Condensing system for thifluzamide production

Abstract

The utility model relates to a condensing system for thifluzamide production, and belongs to the technical field of chemical equipment. The condensation system comprises a condenser and a water separation tank; an inlet of the condenser is connected with the reaction kettle through a distillation pipe; a bottom outlet of the condenser is connected with the water separation tank through a return pipe; a transverse partition plate I is arranged in the condenser, and a plurality of through holes are formed in the partition plate I; a refrigerant pipeline is arranged above the partition plate I; a vertical partition plate II is arranged in the water separation tank; the second partition plate divides the interior of the water separation tank into a standing area and an overflow area. The water outlet end of the return pipe is communicated with the standing area; the overflow area is provided with an overflow port; the overflow port is lower than the partition plate II; and the overflow port is connected with the reaction kettle through a liquid distribution pipe. Due to the fact that the first partition plate with the through holes is arranged in the condenser, the problem that impact flow is prone to being generated when liquefaction of the condenser is incomplete is solved. Meanwhile, two areas are arranged in the water separation tank, so that the toluene water can be completely separated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical equipment, specifically relates to a condensing system for thifluzamide production. BACKGROUND

[0002] Thifluzamide is a new benzamide systemic low-toxic broad-spectrum fungicide, which was commercialized by Rohm & Haas in 1994. Thifluzamide has strong systemic translocation, high fungicidal efficacy, long persistence, and can control cotton damping-off caused by rhizoctonia solani and fusarium oxysporum. The synthesis of thifluzamide uses 2,6-dibromo-4-trifluoromethoxy aniline and 2-methyl-4-trifluoromethyl thiazole-5-carboxylic acid as raw materials, and is prepared by reaction in toluene. Water is generated during preparation, and water can cause hydrolysis of the product structure, so timely removal of water from the product is an important means to improve product quality.

[0003] The existing thifluzamide production system uses a water separation tank to remove the generated water. The removal principle is to use the azeotrope of solvent toluene and water to liquefy in the condenser, and then to separate into two layers after liquefaction. The upper layer of toluene overflows back to the reaction kettle to continue as a solvent, and the lower layer of water remains in the water separation tank and is discharged from the lower outlet of the water separation tank after accumulating to a certain amount. In actual production, the following problems exist: first, when the reflux is severe, the steam in the condenser is not completely liquefied, which will produce gas flow, and the gas flow will impact the liquefied liquid at the outlet of the condenser, forming an impact flow, which will destroy the solution that has been separated into two layers in the water separation tank. Secondly, there is still a small amount of water in the upper layer of toluene after separation, and the condensate flowing into the water separation tank also contains a certain amount of water, which will increase the water content in the toluene after separation. UTILITY MODEL CONTENTS

[0004] In view of the problems of easy generation of impact flow when the condenser is not completely liquefied and incomplete separation of toluene and water in the water separation tank during preparation of thifluzamide, the utility model provides a condensing system for thifluzamide production, which solves the above problems.

[0005] The technical scheme of the utility model is as follows:

[0006] The utility model relates to a condensing system for thifluzamide production, including condenser and water segregating tank, the inlet of condenser is connected with the reaction kettle through distillation pipe, the bottom outlet of condenser is connected with water segregating tank through reflux pipe, the inside of condenser is equipped with the transverse baffle no.

[0007] Further, the reflux pipe extends into the standing zone, so that the fluctuation of the liquid level of the standing liquid caused by the liquid falling from above is avoided.

[0008] Further, the standing zone is provided with a liquid level gauge outside, so that the amount of water collected in the standing zone can be observed through the liquid level gauge, and the water can be discharged in time.

[0009] Further, the refrigerant pipeline is made of stainless steel.

[0010] Further, the liquid separation pipe is provided with a U-shaped tube.

[0011] Further, the standing zone and the overflow zone are each provided with a discharge valve at the bottom.

[0012] The working principle of the utility model is as follows: during the reflux reaction, the solvent toluene and the by-product water are azeotroped into the condenser, the steam in the condenser is liquefied by cooling, passes through the through holes of the baffle no. and enters the bottom of the condenser, and then flows out from the bottom outlet of the condenser into the standing zone of the water segregating tank. Due to the blockage of the baffle no., the uncondensed steam is blocked at the baffle no. and cannot form an impact flow again, so that the condensate can be stably discharged from the condenser. After the toluene and water in the standing zone of the water segregating tank are settled, they are separated into two layers, and the toluene in the upper layer still contains a small amount of water, which overflows to the overflow zone for further settlement and separation when the liquid level is higher than the baffle no. When the liquid level of the overflow zone reaches the overflow port, the water is automatically discharged outward and returns to the reaction kettle along the liquid separation pipe for further use as a solvent.

