Solvent removal device

Abstract

The utility model provides a solvent removal device which comprises a vacuum distillation still and a heat exchange box, a condensation pipeline and a heat exchange pipeline are arranged in the heat exchange box, the condensation pipeline is connected with the vacuum distillation still through an exhaust pipe, the condensation pipeline is connected with a liquid collection tank, the heat exchange pipeline is connected with the vacuum distillation still through a liquid extraction device I, and the liquid extraction device II is connected with the liquid collection tank. The heat exchange box is connected with a feeding pipe and a heat preservation tank, and the heat preservation tank is connected with the vacuum distillation kettle through a liquid pumping device II. According to the vacuum distillation kettle, heat generated during solvent removal can be recycled, heat waste is avoided, when the solvent is removed from the hot solution, the solvent removal efficiency can be improved, and the heating energy consumption of the vacuum distillation kettle is reduced.

Description

Technical Field

[0001] This application relates to solvent removal technology, and more particularly to a solvent removal apparatus. Background Technology

[0002] In the production process of tebuconazole, after obtaining the intermediate 5-(4-chlorobenzyl)-2,2-dimethyl-cyclopentanone, it is necessary to perform vacuum heating distillation to remove the solvent and obtain a pure 5-(4-chlorobenzyl)-2,2-dimethyl-cyclopentanone solution.

[0003] Currently, 5-(4-chlorobenzyl)-2,2-dimethyl-cyclopentanone is typically distilled and solvent-removed in a vacuum distillation vessel. However, during the distillation of 5-(4-chlorobenzyl)-2,2-dimethyl-cyclopentanone, the generated solvent vapor is directly condensed and recovered through a condenser. Furthermore, after distillation, the 5-(4-chlorobenzyl)-2,2-dimethyl-cyclopentanone solution is usually directly transferred to the next process. This results in the direct loss of heat from the solvent vapor and the 5-(4-chlorobenzyl)-2,2-dimethyl-cyclopentanone solution, leading to ineffective heat utilization and heat waste. Utility Model Content

[0004] This application provides a solvent removal device to solve the problem of heat waste during the distillation and solvent removal process of 5-(4-chlorobenzyl)-2,2-dimethyl-cyclopentanone.

[0005] This application provides a solvent removal device, including a vacuum distillation kettle and a heat exchange box, wherein the heat exchange box is provided with a condensation pipe and a heat exchange pipe inside;

[0006] The condenser pipe is connected to the vacuum distillation kettle via an exhaust pipe, and the condenser pipe is also connected to a liquid collection tank.

[0007] The heat exchange pipeline is connected to the vacuum distillation kettle via the liquid extraction device I;

[0008] The heat exchange box is connected to a feed pipe and an insulation tank, and the insulation tank is connected to a vacuum distillation kettle through a liquid extraction device II.

[0009] Optionally, both the condenser pipe and the heat exchange pipe have a spiral structure.

[0010] Optionally, both the liquid extraction device I and the liquid extraction device II include a liquid extraction pump, with the inlet end of the liquid extraction pump connected to an inlet pipe and the outlet end of the liquid extraction pump connected to an outlet pipe.

[0011] A valve is installed on the liquid inlet pipe.

[0012] Optionally, the heat exchange box has an insulation layer on its outer wall.

[0013] Optionally, the upper part of the vacuum distillation vessel is provided with an evaporation tank, and the liquid outlet pipe of the liquid extraction device II extends into the interior of the evaporation tank;

[0014] The inlet pipe of the pumping device II is connected to a connecting pipe with a valve;

[0015] The connecting pipeline and the inlet pipeline of the liquid extraction device I are simultaneously connected to the lower end of the vacuum distillation kettle via a tee.

[0016] Optionally, the evaporation tank has a spiral tank structure.

