Butanedisulfonic acid sodium filtration desalination equipment

Abstract

The utility model discloses butanedisulfonic acid sodium filtration desalting equipment, and belongs to the field of chemical equipment. Which comprises a liquid storage tank (3) and desalting membrane groups, a feeding pump (4) is connected with the liquid storage tank (3) and the desalting membrane groups, and a pure water pipe (2) for feeding pure water and a raw material pipe (1) for feeding sodium butanedisulfonate are mounted on the liquid storage tank (3). The emptying mechanism comprises an emptying pump (15), and an inlet of the emptying pump (15) is connected with the liquid storage tank (3), the feeding pump (4) and each nanofiltration membrane through an emptying pipeline. According to the sodium butanedisulfonate filtering and removing equipment, the emptying mechanism is arranged, so that residual liquid in the equipment can be conveniently emptied during parking, and damage caused by residual liquid in the equipment is avoided.

Description

TECHNICAL FIELD

[0001] The sodium butanedisulfonate filter desalination equipment belongs to the field of chemical equipment. BACKGROUND

[0002] 1,4-Butanedisulfonic acid disodium has multiple uses in the chemical industry, and it is often used as an oxidizing agent and bleaching agent for bleaching pulp, fibers and textiles. Various chemical raw materials including 1,4-butane disulfonic acid disodium need to be desalted. The traditional desalination method mainly includes distillation method, freezing method, ion exchange method and membrane method. Among them, the membrane method mainly uses the filtering effect of nanofiltration membrane, ultrafiltration membrane, reverse osmosis membrane and other materials to realize desalination. Membrane desalination has become a more common way in the existing technology.

[0003] In the prior art, some technical solutions for membrane desalination have also appeared, such as: the technical solution disclosed in the Chinese utility model patent with the application number 201120250253.6, the application date of July 15, 2011, and the patent name of "Physical desalination device"; the technical solution disclosed in the Chinese invention patent with the application number 201210248085.6, the application date of July 18, 2012, and the patent name of "Water desalination method"; the technical solution disclosed in the Chinese invention patent with the application number 202010712966.3, the application date of July 22, 2020, and the patent name of "Comprehensive desalination and pure water recovery method and system for multi-element heavy metal salt-containing wastewater"; the technical solution disclosed in the Chinese utility model patent with the application number 202323618734.X, the application date of December 29, 2023, and the patent name of "Concentrated salt water recovery device".

[0004] The technical solutions including the above-mentioned membrane desalination generally have the following defects in actual implementation: (1) taking nanofiltration membrane as an example, as the membrane desalination proceeds, the concentration of the retained substance is continuously retained at the nanofiltration membrane, and the salt concentration on the membrane surface continuously increases, thereby forming a concentration polarization phenomenon on the membrane surface, thus hindering the desalination efficiency. (2) When the desalination operation is stopped, residues of raw materials or retained substances will be formed at various places of the desalination equipment, which will cause damage to the desalination equipment over a long period of time. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a sodium butanedisulfonate filter desalination equipment which is convenient to empty the residual liquid in the equipment when it is stopped, and avoids damage caused by the residual liquid in the equipment.

[0006] The utility model discloses a technical scheme that solves its technical problem is adopted: the technical scheme that this sodium butanedisulfonate filter desalination equipment, including liquid storage tank and desalination membrane group, feed pump connects liquid storage tank and desalination membrane group, install on the liquid storage tank for sending in pure water's pure water pipe and for sending in sodium butanedisulfonate's raw material pipe, its characterized in that: desalination membrane group is provided with at least one group, and each desalination membrane group includes at least one nanofiltration membrane, is provided with emptying mechanism, and the emptying mechanism includes emptying pump, and the inlet of emptying pump is connected with liquid storage tank, feed pump and every nanofiltration membrane through emptying pipeline.

[0007] Preferably, the desalination membrane group is provided with multiple groups, each group including two nanofiltration membranes: a first nanofiltration membrane and a second nanofiltration membrane, the first nanofiltration membrane and the second nanofiltration membrane are connected in series, and the inlet and outlet of the first nanofiltration membrane and the second nanofiltration membrane are connected by the emptying pump through the emptying pipeline.

[0008] Preferably, the desalination membrane group is provided with two groups, each group including two nanofiltration membranes: a first nanofiltration membrane and a second nanofiltration membrane, and a circulating pump is further provided, the outlet of the feed pump is connected to the inlet of the circulating pump, and the outlet of the circulating pump is connected to the inlet of the first nanofiltration membrane in each desalination membrane group.

