETAILED DESCRIPTION

[0015] The utility model discloses a dimethylacetamide solvent recovery tower recrystallization device. The specific implementation manner of the utility model is further described below in conjunction with a preferred embodiment.

[0016] See attached figure Figure 1-3 , Figure 1 It is a structural schematic diagram of a preferred embodiment provided by the utility model. Figure 2 It is a structural schematic diagram of the second centrifugal mother liquid tank 8 of the preferred embodiment provided by the utility model, Figure 3 It is a structural schematic diagram of the first centrifugal mother liquid tank 6 of the preferred embodiment provided by the utility model.

[0017] Preferred embodiments.

[0018] The present embodiment provides a dimethylacetamide solvent recovery tower recrystallization device, comprising a first recrystallization kettle 1, a first centrifuge 4, a first recrystallization condenser 3, a first dryer 5 and a first centrifugal mother liquor tank 6, wherein the first outlet end of the first recrystallization kettle 1 is connected to the first inlet end of the first centrifuge 4, the first outlet end of the first centrifuge 4 is connected to the first inlet end of the first centrifugal mother liquor tank 6, the second outlet end of the first centrifuge 4 is connected to the first inlet end of the first dryer 5, the second outlet end of the first recrystallization kettle 1 is connected to the first inlet end of the first recrystallization condenser 3, the circulating water inlets of the first recrystallization kettle 1 and the first recrystallization condenser 3 are connected to the workshop circulating water supply main, and the circulating water outlets of the first recrystallization kettle 1 and the first recrystallization condenser 3 are connected to the workshop circulating water return main.

[0019] Furthermore, the dimethylacetamide solvent recovery tower recrystallization device includes a second recrystallization kettle 2, a first outlet end of the second recrystallization kettle 2 is connected to the first inlet end of the first centrifuge 4, a second outlet end of the second recrystallization kettle 2 is connected to the first inlet end of the first recrystallization condenser 3, a circulating water inlet of the second recrystallization kettle 2 is connected to the workshop circulating water supply main, and a circulating water outlet of the second recrystallization kettle 2 is connected to the workshop circulating water return main.

[0020] Furthermore, the dimethylacetamide solvent recovery tower recrystallization device includes a first vacuum condenser 7 and a second centrifugal mother liquor tank 8, the circulating water inlet of the first vacuum condenser 7 is connected to the workshop circulating water supply main, the circulating water outlet of the first vacuum condenser 7 is connected to the workshop circulating water return main, the first outlet end of the first dryer 5 is connected to the first inlet end of the first vacuum condenser 7, the first outlet end of the first vacuum condenser 7 is connected to the first inlet end of the second centrifugal mother liquor tank 8, and the first outlet end of the second centrifugal mother liquor tank 8 is connected to the first inlet end of the first centrifugal mother liquor tank 6.

[0021] Furthermore, the dimethylacetamide solvent recovery tower recrystallization device includes a first centrifugal mother liquor delivery pump 9 and a second centrifugal mother liquor delivery pump 10, and the first inlet ends of the first centrifugal mother liquor delivery pump 9 and the second centrifugal mother liquor delivery pump 10 are connected to the first outlet end of the first centrifugal mother liquor tank 6.

[0022] Furthermore, a first sampling tube is provided at the first outlet end of the first centrifugal mother liquor delivery pump 9 , and a first sampling valve 11 is provided on the first sampling tube; a second sampling tube is provided at the first outlet end of the second centrifugal mother liquor delivery pump 10 , and a second sampling valve 12 is provided on the second sampling tube.