[0017] The solvent removal apparatus provided in this application comprises a vacuum distillation kettle and a heat exchange box. The heat exchange box contains condenser pipes and heat exchange pipes. The condenser pipes are connected to the vacuum distillation kettle via an exhaust pipe and are also connected to a collection tank. The heat exchange pipes are connected to the vacuum distillation kettle via a pumping device I. The heat exchange box is connected to a feed pipe and a heat-insulating tank, which is connected to the vacuum distillation kettle via a pumping device II. During solvent removal, the solution first enters the heat exchange box and then flows from the heat exchange box into the heat-insulating tank. The pumping device II draws a certain amount of solution from the heat-insulating tank into the vacuum distillation kettle for heating and solvent removal. The solvent vapor generated during solvent removal enters the condenser pipes, and the solution in the heat exchange box absorbs the heat from the solvent vapor, forming a hot solution. The solution is temporarily stored in an insulated tank, while the solvent vapor is condensed. After the solvent is completely removed from the solution in the vacuum distillation kettle, a pure solution is formed. The pumping device I pumps the pure solution into the heat exchange tube. The solution in the heat exchange box absorbs the heat from the pure solution to form a hot solution, which is then temporarily stored in the insulated tank. The pure solution flows out from the heat exchange tube to the next process. After all the pure solution in the vacuum distillation kettle is discharged, the hot solution in the insulated tank is pumped into the vacuum distillation kettle to continue the solvent removal process. Compared with the existing solvent removal methods, this method not only recovers and utilizes the heat generated during solvent removal, avoiding heat waste, but also improves the efficiency of solvent removal and reduces the heating energy consumption of the vacuum distillation kettle when removing solvent from the hot solution. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Fig. 1 This is a schematic front view of the solvent removal apparatus provided in the embodiments of this application;

[0020] Fig. 2This is a schematic diagram of the main cross-sectional structure of the heat exchanger of the solvent removal device provided in the embodiments of this application;

[0021] Fig. 3 This is a schematic diagram of the main cross-sectional structure of the vacuum distillation vessel of the solvent removal apparatus provided in the embodiments of this application.

[0022] Explanation of reference numerals in the attached drawings: 1. Vacuum distillation vessel; 2. Heat exchange box; 3. Condensation pipe; 4. Heat exchange pipe; 5. Exhaust pipe; 6. Liquid collection tank; 7. Feed pipe; 8. Insulation tank; 9. Evaporation tank; 10. Connecting pipe; 11. Tee; 11. Flow port I; 111. Flow port II; 112. Flow port III; 113.

[0023] Liquid extraction device I 12, liquid extraction device II 13, liquid extraction pump (121, 131), liquid inlet pipeline (122, 132), liquid outlet pipeline (123, 133);

[0024] Valve I 13, Valve II 14, Valve III 15. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0026] like Figs. 1-3 As shown:

[0027] One embodiment of this application provides a solvent removal device, including a vacuum distillation kettle 1 and a heat exchange box 2. The heat exchange box 2 is equipped with a condenser pipe 3 and a heat exchange pipe 4 inside. Specifically, the condenser pipe 3 and the heat exchange pipe 4 are both vertically distributed inside the heat exchange box 2.

[0028] The condenser pipe 3 is connected to the vacuum distillation vessel 1 via the exhaust pipe 5, and the condenser pipe 3 is also connected to the collection tank 6. Specifically, the upper end of the condenser pipe 3 is connected to the upper end of the vacuum distillation vessel 1 via the exhaust pipe 5, and the lower end of the condenser pipe 3 is connected to the collection tank 6, which is used to collect condensate.

[0029] The heat exchange pipeline 4 is connected to the vacuum distillation vessel 1 via the liquid extraction device I12. Specifically, the lower end of the heat exchange pipeline 4 is connected to the lower end of the vacuum distillation vessel 1 via the liquid extraction device I12.

[0030] The heat exchanger 2 is connected to the feed pipe 7 and the insulation tank 8, and the insulation tank 8 is connected to the vacuum distillation kettle 1 through the liquid extraction device II 13. Specifically, the lower end of the insulation tank 8 is connected to the upper part of the vacuum distillation kettle 1 through the liquid extraction device II 13.

[0031] In this embodiment, a temporary storage tank is connected to the upper end of the heat exchange pipeline 4 to temporarily store the solution after solvent removal. The feed pipe 7 is connected to the solution delivery pipeline. The vacuum distillation vessel 1 is prior art and will not be described in detail.

