CN1302920A - Electrolysis process for sodium sulfate or sodium hydrogen sulfate - Google Patents
Electrolysis process for sodium sulfate or sodium hydrogen sulfate Download PDFInfo
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- CN1302920A CN1302920A CN 00130851 CN00130851A CN1302920A CN 1302920 A CN1302920 A CN 1302920A CN 00130851 CN00130851 CN 00130851 CN 00130851 A CN00130851 A CN 00130851A CN 1302920 A CN1302920 A CN 1302920A
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Abstract
An electrolysis method for sodium sulfate and sodium hydrogen sulfate, which is used for desulfurizing fume and suitable for anionic-membrane electrolyzer is disclosed. A 20-30% solution of sodium sulfate and sodium hydrogen sulfate at 55-90 deg.C is introduced to electrolyzer through its cathode inlet. The mixed solution of 1-3% sodium hydroxide and 18-28% sodium sulfate is discharged from the outlet. A 1-5% solution of diluted sulfuric acid at 55-90 deg.C is introduced to the electrolyzer through said inlet. The 5-10 % concentration solution of sulfuric acid is discharged from said outlet. The current density is 1500-3500 A/sq.m. Its advantages is low consumption of energy.
Description
The present invention relates to a kind of electrolysis process, more particularly relate to a kind of cooperation flue gas desulfurization, and can cut down the consumption of energy, improve the sodium sulfate of output object concentration, the electrolysis process of sodium pyrosulfate.
In industries such as papermaking, chemical industry, metallurgy, flue gas desulfurization environmental protection, a large amount of sodium sulfate (Na that mainly contain are arranged
2SO
4) and sodium pyrosulfate (NaHSO
4H
2O) solution is discharged, if the waste liquid that contains above-mentioned composition comprehensive reutilization has in addition not only been wasted renewable resources in vain, and polluted environment.Therefore, launched to handle the research of sodium sulfate and sodium pyrosulfate both at home and abroad energetically, and obtained remarkable progress with electrolytic process.Can make sodium hydroxide (NaOH) and sulfuric acid (H by electrolysis to contains sodium sulfate, sodium bisulfate
2SO
4), and sodium hydroxide and sulfuric acid have a wide range of applications in chemical industry.Existing electrolytic sulfite, the used electrolyzer of sodium pyrosulfate mostly adopt cationic exchange membranous type, diaphragm type, bipolar membranous type, dual membranes and three chambers type etc.Though above-mentioned electrolyzer can make the sodium hydroxide of higher concentration, but in some specific occasions, occasion as flue gas desulfurization, not high to concentration sodium hydroxide and purity requirement, containing other a large amount of compositions in the sodium hydroxide solution after the electrolysis does not have too much influence yet, because sodium hydroxide solution is to recycle as sweetening agent; On the contrary, the sulfuric acid in the anodic product wishes that then concentration and purity are high more good more.In this specific occasion, adopt electrolysis grooved commonly used now, obviously not really suitable, exist or investment and working cost too high, perhaps pre-treatment and aftertreatment technology complexity, shortcoming such as perhaps the industrialization maturity of technology and material is low.Though being suitable for the flue gas desulfurization occasion, uses the anionic membrane electrolyzer, but owing to there is certain technical difficulty, thereby still do not have up to now about with the processing parameter of anionic membrane electrolytic tank electrolysis sodium sulfate, sodium pyrosulfate and the document record that how to improve its electrolysis usefulness, do not have corresponding industry yet and report.Therefore, provide a cover to be used for the flue gas desulfurization occasion, and be applicable to the processing method of anionic membrane electrolyzer, just become a technical problem that needs to be resolved hurrily.
Purpose of the present invention promptly is to provide a kind of flue gas desulfurization occasion that is used for, and be suitable for a kind of sodium sulfate of anionic membrane electrolyzer, the electrolysis process of sodium pyrosulfate, electrolytic product can be suitable in the flue gas desulfurization the concentration requirement of sweetening agent, and its mixed economy technical indicator is fit to industrial applications.
For achieving the above object, the invention provides the electrolysis process of a kind of sodium sulfate, sodium pyrosulfate, the method is characterized in that:
A, to import concentration from the electric tank cathode liquid inlet be that 20-30%, temperature are 55-90 ℃ sodium sulfate and sodium bisulfate; Derive 1%-3% sodium hydroxide and 18%-28% sodium sulfate mixing solutions from the electric tank cathode liquid exit;
B, import concentration from the anode electrolytic cell liquid inlet be 55-90 ℃ dilution heat of sulfuric acid greater than 1%-5%, temperature; Deriving concentration from the anode electrolytic cell liquid exit is the concentrated sulfuric acid solution of 5%-10%;
C, electrolytic current density are 1500-3500A/m
2
Described electrolyzer is the two chambers of monofilm anionic membrane electrolyzers.
In temperature is that 55-90 ℃, current density are 1500-3500A/m
2Operating mode under, the voltage of unit tank of electrolyzer is 3.0-3.8V.
Positively effect of the present invention is, the sodium sulfate that it provided, the electrolysis process of sodium pyrosulfate are from the actual needs of flue gas desulfurization, reasonably use the anionic membrane electrolyzer, formulated effective processing parameter, make the concentration of output object NaOH can not only be applicable in the flue gas desulfurization concentration requirement, and energy consumption is lower to sweetening agent.Experiment confirm is used method of the present invention, and the NaOH that every production is a ton 100%, its electrolysis energy consumption are reduced to 3000 degree.Simultaneously, also obtain the higher vitriol oil of concentration in its output object, thereby had bigger practical value.
The present invention will be described in more detail below by a preferred embodiment.
The present invention is to carry out in the anionic membrane electrolyzer of the two chambers of monofilm to the electrolysis of sodium sulfate, sodium pyrosulfate.Electrolyzer is made up of cathode compartment, anolyte compartment, has anion-exchange membrane to separate between cathode compartment and the anolyte compartment, and anolyte compartment and cathode compartment all have liquid introducing port, liquid export mouth, gas export mouth respectively.Under above operating mode, the design cell bath voltage of electrolyzer is lower than 3.5V.Constant temperature is 85～90 ℃ in the groove, and the temperature of electrolyzer electrolyte inside should guarantee to be not less than the temperature of inlet solution.Anionic membrane adopts the AHA type.Electrolyzer preferably adopts zero pole span design, and bath voltage is reduced as far as possible.
The major technique means of electrolytic sulfite of the present invention, sodium pyrosulfate method are the strength of solution and the temperature of control electric tank cathode and anodic dissolution entrance and exit, and electrolytic current density.
In the present embodiment, the concentration that imports electric tank cathode solution inlet metabisulfite solution is 20%, is heated to 75-80 ℃ before entering electrolyzer.Strength of solution, temperature are high more, and the energy consumption of electrolysis system alkali is more little, but too high concentration will cause the fluid temperature of whole desulphurization system must keep higher level, otherwise can cause local Yin Wendu lower and produce crystallization; Too high temperature then easily causes the electrolytic solution boiling, and cathode gas band water is serious, increases the difficulty of gas-liquid separation.
The flow of control cathode inlet solution, the NaOH concentration that makes the mixing solutions of cathode outlet is 1%, sodium sulfate concentration is 19%.The concentration of NaOH solution is low more, and the energy consumption of electrolysis system alkali is then low more.But too low NaOH concentration might not reach the requirement to the system alkali concn, when for example not reaching desulfurization to the concentration requirement of sweetening agent.
Import 75-80 ℃ 1% dilution heat of sulfuric acid from anodic dissolution inlet.The too low solution conductivity performance that then is unfavorable for keeping electrolyzer anode chamber of strength of solution.But can increase the reverse osmosis effect of sulfuric acid when concentration is too high, thereby increase the energy consumption of system alkali to cathode compartment.Temperature is high more, and the energy consumption of electrolysis system alkali is more little, but too high temperature then easily causes the electrolytic solution boiling, and anodic gas band water is serious, increases the difficulty of gas-liquid separation.
The flow of control anode inlet sulphuric acid soln, making anode liquid export mouth derive concentration is 5% concentrated sulfuric acid solution.Anode electrolytic cell concentration is too low, certainly will increase the vitriolization difficulty, can increase the reverse osmosis effect of sulfuric acid to cathode compartment when concentration is too high, thereby increases the energy consumption of system alkali.
Electrolytic current density is 3000A/cm
2, current density is low more, and electrolysis energy consumption is low more, but has increased electrolytic working area, increases the initial cost of equipment.
After passing through the electrolysis of sufficient time and reaching steady state, the NaOH output by the test cathode compartment can obtain: the NaOH that every generation is 1 ton 100%, its electrolysis energy consumption are lower than 3000 degree.
Claims (3)
1, the electrolysis process of a kind of sodium sulfate, sodium pyrosulfate is characterized in that:
A, to import concentration from the electric tank cathode liquid inlet be that 20-30%, temperature are 55-90 ℃ sodium sulfate and sodium bisulfate; Derive 1%-3% sodium hydroxide and 18%-28% sodium sulfate mixing solutions from the electric tank cathode liquid exit;
B, import concentration from the anode electrolytic cell liquid inlet be 55-90 ℃ dilution heat of sulfuric acid greater than 1%-5%, temperature; Deriving concentration from the anode electrolytic cell liquid exit is the concentrated sulfuric acid solution of 5%-10%;
C, electrolytic current density are 1500-3500A/m
2
According to the method for claim 1, it is characterized in that 2, described electrolyzer is the two chambers of monofilm anionic membrane electrolyzers.
3, according to the method for claim 1, it is characterized in that, is that 55-90 ℃, current density are 1500-3500A/m in temperature
2Operating mode under, the voltage of unit tank of electrolyzer is 3.0-3.8V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00130851 CN1302920A (en) | 2000-12-14 | 2000-12-14 | Electrolysis process for sodium sulfate or sodium hydrogen sulfate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00130851 CN1302920A (en) | 2000-12-14 | 2000-12-14 | Electrolysis process for sodium sulfate or sodium hydrogen sulfate |
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| Publication Number | Publication Date |
|---|---|
| CN1302920A true CN1302920A (en) | 2001-07-11 |
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|---|---|---|---|
| CN 00130851 Pending CN1302920A (en) | 2000-12-14 | 2000-12-14 | Electrolysis process for sodium sulfate or sodium hydrogen sulfate |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101863500A (en) * | 2010-06-04 | 2010-10-20 | 中南大学 | Method for producing alumina with aluminum-containing metallurgical material |
| CN103060834A (en) * | 2011-10-20 | 2013-04-24 | 厦门紫金矿冶技术有限公司 | Technological process for electrolyzing sodium sulfate |
| CN105849317A (en) * | 2013-10-23 | 2016-08-10 | 内玛斯卡锂公司 | Processes and systems for preparing lithium hydroxide |
| CN109402658A (en) * | 2018-12-28 | 2019-03-01 | 四川省银河化学股份有限公司 | A kind of method of chromium-containing sulfate, sodium bisulfate electrolytic regeneration soda |
| CN109930168A (en) * | 2019-04-12 | 2019-06-25 | 邯郸市同俊达矿山设备股份有限公司 | A kind of processing unit and processing method of hopcalite agent waste liquid sodium sulphate liquid |
| CN111472016A (en) * | 2020-04-15 | 2020-07-31 | 中南大学 | Method for preparing hydrogen peroxide by electrolyzing and recovering sodium sulfate waste liquid |
-
2000
- 2000-12-14 CN CN 00130851 patent/CN1302920A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101863500A (en) * | 2010-06-04 | 2010-10-20 | 中南大学 | Method for producing alumina with aluminum-containing metallurgical material |
| CN101863500B (en) * | 2010-06-04 | 2012-11-14 | 中南大学 | Method for producing alumina with aluminum-containing metallurgical material |
| CN103060834A (en) * | 2011-10-20 | 2013-04-24 | 厦门紫金矿冶技术有限公司 | Technological process for electrolyzing sodium sulfate |
| CN103060834B (en) * | 2011-10-20 | 2016-08-24 | 厦门紫金矿冶技术有限公司 | A kind of technological process of electrolytic sulfite |
| CN105849317A (en) * | 2013-10-23 | 2016-08-10 | 内玛斯卡锂公司 | Processes and systems for preparing lithium hydroxide |
| CN105849317B (en) * | 2013-10-23 | 2018-11-27 | 内玛斯卡锂公司 | Prepare the method and system of lithium hydroxide |
| CN109402658A (en) * | 2018-12-28 | 2019-03-01 | 四川省银河化学股份有限公司 | A kind of method of chromium-containing sulfate, sodium bisulfate electrolytic regeneration soda |
| CN109930168A (en) * | 2019-04-12 | 2019-06-25 | 邯郸市同俊达矿山设备股份有限公司 | A kind of processing unit and processing method of hopcalite agent waste liquid sodium sulphate liquid |
| CN111472016A (en) * | 2020-04-15 | 2020-07-31 | 中南大学 | Method for preparing hydrogen peroxide by electrolyzing and recovering sodium sulfate waste liquid |
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Owner name: SHENZHEN KELEIEN BLUE-SKY TECHNOLOGY CO., LTD Free format text: FORMER OWNER: SHENZHEN KELEIEN ENVIRONMENTAL TECHNOLOGY CO., LTD Effective date: 20030315 |
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Effective date of registration: 20030315 Address after: 518026 Guangdong city of Shenzhen province Futian District CaiTian deep South Garden A block, 1901 Applicant after: Shenzhen Kelein Lantian Technology Co., Ltd. Address before: 518026 Guangdong city of Shenzhen province Futian District CaiTian deep South Garden A block, 1901 Applicant before: Keleien Environment Science and Technology Co Ltd, Shenzhen City |
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