CN113321191A - Sulfuric acid concentration equipment - Google Patents
Sulfuric acid concentration equipment Download PDFInfo
- Publication number
- CN113321191A CN113321191A CN202010127283.1A CN202010127283A CN113321191A CN 113321191 A CN113321191 A CN 113321191A CN 202010127283 A CN202010127283 A CN 202010127283A CN 113321191 A CN113321191 A CN 113321191A
- Authority
- CN
- China
- Prior art keywords
- acid
- tube
- feed
- sulfuric acid
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000002253 acid Substances 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 239000000919 ceramic Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000010453 quartz Substances 0.000 claims abstract description 10
- 239000011521 glass Substances 0.000 claims abstract description 9
- 238000005485 electric heating Methods 0.000 claims abstract description 6
- 238000009833 condensation Methods 0.000 claims abstract description 3
- 230000005494 condensation Effects 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 18
- 239000000460 chlorine Substances 0.000 claims description 18
- 229910052801 chlorine Inorganic materials 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 17
- 238000012856 packing Methods 0.000 claims description 16
- 238000006386 neutralization reaction Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 12
- 235000011121 sodium hydroxide Nutrition 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000004094 preconcentration Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910000856 hastalloy Inorganic materials 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910019093 NaOCl Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229920001774 Perfluoroether Polymers 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910001902 chlorine oxide Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/88—Concentration of sulfuric acid
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a device for concentrating sulfuric acid. The apparatus comprises: feed line, rectifying column, at least one concentration unit, acid cooling and discharge means, condensation unit, product line, and vacuum system, characterized in that in each concentration unit there is at least one electric heating means, each heating means comprising a plurality of heating elements, each heating element being surrounded by a ceramic jacket, said heating elements being included in a glass tube for insulating the surrounding hot sulfuric acid, the quartz tube being closed at its bottom end.
Description
Technical Field
The invention relates to a plant for concentrating sulfuric acid, in particular for concentrating sulfuric acid from the drying of moist gases, such as chlorine from the electrolysis of aqueous NaCl solutions.
Background
Sulfuric acid is used in many processes as a dehydration desiccant to remove water from other liquids or gases. The spent acid needs to be concentrated before it can be reused in the process. Examples of drying with high concentrations of sulfuric acid are chlorine drying and chemical dehydration reactions, to name only two. Highly complex recovery equipment allows near 100% recovery.
The possibilities of releasing the spent acid into the environment are increasingly limited and expensive. The recovery of spent sulfuric acid avoids the high cost of waste and waste disposal. The recovered sulfuric acid can be completely recycled to the process from which it was derived.
Concentrated sulfuric acid is a highly corrosive liquid. The recycling equipment must take this into account and needs to be made of corrosion resistant materials. This applies in particular to devices which come into contact with hot concentrated sulfuric acid, such as, inter alia, pumps, heating elements, mixing devices and storage tanks.
Therefore, it is important to improve both the recovery process/conditions and the equipment to achieve extended life and reduced cost.
Disclosure of Invention
The invention relates to a plant for concentrating sulfuric acid, comprising: a feed line, a rectification column, at least one concentration unit, an acid cooling and discharge unit, a condensation unit, a product line with a product acid cooling system, and a vacuum system, wherein in each concentration unit there is at least one electric heating device, each heating device comprising a plurality of heating elements, each heating element comprising a heating wire surrounded by a ceramic jacket, the heating elements being comprised in a tube made of a suitable corrosion-resistant glass, preferably quartz glass, for insulating the surrounding hot sulfuric acid, the glass tube being closed at its bottom end.
The concentration plant comprises conventional units as used in many existing plants. Some of the units are modified as detailed below. These improvements may be used in the apparatus each individually, all together or in any combination.
Of most importance and particular interest is the design of one or more electrical heating devices used in the concentration unit. Electric heating devices are commonly used in installations where high pressure steam is not available and the necessary temperatures above 200 ℃ can only be reached by electric heating. Since the heating device is surrounded by hot high-concentration sulfuric acid, a specific design of the heating device is necessary.
According to the invention, there is at least one heating device in each concentration unit, each heating device consisting of a closed glass body, preferably made of quartz glass, and comprising one or more heating wires. The heating wire is positioned and fixed within a glass body with a ceramic sheath or insulator to ensure electrical insulation, while the heat radiation is provided by the heating wire and ceramic insulator to ensure adequate heat transfer to the sulfuric acid liquor. The insulator is made of a ceramic material.