[0009] Preferably, the filtrate outlets of the first nanofiltration membrane and the second nanofiltration membrane in each desalination membrane group are connected by a pipeline to form a filtrate outlet of the desalination membrane group, and the concentrated liquid outlets of the first nanofiltration membrane and the second nanofiltration membrane in each desalination membrane group are connected by a pipeline to form a retentate outlet of the desalination membrane group.

[0010] Preferably, a heat exchanger is further provided, the filtrate outlet of the desalination membrane group is connected to the high-temperature medium inlet of the heat exchanger through the first backflow valve and the second backflow valve, the other end of the first backflow valve is connected to the liquid storage tank, the high-temperature medium outlet of the heat exchanger is connected to the outlet of the feed pump through a pipeline, and the inlet of the emptying pump is connected to the high-temperature medium inlet and the high-temperature medium outlet of the heat exchanger through the emptying pipeline.

[0011] Preferably, a normally closed emptying valve is arranged on each emptying pipeline connected to the emptying pump.

[0012] Preferably, the inlet of the feed pump is connected to the bottom outlet of the liquid storage tank, the outlet of the feed pump is connected to the inlet of the pre-filter through a pipeline, the outlet of the pre-filter is connected to the inlet of the high-pressure pump, the outlet of the high-pressure pump is connected to the inlet of the circulating pump, and the inlet of the emptying pump is connected to the inlets and outlets of the feed pump, the high-pressure pump and the circulating pump through the emptying pipeline.

[0013] Preferably, a normally closed butterfly valve is further connected between the inlet and the outlet of the pre-filter, and the inlet of the emptying pump is connected to the outlet of the pre-filter through the emptying pipeline.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] In this sodium succinate desalination equipment, an emptying mechanism is installed to facilitate the emptying of residual liquid in the equipment when it is shut down, thus avoiding damage caused by liquid residue in the equipment.

[0016] During the filtration process of the desalination membrane unit, the circulation pump is turned on simultaneously. Since the two first nanofiltration membranes are primary filters, the concentration of the concentrate is more likely to increase on the membrane surface. The circulation pump increases the flow rate on the inner surface of the first nanofiltration membrane, thus preventing the filtration effect from decreasing due to concentration polarization within the first nanofiltration membrane.

[0017] This sodium succinate filtration desalination equipment is equipped with two sets of desalination membrane groups, each consisting of two nanofiltration membranes connected in series, which improves the desalination efficiency. Furthermore, butterfly valves are installed at the inlet of each of the two sets of desalination membrane groups, allowing them to operate simultaneously or alternately. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a nanofiltration desalination device for succinic acid.

[0019] The components include: 1. Raw material pipe; 2. Pure water pipe; 3. Storage tank; 4. Feed pump; 5. Pre-filter; 6. High-pressure pump; 7. Heat exchanger; 8. Circulation pump; 9. First nanofiltration membrane; 10. First reflux valve; 11. Second nanofiltration membrane; 12. Second reflux valve; 13. Third reflux valve; 14. Fourth reflux valve; 15. Drain pump; 16. Main drain pipe; 17. Drain branch pipe; 18. Drain valve. Detailed Implementation

[0020] Figure 1 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figure 1 The present invention will be further described below.

[0021] like Figure 1 As shown, a sodium succinate desalination device (hereinafter referred to as the desalination device) includes a storage tank 3. A raw material pipe 1 for feeding sodium succinate and a pure water pipe 2 for feeding pure water are installed on the upper part of the storage tank 3. Sodium succinate and pure water are mixed into a solution within the storage tank 3. An output pipe is installed at the bottom outlet of the storage tank 3, connecting to the inlet of a feed pump 4. The outlet of the feed pump 4 is connected to the inlet of a pre-filter 5 via a pipeline. Butterfly valves are installed at the inlets of the feed pump 4, and a check valve is installed on the pipeline between the feed pump 4 and the pre-filter 5. Normally closed butterfly valves are also installed at the inlet and outlet of the pre-filter 5.

