High-boiling residue desalting device

Abstract

The utility model provides a high-boiling-point substance desalting device, which relates to the technical field of polycrystalline silicon and comprises a pre-treatment mechanism, the feeding end of the pre-treatment mechanism is used for feeding high-boiling-point substances, the pre-treatment mechanism removes solids in the high-boiling-point substances in a physical and / or chemical mode, and obtained liquid is discharged from the liquid outlet end of the pre-treatment mechanism; a material inlet of the rectifying tower is connected with the liquid outlet end of the pre-treatment mechanism, and a liquid phase outlet in the top of the rectifying tower is connected with the high-boiling cracking section. Most solids in the high-boiling residues are removed through the pre-treatment mechanism, so that the problem that equipment pipelines are easy to block can be improved; aluminum ions are removed through the rectifying tower, so that the salt content of a high-boiling-point substance is reduced, and damage caused by poisoning and inactivation of resin in a high-boiling-point cracking section is avoided. In addition, the pretreatment mechanism can remove aluminum chloride and other metal impurities in the high-boiling-point substance, so that the salt content of the high-boiling-point substance can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of polysilicon, in particular to a high boiling point desalination device. Background Art

[0002] The high-boiling products produced in the cold hydrogenation section are first enriched in the stirring cooling tank, and then enter the high-boiling cracking section for reaction to mainly recover silicon tetrachloride and hexachlorodisilane. However, the high-boiling products have a high solid content (metal impurities such as aluminum chloride, silicon powder), which can easily lead to blockage of equipment pipelines. In addition, since the high-boiling products contain a high salt content (about 200 ppm, mainly in the form of aluminum chloride), the resin in the high-boiling cracking section will be poisoned, inactivated and damaged. The damaged resin cannot be directly recovered, which increases the processing cost. Utility Model Content

[0003] In view of the above situation, the utility model provides a high boiling point desalination device, aiming to solve the technical problem that the existing high boiling point has a high solid content and is easy to cause blockage of equipment pipelines; in addition, due to the high salt content of the high boiling point, the resin in the high boiling point cracking section will be poisoned, deactivated and damaged, and the damaged resin cannot be directly recovered, which increases the processing cost.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] In a first aspect, the utility model provides a high boiling point desalination device, comprising:

[0006] A pre-treatment mechanism, whose feed end is used to introduce high boiling materials, and the pre-treatment mechanism removes solids in the high boiling materials by physical and / or chemical means, and the obtained liquid is discharged from the liquid outlet end of the pre-treatment mechanism;

[0007] A distillation tower, wherein the material inlet of the distillation tower is connected to the liquid outlet of the pre-treatment mechanism, and the liquid phase outlet at the top of the distillation tower is connected to the high-boiling cracking section.

[0008] In some embodiments of the present invention, the feed end of the pre-treatment mechanism is connected to the stirring cooling tank of the cold hydrogenation section.

[0009] In some embodiments of the present invention, the bottom of the distillation tower is connected to the hydrolysis section.

[0010] In some embodiments of the present invention, the pre-processing mechanism includes a filter.

[0011] In some embodiments of the present invention, the filter has a backflush inlet.

[0012] In some embodiments of the present invention, the pre-processing mechanism includes a first settling tank.

[0013] In some embodiments of the present invention, the filter and the first sedimentation tank are connected in sequence.

[0014] In some embodiments of the present invention, the pre-processing mechanism includes a feed pump, and one or more of a second sedimentation tank, a feed buffer tank, and a pre-pump filter.

[0015] In some embodiments of the present invention, the second settling tank, the feed buffer tank, the pre-pump filter and the feed pump are connected in sequence.

[0016] In some embodiments of the present invention, the high-boiling-substance desalination device further comprises a third settling tank connected to the bottom of the distillation tower.

