CN213434506U

CN213434506U - Ion exchange system for liquid stream treatment

Info

Publication number: CN213434506U
Application number: CN202020327657.XU
Authority: CN
Inventors: 陈小平
Original assignee: Foshan Viomi Electrical Technology Co Ltd
Current assignee: Guangdong Lizi Technology Co Ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2021-06-15
Anticipated expiration: 2030-03-16

Abstract

The utility model discloses an ion exchange system for liquid stream is handled for extract or get rid of ion from pending liquid stream, including the ion exchange unit of at least two series connections, the ion exchange unit includes negative pole, first cation exchange membrane, water dissociation diaphragm, first anion exchange membrane and the positive pole that arranges in proper order, wherein, water dissociation diaphragm includes second cation exchange membrane and second anion exchange membrane; the ion exchange unit further includes a cathode compartment, a cation exchange compartment filled with a cation exchange resin, an anion exchange compartment filled with an anion exchange resin, and an anode compartment.

Description

Ion exchange system for liquid stream treatment

Technical Field

The utility model relates to an ion exchange technology field mainly relates to an ion exchange system that draws or get rid of ion in follow liquid stream.

Background

Ion exchange is one of the methods for extracting or removing ions from a liquid stream using ion exchangers, most commonly ion exchange resins. Currently, ion exchange has been widely used for water purification and softening; desalting seawater and brackish water; refining and decolorizing the solution (such as sugar solution); extracting uranium and rare metals from mineral leaching liquid; extracting antibiotics from fermentation liquor, and recovering noble metals from industrial wastewater.

The ion exchange resin is a high molecular compound with functional groups and a three-dimensional network structure, most of which exist in a granular state, and some of which are made into a fibrous or powdery state and are insoluble in water and common solvents. Ion exchange resins are classified into two major classes, cation exchange resins and anion exchange resins, which can perform ion exchange with cations and anions in a liquid stream, respectively. During ion exchange, cations (e.g. Na) in the liquid stream⁺,Ca²⁺,K⁺,Mg²⁺,Fe³⁺Etc.) with H on a cation exchange resin⁺Exchange is carried out, cations in the liquid stream are transferred to the resin, and H on the resin⁺Is exchanged into water; anions in liquid streams (e.g. Cl)^-，HCO₃ ^-Etc.) with OH on anion exchange resin^-Exchange is carried out, anions in the water are transferred to the resin, and OH on the resin^-Exchange into a liquid stream, and H⁺With OH^-The water is generated in combination, and the purpose of extracting or removing ions from the liquid flow is achieved.

One of the advantages of the ion exchange method is that the ion exchange resin can be recycled after regeneration, and the common regeneration method is an acid-base chemical regeneration method, wherein an acid solution is used for cleaning the cation exchange resin, an alkali solution is used for cleaning the anion exchange resin, and a concurrent or countercurrent mode is adopted. The acid-base chemical regeneration method has many defects, such as low utilization rate of acid-base for regeneration, environmental pollution caused by discharge of waste acid alkali liquor, complex regeneration operation, safety storage and transportation of acid-base as dangerous chemicals, and poor labor conditions. Researchers have proposed methods for electrically regenerating ion exchange resins, but most of the existing methods for electrically regenerating ion exchange resins require that the ion exchange resins be led out from an ion exchange system to a special regeneration system, and have long downtime and complicated operation.

There is still a need to develop a new ion exchange system for liquid stream treatment with an easy resin regeneration function.

SUMMERY OF THE UTILITY MODEL

The utility model discloses in to the ion exchange technical field, to the simple and convenient demand of ion exchange resin regeneration operation, designed a neotype ion exchange system for the liquid stream is handled, can effectively draw or get rid of the ion in the pending liquid stream, and can not use acid-base chemistry medicament to realize the normal position regeneration of ion exchange resin, easy and simple to handle.

The embodiment of the utility model provides an ion exchange system for follow is to be handled and is extracted or get rid of ion in the liquid stream, its characterized in that, the system includes the ion exchange unit of at least two series connection, the ion exchange unit includes: the water dissociation membrane comprises a cathode, a first cation exchange membrane, a water dissociation membrane, a first anion exchange resin and an anode which are sequentially arranged, wherein the water dissociation membrane comprises a second cation exchange membrane and a second anion exchange membrane; a cathode compartment located between the cathode and the first cation exchange membrane comprising two openings; a cation exchange chamber located between the first cation exchange membrane and the second cation exchange membrane, comprising two openings, filled with cation exchange resin; an anion exchange chamber located between the second anion exchange membrane and the first anion exchange membrane, comprising two openings, filled with anion exchange resin; and an anode chamber, located between the first anion exchange membrane and the anode, comprising two openings. Wherein, in each ion exchange unit, one opening of the cation exchange chamber is communicated with one opening of the anion exchange chamber, and one opening of the cathode chamber is communicated with one opening of the anode chamber.