[0022] The outlet of the pre-filter 5 is connected to the inlet of the high-pressure pump 6 through a pipeline, the outlet of the high-pressure pump 6 is connected to the inlet of the circulating pump 8 through a pipeline, and the outlet of the circulating pump 8 is connected to the desalination membrane group. In the present desalination device, the desalination membrane group is composed of a first nanofiltration membrane 9 and a corresponding second nanofiltration membrane 11. In the present desalination device, the desalination membrane group is provided with two groups. Butterfly valves are arranged at the inlets of the first nanofiltration membranes 9 of the two groups of desalination membrane groups, so that the two groups of desalination membrane groups can be used simultaneously or alternately.

[0023] Taking one of the two groups of desalination membrane groups as an example: the outlet of the circulating pump 8 is connected to the liquid inlet of the first nanofiltration membrane 9 in the desalination membrane group through a pipeline. The filtrate outlet of the first nanofiltration membrane 9 is connected to the liquid inlet of the second nanofiltration membrane 11 through a pipeline, the outlet of the circulating pump 8 is connected to the liquid inlets of the first nanofiltration membranes 9 in the two groups of desalination membrane groups through a pipeline, the filtrate outlets of the two second nanofiltration membranes 11 in the two groups of desalination membrane groups are connected to one place through a pipeline to form the filtrate outlet of the desalination membrane group, and the filtrate outlets of the four nanofiltration membranes in the two groups of desalination membrane groups are connected to one place through a pipeline to form the retentate outlet of the desalination membrane group.

[0024] The filtrate outlet of the desalination membrane group is connected to the first backflow valve 10, the second backflow valve 12 and the high-temperature medium inlet of the heat exchanger 7, the other end of the first backflow valve 10 returns to the liquid storage tank 3, and the second backflow valve 12 is a normally closed butterfly valve which is opened when needed. In the heat exchanger 7, the filtrate acts as a high-temperature medium and exchanges heat with a low-temperature medium connected to the heat exchanger 7, and then is connected to the inlet of the circulating pump 8 through a pipeline. The retentate outlet of the desalination membrane group is connected to one end of the third backflow valve 13 and the fourth backflow valve 14 through a pipeline, the other end of the third backflow valve 13 returns to the liquid storage tank 3 through a pipeline, and the other end of the fourth backflow valve 14 is connected to a subsequent process.

[0025] In the present desalination device, an emptying mechanism is also provided, which includes an emptying pump 15, and the inlet of the emptying pump 15 is connected to an emptying main pipe 16. A plurality of emptying branch pipes 17 are led out from the emptying main pipe 16, and the plurality of emptying branch pipes 17 are respectively connected to: the outlet of the liquid storage tank 3, the outlet of the pre-filter 5 (i.e. the inlet of the feed pump 4), the inlet of the circulating pump 8 (i.e. the outlet of the feed pump 4 and the high-temperature medium outlet of the heat exchanger 7), the inlet of the first nanofiltration membrane 9 in the desalination membrane group (i.e. the outlet of the circulating pump 8), the outlet of the first nanofiltration membrane 9 (i.e. the inlet of the second nanofiltration membrane 11), the outlet of the second nanofiltration membrane 11 and the high-temperature medium inlet of the heat exchanger 7. An emptying valve 18 in a normally closed state is arranged on each emptying branch pipe 17.

[0026] The specific working process and working principle are as follows:

[0027] The pure water and the sodium butanedioate raw material are respectively sent into the liquid storage tank 3 through the pure water pipe 2 and the raw material pipe 1 to form a solution, and the solution is filtered through the pre-filter 5 under the action of the feed pump 4 and then enters the desalination membrane group. The solutions entering the two groups of desalination membrane groups respectively are filtered through the first nanofiltration membrane 9 and the second nanofiltration membrane 11, and the filtrate and the concentrated liquid (retentate) are output. The output filtrate is partly returned to the inlet of the circulating pump 8 after being cooled in the heat exchanger 7, and the other part is returned to the liquid storage tank 3 through the first backflow valve 10 to participate in the formation of the solution, and the second backflow valve 12 is in a normally closed state and is opened when the filtrate needs to be discharged. Part of the concentrated liquid output by the two groups of desalination membrane groups is returned to the liquid storage tank 3 through the third backflow valve 13 to participate in the desalination treatment, and the other part of the concentrated liquid is output through the fourth backflow valve 14 and flows to the subsequent process.

[0028] During the filtering process of the desalination membrane group, the circulating pump 8 is started at the same time. Since the two first nanofiltration membranes 9 are primary filtration, the concentration of the concentrated liquid on the membrane surface is more likely to increase. The circulating pump 8 increases the flow rate of the membrane surface in the first nanofiltration membrane 9, so as to avoid the decline of the filtering effect caused by the concentration polarization phenomenon in the first nanofiltration membrane 9.