The heating element is included in a glass tube immersed in the sulfuric acid to be heated. Quartz is particularly suitable for the transfer of thermal radiation, thus allowing an efficient heat transfer into the surrounding sulfuric acid. Of course, the tube has a closed bottom end, with electrical connections entering the tube at the top end of the tube.
Very preferably a quartz tube is used.
Preferably, the tube has a surrounding flange for support and better handling, the flange being located above the sulphuric acid level. Furthermore, the part of the tube not immersed in sulfuric acid comprises an insulating material, such as glass, stone or ceramic wool.
Another improvement relates to a rectification column in which the conventionally used ceramic packing is replaced by a packing made of a corrosion-resistant plastic material, preferably PFA (perfluoroalkoxy polymer). Conventional ceramic packing has proven to be prone to breakage, which affects the performance of the column and the pre-concentration unit. Requiring frequent replacement. Although the PFA filler is relatively expensive, the PFA filler has a much longer life, thus compensating for the higher cost. Frequent maintenance of the unit is avoided.
Furthermore, the rectification column has a newly developed support grid for the packing, which is made of ferrosilicon. This material is stronger and more stable than the traditionally used glass, ceramic or PTFE grids. Ferrosilicon is highly acid and temperature resistant.
At its top, the rectification column comprises a feed device for distributing the preheated feed acid over the packing. According to one aspect of the invention, the feed device is in the form of an acid-resistant tube comprising a large number of holes or openings for spraying the feed acid onto the packing of the rectification column. Suitable materials are quartz, ceramics and high alloy steels, preferably glass fibre reinforced PTFE. For an even distribution of the feed, the holes of the feed device are arranged at well-defined angles with respect to the vertical, for example at 0 °, ± 14 ° and ± 26 °.
According to another aspect of the invention, the apparatus includes a mixing device wherein the hot product acid is cooled by injecting it into the cold product acid before being passed to the heat exchanger for heat transfer with the feed acid. The mixing device is preferably an injection tube in which the hot product acid is mixed with and injected into the stream of cold product acid.
Although residence tanks are typically used to mix and cool the concentrated product acid at very high temperatures of about 200 ℃, the present invention utilizes mixing tubes to avoid such residence tanks. The residence tanks are expensive because they are made of highly corrosion resistant materials, mainly of enamelled steel.
The mixing tube mixes the cold product acid with the hot acid from the concentration unit so that the hot acid is fed into the center of the cold acid stream. This avoids thermal stresses. Permanent recycling allows the hot product acid to be cooled from about 200 ℃ to typically less than 70 ℃. As a result, all components downstream of the mixing tube, in particular the pump made of corrosion-resistant material (for example hastelloy), serve to transfer the product acid to the subsequent heat exchanger, without coming into contact with the hot acid, avoiding the residence tank.
Another improvement relates to the neutralization of corrosive compounds in the exhaust gas. Sulfuric acid from chlorine production plants always contains a certain amount of chlorine. Like sulfuric acid, chlorine is highly corrosive. It is therefore desirable to neutralize the chlorine gas released from the sulfuric acid during concentration.
Since the acid is used to dry the chlorine, it contains dissolved chlorine. During the acid concentration, chlorine gas is released. As a result, the vapor from the rectification column contains chlorine gas. Due to the high chlorine content, the vacuum pump downstream of the rectification column should be made of chlorine-resistant materials such as expensive titanium. To optimize the cost and life of the vacuum pump, a neutralization unit in the vapor line is preferred.
In order to neutralize the chlorine gas released in the acid recovery process, the vapor discharge line comprises a neutralization unit equipped with an injection device for injecting a dilute sodium hydroxide solution. The sodium hydroxide solution is injected in a controlled manner depending on the acid and/or chlorine content determined by analyzing the condensate of the vacuum pump downstream of the rectification column. The neutralization unit is designed as a scrubber.
In the neutralization unit, dilute sodium hydroxide solution and cold water are injected into the steam, which produces a scrubbing effect. The solution unit is mixed with cold water, which will further optimize the performance of the pump. The sodium hydroxide will react with the chlorine to form NaCl and NaOCl. Small amounts of chlorine and sodium hydroxide will remain, but in such low amounts that standard vacuum pumps made of steel, preferably stainless steel, can be used.
Drawings
The details of the invention are set forth in the accompanying drawings and the description relating thereto. In the drawings, there are shown
Figure 1 is a general schematic diagram of a sulfuric acid concentration plant,
figure 2 is a quartz tube used in a concentration unit,
figure 3 is a rectification column for a pre-concentration unit,
figure 4 is a mixing device for cooling the product acid,
FIG. 5 is a general schematic of an exhaust unit.
