CN102502528B - High-purity sulfuric acid production method without distillation procedure and device of high-purity sulfuric acid production method - Google Patents
High-purity sulfuric acid production method without distillation procedure and device of high-purity sulfuric acid production method Download PDFInfo
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004821 distillation Methods 0.000 title abstract description 18
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000005406 washing Methods 0.000 claims abstract description 37
- 238000010521 absorption reaction Methods 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 24
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000003647 oxidation Effects 0.000 claims abstract description 22
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 16
- 238000001179 sorption measurement Methods 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 11
- 238000011049 filling Methods 0.000 claims abstract description 10
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 10
- 239000012498 ultrapure water Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 5
- 230000003197 catalytic effect Effects 0.000 claims abstract 4
- 235000011149 sulphuric acid Nutrition 0.000 claims description 32
- 239000001117 sulphuric acid Substances 0.000 claims description 31
- 239000002253 acid Substances 0.000 claims description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- 239000000243 solution Substances 0.000 claims description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 239000011572 manganese Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 8
- 239000006004 Quartz sand Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 235000010269 sulphur dioxide Nutrition 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 5
- 230000001131 transforming effect Effects 0.000 claims description 5
- 229910052720 vanadium Inorganic materials 0.000 claims description 5
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000011236 particulate material Substances 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 239000004291 sulphur dioxide Substances 0.000 claims description 3
- 229920006351 engineering plastic Polymers 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- 239000007800 oxidant agent Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 9
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- 230000000704 physical effect Effects 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
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- 239000007789 gas Substances 0.000 description 25
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- 238000005265 energy consumption Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 238000012856 packing Methods 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
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- 238000002360 preparation method Methods 0.000 description 1
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- 230000001698 pyrogenic effect Effects 0.000 description 1
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Abstract
The invention discloses a high-purity sulfuric acid production method without a distillation procedure and a device of the high-purity sulfuric acid production method. Sulfur trioxide/sulfur dioxide gas mixture generated after primary conversion in common industrial sulfuric acid production process is delivered to a treatment column with comprehensive functions of catalytically oxidizing sulfur dioxide, washing, absorbing and filtering metal ions and solid particles and the like. In the treatment column, sulfur dioxide is converted into sulfur trioxide by the aid of catalytic liquid, solid particles and metal ions in the gas are retained by the catalytic conversion liquid, converted and purified gas enters a solid particle material filling layer, and residual sulfur dioxide, solid particles and metal ions are removed by further chemical and physical actions such as catalytic oxidation, adsorption, filtering and separation and the like. Acquired high-purity sulfur trioxide further enters an absorption column, and is absorbed by high-purity sulfuric acid in the absorption column and high-purity water which is supplemented continuously, and high-purity sulfuric acid products with quality indexes meeting GB-T625-1989 standards of guaranteed reagent or analytical reagent is generated. The high-purity sulfuric acid production method and the device thereof are applicable to implementation on the basis of the common industrial sulfuric acid production process.
Description
Technical field
The invention belongs to a kind of high-purity sulphuric acid production method and device thereof, refer to a kind of to make raw material through once transforming sulphur trioxide/sulfur dioxide mixture gas that the back produces (be commonly called as in the industry one air-breathing) in the general industry sulfuric acid production process, through method and the device thereof of processes such as catalyzed oxidation, washing, absorption, filtration and absorption production high-purity sulphuric acid especially.
Background technology
High-purity sulphuric acid is the general designation of chemical pure sulfuric acid, analytical pure sulfuric acid, the acid of top grade bright sulfur and high-purity ultra-clean electronic-grade sulfuric acid.High-purity sulphuric acid is used for wet-cleaned, the etching of semiconductor wafers, the etching reagent of superelevation unicircuit (IC), printed circuit board (PCB), and accurate plating of making the metal components and parts is cleaned, and is one of key basic chemical industry material of hyundai electronics process industry,
Existing high-purity sulphuric acid is to be raw material with the industrial sulphuric acid, purifies by distillation and produces.Usually adopt atmospheric distillation, heating energy source has coal, oil, electricity etc.Wherein the production cost of coal, oil heating distillation method is lower, but technique controlling difficulty such as distillation temperature are big, and product purity is not high, and quality stability is poor, and environmental pollution is big, and maintenance of the equipment, maintenance, maintenance inconvenience cause unexpected injury to operator easily.Generally adopt the electrically heated water distilling apparatus in the industry at present, be divided into two kinds of outer electrothermic type and interior electrothermic types.The constant product quality of outer electrothermic type, easy to maintenance.But the energy consumption height (950～1000kwh/t), the unit production capacity is low, the production cost height, and the manual operation workload is big.Interior electrothermic type energy consumption is lower, and (650～700kwh/t), but that device is installed is complicated, maintenance, maintenance workload are bigger.In addition, these two kinds of electrically heated distillation method all exist easily to produce shortcomings such as azeotropic and bumping, technology stability is relatively poor, the exhaust emissions amount is big, bed drain purge is more, equipment scaling cleaning amount is bigger, are difficult to obtain high purity product.
