CN113769585A - Desalting device and method for high-salt-content glycol solution - Google Patents

Desalting device and method for high-salt-content glycol solution Download PDF

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CN113769585A
CN113769585A CN202111212682.9A CN202111212682A CN113769585A CN 113769585 A CN113769585 A CN 113769585A CN 202111212682 A CN202111212682 A CN 202111212682A CN 113769585 A CN113769585 A CN 113769585A
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chamber
ethylene glycol
electrodialysis
solution
desalting
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王建友
李鹏飞
徐勇
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Zhongling Advanced Nanjing Environmental Technology Research Institute Co ltd
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Zhongling Advanced Nanjing Environmental Technology Research Institute Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/44—Ion-selective electrodialysis
    • B01D61/46—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/422—Electrodialysis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/44—Ion-selective electrodialysis
    • B01D61/46—Apparatus therefor
    • B01D61/48—Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination

Abstract

The invention provides a desalting device and a desalting method for a high-salt-content glycol solution, which serve as a glycol solution recovery system in offshore combustible ice exploitation and aim to physically separate glycol from inorganic salt ions by using an Electrodialysis (ED) technology. The device comprises three operation units, wherein each operation unit comprises a group of electrodialysis membrane stacks, and the single group of electrodialysis membrane stacks are assembled by two compartments of thick compartments and thin compartments in parallel; the compartments are separated by a negative (positive) ion exchange membrane with high cross-linking degree. The process flow is simple and convenient, the operation is convenient, and seawater and the high-salt-content glycol pregnant solution are respectively used as the feeding solutions of the concentrated chamber and the dilute chamber. According to the invention, by adopting the environment-friendly ED technology, the time consumption of ethylene glycol desalination is shortened, a series of problems of high energy consumption, low efficiency, environmental pollution and the like in the traditional thermal desalination process are avoided, the cost is saved, and other pollutants are not generated, so that a subsequent separation and purification process is not required, and the method has great application potential.

Description

Desalting device and method for high-salt-content glycol solution
Technical Field
The invention relates to an ethylene glycol regeneration and recovery system (MRU), in particular to a desalting device and a desalting method for a high-salt-content ethylene glycol solution.
Background
With the development of the energy industry and the environmental problems caused by the combustion of traditional fuels, combustible ice with abundant reserves gradually becomes a hot point of attention, however, the exploitation process of the combustible ice is often accompanied by a high-pressure and low-temperature deep sea environment. Under the extreme environmental condition, gas hydrate formed by wrapping light hydrocarbon molecules such as methane, ethane and propane with water molecules in the mining process can generate crystallization to block a conveying pipeline, so that potential safety hazards are caused, and equipment is shut down. At present, ethylene glycol is often used as a hydrate inhibitor in industry to solve the problem of pipeline blockage caused by crystallization, however, the ethylene glycol is expensive, the preparation process is complicated, and the global yield is short of supply, so the development of an ethylene glycol regeneration and recovery system (MRU) is always a hot research problem.
In the offshore production platform, when ethylene glycol is used as a hydrate inhibitor, dissolved salts in seawater are mixed, so salt ions are accumulated in the MRU continuously, and after long-term operation, scales are formed on the surfaces of a reboiler and a heat exchanger, so that the thermal efficiency is reduced and serious corrosion problems are caused, and therefore, a desalting process must be considered. In recent years, flash evaporation technology is often adopted in MRU systems for desalination, however, the thermal method technology is long in time consumption, high in cold and heat load and capable of causing partial thermal degradation of ethylene glycol, so that development of a novel desalination technology and method is particularly important. In recent years, the role of membrane technology in desalination is not quite remarkable, and in particular, electrodialysis technology is attracting attention due to its flexible operability and excellent desalination performance. In principle, electrodialysis is the first choice for desalting high-salt-content glycol solution as a technology for separating ions from a solution body by using electric field force. However, relevant studies have been reported so far, and certainly, there is also a patent (CN105037095) for recovering ethylene glycol by using a membrane method, wherein the system involves ultrafiltration and two-stage electrodialysis, but the problem of loss rate of ethylene glycol is not considered in relevant design, and the patent only introduces a process flow and has no data support.
