Separation and purification system

Abstract

The utility model belongs to the technical field of separation and purification systems, and particularly relates to a separation and purification system which comprises a waste liquid collecting tank, a filtering tank, a light component rectifying tower and a heavy component rectifying tower, an outlet of the waste liquid collecting tank is connected with an inlet of the filtering tank through a pipeline, an outlet of the filtering tank is connected to an inlet of the light component rectifying tower through a pipeline, and a bottom outlet of the light component rectifying tower is connected with an inlet of the heavy component rectifying tower through a pipeline. Materials are conveyed among the waste liquid collecting tank, the filtering tank, the light component rectifying tower and the heavy component rectifying tower through conveying pumps arranged on pipelines. The device disclosed by the utility model has the beneficial effects that a small amount of magnesium chloride or calcium chloride hydrate is dissolved in the filtrate and is decomposed to generate a small amount of water due to temperature rise in the light component rectifying tower and the heavy component rectifying tower, and azeotrope formed by water and tetrahydrofuran is evaporated out and is removed when passing through the molecular sieve pipeline; therefore, tetrahydrofuran purified by the separation and purification system is higher in purity and lower in water content.

Description

Technical Field

[0001] The utility model belongs to the technical field of separation and purification systems, and particularly relates to a separation and purification system. Background Art

[0002] Tetrahydrofuran (THF), also known as oxolane and 1,4-butylene oxide, is a heterocyclic organic compound with the chemical formula C4H8O. It belongs to the ether class and is the complete hydrogenation product of furan. It is a colorless, transparent liquid that is soluble in water, ethanol, ether, acetone, benzene, etc. It is mainly used as a solvent, chemical synthesis intermediate, and analytical reagent.

[0003] Tetrahydrofuran (THF) is a toxic, volatile organic compound. During industrial manufacturing, THF wastewater must be processed and recovered. Existing THF wastewater recovery and purification systems have low separation and purification rates for THF wastewater with a high water content and fail to completely remove the water, limiting the reuse of the purified THF. Therefore, increasing the purification rate of THF wastewater with a high water content and minimizing the water content in the purified THF have become pressing challenges. Utility Model Content

[0004] In view of the above problems, the utility model provides a separation and purification system.

[0005] The utility model relates to a separation and purification system, comprising a waste liquid collection tank, a filter tank, a light component distillation tower and a heavy component distillation tower;

[0006] The outlet of the waste liquid collection tank is connected to the inlet of the filter tank through a pipeline, the outlet of the filter tank is connected to the inlet of the light component distillation tower through a pipeline, and the bottom outlet of the light component distillation tower is connected to the inlet of the heavy component distillation tower through a pipeline. Materials are transported between the waste liquid collection tank, the filter tank, the light component distillation tower and the heavy component distillation tower through a delivery pump provided on the pipeline.

[0007] Preferably, the upper outlet of the light component distillation tower is connected to a condenser 1 through a pipeline, the side of the condenser 1 away from the light component distillation tower is connected to a reflux tank 1 through a pipeline, the side of the reflux tank 1 away from the light component distillation tower is connected to a reflux pump 1 through a pipeline, the side of the reflux pump 1 away from the reflux tank 1 is respectively connected to the inlet of the light component recovery tank and the upper inlet of the light component distillation tower through pipelines, and switches are provided on the pipelines between the reflux pump 1 and the light component recovery tank and between the light component distillation tower and the reflux pump 1.

[0008] Preferably, the upper outlet of the heavy component distillation tower is connected to a second condenser via a pipeline, the side of the second condenser away from the heavy component distillation tower is connected to a second reflux tank via a pipeline, the side of the second reflux tank away from the heavy component distillation tower is connected to a second reflux pump via a pipeline, the side of the second reflux pump away from the second reflux tank is respectively connected to the inlet of the tetrahydrofuran recovery tank and the upper inlet of the heavy component distillation tower via pipelines, and the switches are provided on the pipelines between the second reflux pump and the tetrahydrofuran recovery tank and between the heavy component distillation tower and the first reflux pump.

[0009] Preferably, the lower outlet of the heavy component distillation tower is connected to a heavy component recovery tank via a pipeline, and the delivery pump is provided on the pipeline between the heavy component distillation tower and the heavy component recovery tank.