The utility model discloses ion exchange system has two kinds of operating condition of liquid stream processing and resin regeneration: under the condition of liquid flow treatment, adding oneThe liquid flow to be treated flows through the cation exchange chamber and the anion exchange chamber of each ion exchange unit to obtain deionized liquid flow; under the resin regeneration working condition, applying voltage to the cathode and the anode of each ion exchange unit to form a direct current electric field, and generating H through water dissociation at the water dissociation diaphragm⁺With OH^-Said H is⁺Transferring to the cation exchange chamber under the action of DC electric field to regenerate the cation exchange resin, wherein the OH is^-And transferring the solution to the anion exchange chamber under the action of a direct current electric field to regenerate the anion exchange resin, and enabling a stream of solution to be treated to flow through the anode chamber and the cathode chamber of each ion exchange unit to obtain a resin regeneration concentrated solution.

When the ion exchange method is used for treating liquid flow, acid and alkali chemical agents are generally used for regenerating the ion exchange resin, so that the ion exchange resin is unsafe, and the ion exchange resin needs to be led out of a treatment system to a special regeneration system for regeneration, so that the operation is complex. The utility model discloses an ion exchange system can realize ion exchange resin's normal position regeneration, and does not use acid-base chemical agent, is a novel ion exchange system who has the practicality, but wide application in various occasions that need use ion exchange resin to carry out ion exchange.

Drawings

The accompanying drawings and the following detailed description are included to assist in understanding the features and advantages of the present invention, in which:

fig. 1 schematically illustrates a schematic view of a liquid flow treatment regime of an ion exchange unit 100 according to an embodiment of the present invention;

fig. 2 schematically shows a schematic diagram of a resin regeneration operation of the ion exchange unit 100 according to an embodiment of the present invention;

fig. 3 schematically shows a schematic view of the liquid stream treatment conditions of two ion exchange units 100 in series according to an embodiment of the present invention;

fig. 4 schematically shows a schematic diagram of a resin regeneration operation of two ion exchange units 100 connected in series according to an embodiment of the present invention.

Detailed Description

Unless clearly defined otherwise herein, the scientific and technical terms used have the meaning commonly understood by those of skill in the art to which this application pertains. As used in this application, the terms "comprising," "including," "having," or "containing" and similar referents to shall mean that the content of the listed items is within the scope of the listed items or equivalents thereof. The term "or", "or" is not meant to be exclusive, but rather refers to the presence of at least one of the referenced items (e.g., ingredients), and includes the presence of combinations of the referenced items as may be present. Reference throughout this specification to "some embodiments," "some embodiments," and so forth, means that a particular element (e.g., feature, structure, and/or characteristic) described in connection with the invention is included in at least one embodiment described herein, and may or may not be present in other embodiments. In addition, it is to be understood that the described inventive elements may be combined in any suitable manner.

Reference herein to "extracting or removing ions" is to the removal of at least a portion of the ions from a liquid stream to be treated, and it is intended that the extraction be for the purpose of recovering the ions from the liquid stream and the removal be for the purpose of obtaining a purified stream from which the ions have been removed. In some cases, "deionization" or "deionization" is also referred to as "desalination" or "demineralization".

Reference herein to "liquid stream" includes various fluids in the liquid state, for example: an aqueous solution comprising salts in an ionic state, including anions and cations in various valence states, or a liquid comprising a non-aqueous solvent. By way of example, the liquid stream to be treated in the embodiments of the present application includes one or more of tap water, seawater, brackish water, industrial wastewater, sugar liquor, mineral leaching liquor, and fermentation liquor.

The term "water dissociation diaphragm" as used herein means that water can be dissociated to form H in a DC electric field⁺With OH^-The membrane of (3) plays a role in separating the cation exchange chamber from the anion exchange chamber when no electric field is applied. The water-splitting membrane generally comprises a cation exchange membrane and an anion exchange membraneExchange membranes (i.e., the second cation exchange membrane and the second anion exchange membrane). In some embodiments of the present invention, a cation exchange membrane and an anion exchange membrane can be adhered to each other to serve as a water dissociation diaphragm. In other embodiments of the present invention, the water dissociation diaphragm further comprises an intermediate layer between the cation exchange membrane and the anion exchange membrane, the intermediate layer comprises a catalyst, which can reduce the dissociation voltage of water, so that water can be dissociated more easily to generate H⁺With OH^-。

The first stage, the previous stage and the next stage mentioned in the application refer to that in a system with ion exchange units connected in series, each ion exchange unit is a first stage, under the working condition of liquid flow treatment, according to the flowing direction of liquid flow to be treated, the first flowing ion exchange unit is marked as a first stage ion exchange unit, the first flowing ion exchange unit is marked as a previous stage, and the later flowing ion exchange unit is marked as a next stage.