[0029] When the desalination treatment is stopped, all the emptying valves in the emptying branch pipes 17 are opened, and the emptying pump 15 is started. Under the action of the emptying pump 15, the liquid in the liquid storage tank 3, the pre-filter 5, the feed pump 4, the circulating pump 8, the first nanofiltration membrane 9, the second nanofiltration membrane 11 and the heat exchanger 7 is discharged to avoid the residue of the solution.

[0030] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to obtain equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application without departing from the technical solution of the present application still fall within the protection scope of the present application.

Claims

1. A sodium butanedisulfonate filter desalination apparatus comprising a storage tank (3) and a desalination membrane group, a feed pump (4) connected to the storage tank (3) and the desalination membrane group, a pure water pipe (2) for feeding pure water and a raw material pipe (1) for feeding sodium butanedisulfonate being installed on the storage tank (3), characterized in that: The desalination membrane group is provided with at least one group, each group of desalination membrane group comprises at least one nanofiltration membrane, provided with emptying mechanism, emptying mechanism comprises emptying pump (15), the inlet of emptying pump (15) is connected with liquid storage tank (3), feed pump (4) and each nanofiltration membrane by emptying pipeline.

2. The sodium butanedioate filter desalination apparatus of claim 1, wherein: The desalination membrane group is provided with multiple groups, each group comprises two nanofiltration membranes: the first nanofiltration membrane (9) and the second nanofiltration membrane (11), the first nanofiltration membrane (9) and the second nanofiltration membrane (11) are connected in series, and the emptying pump (15) is connected to the inlet and outlet of the first nanofiltration membrane (9) and the second nanofiltration membrane (11) by the emptying pipeline.

3. The sodium butanedioate filter desalination apparatus of claim 2, wherein: The desalination membrane group is provided with two groups, each group comprises two nanofiltration membranes: a circulating pump (8) is further provided, the outlet of the feed pump (4) is connected to the inlet of the circulating pump (8), and the outlet of the circulating pump (8) is connected to the inlet of the first nanofiltration membrane (9) in each group of desalination membrane group.

4. The sodium butanedioate filter desalination apparatus of claim 2, wherein: The filtrate outlets of the first nanofiltration membrane (9) and the second nanofiltration membrane (11) in each group of desalination membrane group are connected by pipelines, and the filtrate outlets of the desalination membrane group are formed; the concentrated liquid outlets of the first nanofiltration membrane (9) and the second nanofiltration membrane (11) in each group of desalination membrane group are connected by pipelines, and the retention liquid outlets of the desalination membrane group are formed.

5. The sodium butanedioate filter desalination apparatus of claim 4, wherein: A heat exchanger (7) is further provided, the filtrate outlet of the desalination membrane group is connected to the high-temperature medium inlet of the heat exchanger (7) and the first backflow valve (10) and the second backflow valve (12) simultaneously, the other end of the first backflow valve (10) is backflowed to the liquid storage tank (3), the high-temperature medium outlet of the heat exchanger (7) is connected to the outlet of the feed pump (4) by a pipeline, and the inlet of the emptying pump (15) is connected to the high-temperature medium inlet and the high-temperature medium outlet of the heat exchanger (7) by the emptying pipeline.

6. The sodium butyndisulfonate filter desalination apparatus of claim 1, wherein: An emptying valve (18) in a normally closed state is arranged on each emptying pipeline connected with the emptying pump (15).

7. The sodium butyndisulfonate filter desalination apparatus of claim 3, wherein: The inlet of the feed pump (4) is connected to the bottom outlet of the liquid storage tank (3), the outlet of the feed pump (4) is connected to the inlet of the pre-filter (5) by a pipeline, the outlet of the pre-filter (5) is connected to the inlet of the high-pressure pump (6), and the outlet of the high-pressure pump (6) is connected to the inlet of the circulating pump (8); the inlet of the emptying pump (15) is connected to the inlets and outlets of the feed pump (4), the high-pressure pump (6) and the circulating pump (8) by the emptying pipeline.

8. The sodium butanedioate filter desalination apparatus of claim 7, wherein: A normally closed butterfly valve is further connected between the inlet and the outlet of the pre-filter (5), and the inlet of the emptying pump (15) is connected to the outlet of the pre-filter (5) by the emptying pipeline.

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