Disclosure of Invention
The invention aims to provide a desalting device and a desalting method for an ethylene glycol solution, which have high recovery rate, low energy consumption and no pollution to the environment.
In order to solve the technical problems, the invention adopts the technical scheme that: a high-salt-content glycol solution desalting device comprises three groups of electrodialysis devices connected in series, each electrodialysis device comprises a cathode plate, an anode plate and a plurality of repeating units, an anode chamber is arranged between each anode plate and each repeating unit, a cathode chamber is arranged between each cathode plate and each repeating unit, and each repeating unit comprises two compartments which are respectively: the ion exchange membrane is arranged between adjacent compartments.
Further, the feed end pipeline of electrodialysis device is connected with the discharge end of raw materials liquid holding vessel and sea water holding vessel by the diaphragm booster pump respectively, the discharge end pipe connection of diaphragm booster pump has a rotameter, the high salt content ethylene glycol solution electrodialysis desalination device main part comprises 3 electrodialysis devices by the pipeline series connection respectively, the advance of electrodialysis device, discharge end are equipped with the conductivity meter, the electrodialysis device is furnished with independent power supply, the negative pole of negative plate fixedly connected with power, the anode plate with the anodal fixed connection of power, anode chamber and cathode chamber and circulation utmost point water tank are by the pipe connection.
Furthermore, the anode plate and the cathode plate are both titanium ruthenium-coated flat plate electrodes
The desalting method of the glycol solution with high salt content comprises the following steps:
the method comprises the following steps: introducing pretreated ethylene glycol rich solution into a desalting chamber, introducing pretreated seawater into a concentrating chamber, and introducing sodium sulfate solution into a cathode chamber and an anode chamber; wherein, the desalination chamber and the concentration chamber adopt a once-through water supply mode, and the cathode chamber and the anode chamber adopt a circulating water supply mode.
Step two: sequentially electrifying the anode plate (1) and the cathode plate (2) of each stage of electrodialysis devices (15-1, 15-2, 15-3) according to the flowing condition of the feed liquid to form a direct current electric field so as to desalt cations (Na) in the ethylene glycol rich liquid in the room+、K+、Ca2+、Mg2+) And anions (Cl)-And SO4 2-) Respectively penetrate through the cation exchange membrane and the anion exchange membrane to enter the concentration chamberAnd obtaining a desalted solution through ion selective separation, wherein glycol molecules in the glycol rich solution in the desalting chamber flow out along with the feed liquid due to no electric charge, and finally obtaining a glycol barren solution in a product box.
Step three: and (4) timely replenishing the feed liquid and the seawater in the feed liquid storage tank and the seawater storage tank to continuously carry out the desalting process until enough glycol barren solution is obtained.
Further, in the first step, the concentration of the ethylene glycol in the ethylene glycol rich solution is less than or equal to 80 percent
Further, in the second step, the ion exchange membrane includes a cation exchange membrane and an anion exchange membrane, and both the cation exchange membrane and the anion exchange membrane are composite ion exchange membranes with high crosslinking degree characteristics.
Furthermore, in the third step, the method for supplementing the feed liquid and the seawater can be selectively provided with a feed liquid storage tank and a seawater storage tank, the ethylene glycol rich liquid can directly come from an upstream process, and the seawater can be directly extracted from the sea.