Recently, patent of invention " the efficient energy-saving step temperature difference distillation production method of high-purity sulphuric acid (patent publication No.: CN101905873A) " and utility model patent " a kind of efficient energy-saving staged thermoelectricity heating distilling device (ZL201020277816.6); adopt the step temperature difference distillation method to produce high-purity sulphuric acid; power consumption 304kwh/t; the sulfuric acid rate of recovery 〉=99.8%; tail gas and waste sludge discharge≤0.2%, this technology has represented the most advanced level of present domestic production high-purity sulphuric acid.But because the sulfuric acid boiling point is up to 338 ℃, the power consumption of step temperature difference distillation method reaches 304kwh/t, remains greater energy consumption technology, and power consumption is one of main production cost; Production equipment adopting quartz glass material, under about Working environment more than 300 ℃, the damaged and maintenance of production equipment is another distinct issues.
Summary of the invention
The problem to be solved in the present invention is the defective that overcomes existing distillation method high energy consumption and the easy loss of production equipment, a kind of production technique of non-distilling is provided, namely the impure sulfur trioxide gas that produces in the general industry sulfuric acid production process (is contained impurity such as more sulfurous gas, particulate, metal ion after once transforming, be commonly called as one air-breathing), impose the method that processes such as catalyzed oxidation, washing, absorption, filtration and absorption are produced high-purity sulphuric acids.
A kind of high-purity sulphuric acid production method and device thereof of non-distilling have been designed according to the above-mentioned problem that need solve, this method is made unstripped gas with the sulphur trioxide/sulfur dioxide mixture gas that produces in the general industry sulfuric acid production process after once transforming, produce high-purity sulphuric acid through processes such as catalyzed oxidation, washing, absorption, filtration and absorptions, the step of this method and device thereof are
To begin production process behind the described unstripped gas injection processing post;
Described processing post is two sections compositions that are interconnected, and first section is equal inversion of phases washings, and second section is out-phase conversion adsorption filtration post, and this is handled post and is communicated with absorption column;
After described unstripped gas is injected the processing post, this unstripped gas is at first carried out the primary chemical physical treatment through the catalyzed oxidation washings, and eccysis solia particle, obtain high-purity sulfur trioxide gas through catalyzed oxidation adsorption filtration post advanced treatment again, this high-purity sulfur trioxide gas enters absorption column, the high purity water that is absorbed the circulation high-purity sulphuric acid in the post and constantly adds absorbs, and namely obtains the high-purity sulphuric acid product.
Wherein, described processing post is vertical post, has double-layer structure, and lower floor is equal inversion of phases washing column, and filling has the conversion washings of catalyzed oxidation washing function; The upper strata is catalyzed oxidation adsorption filtration post, the solid particulate materials of filling tool catalyzed oxidation adsorption filtration function.Described conversion washings is the high valence chrome acid solution, or high price mangaic acid solution, or high price metatitanic acid solution, or their two or more mixed solutions, this conversion washings becomes sulphur trioxide with Sulphur Dioxide, and solia particle and metal ion in the eccysis, separate raw materials gas.Described solid particulate materials refers to be coated with the porous acid resisting material of one or more oxygenants that mix mutually in chromium system or manganese system or titanium system or the vanadium system.Described porous acid resisting material refers to porous ceramic grain, quartz sand, silica glass particle.What load in the described absorption column is acid resisting material porous ceramic grain, quartz sand, silica glass particle.Described processing post and absorption column are cylindrical, handle post and absorption column material and are made by silica glass and/or engineering plastics.Described processing column diameter includes but not limited to 5～20 centimetres, and column length includes but not limited to 50～200 centimetres; The absorption column diameter includes but not limited to 5～15 centimetres, and column length includes but not limited to 50～200 centimetres.
