Distillation device in imazethapyr production

Abstract

The utility model belongs to the technical field of chemical production, and discloses a distillation device in imazethapyr production, which comprises a distillation kettle provided with a temperature exchange jacket, the top of the distillation kettle is respectively communicated with an air lift pipeline, a feeding pipeline and a circulating pipeline, a condenser is arranged on the air lift pipeline, and the condenser is communicated to a solvent receiving tank through a liquid outlet pipe; a circulating pump and a falling film evaporator are arranged on the circulating pipeline; a discharge hole is formed in the bottom of the distillation kettle, and is communicated with a hazardous waste barrel through a discharge pipeline; a solvent outlet is formed in the bottom of the solvent receiving tank and is respectively communicated with a ramming pipeline and a flushing pipeline through a solvent ramming pump, and the flushing pipeline is communicated to the top of the discharge hole of the distillation kettle. According to the utility model, the blockage of the kettle bottom valve and the discharging pipeline and the increase of hazardous waste caused by flushing can be avoided, so that the labor intensity is reduced, the production efficiency is improved, and the production peculiar smell is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and in particular relates to a distillation device in the production of imazethapyr. Background Art

[0002] Imazethapyr is a lethal herbicide that can be quickly absorbed by the roots and leaves of weeds, and inhibits the growth of weeds by inhibiting the biosynthesis of branched-chain amino acids. In the production process of imazethapyr original medicine, it is necessary to separate materials by distillation. When the separation mother liquor contains methanol water, because most of the raw materials in the mother liquor are chemical synthesis products, tar and other polymer impurities will be produced during the distillation process. These tar impurities are generally in a high-temperature liquid and low-temperature solidified state. After the distillation is completed, these impurities will be discharged into the residue barrel and will be rapidly cooled and solidified. In the prior art, when the distillation kettle is discharged, the residual materials in the discharge pipeline and the bottom valve of the kettle will solidify, resulting in blockage of valves and pipelines: 1. It is necessary to manually disassemble and dredge or dissolve and dredge with high-temperature and high-pressure steam, which wastes manpower and material resources and production cycles, and also produces odor; 2. Add water or organic solvent to the distillation kettle for dissolution and flushing for dredging, but the dredging solvent will enter the hazardous waste barrel with the hazardous waste, increasing the amount of hazardous waste, and greatly increasing the cost of hazardous waste disposal in the long run. In short, the above two treatment methods have defects, so it is necessary to find other solutions. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a distillation kettle flushing device in the production of imazamo, which overcomes the defects in the prior art and can avoid the blockage of the valve at the bottom of the kettle and the discharge pipeline, as well as the increase in the amount of hazardous waste caused by flushing, thereby reducing labor intensity, improving production efficiency and reducing production odor.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A distillation device for the production of imazamox comprises a distillation kettle provided with a temperature exchange jacket, wherein the top of the distillation kettle is respectively connected with an air lift pipeline, a feed pipeline and a circulation pipeline; a condenser is provided on the air lift pipeline, and the condenser is connected to a solvent receiving tank through a liquid outlet pipe; a circulation pump and a falling film evaporator are provided on the circulation pipeline; a discharge port is provided at the bottom of the distillation kettle, and the discharge port is connected to a hazardous waste barrel through a discharge pipeline; a solvent outlet is provided at the bottom of the solvent receiving tank, and the solvent outlet is respectively connected with a feeding pipeline and a flushing pipeline through a solvent feeding pump, and the flushing pipeline is connected to the top of the discharge port of the distillation kettle.

[0006] Preferably, the distillation kettle is an enamel distillation kettle; a liquid level gauge is provided in the distillation kettle.

[0007] Preferably, the other end of the feed pipeline is connected to a mother liquid tank, in which a liquid level gauge is provided; and a cut-off valve is provided on the feed pipeline to supply the mother liquid obtained in the previous process to the distillation kettle.

[0008] Preferably, one end of the circulation pipeline is connected to the bottom of the distillation kettle, and the other end is connected to the top of the distillation kettle; the circulation pump is arranged at the bottom of the circulation pipeline, and the falling film evaporator is arranged at the upper part of the circulation pipeline.

[0009] Preferably, two condensers are arranged in series, namely the first condenser and the second condenser, and the second condenser is connected to the solvent receiving tank through a liquid outlet pipe; a remote thermometer is provided on the liquid outlet pipe connected to the second condenser, and the remote thermometer forms an interlocking control with the condensation remote regulating valve (for adjusting and controlling the condenser outlet temperature) arranged on the low-temperature water return pipe at the upper end of the second condenser.

[0010] Furthermore, the second condenser and the solvent receiving tank are both provided with tail gas outlets, and the tail gas outlets are connected to the tail gas treatment device through a pipeline.

[0011] Preferably, the discharge port of the distillation kettle is provided with a shut-off valve and an electronic scale, and the shut-off valve and the electronic scale are interlocked and controlled.

[0012] Preferably, the solvent receiving tank is connected to a solvent storage tank through a feeding pipeline, and the collected solvent is temporarily stored for future use.

[0013] Preferably, a draft system is provided at the discharge port of the discharge pipeline, and the draft system is connected to the tail gas treatment device to absorb and treat the odor generated during the discharge.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0015] The utility model utilizes a distillation kettle to distill and separate methanol-containing water / tar impurities in imazamox mother liquor material, accelerates distillation through cyclic evaporation in a falling film evaporator, and improves distillation effect; the separated methanol-containing water (solvent) is first collected in a solvent receiving tank through condensation in a condenser, and then the solvent is returned to the discharge port of the distillation kettle to flush the discharge port area and the discharge pipeline after the discharge of the distillation kettle is completed; through the above arrangement, the purpose of improving distillation efficiency and preventing the discharge pipeline and the kettle bottom valve from being blocked is achieved.