[0017] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0018] The problem of easy blockage of equipment pipelines can be improved by removing most of the solids (metal impurities such as aluminum chloride and silicon powder) in high-boiling products through the pre-treatment mechanism; the aluminum ions are removed through the distillation tower, reducing the salt content of high-boiling products (mainly in the form of aluminum chloride) to avoid poisoning and inactivation of the resin in the high-boiling cracking section. In addition, since the pre-treatment mechanism can remove metal impurities such as aluminum chloride in high-boiling products, it also helps to reduce the salt content of high-boiling products.

[0019] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of the high boiling point desalination device provided in Example 1;

[0022] Figure 2 This is a schematic diagram of the structure of the high boiling point desalination device provided in Example 2.

[0023] icon:

[0024] 11-filter, 111-backflush inlet, 112-solid phase outlet, 12-first sedimentation tank,

[0025] 2-distillation tower, 21-reboiler, 22-reflux tank,

[0026] 31-second sedimentation tank, 32-feed buffer tank, 33-pre-pump filter, 34-feed pump,

[0027] 4- The third sedimentation tank. DETAILED DESCRIPTION

[0028] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can appreciate, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0029] In the description of the embodiments of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0030] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0031] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0032] See also Figure 1-2 The present application provides a high-boiling-substance desalination device, comprising a pre-treatment mechanism and a distillation tower 2.

[0033] The feed end of the pre-treatment mechanism is used to pass the high-boiling materials stored in the stirring cooling tank of the cold hydrogenation section. The pre-treatment mechanism removes most of the solids (metal impurities such as aluminum chloride, silicon powder) in the high-boiling materials by physical and / or chemical methods, and the obtained liquid is discharged from the liquid outlet end of the pre-treatment mechanism.

[0034] The material inlet in the middle of the distillation tower 2 is connected to the liquid outlet of the pre-treatment mechanism; the liquid phase outlet at the top of the distillation tower 2 is connected to the high-boiling cracking section, which is a prior art. The present application is based on the prior art and adds a high-boiling desalting device; the bottom of the distillation tower 2 is connected to the hydrolysis section, and the structure of the hydrolysis section and the hydrolysis section itself are also prior art, wherein the distillation tower 2 can be a packed tower or a plate tower, and the lower part of the distillation tower 2 is provided with a reboiler 21, and the upper part is provided with a condenser and a reflux tank 22.

[0035] The problem of easy blockage of equipment pipelines can be improved by removing most of the solids (metal impurities such as aluminum chloride and silicon powder) in high-boiling products through the pre-treatment mechanism; the aluminum ions are removed through the distillation tower 2, reducing the salt content of high-boiling products (mainly in the form of aluminum chloride) to avoid poisoning and inactivation of the resin in the high-boiling cracking section. In addition, since the pre-treatment mechanism can remove metal impurities such as aluminum chloride in high-boiling products, it also helps to reduce the salt content of high-boiling products.

[0036] The specific implementation methods of the above ideas will be described below using multiple embodiments.

[0037] Example 1

[0038] See also Figure 1 In this embodiment, the pre-treatment mechanism includes a filter 11 and a first sedimentation tank 12 that are connected to each other; the filter 11 and the first sedimentation tank 12 are both physical treatment methods, the filter 11 plays a role in filtering solids, and the first sedimentation tank 12 plays a role in sedimentation and separation.

[0039] The filter 11 has a material inlet, a liquid phase outlet, a solid phase outlet 112 and a backflush inlet 111. High boiling substances enter the filter 11 from the material inlet, and the separated liquid phase is discharged from the liquid phase outlet, and the solid phase can be discharged from the solid phase outlet 112.

[0040] In this embodiment, preferably, the material is transported pneumatically, for example, an air source is connected to the material inlet of the filter 11 .

[0041] The backflush inlet 111 is used to introduce nitrogen backflush when the filter structure in the filter 11 needs to be cleaned, and the backflushed solids can be discharged from the solid phase outlet 112 to restore the performance of the filter 11. In other embodiments, the filter 11 may not include the backflush inlet 111.

[0042] The first settling tank 12 has a liquid phase outlet, and the liquid phase outlet is used to discharge the supernatant produced by sedimentation separation in the first settling tank 12 .