[0023] Working principle: The workshop circulating water supply main pipe and the workshop circulating water return main pipe maintain the temperature of the first recrystallization kettle 1 and the second recrystallization kettle 2 to ensure the crystallization effect of the upper kettle liquid in the first recrystallization kettle 1 and the second recrystallization kettle 2. After crystallization, the materials in the first recrystallization kettle 1 and the second recrystallization kettle 2 are sent to the first centrifuge 4. After the centrifugal treatment of the first centrifuge 4, the solid material is sent to the first dryer 5, and the liquid material (that is, the dimethylacetamide solution) is sent to the first centrifugal mother liquid tank 6. Nitrogen and steam are introduced into the first dryer 5 to bring the residual dimethylacetamide into the first vacuum condenser 7. After the condensation treatment of the first vacuum condenser 7, it is collected in the second centrifugal mother liquid tank 8. The dimethylacetamide solvent in the second centrifugal mother liquid tank 8 is introduced into the first centrifugal mother liquid tank 6 for collection. It is pumped into the next level process through the first centrifugal mother liquid delivery pump 9 or the second centrifugal mother liquid delivery pump 10. In addition, the gaseous substances in the first recrystallization kettle 1 and the second recrystallization kettle 2 enter the first recrystallization condenser 3 through the second outlet port, and are collected in a processing tank after being cooled by the first recrystallization condenser 3.

[0024] It is worth mentioning that the technical features such as the first dryer 5 involved in the utility model patent application should be regarded as the prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional methods in the field, and should not be regarded as the utility model point of the utility model patent. This utility model patent will not be further elaborated.

[0025] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A dimethylacetamide solvent recovery tower recrystallization device, characterized in that: The invention comprises a first recrystallization kettle (1), a first centrifuge (4), a first recrystallization condenser (3), a first dryer (5) and a first centrifugal mother liquor tank (6), wherein the first outlet end of the first recrystallization kettle (1) is connected to the first inlet end of the first centrifuge (4), the first outlet end of the first centrifuge (4) is connected to the first inlet end of the first centrifugal mother liquor tank (6), the second outlet end of the first centrifuge (4) is connected to the first inlet end of the first dryer (5), the second outlet end of the first recrystallization kettle (1) is connected to the first inlet end of the first recrystallization condenser (3), the circulating water inlets of the first recrystallization kettle (1) and the first recrystallization condenser (3) are connected to the workshop circulating water supply main pipe, and the circulating water outlets of the first recrystallization kettle (1) and the first recrystallization condenser (3) are connected to the workshop circulating water return main pipe.

2. The dimethylacetamide solvent recovery tower recrystallization device according to claim 1, characterized in that: The dimethylacetamide solvent recovery tower recrystallization device comprises a second recrystallization kettle (2), a first outlet end of the second recrystallization kettle (2) is connected to a first inlet end of the first centrifuge (4), a second outlet end of the second recrystallization kettle (2) is connected to a first inlet end of the first recrystallization condenser (3), a circulating water inlet of the second recrystallization kettle (2) is connected to a circulating water supply main pipe of the workshop, and a circulating water outlet of the second recrystallization kettle (2) is connected to a circulating water return main pipe of the workshop.

3. The dimethylacetamide solvent recovery tower recrystallization device according to claim 2, characterized in that: The dimethylacetamide solvent recovery tower recrystallization device comprises a first vacuum condenser (7) and a second centrifugal mother liquor tank (8), wherein the circulating water inlet of the first vacuum condenser (7) is connected to the workshop circulating water supply main pipe, the circulating water outlet of the first vacuum condenser (7) is connected to the workshop circulating water return main pipe, the first outlet end of the first dryer (5) is connected to the first inlet end of the first vacuum condenser (7), the first outlet end of the first vacuum condenser (7) is connected to the first inlet end of the second centrifugal mother liquor tank (8), and the first outlet end of the second centrifugal mother liquor tank (8) is connected to the first inlet end of the first centrifugal mother liquor tank (6).

4. The dimethylacetamide solvent recovery tower recrystallization device according to claim 3, characterized in that: The dimethylacetamide solvent recovery tower recrystallization device comprises a first centrifugal mother liquor delivery pump (9) and a second centrifugal mother liquor delivery pump (10), wherein the first inlet ends of the first centrifugal mother liquor delivery pump (9) and the second centrifugal mother liquor delivery pump (10) are connected to the first outlet end of the first centrifugal mother liquor tank (6).

5. The dimethylacetamide solvent recovery tower recrystallization device according to claim 4, characterized in that: A first sampling tube is provided at the first outlet end of the first centrifugal mother liquor delivery pump (9), and a first sampling valve (11) is provided on the first sampling tube. A second sampling tube is provided at the first outlet end of the second centrifugal mother liquor delivery pump (10), and a second sampling valve (12) is provided on the second sampling tube.

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