Further, the water flow line speed in the desalting chamber, the concentrating chamber, the cathode chamber and the anode chamber is 0.1-0.3 cm/s; the current density is 3-15 mA/cm2
The principle of the invention is that cations (Na) in the ethylene glycol rich solution in the desalting chamber of the first-stage electrodialysis device are generated due to the directional migration of ions in each compartment under the action of an electric field and the selective permeability of an ion exchange membrane+、K+、Ca2+、Mg2 +) And anions (Cl)-And SO4 2-) Respectively penetrate through the cation exchange membrane and the anion exchange membrane to enter the seawater in the concentration chamber. Meanwhile, the ethylene glycol molecules are not electrified, so that the ethylene glycol molecules are not influenced by an electric field and flow out along with the solution. Similarly, the glycol solution desalted by the previous stage electrodialysis is further desalted in the next stage electrodialysis until the required desalting rate is reached
Compared with the prior art, the invention has the advantages and positive effects that:
1. the multistage series electrodialysis desalination device provided by the invention can realize one-pass continuous desalination of the high-salt-content glycol solution through the targeted design of the process, and accelerates the process. In addition, the volume of a single electrodialysis membrane stack is small, and the whole desalting device can be flexibly arranged according to space requirements. After the multistage series electrodialysis desalination device provided by the invention is applied, the desalination energy consumption of an MRU process system can be obviously reduced, and the operation stability of a platform is improved.
2. The method can remove inorganic salt ions from the glycol solution with high salt content, can obtain the recyclable glycol barren solution without thermal processes such as rectification and the like, has no phase change in the whole process, and avoids the heat loss of glycol. The whole desalting device can timely adjust the number of electrodialysis membrane stacks by valves according to the to-be-treated amount of the ethylene glycol rich solution, and can adjust the salt content in the final ethylene glycol barren solution as required by adjusting the operating voltage and flow. In addition, the by-product of the process is concentrated salt solution, salt ions can be classified and recycled by utilizing other process technologies such as an electric membrane reactor and the like, and the environmental protection and the economical efficiency of the ethylene glycol desalting process are greatly improved.
Drawings
FIG. 1 is a block diagram of a process flow of the present invention;
FIG. 2 is a schematic diagram of the operation of electrodialysis in accordance with the invention;
FIG. 3 is a system block diagram of the present invention;
in the figure: the device comprises an anode plate-1, a cathode plate-2, a concentration chamber-3, a desalination chamber-4, an anode chamber-5, a cathode chamber-6, a cation exchange membrane-7, an anion exchange membrane-8, a feed liquid storage tank-9, a seawater storage tank-10, an electrode water tank-11, a diaphragm booster pump-12, a flow meter-13, a conductivity meter-14, a primary electrodialysis membrane stack-15-1, a secondary electrodialysis membrane stack-15-2, a tertiary electrodialysis membrane stack-15-3, a product tank-16 and a power supply-17.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description and accompanying drawings that illustrate the invention.
Example 1:
as shown in fig. 1-3, the method for desalting the rich ethylene glycol solution comprises the following steps:
the method comprises the following steps: the electrodialysis membrane stack (15-1-15-3) is designed to comprise 100 repeating units. Sequentially introducing seawater with the salt content of 3.5% into the concentration chambers (3) of the electrodialysis membrane stacks (15-1-15-3); an ethylene glycol rich solution is introduced into the desalting chamber (4), wherein the salt content in the ethylene glycol rich solution is 2.5%, and the concentration of ethylene glycol is 40%; 3% sodium sulfate solution is introduced into the anode chamber (5) and the cathode chamber (6). Wherein the flow rates of the seawater and the ethylene glycol rich solution are 100L/h, and the flow rate of the sodium sulfate solution is 80L/h.
Step two: electrifying the anode plate (1) and the cathode plate (2) of the three-stage electrodialysis membrane stack (15-1-15-3) to form a direct current electric field, connecting the anode plate (1) with the positive pole of the power supply (17), connecting the cathode plate (2) with the negative pole of the power supply (17), operating in a constant voltage mode, wherein the operating voltage is 60V, inorganic salt ions in the ethylene glycol pregnant solution penetrate through anion and cation exchange membranes respectively under the action of the electric field to enter the concentration chamber (3), and ethylene glycol molecules are uncharged, so that the ethylene glycol barren solution is not influenced by the electric field and flows out along with the solution, thereby obtaining the desalted ethylene glycol barren solution.
