CN104326494A - Medium-pressure method for producing sodium nitrate - Google Patents
Medium-pressure method for producing sodium nitrate Download PDFInfo
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- CN104326494A CN104326494A CN201410684467.2A CN201410684467A CN104326494A CN 104326494 A CN104326494 A CN 104326494A CN 201410684467 A CN201410684467 A CN 201410684467A CN 104326494 A CN104326494 A CN 104326494A
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- sodiumnitrate
- sodium nitrate
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- middle pressure
- nitric acid
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D9/00—Nitrates of sodium, potassium or alkali metals in general
- C01D9/06—Preparation with gaseous nitric acid or nitrogen oxides
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a medium-pressure method for producing sodium nitrate. The method comprises the following steps: preparing high-concentration nitrogen oxide gas by virtue of an idle medium-pressure nitric acid device, feeding the nitrogen oxide gas into an alkali absorption tower system, preparing a neutralization solution for sodium nitrate and sodium nitrite in the alkali absorption tower system, sending the neutralization solution into a conversion tower and simultaneously adding nitric acid and air into the conversion tower so that sodium nitrite in the neutralization solution is continuously converted into sodium nitrate, then sending the conversion solution into an evaporator for evaporating, sending the evaporated conversion solution into a crystallizer and crystallizing the conversion solution under a negative pressure and then feeding the crystallization solution into a centrifuge for carrying out separation treatment so as to separate crystal in the crystallization solution from the mother liquor and finally producing the product sodium nitrate. By the medium-pressure method for producing sodium nitrate disclosed by the invention, compared with the prior art, the construction investment can be saved by about 15%, the energy consumption and the operating cost of per ton of product are significantly reduced and the method has considerable energy-saving effect and economic benefits.
Description
Technical field
The present invention relates to the production technique field of nitrate, specifically a kind of method of middle pressure production SODIUMNITRATE.
Background technology
SODIUMNITRATE and Sodium Nitrite, be commonly called as " salt made from earth containing a comparatively high percentage of sodium chloride ".Salt made from earth containing a comparatively high percentage of sodium chloride production method has tail gas method and direct method two kinds.So-called tail gas method is that non-pressure process nitric acid tail gas pressure is about 10kPa (G) through Alkali absorption production salt made from earth containing a comparatively high percentage of sodium chloride, national output about 120,000 t.Direct method is that ammonia oxidation generates nitrogen oxide pressure 0.1MPa (G), produces salt made from earth containing a comparatively high percentage of sodium chloride, national output about 1,080,000 t through Alkali absorption.In salt made from earth containing a comparatively high percentage of sodium chloride, the ratio of SODIUMNITRATE and Sodium Nitrite is about 1:1.
Tail gas method relies on non-pressure process nitric acid, along with the adjustment of China's nitric acid industry production industrial structure, non-pressure process nitric acid substitute by double pressurized method nitric acid, tail gas method will be compressed until withdraw from the market.Direct method is low because of absorption pressure, and absorb bulky, energy consumption is high, consumes high, and exhaust emissions concentration is high, and processing costs is high, has become the important factor of restriction China salt made from earth containing a comparatively high percentage of sodium chloride development.
China's nitric acid industry is in the adjusting stage of the industrial structure, substitutes middle-pressure process nitric acid with double pressurized method, causes existing 1,270,000 t/a middle-pressure process nitric acid plants to stop production idle, causes a large amount of wastings of resources.
Summary of the invention
Technical assignment of the present invention is to provide a kind of method of middle pressure production SODIUMNITRATE.
Technical assignment of the present invention realizes in the following manner, and the method step is as follows:
Idle middle pressure nitric acid plant is utilized to produce the oxynitride gas of high density, oxynitride pneumatic transmission is entered Alkali absorption Tower System, the neutralizer of obtained SODIUMNITRATE and Sodium Nitrite in Alkali absorption Tower System, neutralizer is sent in converter, simultaneously in converter, add nitric acid and the Sodium Nitrite in neutralizer is converted into SODIUMNITRATE by air continuously, afterwards conversion fluid is sent into vaporizer and carry out evaporation process, conversion fluid after evaporation sends into crystallizer, under negative pressure crystallization treatment is carried out to conversion fluid, then crystal solution is sent into whizzer and carry out separating treatment, crystallization in crystal solution is separated with mother liquor, finally produce product SODIUMNITRATE.
The oxidisability of described oxynitride gas is 60%-80%.
Described vaporizer is MVR vaporizer, and MVR is the abbreviation of English mechanical vapor recompression.