Fig. 1 and 2 show a schematic view of an ion exchange unit 100 according to an embodiment of the present invention. The ion exchange unit 100 includes a cathode 101, a first cation exchange membrane 103, a water dissociation diaphragm, a first anion exchange membrane 104, and an anode 102, which are sequentially arranged, wherein the water dissociation diaphragm includes a second cation exchange membrane 105 and a second anion exchange membrane 106. The ion exchange unit 100 further comprises: a cathode chamber 111, a cation exchange chamber 113, an anion exchange chamber 114 and an anode chamber 112, wherein the cathode chamber 111 is positioned between the cathode 101 and the first cation exchange membrane 103 and comprises two openings; cation exchange chamber 113 is located between first cation exchange membrane 103 and second cation exchange membrane 105, includes two openings, and is filled with cation exchange resin; an anion exchange chamber 114 located between the second anion exchange membrane 106 and the first anion exchange membrane 104, comprising two openings, filled with anion exchange resin; the anode chamber 112 is located between the first anion exchange membrane 104 and the anode 102 and includes two openings. As described above, the cathode chamber 111, the cation exchange chamber 113, the anion exchange chamber 114 and the anode chamber 112 of the ion exchange unit 100 each have two openings, and one or more of these openings may serve as a liquid stream inlet or outlet, and two or more of these openings may communicate with each other, as required by various operating conditions. In some embodiments, an opening of the cation exchange chamber 113 communicates with an opening of the anion exchange chamber 114, as shown in FIG. 1, and the lower opening communicates, and fluid flow can occur as indicated by the arrows. An opening of the cathode 111 communicates with an opening of the anode chamber 112, as shown in fig. 2, and the lower opening, through which the liquid flow can flow as indicated by the arrows.

In some embodiments of the present invention, the cathode 101 may be a metal plate (e.g., iron plate) or a conductive graphite plate, and the anode 102 may be a ruthenium-titanium plate or a graphite plate.

In some embodiments, the cathode 101, the first cation exchange membrane 103, the

water dissociation membranes

105 and 106, the first anion exchange membrane 104, and the anode 102 are generally arranged in parallel in order to make the structure of the ion exchange unit more compact. In addition, the whole ion unit can adopt a plate frame structure and be compacted.

The ion exchange system of certain embodiments of the present invention includes an ion exchange unit 100 having two operating conditions, liquid flow treatment and resin regeneration, as shown in fig. 1 and 2, respectively.

As shown in fig. 1, in the liquid flow treatment condition, the liquid flow to be treated (as shown by the arrow) flows through the cation exchange chamber 113 and the anion exchange chamber 114 of the ion exchange unit 100 in sequence, and is ion exchanged with the cation exchange resin and the anion exchange resin therein, respectively, so as to obtain the deionized liquid flow. In some embodiments, the fluid to be treated may first flow through the anion exchange chamber 114 and then through the cation exchange chamber 113, and the sequence of the fluid flowing through the anion exchange chamber and the cation exchange chamber is not limited in this application and is applicable to all embodiments of this application. Under the liquid flow treatment condition, no voltage is applied to the cathode 101 and the anode 102.

As shown in fig. 2, under the resin regeneration condition, a voltage is applied to the cathode 101 and the anode 102 to form a dc electric field, and water at the water dissociation diaphragm (i.e. the second cation exchange membrane 105 and the second anion exchange membrane 106) is dissociated to generate H⁺With OH^-，H⁺Transferring to the cation exchange chamber 113 under the action of DC electric field to perform cation exchange on the cation exchange resin thereinRegeneration, OH^-The fluid to be treated flows through the anode chamber 112 and the cathode chamber 111 to obtain a concentrated resin regeneration solution (as shown by arrows). In some embodiments, the fluid to be treated may also flow through the cathode chamber 111 first and then through the anode chamber 112, and the order of the fluid flow through the anode chamber and the cathode chamber is not limited in this application and is applicable to all embodiments of the present application. In addition, in certain embodiments, an antiscalant may be added to the fluid stream to be treated during resin regeneration conditions, and the fluid stream to be treated may then be passed through the anode and cathode compartments. When the fluid to be treated containing the scale inhibitor flows through the polar chamber, the content of the insoluble inorganic salt in the polar chamber can be reduced, and the scaling risk of the polar chamber is reduced. The scale inhibitor of the utility model comprises all the agents which can play the functions of indissolvable inorganic salt in dispersion liquid, and can prevent or interfere the precipitation and scaling of the indissolvable inorganic salt on the surface of a base material, for example, various organic, inorganic and polymer scale inhibitors.