[0032] In use, the solution (without solvent removal) first enters the heat exchanger 2 through the feed pipe 7, and then enters the insulation tank 8 through the heat exchanger 2. The liquid extraction device II 13 draws a certain amount of the solution (without solvent removal) from the insulation tank 8 into the vacuum distillation kettle 1 for heating and solvent removal. The solvent vapor generated during solvent removal enters the condenser pipe 3. The solution (without solvent removal) in the heat exchanger 2 absorbs the heat from the solvent vapor to form a hot solution (without solvent removal), which is then temporarily stored in the insulation tank 8. Meanwhile, the solvent vapor is condensed to form condensate, which flows into the collection tank. The solution is stored in the tank. After the solvent is completely removed from the solution in the vacuum distillation kettle 1, a pure solution is formed. The liquid pumping device I12 pumps the pure solution into the heat exchange tube. The solution in the heat exchange box 2 (without solvent removal) absorbs the heat from the pure solution to form a hot solution (without solvent removal), which is then temporarily stored in the heat preservation tank 8. The pure solution flows out from the heat exchange pipe 4 to the next process. After all the pure solution in the vacuum distillation kettle 1 is discharged, the hot solution (without solvent removal) in the heat preservation tank 8 is pumped into the vacuum distillation kettle 1 to continue the solvent removal process.

[0033] The solvent removal device provided in this embodiment includes a vacuum distillation kettle 1 and a heat exchange box 2. The heat exchange box 2 is equipped with a condenser pipe 3 and a heat exchange pipe 4. The condenser pipe 3 is connected to the vacuum distillation kettle 1 through an exhaust pipe 5 and is also connected to a liquid collection tank 6. The heat exchange pipe 4 is connected to the vacuum distillation kettle 1 through a liquid extraction device I 12. The heat exchange box 2 is connected to a feed pipe 7 and a heat preservation tank 8. The heat preservation tank 8 is connected to the vacuum distillation kettle 1 through a liquid extraction device II 13. This design not only recovers and utilizes the heat generated during solvent removal, avoiding heat waste, but also improves the efficiency of solvent removal from hot solutions and reduces the heating energy consumption of the vacuum distillation kettle 1.

[0034] In some embodiments of this application, both the condenser pipe 3 and the heat exchange pipe 4 have a spiral structure to improve the heat exchange effect.

[0035] In some embodiments of this application, both the liquid extraction device I 12 and the liquid extraction device II 13 include a liquid extraction pump (121, 131), the inlet end of the liquid extraction pump is connected to an inlet pipe (122, 132), and the outlet end of the liquid extraction pump is connected to an outlet pipe (123, 133).

[0036] Valves are installed on the liquid inlet lines (122, 132).

[0037] In this embodiment, the outlet pipe 123 of the liquid extraction device I 12 is connected to the lower end of the heat exchange pipe 4, and the inlet pipe 122 of the liquid extraction device I 12 is connected to the lower end of the vacuum distillation vessel 1. The outlet pipe 133 of the liquid extraction device II 13 is connected to the upper part of the vacuum distillation vessel 1, and the inlet pipe 132 of the liquid extraction device II 13 is connected to the lower end of the heat preservation tank 8. The valve installed on the inlet pipe 122 of the liquid extraction device I 12 is designated as valve I 13, and the valve installed on the inlet pipe 132 of the liquid extraction device II 13 is designated as valve II 14.

[0038] In use, close valve I13 and open valve II14. The pump 131 of the pumping device II13 will pump the solution in the heat preservation tank 8 that has not been desolventized to the vacuum distillation kettle 1 for distillation to remove the solvent. After the solvent is removed, close valve II14 and open valve I13. The pump 121 of the pumping device I12 will pump the solution after solvent removal to the heat exchange pipeline 4 for heat exchange.

[0039] In some embodiments of this application, the outer wall of the heat exchange box 2 is provided with an insulation layer to prevent heat loss.