Step three: the water outlet end of the desalting chamber (4) of the three-stage electrodialysis membrane stack (15-3) is provided with product liquid, equipment can continuously run for a long time, when the required glycol lean solution amount is collected in the product tank (16), the reaction is terminated, the power supply (17) is sequentially cut off, the final solution desalination rate can reach 56.32%, the glycol lean solution TDS is 11.38g/L, the water outlet end solution TDS of the concentrating chamber (3) of the three-stage electrodialysis membrane stack (15-3) is 46.27g/L, the glycol recovery rate is 99.71%, and the energy consumption for treating one ton of glycol rich solution is 4.27 kWh.
Example 2:
as shown in fig. 1-3, the method for desalting the rich ethylene glycol solution comprises the following steps:
the procedure was as in example 1;
step two: electrifying the anode plate (1) and the cathode plate (2) of the three-stage electrodialysis membrane stack (15-1-15-3) to form a direct current electric field, connecting the anode plate (1) with the positive pole of the power supply (17), connecting the cathode plate (2) with the negative pole of the power supply (17), operating in a constant voltage mode, wherein the operating voltage is 130V, inorganic salt ions in the ethylene glycol pregnant solution penetrate through anion and cation exchange membranes respectively under the action of the electric field to enter the concentration chamber (3), and ethylene glycol molecules are uncharged, so that the ethylene glycol barren solution is not influenced by the electric field and flows out along with the solution, thereby obtaining the desalted ethylene glycol barren solution.
Step three: the water outlet end of the desalting chamber (4) of the three-stage electrodialysis membrane stack (15-3) is provided with product liquid, equipment can continuously run for a long time, when the required glycol lean solution amount is collected in the product tank (16), the reaction is terminated, the power supply (17) is sequentially cut off, the final solution desalination rate can reach 90.23%, the glycol lean solution TDS is 2.55g/L, the TDS of the solution at the water outlet end of the concentrating chamber (3) of the three-stage electrodialysis membrane stack (15-3) is 53.87g/L, the glycol recovery rate is 98.12%, and the energy consumption for treating one ton of glycol rich solution is 16.19 kWh.
The operating voltage is increased, the electric field intensity is increased, and the ion migration speed is increased, so that the salt rejection rate is increased, and the energy consumption is improved. In addition, since the ion migration speed is high, part of glycol molecules will migrate along with the ion migration speed, and the glycol recovery rate is reduced.
Example 3:
as shown in fig. 1-3, the method for desalting the rich ethylene glycol solution comprises the following steps:
the method comprises the following steps: the electrodialysis membrane stack (15-1-15-3) is designed to comprise 100 repeating units. Sequentially introducing seawater with the salt content of 3.5% into the concentration chambers (3) of the electrodialysis membrane stacks (15-1-15-3); an ethylene glycol rich solution is introduced into the desalting chamber (4), wherein the salt content in the ethylene glycol rich solution is 2.5%, and the concentration of ethylene glycol is 40%; 3% sodium sulfate solution is introduced into the anode chamber (5) and the cathode chamber (6). Wherein the flow rates of the seawater and the ethylene glycol rich solution are 80L/h, and the flow rate of the sodium sulfate solution is 80L/h.
The second step is the same as the example 1;
step three: the water outlet end of the desalting chamber (4) of the three-stage electrodialysis membrane stack (15-3) is provided with product liquid, equipment can continuously run for a long time, when the required glycol lean solution amount is collected in the product tank (16), the reaction is terminated, the power supply (17) is sequentially cut off, the final solution desalination rate can reach 66.73%, the glycol lean solution TDS is 8.67g/L, the water outlet end solution TDS of the concentrating chamber (3) of the three-stage electrodialysis membrane stack (15-3) is 49.00g/L, the glycol recovery rate is 98.29%, and the energy consumption for treating one ton of glycol rich solution is 4.88 kWh.
This is because the flow rate is reduced, the residence time of the solution in the electric field is prolonged, and the longer the residence time is, the more the ion migration amount is, under the same operating voltage condition, so the salt rejection rate is increased, the recovery rate of ethylene glycol is reduced, and the energy consumption is increased.