[0016] In short, the utility model can avoid the blockage of the kettle bottom valve and the discharge pipeline, as well as the increase of hazardous waste caused by flushing, thereby reducing labor intensity, improving production efficiency, and reducing production odor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0018] In the figure, 1. distillation kettle; 2. gas lift pipeline; 3. feed pipeline; 4. circulation pipeline; 5. condenser; 6. solvent receiving tank; 7. circulation pump; 8. falling film evaporator; 9. discharge pipeline; 10. hazardous waste barrel; 11. solvent feed pump; 12. feed pipeline; 13. flushing pipeline. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Embodiment 1:

[0021] like Figure 1 As shown, a distillation device for the production of imazamox comprises a still 1 provided with a temperature exchange jacket (not marked), the top of the still 1 is respectively connected with an air lift pipeline 2, a feed pipeline 3 and a circulation pipeline 4, the air lift pipeline 2 is provided with a condenser 5, and the condenser 5 is connected to a solvent receiving tank 6 through a liquid outlet pipe (not marked); the circulation pipeline 4 is provided with a circulation pump 7 and a falling film evaporator 8; the bottom of the still 1 is provided with a discharge port (not marked), and the discharge port is connected to a hazardous waste barrel 10 through a discharge pipeline 9; the bottom of the solvent receiving tank 6 is provided with a solvent outlet (not marked), and the solvent outlet is respectively connected to a feed pipeline 12 and a flushing pipeline 13 through a solvent feed pump 11, and the flushing pipeline 13 is connected to the top of the discharge port of the still 1.

[0022] In actual production: first, the mother liquor is transported to the still 1. When feeding, the shut-off valve (not shown) arranged on the feed pipeline is interlocked with the liquid level gauge (high liquid level) in the still 1 and the liquid level gauge (low liquid level) in the mother liquid tank to control the feed amount within an appropriate range; then, the heating device of the still 1 is turned on to increase the temperature, and at the same time, the falling film evaporator 8 is turned on to start the circulation distillation, and the fraction rate and the temperature in the still are observed to adjust the steam size;

[0023] When the temperature reaches 130°C in the later stage of distillation, the fraction is very small, so stop heating and observe whether the residue in the kettle is in a colloid or paste state. Preheat the discharge pipeline 9 in advance, and after the hazardous waste barrel 10 is placed, open the odor induced air system and start to discharge the waste residue; when the set value of 300kg is reached, the interlock automatically closes the kettle bottom shut-off valve, replace the hazardous waste barrel 10, and repeat the above operation;

[0024] After the slag is discharged, the feeding valve of the feeding pipeline 12 is closed, and the flushing valve and the solvent feeding pump 11 on the flushing pipeline 13 are opened. The alcohol-containing water in the solvent receiving tank 6 is used for washing. The alcohol-containing water enters the distillation kettle 1 from the bottom of the kettle. After flushing is completed, the shut-off valve at the bottom of the kettle is closed first, and then the solvent feeding pump 11 is closed to end the flushing.

[0025] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A distillation device for the production of imazethapyr, characterized in that: It comprises a distillation kettle provided with a temperature exchange jacket, the top of which is respectively connected with an air lift pipeline, a feed pipeline and a circulation pipeline; the air lift pipeline is provided with a condenser, which is connected to a solvent receiving tank through a liquid outlet pipe; the circulation pipeline is provided with a circulation pump and a falling film evaporator; the bottom of the distillation kettle is provided with a discharge port, which is connected to a hazardous waste barrel through a discharge pipeline; the bottom of the solvent receiving tank is provided with a solvent outlet, which is respectively connected with a feeding pipeline and a flushing pipeline through a solvent feeding pump, and the flushing pipeline is connected to the top of the discharge port of the distillation kettle.

2. The distillation device for the production of imazethapyr as claimed in claim 1, characterized in that: The distillation kettle is an enamel distillation kettle; a liquid level gauge is arranged inside the distillation kettle.

3. The distillation device for the production of imazethapyr as claimed in claim 1, characterized in that: The other end of the feed pipeline is connected to the mother liquid tank, in which a liquid level gauge is arranged; and a cut-off valve is arranged on the feed pipeline.

4. The distillation device for the production of imazethapyr as claimed in claim 1, characterized in that: One end of the circulation pipeline is connected to the bottom of the distillation kettle, and the other end is connected to the top of the distillation kettle; the circulation pump is arranged at the bottom of the circulation pipeline, and the falling film evaporator is arranged at the upper part of the circulation pipeline.

5. The distillation device for the production of imazethapyr as claimed in claim 1, characterized in that: There are two condensers connected in series, namely the first condenser and the second condenser. The second condenser is connected to the solvent receiving tank through a liquid outlet pipe. A remote thermometer is provided on the liquid outlet pipe connected to the second condenser. The remote thermometer forms an interlocking control with the condensation remote regulating valve on the low-temperature water return pipe arranged at the upper end of the second condenser.

6. The distillation device for the production of imazethapyr as claimed in claim 1, characterized in that: The discharge port of the distillation kettle is provided with a cut-off valve and an electronic scale, and the cut-off valve and the electronic scale are interlocked and controlled.

7. The distillation device for producing imazethapyr as claimed in claim 1, characterized in that: The solvent receiving tank is connected to the solvent storage tank through a feeding pipeline.

8. The distillation device for the production of imazethapyr as claimed in claim 1, characterized in that: An air induced draft system is provided at the discharge port of the discharge pipeline, and the air induced draft system is connected to the tail gas treatment device.

Images