[0043] By providing the filter 11 and the first settling tank 12, most of the solids in the high boiling materials can be removed.

[0044] It should be noted that, although the present embodiment does not limit the order in which the filter 11 and the first settling tank 12 are connected, it is preferred that the filter 11 and the first settling tank 12 are connected in sequence, with the material inlet of the filter 11 serving as the feed end of the pre-treatment mechanism, and the liquid phase outlet of the first settling tank 12 serving as the liquid outlet of the pre-treatment mechanism. In other embodiments, the filter 11 and the first settling tank 12 may be selected alternatively.

[0045] Example 2

[0046] See also Figure 1-2 In this embodiment, the material is pumped. Specifically, the pre-treatment mechanism includes a second sedimentation tank 31, a feed buffer tank 32, a pre-pump filter 33 and a feed pump 34 connected in sequence; the inlet of the second sedimentation tank 31 serves as the feed end of the pre-treatment mechanism, and the outlet of the feed pump 34 serves as the liquid outlet end of the pre-treatment mechanism.

[0047] Since the solid content of high boiling materials stored in the stirring cooling tank is high, in this embodiment, the second settling tank 31, the feed buffer tank 32 and the pre-pump filter 33 are arranged at the front end of the feed pump 34 to increase the service life of the feed pump 34.

[0048] In other embodiments, the pre-treatment mechanism may include one or more of the second sedimentation tank 31, the feed buffer tank 32 and the pre-pump filter 33, and the connection sequence may be adjusted as needed.

[0049] Example 3

[0050] This embodiment is a further improvement made on the basis of Embodiment 1 or 2.

[0051] See also Figure 1-2 The high-boiling-substance desalting device also includes a third settling tank 4, which is connected between the bottom of the distillation tower 2 and the hydrolysis section to separate the liquid phase and the solid phase of the bottom of the distillation tower 2, wherein the solid phase is removed from the hydrolysis section and the liquid phase can be recycled, which is beneficial to improving the recovery rate of the target substance in the high-boiling-substance.

[0052] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. In the absence of conflicts, the embodiments of the present application and the features in the embodiments may be combined with each other at will. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high boiling point desalination device, characterized in that: include: A pre-treatment mechanism, whose feed end is used to introduce high boiling substances, and the pre-treatment mechanism removes solids in the high boiling substances by physical and / or chemical means, and the obtained liquid is discharged from the liquid outlet end of the pre-treatment mechanism; A distillation tower, wherein the material inlet of the distillation tower is connected to the liquid outlet of the pre-treatment mechanism, and the liquid phase outlet at the top of the distillation tower is connected to the high-boiling cracking section.

2. The high boiling point desalination device according to claim 1, characterized in that: The feed end of the pre-treatment mechanism is connected to the stirring cooling tank of the cold hydrogenation section.

3. The high boiling point desalination device according to claim 1, characterized in that: The bottom of the distillation tower is connected with the hydrolysis section.

4. The high boiling point desalination device according to claim 1, characterized in that: The pre-processing mechanism includes a filter.

5. The high boiling point desalination device according to claim 4, characterized in that: The filter has a backflush inlet.

6. The high boiling point desalination device according to claim 4, characterized in that: The pre-processing mechanism includes a first sedimentation tank.

7. The high boiling point desalination device according to claim 6, characterized in that: The filter and the first sedimentation tank are connected in sequence.

8. The high boiling point desalination device according to claim 1, characterized in that: The pre-treatment mechanism includes a feed pump, and one or more of a second sedimentation tank, a feed buffer tank and a pre-pump filter.

9. The high boiling point desalination device according to claim 8, characterized in that: The second sedimentation tank, the feed buffer tank, the pre-pump filter and the feed pump are connected in sequence.

10. The high boiling point desalination device according to any one of claims 1 to 9, characterized in that: The high-boiling-substance desalination device further comprises a third settling tank connected to the bottom of the distillation tower.

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