Example 4:
as shown in fig. 1-3, the method for desalting the rich ethylene glycol solution comprises the following steps:
the method comprises the following steps: the electrodialysis membrane stack (15-1-15-3) is designed to comprise 100 repeating units. Sequentially introducing seawater with the salt content of 3.5% into the concentration chambers (3) of the electrodialysis membrane stacks (15-1-15-3); an ethylene glycol rich solution is introduced into the desalting chamber (4), wherein the salt content in the ethylene glycol rich solution is 2.5%, and the concentration of ethylene glycol is 60%; 3% sodium sulfate solution is introduced into the anode chamber (5) and the cathode chamber (6). Wherein the flow rates of the seawater and the ethylene glycol rich solution are 100L/h, and the flow rate of the sodium sulfate solution is 80L/h.
Step two: electrifying the anode plate (1) and the cathode plate (2) of the three-stage electrodialysis membrane stack (15-1-15-3) to form a direct current electric field, connecting the anode plate (1) with the positive pole of the power supply (17), connecting the cathode plate (2) with the negative pole of the power supply (17), operating in a constant voltage mode, wherein the operating voltage is 120V, inorganic salt ions in the ethylene glycol pregnant solution penetrate through anion and cation exchange membranes respectively under the action of the electric field to enter the concentration chamber (3), and ethylene glycol molecules are uncharged, so that the ethylene glycol barren solution is not influenced by the electric field and flows out along with the solution, thereby obtaining the desalted ethylene glycol barren solution.
Step three: the water outlet end of the desalting chamber (4) of the three-stage electrodialysis membrane stack (15-3) is provided with product liquid, equipment can continuously run for a long time, when the required glycol lean solution amount is collected in the product tank (16), the reaction is terminated, the power supply (17) is sequentially cut off, the final solution desalination rate can reach 58.33%, the glycol lean solution TDS is 11.11g/L, the water outlet end solution TDS of the concentrating chamber (3) of the three-stage electrodialysis membrane stack (15-3) is 43.42g/L, the glycol recovery rate is 99.43%, and the energy consumption for treating one ton of glycol rich solution is 8.7 kWh.
This is because the concentration of ethylene glycol in the ethylene glycol rich solution is increased, which increases the solution resistance and the ion transfer resistance, so that the salt rejection rate similar to that of example 1 is achieved under the condition of higher operating voltage, and the energy consumption is increased.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.

Claims (9)

1. The utility model provides a high salt content ethylene glycol solution electrodialysis desalination device which characterized in that: including one-level electrodialysis device (15-1), second-order electrodialysis device (15-2), tertiary electrodialysis device (15-3), electrodialysis device (15-1, 15-2, 15-3) include negative plate (2), anode plate (1) and a plurality of repetitive unit, anode plate (1) with be equipped with anode chamber (5) between the repetitive unit, negative plate (2) with be equipped with cathode chamber (6) between the repetitive unit, every the repetitive unit all contains two compartments, is respectively: the desalination chamber (4), the concentration chamber (3), be equipped with ion exchange membrane between the adjacent compartment.
2. The electrodialysis desalination device for the high-salt-content glycol solution according to claim 1, characterized in that: the feed end pipeline of the electrodialysis device (15-1, 15-2, 15-3) is respectively connected with the discharge ends of a raw material liquid storage tank (9) and a seawater storage tank (10) through a diaphragm booster pump (12), the discharge end pipeline of the diaphragm booster pump (12) is connected with a rotor flow meter (13), the main body of the high-salt-content ethylene glycol solution electrodialysis desalination device is respectively formed by connecting 3 electrodialysis devices (15-1, 15-2, 15-3) in series through pipelines, the feed and discharge liquid ends of the electrodialysis devices (15-1, 15-2, 15-3) are provided with conductivity meters (14), the electrodialysis devices (15-1, 15-2, 15-3) are provided with an independent power supply (17), the cathode plate (2) is fixedly connected with the cathode of the power supply (17), and the anode plate (1) is fixedly connected with the anode of the power supply (17), the anode chamber (5) and the cathode chamber (6) are connected with the circulating polar water tank (11) through pipelines.