The secondary steam of described MVR evaporator evaporation returns to MVR vaporizer as heating heat energy after the pressurization of trailing plants thatch blower fan.
Described crystallizer is OSLO crystallizer, and conversion fluid is 0.4-0.6mm in the granularity of OSLO crystallizer intercrystalline.
Described whizzer is HY800-N whizzer.
Compared to the prior art the method for middle pressure production SODIUMNITRATE of the present invention, can save construction investment about 15%, and ton product energy consumption and ton working cost all significantly reduces, and have considerable energy-saving effect and economic benefit.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic flow sheet of the method for middle pressure production SODIUMNITRATE.
Embodiment
Embodiment 1:
Idle middle pressure nitric acid plant is utilized to produce the oxynitride gas of high density, the oxidisability of oxynitride gas is 60%, oxynitride pneumatic transmission is entered Alkali absorption Tower System, Alkali absorption Tower System is made up of 5 Alkali absorption towers, the concentration of lye that Alkali absorption Tower System uses is greatly about 26%, alkali lye adds from last Alkali absorption tower, and one by one forward tower fall liquid, finally from the first or second Alkali absorption tower fluid; The neutralizer of obtained SODIUMNITRATE and Sodium Nitrite in Alkali absorption Tower System, neutralizer is sent in converter, simultaneously in converter, add nitric acid and the Sodium Nitrite in neutralizer is converted into SODIUMNITRATE by air continuously, afterwards conversion fluid is sent into MVR vaporizer and carry out evaporation process, evaporative concn is concentrated into 41.8% (massfraction) from 29.6%, and the secondary steam of MVR evaporator evaporation returns to MVR vaporizer as heating heat energy after the pressurization of trailing plants thatch blower fan; Conversion fluid after evaporation sends into OSLO crystallizer, and carry out crystallization treatment to conversion fluid under negative pressure, the granularity of crystallization is 0.4mm; Then crystal solution is sent into HY800-N whizzer and carry out separating treatment, the crystallization in crystal solution is separated with mother liquor, finally produces product SODIUMNITRATE.
Embodiment 2:
Idle middle pressure nitric acid plant is utilized to produce the oxynitride gas of high density, the oxidisability of oxynitride gas is 70%, oxynitride pneumatic transmission is entered Alkali absorption Tower System, Alkali absorption Tower System is made up of 6 Alkali absorption towers, the concentration of lye that Alkali absorption Tower System uses is greatly about 26%, alkali lye adds from last Alkali absorption tower, and one by one forward tower fall liquid, finally from the first or second Alkali absorption tower fluid; The neutralizer of obtained SODIUMNITRATE and Sodium Nitrite in Alkali absorption Tower System, neutralizer is sent in converter, simultaneously in converter, add nitric acid and the Sodium Nitrite in neutralizer is converted into SODIUMNITRATE by air continuously, afterwards conversion fluid is sent into MVR vaporizer and carry out evaporation process, evaporative concn is concentrated into 41.8% (massfraction) from 29.6%, and the secondary steam of MVR evaporator evaporation returns to MVR vaporizer as heating heat energy after the pressurization of trailing plants thatch blower fan; Conversion fluid after evaporation sends into OSLO crystallizer, and carry out crystallization treatment to conversion fluid under negative pressure, the granularity of crystallization is 0.5mm; Then crystal solution is sent into HY800-N whizzer and carry out separating treatment, the crystallization in crystal solution is separated with mother liquor, finally produces product SODIUMNITRATE.
Embodiment 3:
Idle middle pressure nitric acid plant is utilized to produce the oxynitride gas of high density, the oxidisability of oxynitride gas is 80%, oxynitride pneumatic transmission is entered Alkali absorption Tower System, Alkali absorption Tower System is made up of 6 Alkali absorption towers, the concentration of lye that Alkali absorption Tower System uses is greatly about 26%, alkali lye adds from last Alkali absorption tower, and one by one forward tower fall liquid, finally from the first or second Alkali absorption tower fluid; The neutralizer of obtained SODIUMNITRATE and Sodium Nitrite in Alkali absorption Tower System, neutralizer is sent in converter, simultaneously in converter, add nitric acid and the Sodium Nitrite in neutralizer is converted into SODIUMNITRATE by air continuously, afterwards conversion fluid is sent into MVR vaporizer and carry out evaporation process, evaporative concn is concentrated into 41.8% (massfraction) from 29.6%, and the secondary steam of MVR evaporator evaporation returns to MVR vaporizer as heating heat energy after the pressurization of trailing plants thatch blower fan; Conversion fluid after evaporation sends into OSLO crystallizer, and carry out crystallization treatment to conversion fluid under negative pressure, the granularity of crystallization is 0.6mm; Then crystal solution is sent into HY800-N whizzer and carry out separating treatment, the crystallization in crystal solution is separated with mother liquor, finally produces product SODIUMNITRATE.