The present invention has following advantage compared with the prior art:
1. the present invention reduces production energy consumption significantly.The sulfuric acid boiling point is up to 338 ℃, and the energy consumption cost of existing state-of-the-art step temperature difference distillation method is 304kwh/t, about 240 yuan/t.Energy consumption of the present invention is mainly from preparation high purity water and absorption recycle acid drive-motor, the about 55kwh/t of comprehensive energy consumption.
2. the present invention significantly improves the security of technology.The material overwhelming majority of high-purity sulphuric acid production equipment is silica glass, in the non-distilling high-purity sulphuric acid production method, the chemical reaction thermic transforms about 63 ℃ of washings temperature, about 45 ℃ of the chemical reaction thermic absorption column temperature of absorption process sulphur trioxide and water, miscellaneous part is all the normal temperature and pressure Working environment.Thereby technology of the present invention, avoided the problem of the easy explosion of silica glass under the hot conditions, significantly improve process safety.
3. the present invention significantly reduces the equipment use cost.The present invention carries out the production of high-purity sulphuric acid basically at normal temperature and pressure, avoided causing problems such as equipment material rapid ageing, the easy explosion of silica glass because of long term high temperature distillation, makes simple to operately, and maintenance of equipment, maintaining cost significantly reduce.
4. the present invention significantly reduces the high-purity sulphuric acid production cost.The pyrogenic distillation process has been avoided in high-purity sulphuric acid production of the present invention, significantly reduces production energy consumption, equipment loss and cost of labor, and production cost is higher than but close to the production cost of general industry sulfuric acid, significantly is lower than existing distillation method production cost.
5. the stability of improving the quality of products
In still-process, the solia particle in the liquid and metal ion, the vacuole that produces with the vapour-liquid azeotropic enters product, and this is that the restriction distillation method is produced the essence factor that high-purity sulphuric acid purity further improves purity.Existing distillation method is produced high-purity sulphuric acid, is difficult to suppress fully the generation of vapour-liquid azeotropism, can only produce the analytical pure product usually, if will obtain the top grade straight product, carry out second distillation, or implements to be difficult to the ultra-clean filtration of large-scale production.The present invention is by successional liquid scrubbing and solid packing post adsorption filtration two stages for the treatment of, and control gas flow stability, and sulfur trioxide gas purity height and the stay in grade of acquisition obtain the pure or analytical pure sulfuric acid of top grade of stay in grade through absorption.
Description of drawings
Accompanying drawing 1 is technical process and the device synoptic diagram thereof of the inventive method.
Embodiment
The ultimate principle of non-distilling high-purity sulphuric acid production method disclosed by the invention is:
In the general industry sulfuric acid production process, metal sulphur ore deposit or sulphur are through roasting gained gas after filtration after washing, purifying, catalyzed conversion of the Vanadium Pentoxide in FLAKES catalyst technological processs such as (sulphur trioxide transformation efficiencys about 99%), the sulphur trioxide of gained absorbs and the acquisition industrial sulphuric acid with industrial sulphuric acid and pure water, it is one air-breathing that sulfur trioxide gas herein is commonly called as, and the acid of producing accounts for total acid more than 95%.Unabsorbed gases is again through filtration, purification, Vanadium Pentoxide in FLAKES catalyst catalyzed conversion, obtains the higher sulfur trioxide gas of purity and is absorbed and forms two and inhale acid.One air-breathing 0.8～1% the sulfurous gas that contains contains more small solid particulate and metal ion, thereby can only manufacture sulfuric acid.The invention discloses a kind of one air-breathing processing post, this processing post has double-layer structure.Lower floor's filling high valence chrome acid solution, or high price mangaic acid solution, or high price metatitanic acid solution, or their two or more mixed acid solutions, thereby have the catalyzed oxidation washing function.This transforms one air-breathing importing in washings, and Sulphur Dioxide is become sulphur trioxide, and solia particle and metal ion in the eccysis, separate raw materials gas.The upper strata is the conversion separator column that filling is coated with the irregular solid, porous particles acid resisting material of one or more oxygenants in chromium system or manganese system or titanium system or the vanadium system, thereby has catalyzed oxidation and adsorption filtration function.Gas through transforming the washings processing enters the conversion separator column, and remaining sulfur dioxide is by further degree of depth conversion, and residual micro-solia particle is separated by further adsorption filtration with metal ion.The high-purity sulfur trioxide gas that obtains imports the absorption column that is filled with acid resisting materials such as porous ceramic grain, quartz sand, the broken pipe of silica glass, and the high purity water absorption that is recycled high-purity sulphuric acid and constantly adds generates the high-purity sulphuric acid product.