Detailed Description
Figure 1 is a general schematic diagram of a sulfuric acid concentration plant such as used in accordance with the present invention. Such a concentration plant is used, for example, in connection with a chlorine drying plant in a caustic soda production plant.
The rectification column 4, the horizontal evaporator 6, the concentration units 9 and 10 and the off- gas lines 7a and 7b are operated under vacuum, for example at a pressure of less than 100 mbar absolute, to ensure the removal of gases such as water and chlorine.
The concentration units 9 and 10 comprise heating elements 12 for additional heat transfer. This is necessary if there is no hot steam supply at temperatures exceeding 200 ℃. The heating element 12 preferably consists of a quartz glass tube comprising a heating rod. The quartz tube is immersed in sulfuric acid supplied from a horizontal evaporator 6. Details are given below.
Figure 2 shows a heating device for use in a concentration unit according to the invention. The quartz tube 12 comprises a plurality of electrical heating elements 13, four being shown, which are fed by the thyristor unit through an insulated feeder cable 14 a. The electric heating rod has a ceramic sheath 14b composed of a plurality of ceramic elements. The portion of the quartz tube 12 not immersed in the hot sulfuric acid is filled with an insulating material 14c to minimize heat loss. The distance elements 15 ensure the correct distance between the individual heating rods and also prevent short circuits. Heat is transferred to the sulfuric acid by radiation.
Fig. 3 shows a rectification column 4 with packing 5 of packing rings (made of a sulfuric acid resistant plastic material, preferably of PFA), an inlet 16 at the bottom for the exhaust gases from the horizontal evaporator 6, an inlet 17 for the exhaust gases from the concentration units 9 and 10 via line 7a, and an outlet 19 for the exhaust gases into line 7 b. The feed acid is fed through line 1 and perforated pipe 20 and sprayed onto packing ring packing 5 to flow downward in countercurrent to the feed from the exhaust gas in line 7a and the exhaust gas generated in horizontal evaporator 6. The porous tube 20 is constructed of a corrosion resistant material such as quartz glass, ceramic and high alloy steel, preferably glass fiber reinforced PTFE. The packing ring packing 5 is preferably composed of a plastic material such as PFA and is supported by a grid 21 made of a metal material, preferably ferrosilicon.
Fig. 4 shows a mixing device 22 arranged in the product line 3 to cool the product acid from the concentration units 9 and 10 to protect downstream equipment from contact with hot concentrated sulfuric acid. This allows the use of standard equipment, such as pumps made of corrosion resistant materials, such as Hastelloy (Hastelloy), and avoids a residence tank for cooling the product acid.
The mixing device 22 provides a cold concentrated sulfuric acid stream (arrow) from the cooling device 11 into which hot product acid from line 3 is injected. This provides an initial stream of hot product acid surrounded by cold product acid. Upon mixing, the temperature was reduced to below 70 ℃.
The mixing device 22 comprises the pipes of the hot acid line 3 and an inlet pipe 24 for cold concentrated acid, the pipe 24 leading to a wide pipe 25 surrounding the hot acid line 3. A semi-circular wall 28 at the inlet to the pipe 24 separates the flow of cold acid into an upward flow around the pipe 26 and a downward flow that further dilutes the product acid stream with cold acid. Longitudinal baffles 27 on the tubes 26 support the mixing and cooling process.
Fig. 4a is a cross-sectional view along line a-a' of fig. 4, showing the arrangement of the semicircular wall 28 and the longitudinal baffle 27 at the inlet of the inlet tube 26.
Fig. 5 shows a neutralization unit 28 with a waste gas line 7b from the rectification column 4, which on its way passes through condenser units 30a and 30 b. The condenser units 30a and 30b form a condensing system together with a tank 35 for collecting wastewater and condensate. The neutralization unit 28 serves as a scrubber for neutralizing the corrosive components of the flue gas by injecting dilute sodium hydroxide solution through line 32 and cold water through line 33. Chlorine reacts to form NaCl and NaOCl. The vacuum pump 31, which is arranged downstream of the neutralization unit, also provides vacuum to the evacuated units 4, 6, 9 and 10 of the apparatus together with the pump 34, so that the vacuum pump 31 is protected from corrosive gases, which allows the use of conventional materials for pumps other than, for example, titanium.
The amount of dilute NaOH injected via line 32 into the neutralization unit 28 is calculated from the measured chlorinate content in the condensate by established techniques. A feed pump (not shown) provides the correct volumetric flow.