[0040] In some embodiments of this application, an evaporation tank 9 is provided in the upper part of the vacuum distillation vessel 1, and the liquid outlet pipe 133 of the liquid extraction device II 13 extends into the interior of the evaporation tank 9.

[0041] The inlet pipe 132 of the liquid extraction device II13 is connected to a connecting pipe 10 with a valve.

[0042] The inlet pipe 122 of the connecting pipe 10 and the liquid pumping device I 12 is simultaneously connected to the lower end of the vacuum distillation vessel 1 via a tee 11.

[0043] Specifically, the three-way valve 11 includes outlet I 111, outlet II 112 and outlet III 113. Outlet I 111 is connected to the lower end of the vacuum distillation vessel 1, outlet II 112 is connected to the inlet pipe 132 of the liquid pumping device II 13 through the connecting pipe 10, and outlet III 113 is connected to the inlet pipe 122 of the liquid pumping device I 12.

[0044] In this embodiment, the valve installed on the connecting pipe 10 is designated as valve Ⅲ15.

[0045] In use, close valves I13 and III15, and open valve II14. The pump 131 of the pumping device II13 draws the solution in the heat preservation tank 8 that has not been desolventized to the vacuum distillation kettle 1 for distillation to remove the solvent. During solvent removal, close valves I13 and II14, and open valve III15. The pump 131 of the pumping device II13 draws the solution in the vacuum distillation kettle 1 to the evaporation tank 9. The solution flows back into the vacuum distillation kettle 1 along the evaporation tank 9, allowing the solution to circulate. When the solution flows along the evaporation tank 9, the solvent evaporates more easily, thereby improving the solvent removal effect. After the solvent removal is completed, close valves II14 and III15, and open valve I13. The pump 121 of the pumping device I12 draws the solvent-removed solution to the heat exchange pipeline 4 for heat exchange.

[0046] In some embodiments of this application, the evaporation tank 9 has a spiral tank structure, which is used to increase the flow time of the solution in the evaporation tank 9 and improve the evaporation effect of the solvent in the evaporation tank 9.

[0047] In some embodiments of this application, valve I13, valve II14 and valve III15 are all electric valves, which facilitates opening and closing of the valves.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A solvent removal apparatus, comprising a vacuum distillation vessel (1), characterized in that: It also includes a heat exchange box (2), the interior of which is provided with a condenser pipe (3) and a heat exchange pipe (4); The condenser pipe (3) is connected to the vacuum distillation vessel (1) through the exhaust pipe (5), and the condenser pipe (3) is connected to the liquid collection tank (6). The heat exchange pipeline (4) is connected to the vacuum distillation vessel (1) via the liquid extraction device I (12); The heat exchange box (2) is connected to a feed pipe (7) and a heat preservation tank (8), and the heat preservation tank (8) is connected to the vacuum distillation kettle (1) through a liquid extraction device II (13).

2. The solvent removal apparatus according to claim 1, characterized in that: Both the condenser pipe (3) and the heat exchange pipe (4) are spiral structures.

3. The solvent removal apparatus according to claim 1, characterized in that: Both the pumping device I (12) and the pumping device II (13) include pumping pumps (121, 131), the inlet end of the pumping pumps (121, 131) is connected to the inlet pipe (122, 132), and the outlet end of the pumping pumps (121, 131) is connected to the outlet pipe (123, 133). Valves are installed on the liquid inlet pipes (122, 132).

4. The solvent removal apparatus according to claim 3, characterized in that: The heat exchange box (2) has an insulation layer on its outer wall.

5. The solvent removal apparatus according to claim 3, characterized in that: The upper part of the vacuum distillation vessel (1) is provided with an evaporation tank (9), and the liquid outlet pipe (133) of the liquid pumping device II (13) extends into the interior of the evaporation tank (9); The inlet pipe (132) of the pumping device II (13) is connected to a connecting pipe (10) with a valve. The connecting pipe (10) and the liquid inlet pipe (122) of the liquid extraction device I (12) are simultaneously connected to the lower end of the vacuum distillation vessel (1) via a tee.

6. The solvent removal apparatus according to claim 5, characterized in that: The evaporation tank (9) has a spiral groove structure.

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