[0010] Preferably, the upper half of the filter tank is provided with filter plate 1, filter plate 2 and filter plate 3 from top to bottom, and the filter plate 1, filter plate 2 and filter plate 3 are respectively provided with filter hole 1, filter hole 2 and filter hole 3, and the apertures of the filter hole 1, filter hole 2 and filter hole 3 decrease in sequence.

[0011] Preferably, a stirring paddle is provided in the upper part of the filter tank, a stirring rod of the stirring paddle passes through the filter plate 1 and the filter plate 2, and the stirring rod of the stirring paddle is rotatably connected to the filter plate 1 and the filter plate 2.

[0012] Preferably, the pipeline between the upper outlet of the heavy fraction distillation tower and the second condenser is a molecular sieve pipeline, and a plurality of molecular sieve drying plates are provided inside the molecular sieve pipeline.

[0013] Preferably, the molecular sieve drying plate comprises two circular nets and a plurality of molecular sieves; the outer edges of the two circular nets are fixedly connected to the inner wall of the molecular sieve pipe, the two circular nets are parallel, and the plurality of molecular sieves are laid flat between the two circular nets.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] Compared with the existing technology, the separation and purification system of the utility model is used.

[0016] (1) The separation and purification system sequentially performs magnesium chloride or calcium chloride dehydration, filtration, light component distillation, heavy component distillation and molecular sieve dehydration on tetrahydrofuran waste liquid. For tetrahydrofuran waste liquid with high water content, magnesium chloride or calcium chloride forms hydrates with water in the waste liquid and precipitates, which are then removed through a filter tank, thereby improving the purification rate of the tetrahydrofuran waste liquid;

[0017] (2) A small amount of magnesium chloride or calcium chloride hydrate is dissolved in the filtrate, and decomposes to produce a small amount of water in the light component distillation tower and the heavy component distillation tower due to the increase in temperature. Water and tetrahydrofuran form an azeotrope and are evaporated from the heavy component distillation tower at the same time. When passing through the molecular sieve pipeline, the molecular sieve drying plate can effectively remove water, so that the tetrahydrofuran purified by the separation and purification system has higher purity and lower water content;

[0018] (3) The upper part of the filter tank of the separation and purification system is provided with three filter plates, and the filter holes of the three filter plates have apertures that decrease in sequence from top to bottom, so that magnesium chloride hydrate, calcium chloride hydrate or impurities accumulate on different filter plates according to particle size, thereby preventing a large amount of magnesium chloride hydrate or calcium chloride hydrate produced by tetrahydrofuran with a high water content from accumulating on one filter plate at the same time, causing the filter plate to be blocked, thereby reducing the purification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments:

[0020] Figure 1 Schematic diagram of the separation and purification system provided in Example 1;

[0021] Figure 2 The internal structure diagram of the filter tank provided in Example 1;

[0022] Figure 3 The internal structure diagram of the molecular sieve pipeline provided in Example 1;

[0023] Figure 4 Side view of the molecular sieve pipeline provided in Example 1.

[0024] Description of reference numerals:

[0025] 1—waste liquid collection tank, 2—filter tank, 3—light component distillation tower, 4—heavy component distillation tower, 5—transfer pump, 6—condenser 1, 7—reflux tank 1, 8—reflux pump 1, 9—light component recovery tank, 10—switch, 11—condenser 2, 12—reflux tank 2, 13—reflux pump 2, 14—tetrahydrofuran recovery tank, 15—heavy component recovery tank, 16—filter plate 1, 17—filter plate 2, 18—filter plate 3, 19—stirring paddle, 20—molecular sieve drying plate, 21—round mesh, 22—molecular sieve. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0028] Example 1

[0029] The following combination Figure 1-Figure 4 The utility model is further described as follows. Figure 1-Figure 4 A separation and purification system shown includes a waste liquid collection tank 1, a filter tank 2, a light component distillation tower 3 and a heavy component distillation tower 4.

[0030] like Figure 1-Figure 4 As shown, the outlet of the waste liquid collection tank 1 is connected to the inlet of the filter tank 2 through a pipeline, the outlet of the filter tank 2 is connected to the inlet of the light component distillation tower 3 through a pipeline, and the bottom outlet of the light component distillation tower is connected to the inlet of the heavy component distillation tower 4 through a pipeline. Materials are transported between the waste liquid collection tank 1, the filter tank 2, the light component distillation tower 3 and the heavy component distillation tower 4 through a delivery pump 5 provided on the pipeline.