Claims (14)
1. An apparatus for concentrating sulfuric acid comprising:
a feed line for feeding the liquid to the reaction chamber,
a rectifying tower is arranged in the tower body,
at least one concentration unit is arranged in the device,
an acid cooling and discharging device is arranged on the upper portion of the acid tank,
a condensing unit for condensing the condensed water in the water tank,
a product line, and
a vacuum system is arranged in the vacuum box,
characterized in that in each concentration unit there is at least one electric heating device, each heating device comprising a plurality of heating elements, each surrounded by a ceramic sheath, said heating elements being included in a glass tube for insulating the surrounding hot sulfuric acid, the quartz tube being closed at its bottom end.
2. The apparatus of claim 1, wherein the heating element is a wire embedded in a plurality of ceramic elements.
3. The apparatus of claim 1 or 2, wherein the quartz tube comprises an insulating material in a portion thereof protruding from a sulfuric acid level in the concentration unit.
4. The apparatus of claim 1, wherein the rectification column comprises packing made of PFA.
5. The apparatus of claim 4, wherein the rectifier comprises a packing support grid made of ferrosilicon.
6. The apparatus according to claim 4 or 5, wherein the rectification column comprises in its top part a feed pipe with evenly distributed holes for feed acid.
7. The apparatus of claim 6, wherein the feed tube is made of glass fiber reinforced PTFE.
8. The apparatus of claim 1 or 4, wherein the hot product acid is cooled in the mixing device from the cold product acid in a pre-cooling step before entering the heat exchanger for heat transfer to the feed acid.
9. The apparatus of claim 8, wherein the hot product acid is passed through an injection device for injection into the cold product acid.
10. The apparatus of claim 9, wherein the mixing device comprises a mixing tube inserted into a discharge tube for hot product acid and a feed tube for cold product acid, the feed line injecting cold product acid into the mixing tube and into the acid stream exiting from the mixing tube.
11. The apparatus according to claim 1, 4 or 8, comprising a vapour discharge line, wherein the discharge line is equipped with a neutralization unit comprising an injection device for injecting low concentration sodium hydroxide solution and cold water into the discharge vapour for neutralization.
12. The apparatus of claim 11, wherein the exhaust line comprises a vacuum pump.
13. The apparatus of claim 11 or 12, wherein the chlorine content in the exhaust vapor is neutralized in a controlled manner.
14. The apparatus according to claim 13, wherein the exhaust vapour condensation system is provided with a measuring device for determining the acid and/or chlorine content, the measurement being used as a basis for the controlled injection of the sodium hydroxide solution.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410372815.6A CN118267734A (en) | 2020-02-28 | 2020-02-28 | Sulfuric acid concentration equipment |
| CN202010127283.1A CN113321191B (en) | 2020-02-28 | 2020-02-28 | Sulfuric acid concentration equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127283.1A CN113321191B (en) | 2020-02-28 | 2020-02-28 | Sulfuric acid concentration equipment |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410372815.6A Division CN118267734A (en) | 2020-02-28 | 2020-02-28 | Sulfuric acid concentration equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113321191A true CN113321191A (en) | 2021-08-31 |
| CN113321191B CN113321191B (en) | 2024-04-16 |
Family
ID=77412574
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410372815.6A Pending CN118267734A (en) | 2020-02-28 | 2020-02-28 | Sulfuric acid concentration equipment |
| CN202010127283.1A Active CN113321191B (en) | 2020-02-28 | 2020-02-28 | Sulfuric acid concentration equipment |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410372815.6A Pending CN118267734A (en) | 2020-02-28 | 2020-02-28 | Sulfuric acid concentration equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN118267734A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115212598A (en) * | 2022-08-01 | 2022-10-21 | 辽阳环亚废酸再生科技有限公司 | Fractionating tower for pot type sulfuric acid concentration device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0891811A (en) * | 1994-07-22 | 1996-04-09 | Nippon Sanso Kk | Device for purifying waste sulfuric acid and method thereof |