Be further described below by the present invention of embodiment.
Embodiment 1
Silica glass is handled column diameter 8cm, length overall 110cm.Wherein, transform the high 40cm of washing fluid column, injection contains the high valence chrome of catalyzer and the acidic mixed catalyzed oxidation liquid of high price manganese; The high 70cm of oxidation adsorption filtration post, being filled with manganese system and vanadium is the porous acid resisting material of oxygenant.Porous ceramic grain and quartz sand that filling is differed in size in silica glass absorption column diameter 8cm, the long 100cm, post, shape is various.Post is handled in one air-breathing importing of general industry sulfuric acid processed, transform the washings column temperature behind about 5min and reach about 65 ℃, open circulation and absorb sour valve, high-purity female acid with 98% absorbs purified sulfur trioxide gas, absorption column is rapidly heated to 47 ℃, in absorbing sour circulation loop, add high purity water slowly then, sulfuric acid concentration is maintained between 98～99%.Can make 98.43% sulfuric acid through continuous operation, determination of quality index the results are shown in table 1 the 5th row.
By table the 5 column data as seen, the inventive method products obtained therefrom, quality index reaches the top grade bright sulfur acidity scale standard of GB-T625-1989 regulation.
This device transforms washings and can use continuously more than one month, conversion separator column packing material can use more than three months continuously, back flushing regularly transforms separator column, changes conversion washings and conversion separator column packing material, but stable maintenance is handled the processing capacity of post.
Embodiment 2
Silica glass is handled column diameter 13cm, length overall 120cm.Wherein, transform the high 45cm of washing fluid column, injection contains the high price titanium of catalyzer and the acidic mixed catalyzed oxidation liquid of high price manganese; The high 75cm of oxidation adsorption filtration post, being filled with manganese system and titanium is the porous acid resisting material of oxygenant.The broken pipe of little quartz that the porous ceramic grain that filling is differed in size in silica glass absorption column diameter 10cm, the long 140cm, post, shape is various, quartz sand and 0.8-1cm are long.Post is handled in one air-breathing importing of general industry sulfuric acid processed, transform the washings column temperature behind about 6min and reach about 63 ℃, open circulation and absorb sour valve, high-purity female acid with 98% absorbs purified sulfur trioxide gas, absorption column is rapidly heated to 48 ℃, in absorbing sour circulation loop, add high purity water slowly then, sulfuric acid concentration is maintained between the 98%-99%.Can make 98.26% sulfuric acid through continuous operation, determination of quality index the results are shown in table 1 the 6th row.
By table the 6 column data as seen, the inventive method products obtained therefrom, quality index reaches the top grade bright sulfur acidity scale standard of GB-T625-1989 regulation.
This device transforms washings and can use continuously more than one month, conversion separator column packing material can use more than three months continuously, back flushing regularly transforms separator column, changes conversion washings and conversion separator column packing material, but stable maintenance is handled the processing capacity of post.
Embodiment 3
Silica glass is handled column diameter 15cm, length overall 80cm.Wherein, transform the high 30cm of washing fluid column, inject the acidic mixed catalyzed oxidation liquid of the high price titanium, high valence chrome and the high price manganese that contain catalyzer; The high 50cm of oxidation adsorption filtration post, being filled with manganese system, titanium system and vanadium is the porous acid resisting material of oxygenant.Porous ceramic grain and quartz sand that filling is differed in size in silica glass absorption column diameter 12cm, the long 80cm, post, shape is various.Post is handled in one air-breathing importing of general industry sulfuric acid processed, transform the washings column temperature behind about 6min and reach about 61 ℃, open circulation and absorb sour valve, high-purity female acid with 98% absorbs purified sulfur trioxide gas, absorption column is rapidly heated to 45 ℃, in absorbing sour circulation loop, add technology then slowly and determine the amount high purity water, sulfuric acid concentration is maintained between 98～99%.Can make 98.26% sulfuric acid through continuous operation, determination of quality index the results are shown in table 1 the 7th row.
By table the 7 column data as seen, the inventive method products obtained therefrom, quality index reaches the top grade bright sulfur acidity scale standard of GB-T625-1989 regulation.
This device transforms washings and can use continuously more than one month, conversion separator column packing material can use more than three months continuously, back flushing regularly transforms separator column, changes conversion washings and conversion separator column packing material, but stable maintenance is handled the processing capacity of post.
Table 1. embodiment product quality indicator detected result
Claims (3)
1. the high-purity sulphuric acid production method of a non-distilling, this method is made unstripped gas with the sulphur trioxide/sulfur dioxide mixture gas that produces in the general industry sulfuric acid production process after once transforming, produce high-purity sulphuric acid through catalyzed oxidation, washing, absorption, filtration and absorption process, the step of this method and device thereof are:
To begin production process behind the described unstripped gas injection processing post;
Described processing post is two sections compositions that are interconnected, and first section is equal inversion of phases washing section, and second section is out-phase conversion adsorption filtration section, and this is handled post and is communicated with absorption column;
After described unstripped gas injects and handles post, at first carry out the primary chemical physical treatment at equal inversion of phases washing section through the catalyzed oxidation washings, most of sulfurous gas is converted to sulphur trioxide, and the solia particle in the eccysis gas,
Transform the adsorption filtration section through degree of depth catalytic oxidation treatment and filtration in out-phase again, obtain high-purity sulfur trioxide gas,
This high-purity sulfur trioxide gas enters absorption column, and the high purity water absorption that is absorbed the circulation high-purity sulphuric acid in the post and constantly adds namely obtains the high-purity sulphuric acid product; Wherein,
Described processing post is vertical post, has double-layer structure, and lower floor is equal inversion of phases washing section, and filling has the conversion washings of catalyzed oxidation washing function; The upper strata is that out-phase transforms the adsorption filtration section, the solid particulate materials of filling tool catalyzed oxidation adsorption filtration function;
Described conversion washings is the high valence chrome acid solution, or high price mangaic acid solution, or high price metatitanic acid solution, or their two or more mixed solutions, this conversion washings becomes sulphur trioxide with Sulphur Dioxide, and solia particle and metal ion in the eccysis, separate raw materials gas;
Described solid particulate materials refers to be coated with the porous acid resisting material of the blending oxidizing agent of one or more combinations in chromium system or manganese system or titanium system or the vanadium system;
The porous acid resisting material that described out-phase transforms the adsorption filtration section is porous ceramic grain, quartz sand, silica glass particle;
The acid resisting material that loads in the described absorption column is porous ceramic grain, quartz sand, silica glass particle.
2. the high-purity sulphuric acid production method of non-distilling according to claim 1 is characterized in that, described processing post and absorption column are cylindrical, handles post and absorption column material and is made by silica glass and/or engineering plastics.
3. production method according to claim 2 is characterized in that, 5～20 centimetres of described processing column diameters, 50～200 centimetres of column lengths; 5～15 centimetres of absorption column diameters, 50～200 centimetres of column lengths.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4333917A (en) * | 1979-02-10 | 1982-06-08 | Metallgesellschaft Aktiengesellschaft | Process of producing sulfuric acid |
| CN1355132A (en) * | 2000-12-01 | 2002-06-26 | 余振耀 | Process for preparing sulfuric acid |
| CN1689968A (en) * | 2004-04-19 | 2005-11-02 | 上海京藤化工有限公司 | Production method of refined sulfuric acid and production equipment thereof |
| CN101905873A (en) * | 2010-07-29 | 2010-12-08 | 杨锐雄 | Energy-saving high efficiency step temperature difference distillation production method of high purity sulphuric acid |
-
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4333917A (en) * | 1979-02-10 | 1982-06-08 | Metallgesellschaft Aktiengesellschaft | Process of producing sulfuric acid |
| CN1355132A (en) * | 2000-12-01 | 2002-06-26 | 余振耀 | Process for preparing sulfuric acid |
| CN1689968A (en) * | 2004-04-19 | 2005-11-02 | 上海京藤化工有限公司 | Production method of refined sulfuric acid and production equipment thereof |
| CN101905873A (en) * | 2010-07-29 | 2010-12-08 | 杨锐雄 | Energy-saving high efficiency step temperature difference distillation production method of high purity sulphuric acid |
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