The two conditions shown in fig. 1 and 2 are alternated, and the ion exchange unit 100 can be used to treat the liquid stream to be treated for a long time.

The ion exchange system of the embodiment of the utility model also comprises the condition that a plurality of ion exchange units are connected in series. Fig. 3 and 4 schematically show an ion exchange system comprising two ion exchange units 100 in series according to one embodiment of the present invention. As shown in fig. 3 and 4, two ion exchange units 100 with the same structure are connected in series in a manner that: the upper opening of the anion exchange chamber 114 of the first-stage ion exchange unit 100 (left side) is communicated with the upper opening of the cation exchange chamber 113 of the second-stage ion exchange unit 100 (right side), and the upper opening of the anode chamber 112 of the first-stage ion exchange unit 100 (left side) is communicated with the upper opening of the cathode chamber 112 of the second-stage ion exchange unit 100 (right side). The reference to "upper opening" herein is for illustrative purposes only and does not represent an orientation of the physical system.

As shown in fig. 3, for two ion exchange units 100 connected in series, under the liquid flow treatment condition, a flow of liquid to be treated (as shown by arrows) sequentially flows through the cation exchange chamber and the anion exchange chamber of the first stage ion exchange unit 100, and the cation exchange chamber and the anion exchange chamber of the second stage ion exchange unit 100, so as to obtain a deionized liquid flow. As mentioned above, the flow-through sequence of the liquid streams to be treated can be adjusted, and is not limited to the flow-through sequence shown by the arrows in fig. 3.

As shown in fig. 4, for two ion exchange units 100 connected in series, under the resin regeneration condition, a flow of liquid to be treated sequentially flows through the anode chamber and the cathode chamber of the first stage ion exchange unit 100 and the anode chamber and the cathode chamber of the second stage ion exchange unit 100, so as to obtain the resin regeneration concentrated solution. As mentioned above, the flow-through sequence of the liquid streams to be treated can be adjusted, and is not limited to the flow-through sequence shown by the arrows in fig. 4.

The ion exchange system of the embodiment of the present invention may further include three, four or more ion exchange units 100 connected in series, and the connection manner and operation manner of the series connection are substantially the same as those described above with reference to fig. 3 and 4.

The utility model provides an ion exchange system has adopted the mode that cation exchange resin, anion exchange resin filled respectively, can get rid of the zwitterion in the pending fluid effectively, and more importantly is, the utility model discloses an ion exchange system adopts normal position electricity regeneration's method to make ion exchange resin regenerate, need not to use acid-base chemical agent, also need not to derive ion exchange resin, and is easy and simple to handle, is a novel efficient and is used for the ion exchange system that the liquid stream was handled.

The above water treatment method and system are only preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An ion exchange system for treatment of a liquid stream for extraction or removal of ions from a liquid stream to be treated, the system comprising at least two ion exchange units in series, the ion exchange units comprising:

the water dissociation membrane comprises a cathode, a first cation exchange membrane, a water dissociation membrane, a first anion exchange membrane and an anode which are sequentially arranged, wherein the water dissociation membrane comprises a second cation exchange membrane and a second anion exchange membrane;

a cathode compartment located between the cathode and the first cation exchange membrane comprising two openings;

a cation exchange chamber located between the first cation exchange membrane and the second cation exchange membrane and comprising two openings, the cation exchange chamber being a cation exchange chamber filled with cation exchange resin;

an anion exchange chamber located between the second anion exchange membrane and the first anion exchange membrane, comprising two openings, the anion exchange chamber being an anion exchange chamber filled with anion exchange resin; and

an anode chamber located between the first anion exchange membrane and the anode and comprising two openings,

wherein, in each ion exchange unit, one opening of the cation exchange chamber is communicated with one opening of the anion exchange chamber, and one opening of the cathode chamber is communicated with one opening of the anode chamber.

2. The ion exchange system for treatment of a liquid stream of claim 1, wherein the water-splitting membrane comprises the second cation exchange membrane and the second anion exchange membrane in close proximity.

3. The ion exchange system for treatment of a liquid stream of claim 1, wherein the water-splitting membrane further comprises an intermediate layer between the second cation exchange membrane and the second anion exchange membrane, the intermediate layer being a catalyst layer.

4. The ion exchange system for liquid stream treatment according to claim 1, wherein the cathode, first cation exchange membrane, water splitting membrane, first anion exchange membrane and anode are arranged in parallel.