| CN102344125A (en) * | 2010-08-05 | 2012-02-08 | 钱尉兵 | Technology for concentrating dilute sulfuric acid with multi-effect evaporation |
| CN107963616A (en) * | 2017-12-29 | 2018-04-27 | 无锡英罗唯森科技有限公司 | A kind of evaporator for sulphuric acid concentration |
| CN108358176A (en) * | 2018-05-15 | 2018-08-03 | 杭州东日节能技术有限公司 | A kind of dilute sulfuric acid vacuum concentrating apparatus and method |
| CN108726490A (en) * | 2017-04-20 | 2018-11-02 | 何庆勇 | A kind of Waste Sulfuric Acid extracting and concentrating technology using fume afterheat |
| CN209392757U (en) * | 2018-11-22 | 2019-09-17 | 乳源东阳光电化厂 | A kind of dilute sulfuric acid concentration purifying plant |
| CN210078872U (en) * | 2019-05-23 | 2020-02-18 | 胡平 | Dilute sulfuric acid concentration device |
-
2020
- 2020-02-28 CN CN202410372815.6A patent/CN118267734A/en active Pending
- 2020-02-28 CN CN202010127283.1A patent/CN113321191B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0891811A (en) * | 1994-07-22 | 1996-04-09 | Nippon Sanso Kk | Device for purifying waste sulfuric acid and method thereof |
| CN102344125A (en) * | 2010-08-05 | 2012-02-08 | 钱尉兵 | Technology for concentrating dilute sulfuric acid with multi-effect evaporation |
| CN108726490A (en) * | 2017-04-20 | 2018-11-02 | 何庆勇 | A kind of Waste Sulfuric Acid extracting and concentrating technology using fume afterheat |
| CN107963616A (en) * | 2017-12-29 | 2018-04-27 | 无锡英罗唯森科技有限公司 | A kind of evaporator for sulphuric acid concentration |
| CN108358176A (en) * | 2018-05-15 | 2018-08-03 | 杭州东日节能技术有限公司 | A kind of dilute sulfuric acid vacuum concentrating apparatus and method |
| CN209392757U (en) * | 2018-11-22 | 2019-09-17 | 乳源东阳光电化厂 | A kind of dilute sulfuric acid concentration purifying plant |
| CN210078872U (en) * | 2019-05-23 | 2020-02-18 | 胡平 | Dilute sulfuric acid concentration device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115212598A (en) * | 2022-08-01 | 2022-10-21 | 辽阳环亚废酸再生科技有限公司 | Fractionating tower for pot type sulfuric acid concentration device |
| CN115212598B (en) * | 2022-08-01 | 2024-02-23 | 辽阳环亚废酸再生科技有限公司 | Fractionating tower for pot-type sulfuric acid concentration device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118267734A (en) | 2024-07-02 |
| CN113321191B (en) | 2024-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4543244A (en) | Use of high silicon Cr Ni steel in H2 SO4 manufacture | |
| CN217418195U (en) | Electronic-grade sulfuric acid production device | |
| CN109642393B (en) | System and method for producing aqueous sulfuric acid solution | |
| CN113321191B (en) | Sulfuric acid concentration equipment | |
| CN109264687A (en) | A kind of phosphoric acid microwave flash distillation prepares the method and apparatus of polyphosphoric acid | |
| US2124729A (en) | Concentrating acid solutions | |
| CN114904287B (en) | Microwave heating tube type evaporator and process for concentrating fluorine-containing dilute sulfuric acid | |
| CN106621757B (en) | Chlorosilane analysis waste gas recovery treatment device and treatment method | |
| WO2023025372A1 (en) | Sulfuric acid concentration plant | |
| CN205933215U (en) | Hydrogen chloride drying device | |
| US5028396A (en) | Apparatus formed of high silicon chromium/nickel in steel in the manufacture of sulpheric acid | |
| CN204153760U (en) | A kind of waste hot steam waste-heat recovery device | |
| KR20080074022A (en) | Method and device for using reaction heat during the production of 1,2-dichlorethane | |
| CA1205614A (en) | Process and an apparatus for the preparation of sulfuric acid | |
| CN115636395A (en) | Method and equipment for producing bromine | |
| CN105692554A (en) | Method and equipment for producing high-concentration anhydrous hydrogen chloride methanol solution | |
| CN211169845U (en) | Pickling waste liquid treatment system and recovery plant | |
| CN103407973A (en) | Pyrite acid-preparing pre-drying self-condensation process | |
| CN219848217U (en) | Dilute sulfuric acid continuous purifying treatment device | |
| CN209392757U (en) | A kind of dilute sulfuric acid concentration purifying plant | |
| CN206553195U (en) | A kind of new and effective waste heat recovery device for sulphur-burning sulphuric acid system | |
| CN109437108A (en) | A kind of waste acidity recovery 26%-28% hydrogen chloride new process | |
| CN219585853U (en) | Waste treatment device | |
| CN205252583U (en) | Sulphuric acid steam condensate concentration tower | |
| CN107213663A (en) | The carbon disulfide rectifying column of condenser built in a kind of tower top band |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |