CN102642851B - Production method of high-purity sodium bisulfite solution - Google Patents
Production method of high-purity sodium bisulfite solution Download PDFInfo
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- CN102642851B CN102642851B CN201210139750.8A CN201210139750A CN102642851B CN 102642851 B CN102642851 B CN 102642851B CN 201210139750 A CN201210139750 A CN 201210139750A CN 102642851 B CN102642851 B CN 102642851B
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Abstract
The invention belongs to the technical field of chemical engineering production, relates to a production method of a high-purity sodium bisulfite solution, and is suitable for development of products containing sulfur dioxide gas. The production method is characterized in that gas containing sulfur dioxide is led into absorption towers and is absorbed with a sodium hydroxide solution, the absorption rate approaches to 100% after complete absorption through three stages of towers, finally the concentration of sulfur dioxide discharged out of the absorption tower of a third stage is far smaller than a national discharge standard, and tail gas reaches the standard and is discharged directly. The sodium bisulfite solution prepared by the production method is high in purity, is not lower than 30% in purity, and can be suitable for industrial departments of foods and the like.
Description
Technical field
The invention belongs to chemical production technical field, relate to a kind of production method of sodium sulfite solution.
Background technology
Sodium sulfite solution can be used as the SYNTHETIC OPTICAL WHITNER of textile industry cotton fabric, and the reductive agent in the industry such as dyestuff, papermaking, process hides, chemosynthesis, as the reductive agent in acrylic fiber production process.Also can be used for producing the industries such as medicine intermediate, photographic developer, food bleaching agent, sanitas, antioxidant.The manufacture method compared of producing at present sodium sulfite solution is single, and traditional industry production method is by the aqueous sodium carbonate that makes soluble in water industrial sodium carbonate, toward wherein passing into sulfurous gas to certain pH value, makes product.Owing to containing sodium-chlor, iron and other mechanical impuritys in industrial sodium carbonate, and traditional industry method lacks good exquisite means, therefore be difficult to make purity sodium sulfite solution.The needs that only can meet general industry purposes with the sodium sulfite solution that current commercial run is produced, some department is such as foodstuffs industry requires to use high-purity solution of sodium bisulfite, and this simple method just cannot meet.
Summary of the invention
The present invention is directed to deficiency and the unicity of current sodium sulfite solution production method, propose the method for a new production high-purity solution of sodium bisulfite.The sodium sulfite solution quality that the present invention produces is higher applicable to industrial sectors such as medicine, food, has wide market outlook.In addition,, along with the increasingly stringent requirement of environmental administration to sulfur dioxide pollution thing discharge value, so the element sulphur in industrial production tail gas is accomplished to recycling has just become extremely urgent thing as much as possible.And the present invention by with sodium hydroxide solution to greatest extent directly sulfur dioxide absorption gas make product, therefore also can be used for processing the industrial gaseous waste that contains sulfur dioxide gas, element sulphur is turned waste into wealth, not only increased the economic benefit of enterprise but also increased the social benefit of enterprise, for environmental protection contributes.
Main technical schemes of the present invention: the production method of high-purity solution of sodium bisulfite, be characterized in the gas that contains sulfurous gas to introduce absorption tower, absorb with sodium hydroxide solution, through the absorption completely of three grades of towers, specific absorption approaches 100%, finally discharge the sulfur dioxide concentration on third stage absorption tower much smaller than discharging standards, tail gas direct discharge up to standard.
Usually, the present invention is achieved like this: drive at the beginning of operation, three grades of absorption towers pump into respectively sodium hydroxide solution as initial cycle liquid, and the gas that contains sulfurous gas is introduced to first step absorption tower, (adopt two tower parallel connections, be used alternatingly).Pass into after gas, enter the sulfur dioxide gas not reacted on first step absorption tower and enter successively again the second stage, third stage absorption tower, the abundant contact reacts of gas and absorption liquid in each tower, in each tower circulation fluid the content of sodium bisulfite be prime higher than rear class, the content of S-WAT is that prime is lower than rear class.As the first step absorption tower of product output, obtain meeting the sodium sulfite solution of product requirement by controlling the pH value of first step absorption tower solution and two parameters of solution density.When the circulation fluid pH value in tower reaches 3.6-4, circulation fluid density is 1.33g/cm simultaneously
3time, in solution, the massfraction of sodium bisulfite reaches 35%.This circulate soln enters underground scale tank through the valve gravity flow of opening on product conduit, after metering, can pump into sodium sulfite solution storage tank stores.
In the time that the circulation fluid in one of them first step absorption tower can be used as product output, the sulfur dioxide gas of introducing is switched to another first step absorption tower immediately by automatic regulating valve, repeats operation, ensures to produce to carry out continuously.In production process, by adopting pH meter and densometer to detect the technic index of absorption cycle liquid, ensure quality product.The heat that system produces is removed by plate-type heat exchanger.Sulfur dioxide gas is after three grades of absorptions, and specific absorption approaches 100%, finally discharges the sulfur dioxide concentration on third stage absorption tower much smaller than discharging standards, and tail gas can direct discharge up to standard.
The sodium sulfite solution purity making by the inventive method is high, is not less than 30%, applicable to industrial sectors such as medicine, food.
Brief description of the drawings
Accompanying drawing 1 is embodiment of the present invention high-purity solution of sodium bisulfite technological process of production sketch.
In accompanying drawing, 1-first grade absorption tower a, 2-first grade absorption tower b, 3-plate-type heat exchanger, 4-automatic regulating valve, 5-densometer, 6-pH meter.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.
case study on implementation:
Case of the present invention be 30kt/a high purity sodium sulfite solution production equipment taking certain Fine Chemical Works as example, the sodium sulfite solution that this factory produces is as the production of downstream foodstuffs industry.Gas condition is as follows:
Temperature: 70 DEG C of pressure: 4Kpa flow: 4300Nm
3/ h
Composition: SO
2o
2n
2
wt% 7.5 8.36 84.14
Sodium hydroxide solution (wt%): 20%
As shown in Figure 1, blower export is drawn the sulfur dioxide gas of approximately 70 DEG C of concentration approximately 7.5% temperature, enters successively three grades of absorption towers and fully contacts with absorption cycle liquid in technical process.In each tower circulation fluid the content of sodium bisulfite be prime higher than rear class, the content of S-WAT is that prime is lower than rear class.As the first step absorption tower of product output, when the circulation fluid pH value in tower reaches 3.6-4, circulation fluid density is 1.33g/cm simultaneously
3time, in solution, the massfraction of sodium bisulfite reaches 35%.This circulate soln enters underground scale tank through the valve gravity flow of opening on product conduit, pumps into sodium sulfite solution storage tank stores after metering.
In the time that the circulation fluid in one of them first grade absorption tower a 1 can be used as product output, the sulfur dioxide gas of introducing is switched to another first grade absorption tower b 2 immediately by automatic regulating valve 4, repeats operation, ensures to produce to carry out continuously.In production process, by adopting pH meter 6 and densometer 5 to detect the technic index of absorption cycle liquid, ensure quality product.The heat that system produces is removed by plate-type heat exchanger 3.Sulfur dioxide gas is after three grades of absorptions, and specific absorption approaches 100%, finally discharges the sulfur dioxide concentration on third stage absorption tower much smaller than discharging standards, and tail gas can direct discharge up to standard.
30,000 tons of the sodium sulfite solution of the present embodiment device annual output 35%
Claims (1)
1. the production method of a high-purity solution of sodium bisulfite; it is characterized in that the gas that contains sulfurous gas to introduce absorption tower; absorb with sodium hydroxide solution; through the absorption completely of three grades of towers; specific absorption approaches 100%; finally discharge the sulfur dioxide concentration on third stage absorption tower much smaller than discharging standards, tail gas direct discharge up to standard; Described first step absorption tower adopts two tower parallel connections, is used alternatingly; The intake ducting on first step absorption tower adopts automatic regulating valve to control unlatching, the control of source of the gas when being used alternatingly absorption tower; Reach 3.6-4 by the pH value of controlling first step absorption tower solution, density is 1.33g/cm
3.
2. method according to claim 1, is characterized in that the system of every first stage tower is moved thermal recovery plate-type heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210139750.8A CN102642851B (en) | 2012-05-08 | 2012-05-08 | Production method of high-purity sodium bisulfite solution |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210139750.8A CN102642851B (en) | 2012-05-08 | 2012-05-08 | Production method of high-purity sodium bisulfite solution |
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| CN102642851A CN102642851A (en) | 2012-08-22 |
| CN102642851B true CN102642851B (en) | 2014-10-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103090190B (en) * | 2013-01-31 | 2014-06-25 | 北京七星华创电子股份有限公司 | Chemical liquid distribution system |
| CN110590614A (en) * | 2019-08-28 | 2019-12-20 | 王建峰 | Separation and purification process of taurine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1385719A (en) * | 1971-08-06 | 1975-02-26 | Hitachi Ltd | Process and apparatus for purifying exhaust gas |
| US4670234A (en) * | 1984-01-25 | 1987-06-02 | Heinz Holter | Process for stripping nitrogen oxides and sulphur oxides as well as optionally other noxious elements of flue gas from combustion plants |
| CN1062332A (en) * | 1990-12-11 | 1992-07-01 | 化学工业部天津化工研究院 | The production method of high-purity solution of sodium bisulfite |
| CN1864811A (en) * | 2006-04-10 | 2006-11-22 | 广州市天赐三和环保工程有限公司 | Fume desulfurizing process employing multiple circulation and stable double alkali method and apparatus |
| CN101444699A (en) * | 2008-12-16 | 2009-06-03 | 刘存宝 | Technical method for removing sulfur dioxide in flue gas by using sodium sulfite and equipment thereof |
-
2012
- 2012-05-08 CN CN201210139750.8A patent/CN102642851B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1385719A (en) * | 1971-08-06 | 1975-02-26 | Hitachi Ltd | Process and apparatus for purifying exhaust gas |
| US4670234A (en) * | 1984-01-25 | 1987-06-02 | Heinz Holter | Process for stripping nitrogen oxides and sulphur oxides as well as optionally other noxious elements of flue gas from combustion plants |
| CN1062332A (en) * | 1990-12-11 | 1992-07-01 | 化学工业部天津化工研究院 | The production method of high-purity solution of sodium bisulfite |
| CN1864811A (en) * | 2006-04-10 | 2006-11-22 | 广州市天赐三和环保工程有限公司 | Fume desulfurizing process employing multiple circulation and stable double alkali method and apparatus |
| CN101444699A (en) * | 2008-12-16 | 2009-06-03 | 刘存宝 | Technical method for removing sulfur dioxide in flue gas by using sodium sulfite and equipment thereof |
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Address after: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee after: China Petroleum & Chemical Corp. Patentee after: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Address before: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee before: China Petroleum & Chemical Corp. Patentee before: Nanhua Group Research Institute |
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