[0031] like Figure 1-Figure 4 As shown, the upper outlet of the light component distillation tower 3 is connected to a condenser 6 through a pipeline, the side of the condenser 6 away from the light component distillation tower 3 is connected to a reflux tank 7 through a pipeline, the side of the reflux tank 7 away from the light component distillation tower 3 is connected to a reflux pump 8 through a pipeline, the side of the reflux pump 8 away from the reflux tank 7 is connected to the inlet of the light component recovery tank 9 and the upper inlet of the light component distillation tower 3 through pipelines, and switches 10 are provided on the pipelines between the reflux pump 8 and the light component recovery tank 9 and between the light component distillation tower 3 and the reflux pump 8.

[0032] like Figure 1-Figure 4 As shown, the upper outlet of the heavy component distillation tower 4 is connected to a second condenser 11 through a pipeline, the side of the second condenser 11 away from the heavy component distillation tower 4 is connected to a second reflux tank 12 through a pipeline, the side of the second reflux tank 12 away from the heavy component distillation tower 4 is connected to a second reflux pump 13 through a pipeline, and the side of the second reflux pump 13 away from the second reflux tank 12 is connected to the inlet of the tetrahydrofuran recovery tank 14 and the upper inlet of the heavy component distillation tower 4 through pipelines respectively, and switches 10 are provided on the pipelines between the second reflux pump 13 and the tetrahydrofuran recovery tank 14 and between the heavy component distillation tower 4 and the reflux pump 18.

[0033] like Figure 1-Figure 4 As shown, the lower outlet of the heavy component distillation tower 4 is connected to the heavy component recovery tank 15 through a pipeline, and a delivery pump 5 is provided on the pipeline between the heavy component distillation tower 4 and the heavy component recovery tank 15.

[0034] like Figure 1-Figure 4As shown, the upper half of the filter tank 2 is provided with filter plate 1 16, filter plate 2 17 and filter plate 3 18 from top to bottom. Filter plate 1 16, filter plate 2 17 and filter plate 3 18 are respectively provided with filter hole 1, filter hole 2 and filter hole 3, and the apertures of filter hole 1, filter hole 2 and filter hole 3 decrease in sequence.

[0035] like Figure 1-Figure 4 As shown, a stirring paddle 19 is provided in the upper part of the filter tank 2. The stirring rod of the stirring paddle 19 passes through the filter plate 16 and the filter plate 2 17. The stirring rod of the stirring paddle 19 is rotatably connected to the filter plate 16 and the filter plate 2 17.

[0036] like Figure 1-Figure 4 As shown, the pipeline between the upper outlet of the heavy component distillation tower 4 and the second condenser 11 is a molecular sieve pipeline, and a plurality of molecular sieve drying plates 20 are provided inside the molecular sieve pipeline.

[0037] like Figure 1-Figure 4 As shown, the molecular sieve drying plate 20 includes two circular nets 21 and multiple molecular sieves 22; the outer edges of the two circular nets 21 are fixedly connected to the inner wall of the molecular sieve pipe, the two circular nets 21 are parallel, and the multiple molecular sieves 22 are laid flat between the two circular nets 21.

[0038] The working process of the separation and purification system is:

[0039] After the tetrahydrofuran waste liquid enters the waste liquid collection tank 1, stirring is started, and magnesium chloride or calcium chloride is added to the waste liquid collection tank 1. The magnesium chloride or calcium chloride forms a hydrate with water in the tetrahydrofuran waste liquid and precipitates; the tetrahydrofuran waste liquid is then transported to the filter tank 2 for filtration; the filtered tetrahydrofuran waste liquid is transported to the light component distillation tower 3, and the evaporated light component is condensed by the condenser 6 and transported to the reflux tank 7. After passing the test, it is transported to the light component recovery tank 9, or if it fails the test (the tetrahydrofuran content exceeds the maximum limit), it is transported to the light component recovery tank 9. ) is refluxed to the light component distillation tower 3 again; the tetrahydrofuran waste liquid not evaporated in the light component distillation tower 3 is conveyed to the heavy component distillation tower 4, the evaporated tetrahydrofuran vapor passes through a molecular sieve pipe to remove water, is condensed in the second condenser 11, and is conveyed to the second reflux tank 12. After passing the test, it is conveyed to the tetrahydrofuran recovery tank 14, or if it fails the test (the tetrahydrofuran content is below the minimum limit), it is refluxed to the heavy component distillation tower 4 again; the tetrahydrofuran waste liquid not evaporated in the heavy component distillation tower 4 is conveyed to the heavy component recovery tank 15.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A separation and purification system, characterized in that: It includes a waste liquid collection tank (1), a filter tank (2), a light component distillation tower (3) and a heavy component distillation tower (4); The outlet of the waste liquid collection tank (1) is connected to the inlet of the filter tank (2) via a pipeline, the outlet of the filter tank (2) is connected to the inlet of the light component distillation tower (3) via a pipeline, the bottom outlet of the light component distillation tower is connected to the inlet of the heavy component distillation tower (4) via a pipeline, and materials are transported between the waste liquid collection tank (1), the filter tank (2), the light component distillation tower (3) and the heavy component distillation tower (4) via a delivery pump (5) provided on the pipeline.

2. The separation and purification system according to claim 1, characterized in that: The upper outlet of the light component distillation tower (3) is connected to a condenser (6) through a pipeline, the side of the condenser (6) away from the light component distillation tower (3) is connected to a reflux tank (7) through a pipeline, the side of the reflux tank (7) away from the light component distillation tower (3) is connected to a reflux pump (8) through a pipeline, the side of the reflux pump (8) away from the reflux tank (7) is connected to the inlet of the light component recovery tank (9) and the upper inlet of the light component distillation tower (3) through pipelines, and switches (10) are provided on the pipelines between the reflux pump (8) and the light component recovery tank (9) and the light component distillation tower (3) and the reflux pump (8).

3. The separation and purification system according to claim 2, characterized in that: The upper outlet of the heavy component distillation tower (4) is connected to a second condenser (11) through a pipeline, and the side of the second condenser (11) away from the heavy component distillation tower (4) is connected to a second reflux tank (12) through a pipeline, and the side of the second reflux tank (12) away from the heavy component distillation tower (4) is connected to a second reflux pump (13) through a pipeline, and the side of the second reflux pump (13) away from the second reflux tank (12) is respectively connected to the inlet of the tetrahydrofuran recovery tank (14) and the upper inlet of the heavy component distillation tower (4) through pipelines, and the switch (10) is provided on the pipelines between the second reflux pump (13) and the tetrahydrofuran recovery tank (14) and the heavy component distillation tower (4) and the first reflux pump (8).

4. The separation and purification system according to claim 3, characterized in that: The lower outlet of the heavy component distillation tower (4) is connected to a heavy component recovery tank (15) via a pipeline, and the delivery pump (5) is provided on the pipeline between the heavy component distillation tower (4) and the heavy component recovery tank (15).

5. The separation and purification system according to claim 4, characterized in that: The upper part of the filter tank (2) is provided with filter plate 1 (16), filter plate 2 (17) and filter plate 3 (18) from top to bottom, and filter hole 1, filter hole 2 and filter hole 3 are respectively opened on the filter plate 1 (16), filter plate 2 (17) and filter plate 3 (18), and the apertures of the filter hole 1, filter hole 2 and filter hole 3 decrease in sequence.

6. The separation and purification system according to claim 5, characterized in that: The upper portion of the filter tank (2) is provided with a stirring paddle (19), the stirring rod of the stirring paddle (19) passes through the filter plate 1 (16) and the filter plate 2 (17), and the stirring rod of the stirring paddle (19) is rotatably connected to the filter plate 1 (16) and the filter plate 2 (17).

7. The separation and purification system according to claim 6, characterized in that: The pipeline between the upper outlet of the heavy component distillation tower (4) and the second condenser (11) is a molecular sieve pipeline, and a plurality of molecular sieve drying plates (20) are provided inside the molecular sieve pipeline.

8. The separation and purification system according to claim 7, characterized in that: The molecular sieve drying plate (20) comprises two circular nets (21) and a plurality of molecular sieves (22); the outer edges of the two circular nets (21) are fixedly connected to the inner wall of the molecular sieve pipe, the two circular nets (21) are parallel, and the plurality of molecular sieves (22) are laid flat between the two circular nets (21).

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