3. The electrodialysis desalination device for the high-salt-content glycol solution according to claim 1, characterized in that: the anode plate (1) and the cathode plate (2) are both titanium ruthenium-coated flat plate electrodes.
4. The electrodialysis desalination device for the high-salt-content glycol solution according to claim 1, characterized in that: the number of the electrodialysis devices (15-1, 15-2, 15-3) connected in series is not limited to 3, and can be increased or decreased according to specific treatment requirements.
5. A method for desalination of an ethylene glycol solution by means of a device as provided in any of claims 1-3, characterized in that: the method comprises the following steps:
the method comprises the following steps: the method comprises the steps of adding a pretreated ethylene glycol rich solution into a desalting chamber (4), adding pretreated seawater into a concentrating chamber (3), and adding a sodium sulfate solution into an anode chamber (5) and a cathode chamber (6), wherein the desalting chamber (4) and the concentrating chamber (3) both adopt a once-through water supply mode, and the anode chamber (5) and the cathode chamber (6) adopt a circulating water supply mode.
Step two: sequentially electrifying the anode plate (1) and the cathode plate (2) of each stage of electrodialysis devices (15-1, 15-2, 15-3) according to the flowing condition of the feed liquid to form a direct current electric field, and desalting positive ions (Na) in ethylene glycol rich solution in the chamber (4)+、K+、Ca2+、Mg2+) And anions (Cl)-And SO4 2-) The ethylene glycol enters the concentration chamber (3) through cation and anion exchange membranes respectively, and is subjected to ion selective separation to obtain a desalted solution, and ethylene glycol molecules in the ethylene glycol rich solution in the desalting chamber (4) flow out along with the feed liquid due to no charge, so that an ethylene glycol lean solution is finally obtained in a product box (16).
Step three: the feed liquid and the seawater are supplemented in the feed liquid storage tank (9) and the seawater storage tank (10) at proper time, and the desalting process is continuously carried out until enough glycol barren solution is obtained.
6. The method for desalting the high-salinity ethylene glycol solution according to the claim 5, is characterized in that: in the first step, the concentration of ethylene glycol in the ethylene glycol rich solution is less than or equal to 80 percent.
7. The method for desalting the high-salinity ethylene glycol solution according to the claim 5, is characterized in that: in the second step, the ion exchange membrane comprises a cation exchange membrane (7) and an anion exchange membrane (8), and the cation exchange membrane (7) and the anion exchange membrane (8) are both composite ion exchange membranes with high crosslinking degree characteristics.
8. The method for desalting the high-salinity ethylene glycol solution according to the claim 5, is characterized in that: in the third step, the method for supplementing the feed liquid and the seawater can be selectively provided with a feed liquid storage tank (9) and a seawater storage tank (10), the ethylene glycol rich liquid can directly come from an upstream process, and the seawater can be directly extracted from the sea.
9. The method for desalting the high-salinity ethylene glycol solution according to claim 5, characterized in that: the desalting chamber (4), the concentrating chamber (3), the anode chamber (5) and the cathode chamber (6) have water flow line speed of 0.1-0.3 cm/s; the current density is 3-15 mA/cm2。
CN202111212682.9A 2021-10-18 2021-10-18 Desalting device and method for high-salt-content glycol solution Pending CN113769585A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114789000A (en) * 2022-05-25 2022-07-26 南开大学 Modified cation exchange membrane for electrodialysis desalination of high-salt-content glycol solution, modification method, electrodialysis device and desalination method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114789000A (en) * 2022-05-25 2022-07-26 南开大学 Modified cation exchange membrane for electrodialysis desalination of high-salt-content glycol solution, modification method, electrodialysis device and desalination method
CN114789000B (en) * 2022-05-25 2024-01-30 南开大学 Modified cation exchange membrane for electrodialysis desalination of high-salt ethylene glycol solution, modification method, electrodialysis device and desalination method

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