By above-mentioned working method, to change products SODIUMNITRATE to produce 30000 t/a middle-pressure process nitric acid per year, compared with traditional direct method salt made from earth containing a comparatively high percentage of sodium chloride, save construction investment 15%, the energy consumption of ton product is marked coal from 307kg and is down to 60kg and marks coal, and ton product saves working cost about 230 yuan.
By embodiment above, described those skilled in the art can be easy to realize the present invention.But should be appreciated that the present invention is not limited to above-mentioned several embodiments.On the basis of disclosed embodiment, described those skilled in the art can the different technical characteristic of arbitrary combination, thus realizes different technical schemes.
Claims (6)
1. press the method for production SODIUMNITRATE in, it is characterized in that, the method step is as follows:
Idle middle pressure nitric acid plant is utilized to produce the oxynitride gas of high density, oxynitride pneumatic transmission is entered Alkali absorption Tower System, the neutralizer of obtained SODIUMNITRATE and Sodium Nitrite in Alkali absorption Tower System, neutralizer is sent in converter, simultaneously in converter, add nitric acid and the Sodium Nitrite in neutralizer is converted into SODIUMNITRATE by air continuously, afterwards conversion fluid is sent into vaporizer and carry out evaporation process, conversion fluid after evaporation sends into crystallizer, under negative pressure crystallization treatment is carried out to conversion fluid, then crystal solution is sent into whizzer and carry out separating treatment, crystallization in crystal solution is separated with mother liquor, finally produce product SODIUMNITRATE.
2. the method for middle pressure production SODIUMNITRATE according to claim 1, is characterized in that, the oxidisability of described oxynitride gas is 60%-80%.
3. the method for middle pressure production SODIUMNITRATE according to claim 1, it is characterized in that, described vaporizer is MVR vaporizer.
4. the method for middle pressure production SODIUMNITRATE according to claim 3, is characterized in that, the secondary steam of described MVR evaporator evaporation returns to MVR vaporizer as heating heat energy after the pressurization of trailing plants thatch blower fan.
5. the method for middle pressure production SODIUMNITRATE according to claim 1, it is characterized in that, described crystallizer is OSLO crystallizer, and conversion fluid is 0.4-0.6mm in the granularity of OSLO crystallizer intercrystalline.
6. the method for middle pressure production SODIUMNITRATE according to claim 1, it is characterized in that, described whizzer is HY800-N whizzer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410684467.2A CN104326494A (en) | 2014-11-25 | 2014-11-25 | Medium-pressure method for producing sodium nitrate |
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| CN201410684467.2A CN104326494A (en) | 2014-11-25 | 2014-11-25 | Medium-pressure method for producing sodium nitrate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152909A (en) * | 2015-06-30 | 2015-12-16 | 山东省食品发酵工业研究设计院 | Concentration and crystallization device for sodium gluconate production and process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696024A (en) * | 2009-10-30 | 2010-04-21 | 石家庄凤山化工有限公司 | Stirring-free method and device for producing sodium nitrate through continuous conversion |
| CN103933848A (en) * | 2014-04-24 | 2014-07-23 | 北京中环新锐环保技术有限公司 | Process and device for treating nitric oxide in tail gas generated in nitric acid and nitrate production |
-
2014
- 2014-11-25 CN CN201410684467.2A patent/CN104326494A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696024A (en) * | 2009-10-30 | 2010-04-21 | 石家庄凤山化工有限公司 | Stirring-free method and device for producing sodium nitrate through continuous conversion |
| CN103933848A (en) * | 2014-04-24 | 2014-07-23 | 北京中环新锐环保技术有限公司 | Process and device for treating nitric oxide in tail gas generated in nitric acid and nitrate production |
Non-Patent Citations (2)
| Title |
|---|
| 《国外工业技术》编辑部: "《国外工业技术（三）》", 31 December 1982, 上海科学技术文献出版社 * |
| 王箴等: "《化工辞典》", 30 April 1985, 化学工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152909A (en) * | 2015-06-30 | 2015-12-16 | 山东省食品发酵工业研究设计院 | Concentration and crystallization device for sodium gluconate production and process |
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Application publication date: 20150204 |