RU160773U1 - Installation for integrated production of chlorine-containing reagents and sodium ferrate - Google Patents

Installation for integrated production of chlorine-containing reagents and sodium ferrate Download PDF

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RU160773U1
RU160773U1 RU2015138325/05U RU2015138325U RU160773U1 RU 160773 U1 RU160773 U1 RU 160773U1 RU 2015138325/05 U RU2015138325/05 U RU 2015138325/05U RU 2015138325 U RU2015138325 U RU 2015138325U RU 160773 U1 RU160773 U1 RU 160773U1
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ferrate
cathode
electrolysis
reagents
anode
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RU2015138325/05U
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Russian (ru)
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Андрей Николаевич Волков
Владимир Евгеньевич Брунман
Александр Викторович Коняшин
Михаил Владимирович Брунман
Ани Петрова Петкова
Владимир Алексеевич Дьяченко
Евгений Николаевич Аракчеев
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федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский политехнический университет Петра Великого" (ФГАОУ ВО "СПбПУ")
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Abstract

1. Installation for the complex production of chlorine-containing reagents and sodium ferrate, including electrolysis units connected to a current source, designed to produce chlorine-containing reagents and sodium ferrate, respectively, while the electrolysis unit for producing chlorine-containing reagents is equipped with an ion-exchange membrane that separates the space into the cathode and anode chambers the last of which is communicated with the capacity for preparing the saline solution, and the cathodic one - with the capacity containing water, and is associated with ferrate electrolysis m block, characterized in that an ion-exchange membrane is inserted between the cathode and the iron-containing anode in the ferrate electrolysis block, and the cathode and anode chambers of the ferrate electrolysis block are connected to hydrogen and oxygen separators, respectively. 2. Installation according to claim 1, characterized in that the cathodic and anodic chambers of the ferrate electrolysis unit are connected through an intermediate tank for accumulating alkali to the cathode chamber of the electrolyzer to produce chlorine-containing reagents, and the anode chamber of the ferrate electrolysis block is connected through an intermediate tank for accumulating sodium ferrate with the pipeline processed water

Description

The utility model relates to the field of chemical production, in particular to equipment intended for the integrated production of chlorine-containing reagents and sodium ferrate, used for the disinfection of drinking water and the purification (by coagulation) of industrial, agricultural and other effluents.
From the point of view of the oxidizing potential of various reagents used in practice, the most effective are chlorine, chlorine dioxide, ozone, hydrogen peroxide, permanganate and ferrate (VI). However, despite the high potential of all these reagents, from the standpoint of economic profitability, the development of technology and the breadth of practical application, chlorine-containing reagents are in the first place. At the same time, the last 10-15 years, special attention of researchers and practitioners has been attracted by sodium (VI) ferrate, which has the highest oxidation potential that exceeds even ozone, the bactericidal effect of which, by the way, is very short.
Ferrates (VI) of alkali metals have a multifunctional effect, are the most powerful of the known oxidizing agents and are able to decompose many toxic chemicals into low toxic products (oxidizing effect), as well as cause the death of microorganisms (disinfecting effect). The decomposition product of the ferrates themselves in solution is iron hydroxide, that is, a low-toxic product. In addition, iron hydroxide is released in the form of colloidal aggregates with a very developed surface, which effectively adsorb heavy metal ions, radionuclides, suspension particles and organic residues, providing additional water purification by coagulation of pollutants (coagulating effect). To date, various technologies have been developed for their production and use. The production of dry stabilized ferrate requires high costs for its synthesis, transportation and packaging. In the production of ferrate at the place of use, the liquid product has more stable properties, it is easily pumped and added to any solution or production system, its cost is reduced by 4 times. The use of alkali metal ferrates provides a disinfecting, oxidizing and coagulating effect, but does not produce a prolonged effect.
Hardware design of technologies for producing solutions of both chlorine-containing reagents and ferrate is reduced to the use of electrolysis plants.
An example of an electrolytic ferrate production plant is described in CN 102925919. This device includes a cathode chamber, an anode chamber, a solution mixing device, a multi-cell housing, a valve, a plate cathode, a plate anode, and a cation exchange membrane. For the electrochemical production of a ferrate solution in continuous mode using a metering device in the form of a three-dimensional electrode, two anode chambers are used, between which there is a cathode chamber of a smaller volume than the anode chamber. An agitator is installed at the bottom in the anode chamber, two cathode iron plates are installed in the cathode chamber, spaced along the sides of the cathode chamber along cation exchange membranes separating the cathode and anode chambers; the anode plate is a plurality of spaced apart plates of foamed iron with a thickness of 0.5-1 mm.
The disadvantages of the described installation are:
- the need to use concentrated alkali as a working solution, supplied in the form of a solution or in granules, which requires additional costs for its storage and compliance with the requirements governing the storage of concentrated alkali;
- when using only ferrate for disinfecting drinking water and coagulating the impurities contained in it, the requirements of SanPiN 2.1.4.1074-01 and GOST 2874-82 on the mandatory content of residual chlorine in it within 0.3-0.5 mg / l are not met prolonged disinfection requirements.
A recent promising trend is the combination of the production of the most effective oxidizing agents and their joint use, presented in the form of a technical solution selected as a prototype, which is a plant for the production of chlorine-containing reagents and sodium ferrate, intended for disinfection (sterilization) of ballast water [KR 101202765]. It includes electrolysis units for the production of hypochlorite (electrodialyzer) and ferrate (electrolyzer), a sterilizer with hypochlorite and a sterilizer with ferrate, a sodium chloride tank, a water tank, as well as a pump and pipe system for supplying various reagents to the electrodialyzer. The electrodialyzer consists of a bath, an anode plate separated by an ion-exchange membrane from the cathode plate, and feed tubes. The electrodialyzer produces hypochlorite (NaClO) and caustic soda (NaOH). The electrolyzer for producing ferrate consists of a bath, a cathode plate, an iron-containing anode and feed pipes. From the electrodialyzer, alkali is piped and water from the tank is supplied to the electrolysis bath for electrolytic decomposition of iron to produce ferrate.
The disadvantages of the prototype include the following:
- high costs and lower current efficiency in the production of ferrate in an undivided cell, associated with a decrease in the concentration of ferrate in solution due to the electrochemical reduction of the ferrate ion at the cathode after the ferrate overcomes the distance from the anode to the cathode, and also because of the chemical reduction of ferrate an ion of molecular hydrogen formed at the cathode;
- the formation of explosive mixtures of released hydrogen and oxygen in the production of ferrate in an undivided cell.
Thus, the objective of the utility model is to improve the quality of oxidizing reagents, as well as increasing productivity in their production. Another objective of the utility model is to increase the safety of the installation as a whole.
The problem is achieved due to the fact that the installation for the complex production of chlorine-containing reagents and sodium ferrate includes electrolysis units connected to the current source, designed to produce chlorine-containing reagents and sodium ferrate, respectively, while the electrolysis unit for producing chlorine-containing reagents is equipped with an ion-exchange membrane that divides the space into cathodic and anodic chambers, the last of which is associated with the capacity for preparing the saline solution, and the cathodic chamber is associated with the capacity, containing water, and through an intermediate tank for accumulating alkali, it is connected to the cathode and anode chambers of the ferrate electrolysis block, in which an ion-exchange membrane is introduced between the cathode and the iron-containing anode, and the cathode and anode chambers of the ferrate electrolysis block are connected to hydrogen and oxygen separators, respectively, and the anode chamber ferrate electrolysis unit is connected through an intermediate tank for the accumulation of sodium ferrate with the pipeline of treated waters.
The technical result of the utility model consists in the fact that the introduction of an ion-exchange membrane in the ferrate electrolysis unit made it possible to increase the current output of the ferrate and reduce the explosion hazard of the installation, and the introduction of oxygen and hydrogen separators into it made it possible to increase the safety of its operation in general.
The figure attached to the description of the utility model shows a schematic representation of the proposed integrated plant for the production of chlorine-containing reagents and sodium ferrate.
The complex for the complex production of chlorine-containing reagents and sodium ferrate contains two modules: M1 and M2.
The module M1 for producing chlorine-containing reagents consists of a direct current source 1, a tank 2 for preparing saline solution, an electrolysis unit 3, the cavity of which is separated by an ion-exchange membrane 4 into anode and cathode chambers equipped with two electrodes - anode 5 and cathode 6, respectively. Module M1 is equipped with dosing devices for saline and water (7) into the anode and cathode chambers of the electrolysis unit 3, respectively, with capacities 8 and 2, containing water for supply to the cathode chamber and saline for supply to the anode chamber. The anode chamber is connected to the OB pipeline transporting the treated water, the cathode chamber is connected to the electrolysis unit to obtain sodium ferrate through an intermediate tank 9 for accumulating alkali.
The M2 module for producing sodium ferrate includes a direct current source 10, an electrolysis unit 11, the anode and cathode chambers of which are connected to an intermediate tank 9 for alkali accumulation and contain two electrodes - anode 12 and cathode 13 separated by an ion-exchange membrane 14. In this case, the anode should be iron-containing and serve as a source of iron for the production of ferrate. The cathode chamber of the electrolysis unit 11 is connected to the outer space through a hydrogen separator 16, the anode chamber through an oxygen separator 17, and also with a ferrate storage capacity 15. It should be noted that the system of various sensors, display systems and control panels is not shown in the figure.
The operation of the installation is shown by sequentially describing the operation of each of the modules M1 and M2 separately.
Module M1. Cold water from the city water supply network enters containers 2 and 8. Salt is pre-poured into the container 2 through an open cover to the maximum mark. From the tank 2, saturated saline solution is supplied to the anode chamber of the electrolysis cell 3. Cold water from the tank 8 enters the cathode chamber of this electrolyzer. In the latter from the anode chamber, Na + ions pass through the ion exchange membrane 4 into the cathode chamber, where an alkali solution of NaOH is produced. From the anode chamber of the electrolyzer 3, hypochlorite is fed into the OB pipeline. From the electrolyzer 3, the catholyte is fed into the intermediate tank 9 of the M2 module for the production of ferrate.
Module M2. From an intermediate tank 9, an alkaline NaOH solution with a concentration of 20-35% is supplied to the lower part of the cathode and anode chambers of the electrolyzer 11. In the electrolyzer 11, at a temperature of 30-55 degrees from the anode chamber, Na + ions pass through the ion exchange membrane into the cathode chamber, where it slightly increases alkali concentration. In the anode chamber under the influence of electric current, the iron-containing anode 12 is destroyed and sodium ferrate (Na 2 FeO 4 ) is formed. For the reaction to take place, a direct current of up to 40-60 A is supplied to the electrodes of the electrolysis cell 11 at a voltage of up to 2.5-6 V. Hydrogen gas from the electrolyzer through the separator 16 and oxygen gas through the separator 17 is discharged into the outer space surrounding the building. The produced solution of sodium ferrate from the oxygen separator 17 enters the intermediate tank 15 and from there into the OB water treatment system.
The introduction of a membrane between the cathode and the anode increases the current efficiency and reduces the energy consumption of the process, which is associated with the elimination of two effects: electrochemical reduction of the ferrate ion at the cathode and chemical reduction of the ferrate ion with molecular hydrogen obtained at the cathode. Another advantage of introducing the membrane into the electrolysis unit to obtain ferrate is the isolation of hydrogen gas removed from the cathode space from oxygen gas produced in the anode space of the electrolyzer. Due to the separation of the cathode and the anode chamber, the danger of the formation of explosive mixtures of hydrogen and residual oxygen is minimized and the inert gas purge that is needed in an undivided cell is eliminated.
The production of liquid ferrates and their application at the place of use provides resource saving, since it does not require expensive stabilization, packaging and transportation operations used to obtain dry ferrates. According to foreign estimates, the production technology of ferrates for disinfecting wastewater is the cheapest compared to the production of hypochlorite, UV and ozone treatment both in terms of capital costs, and in terms of operation and maintenance.

Claims (2)

1. Installation for the complex production of chlorine-containing reagents and sodium ferrate, including electrolysis units connected to a current source, designed to produce chlorine-containing reagents and sodium ferrate, respectively, while the electrolysis unit for producing chlorine-containing reagents is equipped with an ion-exchange membrane that separates the space into the cathode and anode chambers the last of which is communicated with the capacity for preparing the saline solution, and the cathodic one - with the capacity containing water, and is associated with ferrate electrolysis m block, characterized in that an ion-exchange membrane is introduced between the cathode and the iron-containing anode in the ferrate electrolysis block, and the cathode and anode chambers of the ferrate electrolysis block are connected to hydrogen and oxygen separators, respectively.
2. Installation according to claim 1, characterized in that the cathode and anode chambers of the ferrate electrolysis unit are connected through an intermediate tank for accumulating alkali to the cathode chamber of the electrolyzer to produce chlorine-containing reagents, and the anode chamber of the ferrate electrolysis block is connected through an intermediate tank for accumulating sodium ferrate with treated water pipeline.
Figure 00000001
RU2015138325/05U 2015-09-08 2015-09-08 Installation for integrated production of chlorine-containing reagents and sodium ferrate RU160773U1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU169435U1 (en) * 2016-07-04 2017-03-17 федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский политехнический университет Петра Великого" (ФГАОУ ВО "СПбПУ") Installation for the complex production of chlorine-containing reagents and sodium ferrate
RU2631428C1 (en) * 2016-12-19 2017-09-22 Общество с ограниченной ответственностью "Аква-Раут" Method for electrochemical synthesis of alkali metal ferrates
RU196524U1 (en) * 2019-10-03 2020-03-03 Общество с ограниченной ответственностью «Экотех» DEVICE FOR PRODUCING ALKALINE SOLUTION FERRAT (VI) SODIUM

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU169435U1 (en) * 2016-07-04 2017-03-17 федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский политехнический университет Петра Великого" (ФГАОУ ВО "СПбПУ") Installation for the complex production of chlorine-containing reagents and sodium ferrate
RU2631428C1 (en) * 2016-12-19 2017-09-22 Общество с ограниченной ответственностью "Аква-Раут" Method for electrochemical synthesis of alkali metal ferrates
RU196524U1 (en) * 2019-10-03 2020-03-03 Общество с ограниченной ответственностью «Экотех» DEVICE FOR PRODUCING ALKALINE SOLUTION FERRAT (VI) SODIUM

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