[0013] The utility model has the advantages that:

[0014] The utility model sets the baffle no. with through holes in the condenser, so that the problem of impact flow caused by incomplete liquefaction of the condenser is solved. Meanwhile, two zones are set in the water segregating tank, so that the toluene and water can be completely separated. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the present application, the drawings required to be used in the description will be briefly introduced as follows. Obviously, the drawings described in the following description are only some embodiments of the present application, and all other drawings obtained by those skilled in the art without creative labor on the basis of these drawings also belong to the protection scope of the present application.

[0016] Figure 1 It is a whole structure schematic view of the present application.

[0017] Figure 2 It is a schematic view of the internal structure of the condenser of the present application.

[0018] Figure 3 It is a schematic view of the structure of the partition plate one.

[0019] In the figure, 1 is a reaction kettle, 2 is a condenser, 3 is a water separation tank, 4 is a distillation pipe, 5 is a reflux pipe, 6 is an overflow port, 7 is a partition plate two, 8 is a liquid separation pipe, 9 is a partition plate one, 10 is a liquid level meter, 11 is a refrigerant pipeline, 12 is a standing area, and 13 is an overflow area. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the technical scheme of the present application will be described clearly and completely in the following description combined with the drawings in the specific embodiments. Obviously, the following described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present patent, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present patent.

[0021] Embodiment 1

[0022] A condensing system for thiflume production, comprising a condenser 2 and a water separation tank 3; the inlet of the condenser 2 is connected with a reaction kettle 1 through a distillation pipe 4; the bottom outlet of the condenser 2 is connected with the water separation tank 3 through a reflux pipe 5; a partition plate one 9 is arranged horizontally in the condenser 2, and the partition plate one 9 is provided with a plurality of through holes; a refrigerant pipeline 11 is arranged above the partition plate one 9; a partition plate two 7 is arranged vertically in the water separation tank 3; the partition plate two 7 divides the water separation tank 3 into a standing area 12 and an overflow area 13; the water outlet end of the reflux pipe 5 is communicated with the standing area 12; the overflow area 13 is provided with an overflow port 6; the height of the overflow port 6 is lower than the height of the partition plate two 7; and the overflow port 6 is connected with the reaction kettle 1 through a liquid separation pipe 8.

[0023] Embodiment 2

[0024] The utility model provides a kind of thiophanate production condensing system, including condenser 2 and water trap 3;The inlet of the condenser 2 is connected with reaction kettle 1 by distillation pipe 4;The bottom outlet of the condenser 2 is connected with water trap 3 by reflux pipe 5;Condenser 2 is equipped with the transverse baffle one 9 inside, and the baffle one 9 is equipped with multiple through holes;The refrigerant pipeline 11 is equipped above the baffle one 9;The refrigerant pipeline 11 is stainless steel material;Water trap 3 is equipped with vertical baffle two 7 inside;The baffle two 7 separates the inside of water trap 3 into stationary zone 12 and overflow area 13;The reflux pipe 5 is inserted into stationary zone 12;The outside of stationary zone 12 is equipped with liquid level meter 10;Overflow area 13 is equipped with overflow port 6;The height of overflow port 6 is lower than the height of baffle two 7;Overflow port 6 is connected with reaction kettle 1 by liquid separation pipe 8, and U-shaped pipe is equipped on the liquid separation pipe 8;The bottom of stationary zone 12 and overflow area 13 is equipped with discharge valve.

[0025] The above description of disclosed embodiments enables those skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A condensing system for thifluzamide production, comprising a condenser and a water trap; the inlet of the condenser is connected with a reaction kettle through a distillation pipe; the bottom outlet of the condenser is connected with the water trap through a reflux pipe; characterized in that, The condenser is internally provided with a transversely arranged partition plate 1, which is provided with a plurality of through holes; a refrigerant pipeline is arranged above the partition plate 1; the water distribution tank is internally provided with a vertically arranged partition plate 2; the partition plate 2 divides the water distribution tank into a standing area and an overflow area; the water outlet end of the reflux pipe is communicated with the standing area; the overflow area is provided with an overflow port; the height of the overflow port is lower than the height of the partition plate 2; the overflow port is connected with the reaction kettle through a liquid distribution pipe.

2. The condensing system for thifluzamide production according to claim 1, wherein The reflux pipe extends into the standing area.

3. The condensing system for thifluzamide production according to claim 1, wherein A liquid level meter is arranged outside the standing area.

4. The condensing system for thifluzamide production according to claim 1, wherein The refrigerant pipeline is made of stainless steel.

5. The condensing system for thifluzamide production according to claim 1, wherein A U-shaped pipe is arranged on the liquid distribution pipe.

6. The condensing system for thifluzamide production according to claim 1, wherein A discharge valve is arranged at the bottom of the standing area and the overflow area.

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